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Articles de revues sur le sujet « Photo-induced crosslinking »

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Auteur : Grafiati
Publié le 14 mars 2023

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1

Wang, Gang, Xiaodong Cao, Hua Dong, Lei Zeng, Chenxi Yu et Xiaofeng Chen. « A Hyaluronic Acid Based Injectable Hydrogel Formed via Photo-Crosslinking Reaction and Thermal-Induced Diels-Alder Reaction for Cartilage Tissue Engineering ». Polymers 10, no 9 (27 août 2018) : 949. http://dx.doi.org/10.3390/polym10090949.

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A hyaluronic acid (HA) based injectable hydrogel with gradually increasing mechanical properties was synthesized via photo-crosslinking reaction and thermal-induced Diels-Alder (DA) reaction. The injectable hydrogel can quickly gelate within 30 s by photo-crosslinking of HA-furan under the catalysis of lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP). This injectable property is beneficial to keep the encapsulated cell activity and convenient for clinical operation. And the mechanical properties can be control from 4.86 to 10.66 kPa by exposure time. Then, the thermal-induced DA click chemistry further occurs between furan groups and maleimide groups which gradually promoted the crosslinking density of the injectable hydrogel. The mechanical properties of the injectable hydrogel can be promoted to 21 kPa. ATDC-5 cells were successfully encapsulated in the injectable hydrogel and showed good activity. All the results suggested that the injectable hydrogel with gradually increasing mechanical properties formed by photo-crosslinking reaction and thermal-induced DA reaction has a good prospect of application in cartilage tissue engineering.
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Kang, Yeyoung, Jae Hak Kim, Seo Young Kim, Won-Gun Koh et Hyun Jong Lee. « Blue Light-Activated Riboflavin Phosphate Promotes Collagen Crosslinking to Modify the Properties of Connective Tissues ». Materials 14, no 19 (3 octobre 2021) : 5788. http://dx.doi.org/10.3390/ma14195788.

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Reduced amounts of collagen and fragmented collagen fibers are characteristics of aging skin. Recently, user-friendly, at-home personal aesthetic devices using light-emitting diode (LED) light have been used for cost-effective and safe skin improvement. However, to dramatically improve the skin via collagen repair, we need to develop an LED-responsive photosensitizer. Corneal collagen crosslinking uses ultraviolet light to activate riboflavin phosphate (RFP) and is used in ophthalmology. RFP is a biocompatible photosensitizer derived from vitamin B2. This study aimed to prove that RFP combined with blue light (BL) can increase collagen crosslinking density, improving its mechanical properties in skin tissue and enhancing skin elasticity. We confirmed the RFP-induced photo-crosslinking in pure collagen by studying changes in its dynamic modulus and matrix morphology using collagen hydrogels. We also measured the changes in the mechanical properties after applying photo-crosslinking on porcine skin. The Young’s modulus (1.07 ± 0.12 MPa) and tensile strength (11.04 ± 1.06 MPa) of the porcine skin after photo-crosslinking were 2.8 and 3.5 times better compared to those of normal porcine skin, respectively. Thus, photo-crosslinking through RFP and BL irradiation can be potentially used for skin improvement using aesthetic LED devices.
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Radl, Simone Viola, Meinhart Roth, Martina Gassner, Archim Wolfberger, Andreas Lang, Benjamin Hirschmann, Gregor Trimmel, Wolfgang Kern et Thomas Griesser. « Photo-induced crosslinking and thermal de-crosslinking in polynorbornenes bearing pendant anthracene groups ». European Polymer Journal 52 (mars 2014) : 98–104. http://dx.doi.org/10.1016/j.eurpolymj.2013.10.024.

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Piening, Niklas, Petra Weber, Tobias Högen, Michael Beekes, Hans Kretzschmar et Armin Giese. « Photo-induced crosslinking of prion protein oligomers and prions ». Amyloid 13, no 2 (janvier 2006) : 67–77. http://dx.doi.org/10.1080/13506120600722498.

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Croutxé-Barghorn, C., O. Soppera et D. J. Lougnot. « Fabrication of microlenses by direct photo-induced crosslinking polymerization ». Applied Surface Science 168, no 1-4 (décembre 2000) : 89–91. http://dx.doi.org/10.1016/s0169-4332(00)00597-3.

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Craig, I. H., J. R. White, A. V. Shyichuk et I. Syrotynska. « Photo-induced scission and crosslinking in LDPE, LLDPE, and HDPE ». Polymer Engineering & ; Science 45, no 4 (2005) : 579–87. http://dx.doi.org/10.1002/pen.20313.

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Bilici, Çiğdem, Asena G. Tatar, Efsun Şentürk, Caner Dikyol et Bahattin Koç. « Bisulfite-initiated crosslinking of gelatin methacryloyl hydrogels for embedded 3D bioprinting ». Biofabrication 14, no 2 (9 février 2022) : 025011. http://dx.doi.org/10.1088/1758-5090/ac4dd9.

