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Статті в журналах з теми "Microcapsule en suspension"

Автор: Grafiati

Опубліковано: 8 вересня 2022

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1

Xiao, Ke Feng, Zhi Hui Hao, Lei Lei Wang, and Xiu Guang Feng. "Optimization of Formulations of 1% Abamectin Microcapsule Suspensions with Properties of Biochemical Materials." Advanced Materials Research 643 (January 2013): 17–20. http://dx.doi.org/10.4028/www.scientific.net/amr.643.17.

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By orthogonal experiments, optimal formulation of 1% abamectin microcapsule suspensions was determined as follow: the proportion of abamectin microcapsule is 1%, NNO 5.0%, sodium dodecyl sulfate 3.0%, xanthan gum 0.3%, ethylene glycol 3%, and the remainder is water. The indicators of the formulation are all excellent: good dispersibility, suspension rate greater than 90%, cold storage and hot storage syneresis rates under 5%. The properties of biochemical materials were used in optimization. The optimal formulation provides an experimental basis for industrial production of abamectin microcapsule suspensions.

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2

Маляр, И. В., О. И. Гуслякова, Д. М. Митин та С. В. Стецюра. "Управляемая электрическим полем адсорбция микрокапсул при создании планарных структур". Письма в журнал технической физики 44, № 4 (2018): 9. http://dx.doi.org/10.21883/pjtf.2018.04.45633.17039.

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AbstractIt is found that an electric field applied parallel to a substrate surface influences the adsorption of positively charged core–shell microcapsules on glass substrates. As a result, the amount of microcapsules adsorbed near negative contact is up to 2 times larger than the one absorbed near positive contact. It is also found that small concentration (less than 0.2 M) of salt in microcapsule suspension decreases this effect, while an increase in the concentration to 0.45 M results in enhancement of the effect.

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3

Sugita, Purwantiningsih, Suminar Setiati Achmadi, and Yuyu Yundhana. "Perilaku Disolusi Ketoprofen Tersalut Gel Kitosan-Karboksimetilselulosa (CMC)." Jurnal Natur Indonesia 13, no. 1 (November 21, 2012): 21. http://dx.doi.org/10.31258/jnat.13.1.21-26.

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Study dissolution behaviour of ketoprofen through optimum chitosan-CMC microcapsule has been carried out. Into228.6 ml of 1.0% (w/v) chitosan solution in 1% (v/v) acetic acid, 38.1 ml of CMC solution was added with concentrationvariation of 0.075; 0.0875; and 0.10% (w/v). Afterwards, 7.62 mL of glu was added slowly under stirring, withconcentrations varied: 3; 4.5; and 6% (v/v). All mixtures were shaked for 20 minutes for homogenization. Into eachmicrocapsule mixture for ketoprofen, a solution of 2 g of ketoprofen in 250 mL of 96% ethanol was added. Everymixture was then added with 5 ml of 2% Tween-80 and stirred with magnetic stirrer for an hour at room temperature.Conversion of suspension into fine powders/granules (microcapsules) was done by using spray dryer. Thedissolution behaviour of optimum ketoprofen microcapsules were investigated in gastric and intestinal medium.Microcapsule morphology before and after dissolution as well as empty microcapsule (blank) were observed withSEM. Spray drying process had successfully coated ketoprofen in chitosan-CMC microcapsule. Optimization byusing Minitab Release 14 software showed that among the microcapsule compositions studied, CMC and glu of0.0925% (w/v) and 3.01% (v/v), respectively, optimum to coat ketoprofen at constant chitosan concentration 1.0%(w/v). Result of SEM morphology and In vitro dissolution profile showed that ketoprofen in chitosan-CMCmicrocapsule was relatively well than chitosan-guar gum microcapsule. Kinetically, dissolution of ketoprofen frommicrocapsule in intestinal pH condition was first order with release rate constant, k, of 7.285  10-4 % min-1 andrelease half-time, t1/2, of approximately 15 hours.

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4

Sugita, Purwantiningsih, Bambang Srijanto, Budi Arifin, and Ellin Vina Setyowati. "STABILITY OF KETOPROFEN COATED BY CHITOSAN-GUAR GUM GEL." Indonesian Journal of Chemistry 9, no. 3 (June 24, 2010): 391–97. http://dx.doi.org/10.22146/ijc.21504.

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The coating stability of ketoprofen by chitosan-guar gum gel has been studied. Into 228.6 mL of 1.75% (w/v) chitosan solution in 1% (v/v) acetic acid, 38.1 mL of guar gum (gg) solution was added with concentration variation of 0.35, 0.55, and 0.75% (w/v) for ketoprofen microcapsules, and stirred with magnetic stirrer until homogenous. Afterwards, 7.62 mL of glutaraldehyde (glu) was added slowly under stirring, with concentrations varied: 3, 3.5, and 4% (v/v). All mixtures were shaked for 20 min for homogenization. Into each microcapsule mixture for ketoprofen, a solution of 2 g of ketoprofen in 250 mL of 96% ethanol was added. Every mixture was then added with 5 mL of 2% Tween-80 and stirred with magnetic stirrer for an hour at room temperature. Conversion of suspension into fine powders/granules (microcapsules) was done by using spray dryer. Every microcapsule formula was packed into capsules, as much as 100 g per capsule. The capsules were contained in 100-mL dark bottles and the bottles were kept in climatic chamber at (40 ± 2) °C and RH (75 ± 5) % for 3 months. The microcapsule stabilities were tested chemically and physically. The result showed that formulation of ketoprofen preparation composed of 1.75% (w/v) chitosan, 0.35% (w/v) gg, and 3.50% (v/v) glu, was relatively the best, with ketoprofen percentage left in microcapsule after 3 months, degradation rate constant, and shelf life of 80.33%, 0.0351 % week-1, and 18.92 months, respectively. Reaction kinetic model for this formula followed Prout-Tompkins equation and the degradation of ketoprofen was seem to follow autocatalytic reaction mechanism controlled by the formation and growth of reaction core. Keywords: Ketoprofen, chitosan-guar gum gel

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5

Zheng, Yu, Xiaoming Li, Wenjie Zhang, Kuan Wang, Feng Han, Xiaoge Li, and Yuqiang Zhao. "Experimental Study of Phase Change Microcapsule Suspensions Applied in BIPV Construction." Sustainability 14, no. 17 (August 30, 2022): 10819. http://dx.doi.org/10.3390/su141710819.

