Bibliografie tematiche / Milk UF permeate

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Letteratura scientifica selezionata sul tema "Milk UF permeate"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Milk UF permeate"

Paredes Valencia, Adriana, Alain Doyen, Scott Benoit, Manuele Margni e Yves Pouliot. "Effect of Ultrafiltration of Milk Prior to Fermentation on Mass Balance and Process Efficiency in Greek-Style Yogurt Manufacture". Foods 7, n. 9 (4 settembre 2018): 144. http://dx.doi.org/10.3390/foods7090144.

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Abstract (sommario):

Ultrafiltration (UF) can be used to concentrate yogurt to produce Greek-style yogurt (GSY) (UF-YOG), but this generates acid whey permeate, which is an environmental issue. However, when UF is applied before fermentation (UF-MILK), a nonacidified whey permeate is generated. For this study, two model GSYs (UF-YOG and UF-MILK) were produced to compare the composition, UF performance, and energy consumption of the two processes. For UF-MILK, skim milk was ultrafiltered with a 30 kDa spiral-wound UF membrane to achieve a 3× volume reduction factor (VRF). The retentate was fermented to a pH of 4.5. The UF-YOG process was the same except that regular yogurt was ultrafiltered. Both GSYs had similar protein (~10%) and solid content (~17%). As expected, lactic acid/lactate was not detected in UF-MILK permeate, while 7.3 g/kg was recovered from the UF-YOG permeate. Permeation flux values (11.6 to 13.3 L m−2 h−1) and total flux decline (47% to 50%) were constant during UF-MILK, whereas drastic decreases in these two membrane performance indicators (average flux: 38.5 to 10.9 L m−2 h−1; total flux decline: 2% to 38%) were calculated for UF-YOG. Moreover, for UF-YOG, UF membrane performance never recovered, even when drastic and repeated cleaning steps were applied. Energy consumption was 1.6 kWh/kg GSY and remained constant for UF-MILK, whereas it increased from 0.6 to 1.5 kWh/kg GSY for UF-YOG. Our results show that, although the composition of GSYs was similar for both processes, the UF step of yogurt concentration affected process efficiency due to drastic and permanent membrane fouling.

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CAYLE, THEODORE, JULES H. GUTH, JOHN T. HYNES, EUGENE P. KOLEN e MAXINE L. STERN. "Penicillin Distribution During Cheese Manufacture and Membrane Treatment of Whey". Journal of Food Protection 49, n. 10 (1 ottobre 1986): 796–98. http://dx.doi.org/10.4315/0362-028x-49.10.796.

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Milk containing 0.005 U of benzyl 14C-penicillin G was used to make Cheddar cheese, and the whey was subsequently treated with ultrafiltration (UF) and reverse osmosis (RO). The distribution of labelled penicillin was monitored throughout milk and whey processing. The antibiotic concentrated in the moisture phases. Eight-six percent was recovered from the whey fraction, and approximately 12% from the cheese. Similar distribution patterns were detected for the whey UF permeate and retentate; 84% of the penicillin was in the permeate, and 19% remained in the retentate. The balance of penicillin was recovered primarily in the RO retentate fraction.

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McSweeney, David J., Valentyn Maidannyk, Sharon Montgomery, James A. O’Mahony e Noel A. McCarthy. "The Influence of Composition and Manufacturing Approach on the Physical and Rehydration Properties of Milk Protein Concentrate Powders". Foods 9, n. 2 (22 febbraio 2020): 236. http://dx.doi.org/10.3390/foods9020236.

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This study investigated the physical and rehydration properties of milk protein concentrate (MPC) powders with five different protein contents (i.e., 38.9, 53.7, 63.6, 74.1, and 84.7%, w/w) prepared by recombining the ultrafiltration (UF) retentate and UF permeate of skim milk. Powder density and flowability increased, while the powder particle size decreased with decreasing powder protein content. The amount of non-wetting MPC powder decreased with decreasing protein content, demonstrating greater wettability for lower protein powders. At protein contents >65% (w/w), the dispersibility and solubility of the powders decreased significantly, likely due to the greater hydrophobic interactions between casein proteins and a lower concentration of lactose. Therefore, as the protein content of the MPC powders was decreased, their rehydration properties improved. The results obtained in this study provide novel insights into the relationship between the composition of recombined UF retentate and UF permeate streams on the subsequent powder particle size, density, and rehydration properties, and demonstrate that such powders possess similar properties to those prepared using conventional direct membrane filtration.