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Abstract Recent studies on three-dimensional (3D) bioprinting of cell-laden gelatin methacryloyl (GelMA) hydrogels have provided promising outcomes for tissue engineering applications. However, the reliance on the use of photo-induced gelation processes for the bioprinting of GelMA and the lack of an alternative crosslinking process remain major challenges for the fabrication of cell-laden structures. Here, we present a novel crosslinking approach to form cell-laden GelMA hydrogel constructs through 3D embedded bioprinting without using any external irradiation that could drastically affect cell viability and functionality. This approach consists of a one-step type of crosslinking via bisulfite-initiated radical polymerization, which is combined with embedded bioprinting technology to improve the structural complexity of printed structures. By this means, complex-shaped hydrogel bio-structures with cell viability higher than 90% were successfully printed within a support bath including sodium bisulfite. This study offers an important alternative to other photo-induced gelation processes to improve the bio-fabrication of GelMA hydrogel with high cell viability.
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Jamaluddin, Jamarosliza, et Myung Cheon Lee. « Curing Properties of UV-Cured Pressure Sensitive Adhesives ». Advanced Materials Research 812 (septembre 2013) : 131–37. http://dx.doi.org/10.4028/www.scientific.net/amr.812.131.

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In this study the effect of trimethylopropane triacrylate (TMPTA) content as a crosslinking agent on curing properties of UV-cured pressure sensitive adhesives (PSAs) was investigated. The curing properties were studied using gel fraction determination, photo-differential scanning calorimetry (photo-DSC) and Fourier transform infraredattenuated total reflection (FTIR-ATR) spectroscopy. Gel fraction sharply increased after expose to UV irradiation and increased with increasing TMPTA content. Moreover, the addition of TMPTA as crosslinking agent induced an earlier onset of auto acceleration and relative concentration of the C=C was not zero because they were trapped in the PSAs network.
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Shin, Dong Myung. « The Surface Morphology Effects on Liquid Crystal Alignment After Photo-Agitation and Crosslinking of Polyimide ». Journal of Nanoscience and Nanotechnology 20, no 8 (1 août 2020) : 5112–16. http://dx.doi.org/10.1166/jnn.2020.17848.

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The photo-reactive activators are highly reactive radical generators upon the ultraviolet (UV) light illumination. The photo-reactive initiators produced nitrogen radical and alkyl radical after releasing carbon dioxide. The radicals could react with polyimide (PI) main chains. These reactions enforced the alignment layers and exhibited high azimuthal anchoring energy. The thickness of photo-irradiated PI alignment layers were reduced dramatically by photo-induced crosslinking, which induced surface wrinkling and roughness. The carbon dioxide gases released from the thin films produced many micro-pores, which provides tight anchoring of liquid crystal (LC) molecules. The azimuthal anchoring energy obtain by photo-alignment was better than that obtain by rubbing method with the same PI. The maximum value was 6.92×10−5 J/m2. Small aliphatic hydrocarbons, such as methane and propene, were released during photo-decomposition reaction from the PI surface. The polarity of film surface became more hydrophilic. The photo-alignment of LC was perpendicular to the polarization axis of UV light. On the basis of high anchoring energy, the rough surface, hydrophilic surface, and rapid photo-reactions, the photo-alignment mechanism is proposed.
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Zeng, Jun, Haoqing Hou, Joachim H. Wendorff et Andreas Greiner. « Photo-Induced Solid-State Crosslinking of Electrospun Poly(vinyl alcohol) Fibers ». Macromolecular Rapid Communications 26, no 19 (6 octobre 2005) : 1557–62. http://dx.doi.org/10.1002/marc.200500545.

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Jiang, A., et G. R. Hamed. « Photo-induced crosslinking of ethylene propylene diene monomer (EPDM) by buckminsterfullerene ». Polymer Bulletin 40, no 4-5 (16 avril 1998) : 499–502. http://dx.doi.org/10.1007/s002890050282.

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Jayachandran, Brindha, Thansila N. Parvin, M. Mujahid Alam, Kaushik Chanda et Balamurali MM. « Insights on Chemical Crosslinking Strategies for Proteins ». Molecules 27, no 23 (22 novembre 2022) : 8124. http://dx.doi.org/10.3390/molecules27238124.

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Crosslinking of proteins has gained immense significance in the fabrication of biomaterials for various health care applications. Various novel chemical-based strategies are being continuously developed for intra-/inter-molecular crosslinking of proteins to create a network/matrix with desired mechanical/functional properties without imparting toxicity to the host system. Many materials that are used in biomedical and food packaging industries are prepared by chemical means of crosslinking the proteins, besides the physical or enzymatic means of crosslinking. Such chemical methods utilize the chemical compounds or crosslinkers available from natural sources or synthetically generated with the ability to form covalent/non-covalent bonds with proteins. Such linkages are possible with chemicals like carbodiimides/epoxides, while photo-induced novel chemical crosslinkers are also available. In this review, we have discussed different protein crosslinking strategies under chemical methods, along with the corresponding crosslinking reactions/conditions, material properties and significant applications.
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Cao, Cheng Bo, Chen Zhou, Xun Sun, Jian Ping Gao et Zhi Yuan Wang. « Photo-induced crosslinking of water-soluble polymers with a new photobase generator ». Polymer 51, no 18 (août 2010) : 4058–62. http://dx.doi.org/10.1016/j.polymer.2010.06.052.

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Kumar, Annamalai Pratheep, et Raj Pal Singh. « Biocomposites of cellulose reinforced starch : Improvement of properties by photo-induced crosslinking ». Bioresource Technology 99, no 18 (décembre 2008) : 8803–9. http://dx.doi.org/10.1016/j.biortech.2008.04.045.