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In this paper, a phase change microcapsule suspension MPCMS25 with a mass fraction of 10% was prepared with TH-ME25 as the phase change microcapsule particles and deionized water as the base fluid. The experimental benches of the Building Integrated Photovoltaic (BIPV) system and BIPV-MPCMS system were set up, and the comparative tests were carried out in Nanjing to study the optimization effect of phase change microcapsule suspension on the thermal and electrical properties of the BIPV system. The results show that MPCMS25 reduces the component temperature of the system by 8.8 °C and the backplane temperature by 11.1 °C. The optimization time of the component operating temperature and the backplane temperature is 9.5 h and 9.75 h, respectively. Delay appearance of peak module operating temperature by 114 min and peak backplane temperature by 125 min. In addition, the suspension can also improve the power conversion efficiency (PCE) of photovoltaic modules by 0~5%. After a simulation study on the energy consumption of a high-speed railway station, it is found that using the BIPV-MPCMS system as the building envelope can achieve an energy saving rate of about 8.5%.

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6

Ootaki, Y., K. Kamohara, D. J. Horvath, A. Massiello, L. A. R. Golding, B. Lukic, W. J. Weiss, O. Maruyama, and K. Fukamachi. "Hemolysis Evaluation of Centrifugal Pumps Using Microcapsule Suspension." International Journal of Artificial Organs 29, no. 12 (December 2006): 1185–89. http://dx.doi.org/10.1177/039139880602901212.

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7

Lu, Juan, Danhua Zhu, and Lanjuan Li. "Evaluation of hydromechanical and functional properties of diversion-type microcapsule-suspension bioreactor for bioartificial liver." International Journal of Artificial Organs 45, no. 3 (January 16, 2022): 309–21. http://dx.doi.org/10.1177/03913988211066502.

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Aim: To evaluate the performance of a diversion-type microcapsulesuspension fluidized bed bioreactor and a choanoid fluidized bed bioreactor as bioartificial liver support systems. Materials and methods: We evaluated the performance between the modified fluidized bed bioreactor based on diversion-type microcapsule suspension (DMFBB) and choanoid fluidized bed bioreactor (CFBB). The fluidization performance, fluidized height, bed expansion, and the mechanical stability and strength of microcapsule were determined. The viability, synthetic, metabolism, and apoptosis of microcapsulated HepLi5 cells were evaluated. Finally, samples were collected for measurement of alanine aminotransferase, total bilirubin, direct bilirubin, and albumin concentrations. Results: Uniform fluidization was established in both DMFBB and CFBB. The bed expansion, shear force, retention rate, swelling rate, and breakage rate of microcapsules differed significantly between two bioreactors over 3 days. The viability of microencapsulated HepLi5 cells and the activities of cytochrome P450 1A2 and 3A4 increased on each day in DMFBB compared to the control. The albumin and urea concentrations in the DMFBB displayed obvious improvements compared to the control. Caspase3/7 activities in the DMFBB decreased compared to those in the CFBB. At 24 h, the alanine aminotransferase concentration in the DMFBB declined significantly compared to the control. The total and direct bilirubin concentrations within plasma perfusion were decreased and albumin was increased in the DMFBB at 24 h than in the CFBB. Conclusion: The DMFBB shows a promising alternative bioreactor for use in bioartificial liver support systems for application of clinical practice.

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8

MARUYAMA, Osamu, Takashi YAMANE, Masahiro NISHIDA, Tatsuo TSUTSUI, Tomoaki JIKUYA, and Toru Masuzawa. "Microcapsule Suspension for Hemolysis Evaluation of Centrifugal Blood Pumps." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2002.14 (2002): 195–96. http://dx.doi.org/10.1299/jsmebio.2002.14.195.

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9

Samran, Samran, Dalimunthe Dalimunthe, Dalimunthe Dalimunthe, and Dalimunthe Dalimunthe. "THE FORMULATION OF DRY CURCUMA (CURCUMA XANTHORRHIZA ROXB.) EXTRACT MICROCAPSULES BY SPRAY WET MICROENCAPSULATION TECHNIQUES." Asian Journal of Pharmaceutical and Clinical Research 11, no. 3 (March 1, 2018): 226. http://dx.doi.org/10.22159/ajpcr.2018.v11i3.22608.

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Objective: Curcuma xanthorrhiza Roxb. was used as hereditary medicinal plant for prevention of liver dysfunction, gastrointestinal disease, fever, and hemorrhoid. Curcuma extract was easy to damage because the light exposure, change of pH, weather and a long period of storage time. The problem can be solved by coating the extract with spray wet microencapsulation (SWM) technique. SWM technique is a method of preparing microcapsules in which a solution, suspension, or emulsion with a charged matrix is sprayed into opposing solution. The aim of this research was to formulate the dry Curcuma extract with SWM technique using sodium alginate as matrix.Methods: Brown algae (Sargassum ilicifolium) was a main resource of alginate acid. It was isolated using HCl 5% to make alginate acid and sodium alginate that was obtained by adding Na2CO3 5% to alginate acid solution. The microencapsulation process of Curcuma extract was done by SWM technique. The formula of Curcuma extract microencapsulation was design into three formulas: F1, F2, and F3. Microcapsules of Curcuma extract were being characterized for color intensity, analysis of scanning electron microscope (SEM), compressibility index, flowing time, and determination of angle repose.Results: The results showed that the higher concentration of sodium alginate used, the dry Curcuma extract microcapsules produced better. Particle size of extract microcapsules of Curcuma extract microcapsules SEM from F1, F2, F3 was 20 μm whereas dry weight of extracted microcapsule of Curcuma grows with increasing concentration of sodium alginate: F1 (0.2%) 19.86±0.11 g, F2 (0.4%) 20.66±0.73, F3 (0.6%) 21.29±0.64. The flowing time of F1, F2, and F3 was 6.92±0.56, 7.42±0.50, and 8.05±0.54 s consecutively.Conclusions: Based on the analysis of the study result, it can be concluded that the raw materials of Curcuma extract can be made by SWM technique using sodium alginate isolated from brown algae, and the characterization of dry Curcuma extract microcapsule of the three formulas met the requirements of the pre-formulation tests for capsule dosage form.