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Puri, Ritika, Upendra Singh e James A. O’Mahony. "Influence of Processing Temperature on Membrane Performance and Characteristics of Process Streams Generated during Ultrafiltration of Skim Milk". Foods 9, n. 11 (23 novembre 2020): 1721. http://dx.doi.org/10.3390/foods9111721.

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The effects of processing temperature on filtration performance and characteristics of retentates and permeates produced during ultrafiltration (UF) of skim milk at 5, 20, and 50 °C were investigated. The results indicate that despite higher flux at 50 °C, UF under these conditions resulted in greater fouling and rapid flux decline in comparison with 5 and 20 °C. The average casein micelle diameter was higher in retentate produced at 5 and 20 °C. The retentate analysed at 5 °C displayed higher viscosity and shear thinning behaviour as compared to retentate analysed at 20 and 50 °C. Greater permeation of calcium and phosphorus was observed at 5 and 20 °C in comparison with 50 °C, which was attributed to the inverse relationship between temperature and solubility of colloidal calcium phosphate. Permeation of α-lactalbumin was observed at all processing temperatures, with permeation of β-lactoglobulin also evident during UF at 50 °C. All UF retentates were shown to have plasmin activity, while lower activity was measured in retentate produced at 5 °C. The findings revealed that UF processing temperature influences the physicochemical, rheological, and biochemical properties of, and thereby govern the resulting quality and functionality of, retentate- and permeate-based dairy ingredients.

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I., El-Batawy, Samar Mahdy e M. Abo El-Naga. "Utilization of Cheese Whey and UF Milk Permeate in Manufacture of Egyptian Baladi Bread". Alexandria Journal of Food Science and Technology 15, n. 1 (1 giugno 2018): 9–22. http://dx.doi.org/10.21608/ajfs.2018.16345.

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Fayed, Atef, Mohamed Abo El-Naga, Mohamed Khallaf e Marwa Eid. "VALUE ADDITION TO FROZEN DESSERTS THROUGH INCORPORATION OF PUMPKIN SOLIDS AND UF MILK PERMEATE". Arab Universities Journal of Agricultural Sciences 28, n. 3 (30 settembre 2020): 857–70. http://dx.doi.org/10.21608/ajs.2020.153600.

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HAGGERTY, PATRICIA, e NORMAN N. POTTER. "Growth and Death of Selected Microorganisms in Ultrafiltered Milk". Journal of Food Protection 49, n. 3 (1 marzo 1986): 233–35. http://dx.doi.org/10.4315/0362-028x-49.3.233.

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Studies were made to compare the growth and death of Staphylococcus aureus, Streptococcus faecalis and Escherichia coli in skim milk concentrated by ultrafiltration to that in unconcentrated skim milk. Skim milk was volume concentrated to 2× in laboratory-scale stirred UF cells. Behavior of the organisms was analyzed in four inoculated milk samples: 2× retentate, 1× water-diluted retentate, milk equivalent (retentate plus permeate) and unconcentrated skim milk. Growth of each organism and of total aerobes did not vary in the four milk samples at either 7 or 13°C. For S. faecalis and E. coli, D-values for samples heated to 62.7°C did not significantly differ in the four milk samples (p>0.01). The D-value of S. aureus in water-diluted retentate was slightly but significantly lower than those in the other three milk samples (p<0.01), possibly due to the lowered lactose level in this sample.

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KORNACKI, JEFFREY L., e ELMER H. MARTH. "Thermal Inactivation of Staphylococcus aureus in Retentates from Ultrafiltered Milk". Journal of Food Protection 52, n. 9 (1 settembre 1989): 631–37. http://dx.doi.org/10.4315/0362-028x-52.9.631.