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Zou, Yang, Yuye Zhong, Houbin Li, Fuyuan Ding et Xiaowen Shi. « Electrodeposition of Polysaccharide and Protein Hydrogels for Biomedical Applications ». Current Medicinal Chemistry 27, no 16 (4 juin 2020) : 2610–30. http://dx.doi.org/10.2174/0929867326666191212163955.

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In the last few decades, polysaccharide and protein hydrogels have attracted significant attentions and been applied in various engineering fields. Polysaccharide and protein hydrogels with appealing physical and biological features have been produced to meet different biomedical applications for their excellent properties related to biodegradability, biocompatibility, nontoxicity, and stimuli responsiveness. Numerous methods, such as chemical crosslinking, photo crosslinking, graft polymerization, hydrophobic interaction, polyelectrolyte complexation and electrodeposition have been employed to prepare polysaccharide and protein hydrogels. Electrodeposition is a facile way to produce different polysaccharide and protein hydrogels with the advantages of temporal and spatial controllability. This paper reviews the recent progress in the electrodeposition of different polysaccharide and protein hydrogels. The strategies of pH induced assembly, Ca2+ crosslinking, metal ions induced assembly, oxidation induced assembly derived from electrochemical methods were discussed. Pure, binary blend and ternary blend polysaccharide and protein hydrogels with multiple functionalities prepared by electrodeposition were summarized. In addition, we have reviewed the applications of these hydrogels in drug delivery, tissue engineering and wound dressing.
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Xu, Sihao, Jonathan Yeow et Cyrille Boyer. « Exploiting Wavelength Orthogonality for Successive Photoinduced Polymerization-Induced Self-Assembly and Photo-Crosslinking ». ACS Macro Letters 7, no 11 (5 novembre 2018) : 1376–82. http://dx.doi.org/10.1021/acsmacrolett.8b00741.

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Tie, Zuo-Xiu, Meng Qin, Da-Wei Zou, Yi Cao et Wei Wang. « Photo-Crosslinking Induced Geometric Restriction Controls the Self-Assembly of Diphenylalanine Based Peptides ». Chinese Physics Letters 28, no 2 (février 2011) : 028702. http://dx.doi.org/10.1088/0256-307x/28/2/028702.

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Hu, Xiuli, Xuesi Chen, Haibo Cheng et Xiabin Jing. « Cinnamate-functionalized poly(ester-carbonate) : Synthesis and its UV irradiation-induced photo-crosslinking ». Journal of Polymer Science Part A : Polymer Chemistry 47, no 1 (24 novembre 2008) : 161–69. http://dx.doi.org/10.1002/pola.23134.

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Wang, Yu-Cai, Juan Wu, Yang Li, Jin-Zhi Du, You-Yong Yuan et Jun Wang. « Engineering nanoscopic hydrogels via photo-crosslinking salt-induced polymer assembly for targeted drug delivery ». Chemical Communications 46, no 20 (2010) : 3520. http://dx.doi.org/10.1039/c002620d.

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Jang, Jinah, Taek Gyoung Kim, Byoung Soo Kim, Seok-Won Kim, Sang-Mo Kwon et Dong-Woo Cho. « Tailoring mechanical properties of decellularized extracellular matrix bioink by vitamin B2-induced photo-crosslinking ». Acta Biomaterialia 33 (mars 2016) : 88–95. http://dx.doi.org/10.1016/j.actbio.2016.01.013.

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Heo, Jiseung, Rachel H. Koh, Whuisu Shim, Hwan D. Kim, Hyun-Gu Yim et Nathaniel S. Hwang. « Riboflavin-induced photo-crosslinking of collagen hydrogel and its application in meniscus tissue engineering ». Drug Delivery and Translational Research 6, no 2 (26 mars 2015) : 148–58. http://dx.doi.org/10.1007/s13346-015-0224-4.

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Rakhmetova, S. Yu, S. P. Radko, O. V. Gnedenko, N. V. Bodoev, A. S. Ivanov et A. I. Archakov. « Photoaptamer heterodimeric constructs as a new approach to enhance the efficiency of formation of photocrosslinking with a target protein ». Biomeditsinskaya Khimiya 56, no 1 (janvier 2010) : 72–81. http://dx.doi.org/10.18097/pbmc20105601072.

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Using two DNA aptamers selectively recognizing anion-binding exosites 1 and 2 of thrombin as a model, it has been demonstrated that their conjugation by a poly-(dT)-linker (ranging from 5 to 65 nt in length) to produce aptamer heterodimeric constructs results into affinity enhancement. The apparent dissociation constant (Kdapp) measured at the optical biosensor Biacore-3000 for complexes of thrombin with the heterodimeric constructs reached minimum values (Kdapp = 0,2-0,4 nМ) which were approximately 30-fold less than for the complexes with the primary aptamers. A photoaptamer heterodimeric construct was designed connecting photoaptamer and aptamer sequences with the poly-(dT)-linker of 35 nt long. The photoaptamer used could form photo-induced cross-links with the exosite 2 of thrombin and the aptamer used could bind to the exosite 1. The measured value of Kdapp for the photoaptamer construct was approximately 40-fold less than that for the primary photoaptamer (5,3 and 190 nM, respectively). Upon exposure to the UV radiation at 308 nm of the equimolar mixtures of thrombin with the photoaptamer construct, the equal yield of the crosslinked complexes was observed at concentrations which were lower by two orders of magnitude than in the case of the primary photoaptamer. It was found that concurrently with crosslinking to thrombin a photo-induced inactivation of the photoaptamer occurs presumably due to formation of the intermolecular crosslinking.
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Di Muzio, Laura, Patrizia Paolicelli, Chiara Brandelli, Stefania Cesa, Jordan Trilli, Stefania Petralito et Maria Antonietta Casadei. « Injectable and In Situ Gelling Dextran Derivatives Containing Hydrolyzable Groups for the Delivery of Large Molecules ». Gels 7, no 4 (24 septembre 2021) : 150. http://dx.doi.org/10.3390/gels7040150.