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10

Kim, Sunyoung, Bo-Hyun Kim, Myongkeon Oh, Dong Hyuk Park, and Sunjong Lee. "Repeatable Crack Self-Healing by Photochemical [2 + 2] Cycloaddition of TCE-co-DCE Monomers Enclosed in Homopolymer Microcapsules." Polymers 11, no. 1 (January 9, 2019): 104. http://dx.doi.org/10.3390/polym11010104.

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Self-healing, an autonomous repairing process stimulated by damage, has recently attracted a great deal of attention in the field of medical and mechanical engineering as well as from scientists, due to its valuable potential applications. However, as the self-healing process is mediated by specific functional materials, practical applications have been limited. Here, we introduce a healable homopolymer microcapsule that can self-heal a crack or cleaved part through a photochemical [2 + 2] cycloaddition process. Microcapsules were prepared through photopolymerization and suspension polymerization, each containing 1,1,1-tris (cinnamoyloxymethyl) ethane (TCE) and 1,1-di (cinnamoyloxymethyl) ethane (DCE) monomers, which act as healing materials. TCE and DCE monomers were polymerized into poly (TCE-co-DCE) without a photoinitiator under illumination. The epoxy specimen embedded with microcapsules showed obvious healing performance during illumination after cracking. From the FT-IR spectra for each step of the healing process, the specimen could be repeatedly self-healed through the reversible process of cyclobutane cross-links to the original cinnamate and vice versa. This work shows an alternative approach using homopolymer microcapsules to accomplish the repeatable self-healing of a crack without interface discontinuity, which could be adopted as a healing substance in various paints.

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11

Li, Wantong, Kongshuang Zhao, Xiguang Chen, and Yang Li. "Dielectric Analysis of Microcapsule-Immobilized Composite Capsules Suspension: Substances Release." Langmuir 36, no. 4 (January 16, 2020): 966–71. http://dx.doi.org/10.1021/acs.langmuir.9b03539.

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12

Go, Nam Kyung, Jin Sil Lee, Shin Young Lee, and Won Hur. "Preparation and Characterization of Dense Suspension of Aloe Gel Microcapsule." Journal of the Society of Cosmetic Scientists of Korea 39, no. 1 (March 31, 2013): 47–54. http://dx.doi.org/10.15230/scsk.2013.39.1.047.

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13

MARUYAMA, Osamu, Takashi YAMANE, Masahiro NISHIDA, Ahmed AOUIDEF, Tatsuo TSUTSUI, Tomoaki JIKUYA, and Toru Masuzawa. "Hemolytic Properties Evaluation of Commercial Blood Pumps using Microcapsule Suspension." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2001.13 (2001): 138–39. http://dx.doi.org/10.1299/jsmebio.2001.13.138.

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14

MARUYAMA, Osamu, Takashi YAMANE, Masahiro NISHIDA, Tomio ONOGUCHI, Katsuhito YAMAGUCHI, Tatsuo TSUTSUI, Tomoaki JIKUYA, and Toru Masuzawa. "Microcapsule suspension with polyurethane membrane for hemolytic evaluation of artificial organs." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2003.15 (2003): 371–72. http://dx.doi.org/10.1299/jsmebio.2003.15.371.

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15

MARUYAMA, Osamu, Takashi YAMANE, Masahiro NISHIDA, Tatsuo TSUTSUI, Tomoaki JIKUYA, and Toru Masuzawa. "F-0722 Hemolytic Properties of Microcapsule Suspension using a Rotaional Shear Stressor." Proceedings of the JSME annual meeting VI.01.1 (2001): 101–2. http://dx.doi.org/10.1299/jsmemecjo.vi.01.1.0_101.

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16

Maruyama, O., T. Yamane, M. Nishida, A. Aouidef, T. Tsutsui, T. Jikuya, and T. Masuzawa. "FRACTURAL CHARACTERISTICS OF MICROCAPSULE SUSPENSION FOR HEMOLYSIS EVALUATION USING ROTATIONAL SHEAR STRESSER." ASAIO Journal 46, no. 2 (March 2000): 235. http://dx.doi.org/10.1097/00002480-200003000-00336.

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17

Maruyama, Osamu, Takashi Yamane, Masahiro Nishida, Ahmed Aouidef, Tatsuo Tsutsui, Tomoaki Jikuya, and Toru Masuzawa. "Fractural Characteristic Evaluation of a Microcapsule Suspension Using a Rotational Shear Stressor." ASAIO Journal 48, no. 4 (July 2002): 365–73. http://dx.doi.org/10.1097/00002480-200207000-00007.

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18

Maruyama, Osamu, Takashi Yamane, Naoki Tsunemoto, Masahiro Nishida, Tatsuo Tsutsui, and Tomoaki Jikuya. "A Preliminary Study of Microcapsule Suspension for Hemolysis Evaluation of Artificial Organs." Artificial Organs 23, no. 3 (March 1999): 274–79. http://dx.doi.org/10.1046/j.1525-1594.1999.06316.x.

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19

Huang, Yong, Yimin Xuan, and Qiang Li. "Experimental investigation on convective heat transfer of magnetic phase change microcapsule suspension." Applied Thermal Engineering 47 (December 2012): 10–17. http://dx.doi.org/10.1016/j.applthermaleng.2012.04.027.

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20

Shih, Yeng-Fong, Pei Tian Chen, Edwin M. Lau, and Liang Rong Hsu. "Thermally conductive microcapsule/high-density polyethylene composite for energy saving and storage." Modern Physics Letters B 35, no. 24 (July 23, 2021): 2150429. http://dx.doi.org/10.1142/s0217984921504297.