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Recently, we reported the synthesis and characterization of a new dextran derivative obtained by grafting polyethylene glycol methacrylate to a polysaccharide backbone through a carbonate bond. This moiety was introduced because it allows for the fabrication, through a photo-induced crosslinking reaction, of biodegradable hydrogels particularly suitable for the release of high molecular weight molecules. Here, we investigate the influence of the oxyethylene chain length and the molecular weight of the starting dextran on the main properties of the polymeric solutions as well as those of the corresponding hydrogels. All synthesized polymeric derivatives were characterized by FTIR, NMR, and rheological analyses. The photo-crosslinking reaction of the polymers allowed us to obtain biodegradable networks tested for their mechanical properties, swelling, and degradation behavior. The results showed that both the oxyethylene chain length as well as the molecular weight of the starting dextran influenced swelling and degradation of the hydrogel network. As a consequence, the different behaviors in terms of swelling and degradability were able to affect the release of a large model molecule over time, making these matrices suitable candidates for the delivery of high molecular weight drug substances.
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Jiang, Zewu, Qingqing Sun, Qian Li et Xiaomeng Li. « Fabrication of Silk Hydrogel Scaffolds with Aligned Porous Structures and Tunable Mechanical Properties ». Gels 9, no 3 (24 février 2023) : 181. http://dx.doi.org/10.3390/gels9030181.

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The effectiveness of cell culture and tissue regeneration largely depends on the structural and physiochemical characteristics of tissue-engineering scaffolds. Hydrogels are frequently employed in tissue engineering because of their high-water content and strong biocompatibility, making them the ideal scaffold materials for simulating tissue structures and properties. However, hydrogels created using traditional methods have low mechanical strength and a non-porous structure, which severely restrict their application. Herein, we successfully developed silk fibroin glycidyl methacrylate (SF-GMA) hydrogels with oriented porous structures and substantial toughness through directional freezing (DF) and in situ photo-crosslinking (DF-SF-GMA). The oriented porous structures in the DF-SF-GMA hydrogels were induced by directional ice templates and maintained after photo-crosslinking. The mechanical properties, particularly the toughness, of these scaffolds were enhanced compared to the traditional bulk hydrogels. Interestingly, the DF-SF-GMA hydrogels exhibit fast stress relaxation and variable viscoelasticity. The remarkable biocompatibility of the DF-SF-GMA hydrogels was further demonstrated in cell culture. Accordingly, this work reports a method to prepare tough SF hydrogels with aligned porous structures, which can be extensively applied to cell culture and tissue engineering.
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Kumar, Arun, Somarupa Sahoo, Akanksha Dixit, Anjali A. Karande et Akhil R. Chakravarty. « Biotin-tagged cis-dichlorido-oxidovanadium(IV) complex for DNA crosslinking and photo-induced apoptotic cytotoxicity ». Inorganica Chimica Acta 528 (décembre 2021) : 120629. http://dx.doi.org/10.1016/j.ica.2021.120629.

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Bortolato, Santiago A., Katelyn E. Thomas, Kristin McDonough, Richard W. Gurney et Débora M. Martino. « Evaluation of photo-induced crosslinking of thymine polymers using FT-IR spectroscopy and chemometric analysis ». Polymer 53, no 23 (octobre 2012) : 5285–94. http://dx.doi.org/10.1016/j.polymer.2012.09.007.

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Kumar, Arun, Akanksha Dixit, Somarupa Sahoo, Samya Banerjee, Arnab Bhattacharyya, Aditya Garai, Anjali A. Karande et Akhil R. Chakravarty. « Crystal structure, DNA crosslinking and photo-induced cytotoxicity of oxovanadium(IV) conjugates of boron-dipyrromethene ». Journal of Inorganic Biochemistry 202 (janvier 2020) : 110817. http://dx.doi.org/10.1016/j.jinorgbio.2019.110817.

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Hasa, Erion, Jeffrey W. Stansbury et C. Allan Guymon. « Manipulation of crosslinking in photo-induced phase separated polymers to control morphology and thermo-mechanical properties ». Polymer 202 (août 2020) : 122699. http://dx.doi.org/10.1016/j.polymer.2020.122699.

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Tozar, Tatiana, Simona Nistorescu, Mihai Boni, Gratiela Gradisteanu Gradisteanu Pircalabioru, Irina Negut et Angela Staicu. « Pulsed Laser Photo-Crosslinking of Gelatin Methacryloyl HydroGels for the Controlled Delivery of Chlorpromazine to Combat Antimicrobial Resistance ». Pharmaceutics 14, no 10 (6 octobre 2022) : 2121. http://dx.doi.org/10.3390/pharmaceutics14102121.