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Phase change material (PCM) is useful for the storage and release of latent heat. However, its ability to conduct has hindered its engineering application. This study prepares a novel microencapsulated phase change material (MEPCM) by suspension polymerization. To improve the adhesion between the shell and the inorganic additive, triethoxyvinylsilane was incorporated copolymerizing with methyl methacrylate. Thermally conductive nanographite particle was added. This MEPCM was then incorporated into high-density polyethylene (HDPE) to form a series of thermally conductive PCM microcapsules that approached sphere shapes with diameters less than 2 [Formula: see text]m. Thermal analysis showed that the thermal stability and heat resistance of the microcapsule were improved. The thermal conductivity of HDPE was increased by 39% to 0.6358 W/m[Formula: see text]K, and the surface resistivity was lowered to [Formula: see text]/sq after the addition of MEPCM. The temperature on the top of the composite tested was lower than pristine HDPE. This was close to the onset melting temperature of the MEPCM (38.5[Formula: see text]C), [Formula: see text] lower than pure HDPE. The reduction is a significant improvement in temperature regulation. This enables MEPCMs to store and release heat much more effectively, and can thus be applied to medical construction materials to meet the temperature requirements of COVID-19 patients.

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21

Uludag, Hasan, and Michael V. Sefton. "Metabolic Activity and Proliferation of Cho Cells in Hydroxyethyl Methacrylate-Methyl Methacrylate (Hema-Mma) Microcapsules." Cell Transplantation 2, no. 2 (March 1993): 175–82. http://dx.doi.org/10.1177/096368979300200210.

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To better understand encapsulated cell behaviour, Chinese Hamster Ovary (CHO) fibroblasts were encapsulated in HEMA-MMA microcapsules and short-term (<2 wks) proliferation and changes in metabolic activity were investigated in vitro. CHO cells were observed to undergo rapid proliferation in the first week following encapsulation after which a growth arrest was obtained at ~3500 cells/capsule. The cell growth was localized in aggregates in the capsule core, resulting in high local cell density but low cell density in the whole capsule interior (~107 cells/mL). The total metabolic activity, as determined by the MTT (3-14,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium) assay, within the microcapsules increased in the first week, with no significant change afterwards. A broad variation in metabolic activity among the individual capsules was obtained. Supplementing the cell suspension with 20% Ficoll 400 during the encapsulation process resulted in significantly higher morphological uniformity among the individual capsules (with reduced capsule wall thickness and eccentricity); however, this did not change the extent of heterogeneity in metabolic activity. We conclude that viability and proliferation ability (at least to a limited extent) of CHO cells are maintained in HEMA-MMA microcapsules. The local cell growth and subsequent growth arrest remain issues to be addressed in order to obtain better utilization of the microcapsule core volume. Alternatively, small diameter (<400 μm as opposed to the present ~750 μm diameter) capsules are necessary.

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22

Stavarache, Carmen, Mircea Vinatoru, and Timothy Mason. "Transport of Magnetic Polyelectrolyte Capsules in Various Environments." Coatings 12, no. 2 (February 15, 2022): 259. http://dx.doi.org/10.3390/coatings12020259.

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Microcapsules consisting of eleven layers of polyelectrolyte and one layer of iron oxide nanoparticles were fabricated. Two types of nanoparticles were inserted as one of the layers within the microcapsule’s walls: Fe2O3, ferric oxide, having a mean diameter (Ø) of 50 nm and superparamagnetic Fe3O4 having Ø 15 nm. The microcapsules were suspended in liquid environments at a concentration of 108 caps/mL. The suspensions were pumped through a tube over a permanent magnet, and the accumulation within a minute was more than 90% of the initial concentration. The design of the capsules, the amount of iron embedded in the microcapsule, and the viscosity of the transportation fluid had a rather small influence on the accumulation capacity. Magnetic microcapsules have broad applications from cancer treatment to molecular communication.

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23

Ootaki, Yoshio, Keiji Kamohara, David J. Horvath, Stephan Benephit, Leonard A. Golding, Osamu Maruyama, and Kiyotaka Fukamachi. "HEMOLYSIS EVALUATION OF CENTRIFUGAL PUMP USING MICROCAPSULE SUSPENSION, BOVINE BLOOD, AND HUMAN BLOOD." ASAIO Journal 51, no. 2 (March 2005): 43A. http://dx.doi.org/10.1097/00002480-200503000-00170.

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24

Liu, Feng Jiao, Zhong Zhu Qiu, and Shi Wei Chen. "The Current Situation and Prospects of the Stability of Microcapsule Phase-Change Suspension`s Manufacturing." Advanced Materials Research 1015 (August 2014): 299–302. http://dx.doi.org/10.4028/www.scientific.net/amr.1015.299.

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Several factors affecting the stability of microcapsules during its manufacturing process are introduced in this paper, mainly including the variety and dosage of adding additives, the stirring energy, the mass fraction, PH and temperature, carrier fluid and other factors on the physical stability. Then, this paper points out the future research direction.

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25

Ansari, Jawaad A., Refat Al-Shannaq, Jamal Kurdi, Shaheen A. Al-Muhtaseb, Charles A. Ikutegbe, and Mohammed M. Farid. "A Rapid Method for Low Temperature Microencapsulation of Phase Change Materials (PCMs) Using a Coiled Tube Ultraviolet Reactor." Energies 14, no. 23 (November 24, 2021): 7867. http://dx.doi.org/10.3390/en14237867.

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Microencapsulation of phase change materials (PCMs) remain a suitable option within building materials, as they contribute to the thermal mass and provide an energy buffer, an added benefit. This paper presents a novel method for the rapid fabrication of microencapsulated phase change materials (PCMs) at ambient conditions in a perfluoroalkoxy (PFA) coiled tube ultraviolet (UV) reactor. The objective of this study was to optimize key parameters such as the product yield and quality of the as-prepared microcapsules. Rubitherm® RT-21™ PCM was microencapsulated within shells of poly-methyl-methacrylate (PMMA) through a suspension emulsion polymerization approach, where the crosslinking of polymers was driven by UV radiations with an appropriate photoinitiator. The characteristics of the resulting PCM microcapsules were found to be affected by the volumetric flow rate of the emulsion inside the coiled tube reactor. Higher volumetric flow rates led to higher PCM contents and higher microencapsulation efficiency, resulting in an average particle size of 6.5 µm. Furthermore, the effect of curing time on the PCM microcapsule properties was investigated. The optimum encapsulation yield, conversion, efficiency and PCM content were observed after 10 min of polymerization time. The thermal analysis indicated that the developed process had an efficiency of 85.8%, and the capsules were characterized with excellent thermal properties. Compared to the conventional thermal microencapsulation processes, the use of a coiled tube UV reactor with an appropriate photoinitiator enables the encapsulation of heat-sensitive PCMs at ambient conditions, and reduces the microencapsulation time dramatically. As a result, this novel microencapsulation approach can lead to a wider scope of PCM encapsulation and enable rapid, continuous and potentially large-scale industrial production of PCM microcapsules with low energy consumption.

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26

Lu, Juan, Xiaoqian Zhang, Jianzhou Li, Liang Yu, Ermei Chen, Danhua Zhu, Yimin Zhang, and LanJuan Li. "A New Fluidized Bed Bioreactor Based on Diversion-Type Microcapsule Suspension for Bioartificial Liver Systems." PLOS ONE 11, no. 2 (February 3, 2016): e0147376. http://dx.doi.org/10.1371/journal.pone.0147376.

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27

Langdon, C. J., and A. E. DeBevoise. "Effect of microcapsule type on delivery of dietary protein to a marine suspension-feeder, the oysterCrassostrea gigas." Marine Biology 105, no. 3 (October 1990): 437–43. http://dx.doi.org/10.1007/bf01316315.

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Wu, Tong, Xialun Fang, Ying Yang, Wenyan Meng, Pengji Yao, Qin Liu, Bo Zhang, Feng Liu, Aihua Zou та Jiagao Cheng. "Eco-friendly Water-Based λ-Cyhalothrin Polydopamine Microcapsule Suspension with High Adhesion on Leaf for Reducing Pesticides Loss". Journal of Agricultural and Food Chemistry 68, № 45 (28 жовтня 2020): 12549–57. http://dx.doi.org/10.1021/acs.jafc.0c02245.

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29

Bux, Jaiyana, Mohamed S. Manga, Timothy N. Hunter, and Simon Biggs. "Manufacture of poly(methyl methacrylate) microspheres using membrane emulsification." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2072 (July 28, 2016): 20150134. http://dx.doi.org/10.1098/rsta.2015.0134.

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Анотація:

Accurate control of particle size at relatively narrow polydispersity remains a key challenge in the production of synthetic polymer particles at scale. A cross-flow membrane emulsification (XME) technique was used here in the preparation of poly(methyl methacrylate) microspheres at a 1–10 l h −1 scale, to demonstrate its application for such a manufacturing challenge. XME technology has previously been shown to provide good control over emulsion droplet sizes with careful choice of the operating conditions. We demonstrate here that, for an appropriate formulation, equivalent control can be gained for a precursor emulsion in a batch suspension polymerization process. We report here the influence of key parameters on the emulsification process; we also demonstrate the close correlation in size between the precursor emulsion and the final polymer particles. Two types of polymer particle were produced in this work: a solid microsphere and an oil-filled matrix microcapsule. This article is part of the themed issue ‘Soft interfacial materials: from fundamentals to formulation’.

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30

Zheng, Lin, Wei Zhang, and Fei Liang. "Experiment Study on Thermal Conductivity of Microcapsule Phase Change Suspension Applied to Solar Powered Air Conditioning Cold Storage System." Procedia Engineering 205 (2017): 1237–44. http://dx.doi.org/10.1016/j.proeng.2017.10.364.

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31

Šumiga, Šumiga, Ravnjak, and Boh Podgornik. "Antimicrobial Paper Coatings Containing Microencapsulated Cymbopogon citratus Oil." Coatings 9, no. 8 (July 25, 2019): 470. http://dx.doi.org/10.3390/coatings9080470.

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Essential oils are environmentally friendly candidates for antimicrobial smart packaging systems. Encapsulation is needed to reduce their volatility and achieve controlled release. Within this study, the essential oil of Cymbopogon citratus (citronella oil) was microencapsulated and applied in pressure-sensitive antimicrobial functional coatings on papers for secondary packaging. Two microencapsulation methods were used: complex coacervation of gelatine with carboxymethylcellulose or with gum arabic, and in situ polymerization of melamine-formaldehyde prepolymers with a polyacrylic acid modifier. Minimum inhibitory concentrations of citronella oil microcapsules were determined for Bacillus subtilis (B. subtilis), Escherichia coli (B. subtilis), Pseudomonas aeruginosa (P. aeruginosa) and Saccharomyces cerevisiae (S. cerevisiae). Microcapsule suspensions were coated on papers for flexible packaging, 2 and 30 g/m2, and mechanically activated in the weight pulling test. A novel method on agar plates in sealed Petri dishes was developed to evaluate the antimicrobial activity of released citronella vapours on E. coli and S. cerevisiae. The results showed that both microencapsulation methods were successful and resulted in a container type single-core microcapsules. In situ microcapsule suspensions had better paper coating properties and were selected for industrial settings. The antimicrobial activity of 2 g/m2 coatings was not detected; however, the antimicrobial activity of 30 g/m2 partially activated coated papers was confirmed. The product enabled a prolonged use with the gradual release of citronella oil at multiple exposures of functional papers to pressure, e.g., by a human hand during product handling.

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32

Munti Yuhana, Andreas Tambun, Widanarni Widanarni, and Usamah Afiff. "Field Experiment: Synbiotic Microcapsule Dietary Supplementation Improved the Health Status of the White Shrimp under the Challenge of Coinfection Diseases through Improvement the Beneficial Microbial Composition." Jurnal Akuakultur Indonesia 21, no. 2 (August 30, 2022): 125–32. http://dx.doi.org/10.19027/jai.21.2.125-132.