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Hydrogels are ideal candidates for the sustained local administration of antimicrobial drugs because they have customizable physicochemical properties that allow drug release kinetics to be controlled and potentially address the issue of systemic side effects. Consequently, the purpose of this study was to use 266 nm-pulsed laser beams to photo-crosslink gelatin methacryloyl hydrogels using Irgacure 2959 as a photo-initiator to reduce the curing time and to have an online method to monitor the process, such as laser-induced fluorescence. Additionally, irradiated chlorpromazine was loaded into the hydrogels to obtain a drug delivery system with antimicrobial activity. These hydrogels were investigated by UV–Vis and FTIR absorption spectroscopy, scanning electron microscopy, and laser-induced fluorescence spectroscopy and their structural and morphological characteristics, swelling behavior, and drug release profile were obtained. As a result the morphology, swelling behavior, and drug release profile were influenced by both the energy of the laser beam and the exposure time. The optimal hydrogel was obtained after 1 min of laser irradiation for Irgacure 2959 at 0.05% w/v concentration and gelatin methacryloyl at 10% w/v concentration. The hydrogels loaded with irradiated chlorpromazine show significant antimicrobial activity against Staphylococcus aureus and MRSA bacteria and a non-cytotoxic effect against L929 fibroblast cell lines.
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Ussia, Martina, Giusy Curcuruto, Daniela Zampino, Nadka Tzankova Dintcheva, Giovanni Filippone, Raniero Mendichi et Sabrina Carola Carroccio. « Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites ». Polymers 12, no 5 (2 mai 2020) : 1034. http://dx.doi.org/10.3390/polym12051034.

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The photo-oxidative degradation processes of bio-based PA11 nanocomposites containing montmorillonite (MMT) and the organo-modified Cloisite®30B were investigated to discriminate the influence of organo-modified components on the polymer durability. Indeed, despite the extensive studies reported, there are still ambiguous points to be clarified from the chemical point of view. To this aim, UV-aged materials were analyzed by Size Exclusion Chromatography (SEC), Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) and Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS). This enabled determining changes in both chemical structure and Molar Masses (MMs) induced by light, heat and oxygen exposure. The addition of organo-modified nanoclays strongly affected the PA11 light durability, triggering the macromolecular chains scission due to the typical αH, Norrish I and II mechanisms. However, the main contribution in boosting the photo-oxidative degradation is induced by iron impurities contained into the clays. Conversely, thermo-oxidation process performed at 215 °C was unambiguously affected by the presence of the organo-modifiers, whose presence determined an enhancement of crosslinking reactions.
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Tachi, Hideki, et Masahiro Tsunooka. « Photo-Induced Thermal Crosslinking of Epoxy Compounds by the Use of Quaternary Ammonium Salts Having Phenacyl Groups. » Journal of Photopolymer Science and Technology 12, no 2 (1999) : 313–14. http://dx.doi.org/10.2494/photopolymer.12.313.

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Li, Chen, Lina Sheng, Gang Sun et Luxin Wang. « The application of ultraviolet-induced photo-crosslinking in edible film preparation and its implication in food safety ». LWT 131 (septembre 2020) : 109791. http://dx.doi.org/10.1016/j.lwt.2020.109791.

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Roose, Patrice, Evelien Vermoesen et Sandra Van Vlierberghe. « Non-steady scaling model for the kinetics of the photo-induced free radical polymerization of crosslinking networks ». Polymer Chemistry 11, no 14 (2020) : 2475–84. http://dx.doi.org/10.1039/d0py00106f.

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Arisaka, Yoshinori, Yuka Nishijima, Shin-ichi Yusa et Naoya Takeda. « Photo-induced in situ crosslinking of polymer brushes with dimethyl maleimide moieties for dynamically stimulating stem cell differentiation ». Journal of Biomaterials Science, Polymer Edition 27, no 13 (23 juin 2016) : 1331–40. http://dx.doi.org/10.1080/09205063.2016.1196531.

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Kurochkina, Lidija, et Galina Kolomijtseva. « Photo-induced crosslinking of histones H3 and H1 to DNA in deoxyribonucleoprotein : Implication in studying histone-DNA interactions ». Biochemical and Biophysical Research Communications 187, no 1 (août 1992) : 261–67. http://dx.doi.org/10.1016/s0006-291x(05)81486-x.

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Ida, Shohei, Ryohei Kimura, Satoshi Tanimoto et Yoshitsugu Hirokawa. « End-crosslinking of controlled telechelic poly(N-isopropylacrylamide) toward a homogeneous gel network with photo-induced self-healing ». Polymer Journal 49, no 2 (30 novembre 2016) : 237–43. http://dx.doi.org/10.1038/pj.2016.112.

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Modjinou, Tina, Davy Louis Versace, Samir Abbad Andaloussi, Valérie Langlois et Estelle Renard. « Co-Networks Poly(hydroxyalkanoates)-Terpenes to Enhance Antibacterial Properties ». Bioengineering 7, no 1 (21 janvier 2020) : 13. http://dx.doi.org/10.3390/bioengineering7010013.