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This study aimed to evaluate the effectivity of microencapsulated synbiotic (MS), Bacillus sp. NP5 and mannan oligosaccharide (MOS) dietary in different feeding frequencies in Pacific white shrimp culture field experiment. The MS was administered as a feed supplementation to enhance the immunity for prevention against co-infection with WSSV (White Spot Syndrome Virus) and Vibrio harveyi. The synbiotic was microencapsulated by the spray dryer method. Shrimps were reared in the floating net cages in the pond. Treatments included the administration of MS at different frequencies i.e, daily (A), twice a week (B), once a week (C), and without MS supplementation (consisted of negative and positive controls) with a feeding rate of 6% of shrimp biomass (5 times a day). During the challenge trial, shrimps were removed and further reared in plastic tanks, for 7 days. The shrimps (except negative control treatment) were intramuscularly injected by WSSV filtrate at the infective dosage of 10-4 copies.ml-1. Twenty four hours after WSSV injection the shrimps were immersed in the water-containing cells suspension of V. harveyi at the cell’s population dosage of 106 CFU.ml-1. Immune responses were observed for 7 days after experimental infection. The shrimps that have been treated with daily MS supplementation (A) showed better immune responses i.e., total haemocyte counts, phenoloxidase, respiratory burst, and the lower pathogenic cells abundance in the intestine compared to other treatments groups.

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Lan, Dan, XinYu Xun, YaoDong Hu, NianZhen Li, ChaoWu Yang, XiaoSong Jiang, and YiPing Liu. "Research on the Effect of Pediococcus pentosaceus on Salmonella enteritidis-Infected Chicken." BioMed Research International 2020 (October 10, 2020): 1–10. http://dx.doi.org/10.1155/2020/6416451.

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Salmonella enteritidis can cause significant morbidity and mortality in humans and economic loss in the animal industry. Improving the innate immunity is an effective method to prevent S. enteritidis infection. Pediococcus pentosaceus is a Gram-positive coccus which had probiotics properties. Numerous previously published studies reported that probiotics were beneficial to gut microbiota by changing the intestinal flora structure and inhibiting the harmful microbial growth to enhance the innate immunity. We investigated the immunological effects of P. pentosaceus on Salmonella-infected chickens by the following experiment. A total of 120 broilers from AA line were fed and divided into 2 groups (treated and control groups) for the experiment from day 1. The control group was fed with the basic diet, while the treated group was fed with the basic diet adding P. pentosaceus microcapsule with the bacterial concentration of 1 g/kg in the feed and bacterial counts 2.5 × 10 9 CFU/g. All the birds were given with 0.5 ml of S. enteritidis bacterial suspension (109 CFU/ml) through oral cavity at day 9. The number of dead birds was recorded and used in the analysis. The bacterial culture method and quantitative real-time PCR analysis were used to evaluate the effects of P. pentosaceus on chickens infected with S. enteritidis and to ascertain the mechanism of the effect. The results showed that the P. pentosaceus could restrain the pathogenicity of S. enteritidis and reduce the death rate from 44.4% to 23.3%. The flora in the caecum exhibited “rising-declining” trends, and the gene (TLR4, MyD88, TRAF6 NF-κB, IFN-β, TNF-a, IL6, and IL8) expression pattern was different between the experimental and control group. P. pentosaceus as a probiotic may competitively inhibit the growth of S. enteritidis and control the inflammatory response through regulating the gene expression which involved in the toll-like receptor pathway and inflammation pathway.

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34

Xiao, Ke Feng, Zhi Wang, Lei Lei Wang, Bao Hua Zhang, and Xiu Guang Feng. "Screening of Additives for 1% Abamectin Microcapsules Suspension." Advanced Materials Research 641-642 (January 2013): 939–42. http://dx.doi.org/10.4028/www.scientific.net/amr.641-642.939.

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Suitable additives for 1% abamectin microcapsules suspension were screened in this paper. Results show that Sodium dodecyl sulfate and NNO are suitable wetting and dispersing agent, xanthan gum act better than other four reagents as thickener, and 3% ethylene glycol is better than glycerol as antifreeze. The determination of suitable additives lays a solid foundation for the preparation of 1% abamectin microcapsules suspension.

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35

Križaj, Dejan, and Borut Pečar. "Analysis of impedance measurements of a suspension of microcapsules using a variable length impedance measurement cell." Journal of Electrical Bioimpedance 3, no. 1 (July 23, 2019): 42–50. http://dx.doi.org/10.5617/jeb.215.

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Abstract Electrical impedance measurements of a suspension have to take into account the double layer impedance that results from a very thin charged layer formed at the electrode-electrolyte interface. A dedicated measuring cell that enables variation of the distance between the electrodes was developed to investigate the electrical properties of suspensions using two-electrode impedance measurements. By varying the distance between the electrodes it is possible to separate the double layer and the suspension impedance from the measured data. Electrical ‘lumped’ models have been developed from measured and extracted impedances. The error of non-inclusion of the double layer impedance has been analyzed. The error depends on the frequency of the measurement as well as the distance between the electrodes.

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36

Inozemtcev, Sergey, and Evgeniy Korolev. "Technological Features of Production Calcium-Alginate Microcapsules for Self-Healing Asphalt." MATEC Web of Conferences 251 (2018): 01008. http://dx.doi.org/10.1051/matecconf/201825101008.

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Анотація:

The effect of the formulation factors of calcium-alginate suspension preparation on the properties of calcium-alginate microcapsules was studied. The maximum useful volume of the reducing agent is set it was established, up to 93.8% of the total volume, in microcapsules, from the beating, to retain 2.31% sodium alginate and 10.5% reducing agent. The proposed mechanism for the formation of calcium-alginate capsules, which occurs due to shrinkage during the drying of a single drop of suspension, breaking the emulsion and forming an integral shell with a nucleus from the reducing agent.

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37

Dhand, Abhishek P., Ryan Poling-Skutvik, and Chinedum O. Osuji. "Simple production of cellulose nanofibril microcapsules and the rheology of their suspensions." Soft Matter 17, no. 17 (2021): 4517–24. http://dx.doi.org/10.1039/d1sm00225b.

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38

Boubehziz, Toufik, Carlos Quesada-Granja, Claire Dupont, Pierre Villon, Florian De Vuyst, and Anne-Virginie Salsac. "A Data-Driven Space-Time-Parameter Reduced-Order Model with Manifold Learning for Coupled Problems: Application to Deformable Capsules Flowing in Microchannels." Entropy 23, no. 9 (September 9, 2021): 1193. http://dx.doi.org/10.3390/e23091193.

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Анотація:

An innovative data-driven model-order reduction technique is proposed to model dilute micrometric or nanometric suspensions of microcapsules, i.e., microdrops protected in a thin hyperelastic membrane, which are used in Healthcare as innovative drug vehicles. We consider a microcapsule flowing in a similar-size microfluidic channel and vary systematically the governing parameter, namely the capillary number, ratio of the viscous to elastic forces, and the confinement ratio, ratio of the capsule to tube size. The resulting space-time-parameter problem is solved using two global POD reduced bases, determined in the offline stage for the space and parameter variables, respectively. A suitable low-order spatial reduced basis is then computed in the online stage for any new parameter instance. The time evolution of the capsule dynamics is achieved by identifying the nonlinear low-order manifold of the reduced variables; for that, a point cloud of reduced data is computed and a diffuse approximation method is used. Numerical comparisons between the full-order fluid-structure interaction model and the reduced-order one confirm both accuracy and stability of the reduction technique over the whole admissible parameter domain. We believe that such an approach can be applied to a broad range of coupled problems especially involving quasistatic models of structural mechanics.

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39

Caruso, Mary M., Stuart R. Schelkopf, Aaron C. Jackson, Alexandra M. Landry, Paul V. Braun, and Jeffrey S. Moore. "Microcapsules containing suspensions of carbon nanotubes." Journal of Materials Chemistry 19, no. 34 (2009): 6093. http://dx.doi.org/10.1039/b910673a.

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40

Chen, Shu Ying, Zhi Cheng Sun, and Lu Hai Li. "Preparation and Characterization of Thermally Expandable Microspheres." Materials Science Forum 852 (April 2016): 596–600. http://dx.doi.org/10.4028/www.scientific.net/msf.852.596.

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The thermally expandable microspheres were prepared through suspension polymerization with acrylonitrile (AN), methyl methacrylate (MMA) and methyl acrylate (MA) as monomers. The experimental results showed that it was possible to apply suspension polymerization to prepare the high foaming ratio and equally distributed microcapsules when water and oil phase volume ratio of 3:1, AN-MMA-MA in the proportion of 70%/20%/10% (m/m/m), and 1,4-butanediol dimethacrylate (BDDMA) as the crosslinking agents. Furthermore, the structure and property of shell and nuclear were characterized by Infrared Spectra (IR), Scanning Electron Microscopy (SEM) and Thermal analysis (TG, DTG). The structure characteristics and effective factors of copolymer coated core materials, morphologies, particle sizes, foaming temperature and ratio of microcapsules were investigated in this paper.

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41

MARUYAMA, Osamu, Takashi YAMANE, Masahiro NISHIDA, Tomio ONOGUCHI, Tatsuo TSUTSUI, Tomoaki JIKUYA, and Toru MASUZAWA. "Microcapsule Suspensions for the Evaluation of Hemolytic Properties." Proceedings of the JSME annual meeting 2002.1 (2002): 117–18. http://dx.doi.org/10.1299/jsmemecjo.2002.1.0_117.

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42

Chen, He, Donglin Ma, Yichao Li, Yu Liu, and Ye Wang. "Optimization the Process of Microencapsulation of Bifidobacterium bifidum BB01 by Box-Behnken Design." Acta Universitatis Cibiniensis. Series E: Food Technology 20, no. 2 (December 1, 2016): 17–28. http://dx.doi.org/10.1515/aucft-2016-0012.

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Abstract The effects of cell suspension-alginate ratios, sodium erythorbate, and inulin on encapsulation yield of microcapsules of Bifidobacterium bifidum BB01 were studied by Box-Behnken design. The experimental results indicated that cell suspension-alginate ratios, sodium erythorbate and inulin had a significant impact on encapsulation yield, and the embedding yield could be enhanced significantly in the condition of 1:3 cell suspension-alginate ratios, 0.12% sodium erythorbate, and 6% inulin. The optimal embedding yields of microencapsulation of B. bifidum BB01 were observed to be 81.52%, that values were very close to the expected values 81.81%, so the method was effective.

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43

Ricardo, Fabián, Diego Pradilla, Ricardo Luiz, and Oscar Alberto Alvarez Solano. "A Multi-Scale Approach to Microencapsulation by Interfacial Polymerization." Polymers 13, no. 4 (February 22, 2021): 644. http://dx.doi.org/10.3390/polym13040644.

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This work applies a multi-scale approach to the microencapsulation by interfacial polymerization. Such microencapsulation is used to produce fertilizers, pesticides and drugs. In this study, variations at three different scales (molecular, microscopic and macroscopic) of product design (i.e., product variables, process variables and properties) are considered simultaneously. We quantify the effect of the formulation, composition and pH change on the microcapsules’ properties. Additionally, the method of measuring the strength of the microcapsules by crushing a sample of microcapsules’ suspension was tested. Results show that the xylene release rate in the microcapsules decreases when the amine functionality is greater due to a stronger crosslinking. Such degree of crosslinking increases the compression force over the microcapsules and improves their appearance. When high levels of amine concentration are used, the initial pH values in the reaction are also high which leads to agglomeration. This study provides a possible explanation to the aggregation based on the kinetic and thermodynamic controls in reactions and shows that the pH measurements account for the polyurea reaction and carbamate formation, which is a reason why this is not a suitable method to study kinetics of polymerization. Finally, the method used to measure the compressive strength of the microcapsules detected differences in formulations and composition with low sensibility.

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44

Wong, H., and T. M. S. Chang. "Bioartificial Liver: Implanted Artificial Cells Microencapsulated Living Hepatocytes Increases Survival of Liver Failure Rats." International Journal of Artificial Organs 9, no. 5 (September 1986): 335–36. http://dx.doi.org/10.1177/039139888600900515.