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Biocompatible and biodegradable bacterial polyesters, poly(hydroxyalkanoates) (PHAs), were combined with linalool, a well-known monoterpene, extracted from spice plants to design novel antibacterial materials. Their chemical association by a photo-induced thiol-ene reaction provided materials having both high mechanical resistance and flexibility. The influence of the nature of the crosslinking agent and the weight ratio of linalool on the thermo-mechanical performances were carefully evaluated. The elongation at break increases from 7% for the native PHA to 40% for PHA–linalool co-networks using a tetrafunctional cross-linking agent. The materials highlighted tremendous anti-adherence properties against Escherichia coli and Staphylococcus aureus by increasing linalool ratios. A significant decrease in antibacterial adhesion of 63% and 82% was observed for E. coli and S. aureus, respectively.
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Long, Xiangyu, Jun Ren, Chao Zhang, Fangling Ji et Lingyun Jia. « Facile and Controllable Fabrication of Protein-Only Nanoparticles through Photo-Induced Crosslinking of Albumin and Their Application as DOX Carriers ». Nanomaterials 9, no 5 (24 mai 2019) : 797. http://dx.doi.org/10.3390/nano9050797.

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Protein-based nanoparticles, as an alternative to conventional polymer-based nanoparticles, offer great advantages in biomedical applications owing to their functional and biocompatible characteristics. However, the route of fabrication towards protein-based nanoparticles faces substantial challenges, including limitations in size control and unavoidable usage of toxic crosslinkers or organic solvents, which may raise safety concerns related to products and their degradation components. In the present study, a photo-induced crosslinking approach was developed to prepare stable, size-controlled protein-only nanoparticles. The facile one-step reaction irradiated by visible light enables the formation of monodispersed bovine serum albumin nanoparticles (BSA NPs) within several minutes through a tyrosine photo-redox reaction, requiring no cross-linking agents. The size of the BSA NPs could be precisely manipulated (from 20 to 100 nm) by controlling the duration time of illumination. The resultant BSA NPs exhibited spherical morphology, and the α-helix structure in BSA was preserved. Further study demonstrated that the 35 nm doxorubicin (DOX)-loaded BSA NPs achieved a drug loading content of 6.3%, encapsulation efficiency of 70.7%, and a controlled release profile with responsivity to both pH and reducing conditions. Importantly, the in vitro drug delivery experiment demonstrated efficient cellular internalizations of the DOX-loaded BSA NPs and inhibitory activities on MCF-7 and HeLa cells. This method shows the promise of being a platform for the green synthesis of protein-only nanoparticles for biomedical applications.
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Andreev, Oleg A., Yana K. Reshetnyak et Ronald H. Goldfarb. « Evidence of inter- and intra-molecular crosslinking of tyrosine residues of calmodulin induced by photo-activation of ruthenium(ii) ». Photochemical & ; Photobiological Sciences 1, no 10 (1 août 2002) : 834–36. http://dx.doi.org/10.1039/b201474b.

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Wang, Meng, Yu-xiang Jia, Ting-ting Yao et Kai-kai Wang. « The endowment of monovalent selectivity to cation exchange membrane by photo-induced covalent immobilization and self-crosslinking of chitosan ». Journal of Membrane Science 442 (septembre 2013) : 39–47. http://dx.doi.org/10.1016/j.memsci.2013.04.027.

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Kitayama, Yukiya, et Toshifumi Takeuchi. « Morphology control of shell-crosslinked polymer particles prepared by photo-induced shell-selective crosslinking approach via dispersed state control ». Journal of Colloid and Interface Science 530 (novembre 2018) : 88–97. http://dx.doi.org/10.1016/j.jcis.2018.06.043.

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Zhang, Yi, Richard T. Tran, Dipendra Gyawali et Jian Yang. « Development of Photocrosslinkable Urethane-Doped Polyester Elastomers for Soft Tissue Engineering ». International Journal of Biomaterials Research and Engineering 1, no 1 (janvier 2011) : 18–31. http://dx.doi.org/10.4018/ijbre.2011010102.

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Finding an ideal biomaterial with the proper mechanical properties and biocompatibility has been of intense focus in the field of soft tissue engineering. This paper reports on the synthesis and characterization of a novel crosslinked urethane-doped polyester elastomer (CUPOMC), which was synthesized by reacting a previously developed photocrosslinkable poly (octamethylene maleate citrate) (POMC) prepolymers (pre-POMC) with 1,6-hexamethylene diisocyanate (HDI) followed by thermo- or photo-crosslinking polymerization. The mechanical properties of the CUPOMCs can be tuned by controlling the molar ratios of pre-POMC monomers, and the ratio between the prepolymer and HDI. CUPOMCs can be crosslinked into a 3D network through polycondensation or free radical polymerization reactions. The tensile strength and elongation at break of CUPOMC synthesized under the known conditions range from 0.73±0.12MPa to 10.91±0.64MPa and from 72.91±9.09% to 300.41±21.99% respectively. Preliminary biocompatibility tests demonstrated that CUPOMCs support cell adhesion and proliferation. Unlike the pre-polymers of other crosslinked elastomers, CUPOMC pre-polymers possess great processability demonstrated by scaffold fabrication via a thermally induced phase separation method. The dual crosslinking methods for CUPOMC pre-polymers should enhance the versatile processability of the CUPOMC used in various conditions. Development of CUPOMC should expand the choices of available biodegradable elastomers for various biomedical applications such as soft tissue engineering.
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Bortolato, Santiago A., Kristin McDonough, Richard W. Gurney et Débora M. Martino. « Second order multivariate curve resolution of Fourier transform infrared spectroscopic data of the photo-induced crosslinking of thymine functionalized polymers ». Talanta 127 (septembre 2014) : 204–10. http://dx.doi.org/10.1016/j.talanta.2014.04.014.