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Suspension of living hepatocytes were microencapsulated inside 300 micron mean diameter alginate artificial cells. The galactosamine fulminant hepatic failure rat model was used. 48 hours after the injection of galactosamine, grade II coma hepatic failure rats were divided into pairs. One of the pair was randomly chosen for the control group, and the other for the treated group. Each rat in the control group received one peritoneal injection of microcapsules containing no hepatocytes. Each rat in the treated group received one peritoneal injection of microcapsules containing hepatocytes. The survival of the treated group is significantly higher than the control group.

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45

Dobashi, Toshiaki, Mikihito Takenaka, Feng-ji Yeh, Guangwei Wu, Kimio Ichikawa, and Benjamin Chu. "Scattering Studies of Poly(urea-urethane) Microcapsules in Suspension." Journal of Colloid and Interface Science 179, no. 2 (May 1996): 640–42. http://dx.doi.org/10.1006/jcis.1996.0262.

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46

Tabe, Yasuhiro, Mitsuhiro Hibino, and Takeshi Yao. "Fabrication of Hydroxyapatite Microcapsules by Biomimetic Method." Key Engineering Materials 330-332 (February 2007): 1029–32. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.1029.

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Apatite nuclei were synthesized by raising pH of simulated body fluid (SBF). Poly (lactic acid) (PLA) microspheres were soaked in apatite nuclei suspension, and then apatite nuclei were attached to surfaces of the PLA microspheres. When these PLA microspheres were soaked in SBF, apatite nuclei on the PLA microspheres induced HAp. As a result, PLA microspheres coated with HAp were fabricated. The HAp-coated PLA microspheres were soaked in acetone. The PLA core was dissolved out, and then consequently hollow microcapsules constructed of HAp were fabricated. As HAp microcapsules have properties of bioaffinity and non-toxicity, they were expected to be applicable to an excellent carrier of drug delivery system.

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47

Sovilj, Verica, Jadranka Milanovic, Jaroslav Katona, and Lidija Petrovic. "Preparation of microcapsules containing different contents of different kinds of oils by a segregative coacervation method and their characterization." Journal of the Serbian Chemical Society 75, no. 5 (2010): 615–27. http://dx.doi.org/10.2298/jsc091008042s.

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Microencapsulation of different oils was performed using a segregative coacervation method. In order to microencapsulate, 20% oilin-water (O/W) emulsions were prepared in a continuous phase consisting of a 1% mixture of hydroxypropylmethyl cellulose (HPMC)/sodium carboxymethylcellulose (NaCMC) mass ratio (0.7/0.3) and various concentrations (0%, 0.35% and 1%) of the anionic surfactant sodium dodecylsulfate (SDS). Various interactions between the components occur in the continuous phase of emulsions, which influence the structure and properties of the adsorption layer around the oil droplets. The formed HPMC/SDS complexes in the presence of NaCMC molecules undergo segregative phase separation and form a coacervate which adsorbs onto the oil droplets, forming the wall of the microcapsules. Sunflower oil, pumpkin seed oil and a mixture of sunflower and linseed oil were used as the core material. Microcapsules in the solid form were obtained by spray drying the emulsions. The stability of the emulsions, the particle size and particle size distribution of the emulsions and suspensions of microcapsules and the oil content of the microcapsules were determined. The influence of the oil kind on the properties of the microcapsules was also investigated. It was found that at 0.35 % SDS, a coacervate layer around the oil droplets forms a stabile, compact microcapsules wall, which prevents oil extraction. The kind of oil influences the properties of the emulsions and microcapsules, which is important in the selection of oils for microencapsulation by this method.

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48

Hu, J., Z. Zheng, F. Wang, W. Tu, and L. Lin. "Synthesis and characterisation of thermally expandable microcapsules by suspension polymerisation." Pigment & Resin Technology 38, no. 5 (September 11, 2009): 280–84. http://dx.doi.org/10.1108/03699420910988732.

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49

Brujes, Luis, Jack Legrand, and Gérard Carnelle. "Complete Suspension of Microcapsules in Baffled and Unbaffled Stirred Tanks." Chemical Engineering & Technology 21, no. 9 (September 1998): 735–44. http://dx.doi.org/10.1002/(sici)1521-4125(199809)21:9<735::aid-ceat735>3.0.co;2-u.

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50

Kochetkova, Olga Yu, Tatiana S. Demina, and Olga Yu Antonova. "Universal Microcarriers Based on Natural and Synthetic Polymers for Co-Delivery of Hydrophilic and Hydrophobic Compounds." Polymers 14, no. 5 (February 25, 2022): 931. http://dx.doi.org/10.3390/polym14050931.

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Several variants of hybrid polyelectrolyte microcapsules (hPEMC) were designed and produced by modifying in situ gelation methods and layer-by-layer (LbL) techniques. All of the hPEMC designs tested in the study demonstrated high efficiency of the model hydrophilic compound loading into the carrier cavity. In addition, the microcarriers were characterized by high efficiency of incorporating the model hydrophobic compound rhodamine B isothiocyanate (RBITC) into the hydrophobic layer consisting of poly-(d,l)-lactide-co-glycolide (PLGA), oligo-(l)-lactide (OLL), oligo-(d)-lactide (OLD) and chitosan/gelatin/poly-l-lactide copolymer (CGP). The obtained microcapsules exhibited high storage stability regardless of the composition and thickness of the polyelectrolyte shell. Study of the impact of hybrid polyelectrolyte microcapsules on viability of the adhesive L929 and suspension HL-60 cell lines revealed no apparent toxic effects of hPEMC of different architecture on live cells. Interaction of hPEMC with peritoneal macrophages for the course of 48 h resulted in partial deformation and degradation of microcapsules accompanied by release of the content of their hydrophilic (BSA–fluorescein isothiocyanate conjugate (BSA-FITC)) and hydrophobic (RBITC) layer. Our results demonstrate the functional efficiency of novel hybrid microcarriers and their potential for joint delivery of drugs with different physico-chemical properties in complex therapy.

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