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Podevyn, Annelore, Sandra Van Vlierberghe, Peter Dubruel et Richard Hoogenboom. « Design and Synthesis of Hybrid Thermo-Responsive Hydrogels Based on Poly(2-oxazoline) and Gelatin Derivatives ». Gels 8, no 2 (18 janvier 2022) : 64. http://dx.doi.org/10.3390/gels8020064.

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The combination of natural and synthetic polymers to form hybrid hydrogels offers the potential of fabricating new materials that possess a combination of properties resulting from both types of polymer classes. Within this work, two alkene-functionalized poly(2-alkyl/aryl–2-oxazoline) (PAOx) copolymers and one gelatin derivative, thiolated gelatin (gel-SH), are synthesized as precursors for hybrid hydrogels through a photo-induced radical thiol-ene crosslinking process. In-situ photo-rheology revealed an increased mechanical stability for hydrogels that possess an excess amount of PAOx precursor. A final qualitative investigation of the thermo-responsive properties of a P(EtOx270–norbornenOx30):gel-SH (2:1) hydrogel film revealed a cloud point temperature (Tcp) in the same range as the Tcp of the P(EtOx270–norbornenOx30) polymer precursor, which is around 30 °C. This promising result demonstrates that thermo-responsive hybrid poly(2-oxazoline)-gelatin hydrogels could be prepared with predictable Tcps and that further investigation into this appealing feature might be of interest. Ultimately, this work shows a proof-of-concept of using PAOx as potential hybrid hydrogel precursor in combination with cell-interactive gelatin derivatives to potentially improve the mechanical stability of the final scaffolds and introduce additional features such as thermo-responsiveness for the purpose of drug delivery.
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Pena, Ana-Maria, Shosuke Ito, Thomas Bornschlögl, Sébastien Brizion, Kazumasa Wakamatsu et Sandra Del Bino. « Multiphoton FLIM Analyses of Native and UVA-Modified Synthetic Melanins ». International Journal of Molecular Sciences 24, no 5 (24 février 2023) : 4517. http://dx.doi.org/10.3390/ijms24054517.

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To better understand the impact of solar light exposure on human skin, the chemical characterization of native melanins and their structural photo-modifications is of central interest. As the methods used today are invasive, we investigated the possibility of using multiphoton fluorescence lifetime (FLIM) imaging, along with phasor and bi-exponential fitting analyses, as a non-invasive alternative method for the chemical analysis of native and UVA-exposed melanins. We demonstrated that multiphoton FLIM allows the discrimination between native DHI, DHICA, Dopa eumelanins, pheomelanin, and mixed eu-/pheo-melanin polymers. We exposed melanin samples to high UVA doses to maximize their structural modifications. The UVA-induced oxidative, photo-degradation, and crosslinking changes were evidenced via an increase in fluorescence lifetimes along with a decrease in their relative contributions. Moreover, we introduced a new phasor parameter of a relative fraction of a UVA-modified species and provided evidence for its sensitivity in assessing the UVA effects. Globally, the fluorescence lifetime properties were modulated in a melanin-dependent and UVA dose-dependent manner, with the strongest modifications being observed for DHICA eumelanin and the weakest for pheomelanin. Multiphoton FLIM phasor and bi-exponential analyses hold promising perspectives for in vivo human skin mixed melanins characterization under UVA or other sunlight exposure conditions.
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Curry, Alyson M., Ricardo D. Fernàndez, Talita D. Pagani, Dinendra L. Abeyawardhane, Morgan L. Trahan et Heather R. Lucas. « Mapping of Photochemically-Derived Dityrosine across Fe-Bound N-Acetylated α-Synuclein ». Life 10, no 8 (27 juillet 2020) : 124. http://dx.doi.org/10.3390/life10080124.

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Parkinson’s disease (PD) is the second most common neurological disease and belongs to a group of neurodegenerative disorders called synucleinopathies in which pathological aggregates of N-terminally acetylated α-synuclein (NAcα-Syn) accumulate in various regions of the brain. In PD, these NAcα-Syn aggregates have been found to contain covalent dityrosine crosslinks, which can occur either intermolecularly or intramolecularly. Cerebral metal imbalance is also a hallmark of PD, warranting investigations into the effects of brain biometals on NAcα-Syn. NAcα-Syn is an intrinsically disordered protein, and metal-mediated conformational modifications of this structurally dynamic protein have been demonstrated to influence its propensity for dityrosine formation. In this study, a library of tyrosine-to-phenylalanine (Y-to-F) NAcα-Syn constructs were designed in order to elucidate the nature and the precise residues involved in dityrosine crosslinking of Fe-bound NAcα-Syn. The structural capacity of each mutant to form dityrosine crosslinks was assessed using Photo-Induced Cross-Linking of Unmodified Proteins (PICUP), demonstrating that coordination of either FeIII or FeII to NAcα-Syn inhibits dityrosine crosslinking among the C-terminal residues. We further demonstrate that Y39 is the main contributor to dityrosine formation of Fe-bound NAcα-Syn, while Y125 is the main residue involved in dityrosine crosslinks in unmetalated NAcα-Syn. Our results confirm that iron coordination has a global effect on NAcα-Syn structure and reactivity.
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Park, Junyoung, Nahee Kim, Kevin Injoe Jung, Soomin Yoon, Seung Man Noh, Joona Bang et Hyun Wook Jung. « Effect of Silica Nanoparticles Blocked with Epoxy Groups on the Crosslinking and Surface Properties of PEG Hydrogel Films ». Polymers 13, no 19 (27 septembre 2021) : 3296. http://dx.doi.org/10.3390/polym13193296.

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Silica nanoparticles (G-SiNPs) blocked with 3-glycidoxypropyl trimethoxysilane (GPTS) were newly applied to hydrogel films for improving film coating properties and to distribute the epoxy groups on the film surface. The effects of the content of epoxy-functionalized G-SiNPs on the crosslinking features by photo-induced radical polymerization and the surface mechanical properties of the hydrogel films containing poly(ethylene glycol) dimethacrylate (PEGDMA) and glycidyl methacrylate (GMA) were investigated. The real-time elastic modulus of various PEG hydrogel mixtures with prepared particles was monitored using a rotational rheometer. The distribution of epoxy groups on the crosslinked film surface was directly and indirectly estimated by the elemental analysis of Si and Br. The surface mechanical properties of various hydrogel films were measured by nano-indentation and nano-scratch tests. The relationship between the rheological and surface properties of PEG-based hydrogel films suggests that the use of small amounts of G-SiNPs enhances the surface hardness and crosslinked network of the film and uniformly distributes sufficient epoxy groups on the film surface for further coating applications.
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Danko, Martin, Jaroslav Mosnáček, Shiao-Wei Kuo et Ivan Lukáč. « Crosslinking of polystyrene film by di(4-dibenzoyl peroxide) ether synthesized or formed in situ using visible light-induced photo-peroxidation of 4,4’-oxydibenzil ». Journal of Photochemistry and Photobiology A : Chemistry 403 (décembre 2020) : 112849. http://dx.doi.org/10.1016/j.jphotochem.2020.112849.

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Poplawska, Malgorzata, Iska Schimpf, Damien Brady, Carmel Kealey, Anne Mulvihill et Clement L. Higginbotham. « Synthesis and Characterization of Polyethylene Glycol Dimethacrylate Hydrogels for Biomedical Application ». Applied Mechanics and Materials 679 (octobre 2014) : 158–70. http://dx.doi.org/10.4028/www.scientific.net/amm.679.158.

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Photo-polymerized polyethylene glycol dimethacrylate (PEGDMA) scaffolds were synthesized using two macromolecular monomers of 750 and 550 number average molecular weight. Variation in chain length of macromolecular monomers visibly influenced viscoelastic properties of the compositions, exhibiting an increase in shear storage and loss modulus in PEGDMA 750 hydrogels. Furthermore, water content in the pre-polymerization mixture was a main factor determining physical appearance of the samples, where increase in water content resulted in polymerization induced phase separation, demonstrated by opaqueness of preparations containing 60 and 75% (w/w) of H2O. In addition to this, swelling, gel fraction, compression and rheological measurements are found to be influenced by the amount of water incorporated in the hydrogels, resulting in the increased distance between polymer chains within the network. Furthermore this resulted in an apparent decrease in viscoelastic and mechanical properties of compositions, as well as in lowering their crosslinking density and compressive strength. Preliminary cytotoxicity results show no toxicity of the samples with approximately 80% cell viability after 24 h exposure of MC3T3-E1 Subclone 4 cells to the hydrogels, thus indicating that these materials could be potentially applied in the biomedical arena.
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Chen, Juan-nan, Yi-de He, Hui-ting Liang, Ting-ting Cai, Qi Chen et Ke-wei Zheng. « Regulation of PDGFR-β gene expression by targeting the G-vacancy bearing G-quadruplex in promoter ». Nucleic Acids Research 49, no 22 (30 novembre 2021) : 12634–43. http://dx.doi.org/10.1093/nar/gkab1154.

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Abstract G-quadruplex is an essential element in gene transcription that serves as a promising drug target. Guanine-vacancy-bearing G-quadruplex (GVBQ) is a newly identified G-quadruplex that has distinct structural features from the canonical G-quadruplex. Potential GVBQ-forming motifs are widely distributed in gene promoter regions. However, whether GVBQ can form in genomic DNA and be an effective target for manipulating gene expression is unknown. Using photo-crosslinking, dimethyl sulfate footprinting, exonuclease digestion and in vitro transcription, we demonstrated the formation of a GVBQ in the G-rich nuclease hypersensitivity element within the human PDGFR-β gene promoter region in both single-stranded and double-stranded DNA. The formation of GVBQ in dsDNA could be induced by negative supercoiling created by downstream transcription. We also found that the PDGFR-β GVBQ was specifically recognized and stabilized by a new synthetic porphyrin guanine conjugate (mPG). Targeting the PDGFR-β GVBQ in human cancer cells using the mPG could specifically alter PDGFR-β gene expression. Our work illustrates that targeting GVBQ with mPG in human cells can regulate the expression level of a specific gene, thus indicating a novel strategy for drug development.
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