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Cells of Staphylococcus aureus strains 196E, 481, and 425 were thermally stressed at 56°C for 10 min in milk and enumerated on Plate Count Agar (PCA), Mannitol Salt Agar (MSA), and PCA with an overlay of MSA. PCA recovered more S. aureus 196E and 481 than did PCA/MSA, which recovered more than MSA. PCA/MSA recovered slightly more S. aureus 425 than did PCA, which recovered more than MSA. At 58°C, in order of decreasing heat resistance, the four strains of S. aureus originally isolated from food were 425 > 100 and 481 > 196E. Their D-values were 26,14,13, and 3.0 min, respectively. S. aureus 425 was more heat resistant in the stationary than in the log phase when heated at 58°C in whole milk. Heat resistance at 58°C increased overall during the stationary growth phase, but was fairly stable when the culture was from 17 to 25 h or from 41 to 49 h old. S. aureus 425 exhibited no consistent differences in heat resistance in concentrated (4X by volume) and unconcentrated skim or whole milk. Adjustments of protein (3.5–4.0% to 12.6–16%), milkfat (0.28–1.12% to 10%), and lactose (ca. 4.5–5.0% to ca. 14.5–15%) contents of milk and 4X (volume concentration) UF milk retentates afforded no significant thermal protection to S. aureus 425. Diafiltration of 4X skim milk reduced thermal protection of S. aureus 425 in the retentate over that of unconcentrated skim milk of the same lot when tested at 63 and 74°C. S. aureus 425 had greatest D-values (min) in skim milk (0.36 ± 0.05) and permeate (0.30 ± 0.14) followed by permeate from diafiltration (0.28 ± 0.06) when tested at 63°C.

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Salunke, Prafulla, Chenchaiah Marella e Lloyd E. Metzger. "Microfiltration and Ultrafiltration Process to Produce Micellar Casein and Milk Protein Concentrates with 80% Crude Protein Content: Partitioning of Various Protein Fractions and Constituents". Dairy 2, n. 3 (19 luglio 2021): 367–84. http://dx.doi.org/10.3390/dairy2030029.

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Abstract (sommario):

The objective of the study reported in this research paper was to produce micellar casein concentrate (MCC) and milk protein concentrate (MPC) with 80% crude protein relative to total solids (TS) using MF and UF processes respectively. Additionally, capillary gel electrophoresis (CGE) was used to study the protein fractions in retentate and permeate. For MCC production, 227 L of pasteurized SM was subjected to MF using 0.5-micron spiral wound polyvinylidene fluoride membrane. During the process, diafiltration (DF) water was added at six intervals, totaling 100% of the feed volume. For MPC production, 227 L of pasteurized SM from the same lot was subjected to UF using 10 kDa Polyethersulfone membranes. During the process, DF water was added at four different intervals, with a final total addition of 40% of the feed volume. Both processes used a volume reduction of five. There were significant (p < 0.05) differences in all of the compositional parameters, except fat and casein for the MF retentate (MFR) and UF retentate (UFR). UFR had a higher crude protein (CP), TS, lactose, ash and calcium content as compared to MFR and this affected the CP/TS ratio found in both the retentates. The differences in membrane pore sizes, operating pressures and level of DF used all contributed to the differences in final CP/TS ratio obtained. The CGE analysis of individual protein fractions present in the UFR and MFR showed that UFR has a β-lactaglobulin to α-lactalbumin (α-LA) ratio similar to SM, whereas the MFR has a higher ratio, indicating preferential transmission for α-LA by the MF membrane. The results from this study show that MF and UF processes could be used for production of MCC and MPC with similar CP/TS ratio with careful selection of operating parameters, and that CGE can be used for detailed analysis of various protein fractions.

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Özcan, Merve, Ece Büyükgümüş e Selda Bulca. "Membran Seperasyon Tekniklerinin Süt Teknolojisinde Kullanımı ve Süt Ürünlerindeki Etkileri". Turkish Journal of Agriculture - Food Science and Technology 10, n. 11 (29 novembre 2022): 2115–24. http://dx.doi.org/10.24925/turjaf.v10i11.2115-2124.5188.

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Abstract (sommario):

Membrane separation techniques are used to separate certain components (protein, fat, water, etc.) in liquid products such as milk and to obtain these components in pure form, and also to remove microorganisms in these liquid products. In addition, these techniques are used to concentrate milk in the dairy industry. In membrane separation, components pass through pores of a certain size and are separated according to molecular weights. The basic principle in separation techniques is based on the fact that the liquid is passed through the pores of the membrane under certain pressure, the desired components (retantat) are kept in the pores and other components (permeate) pass through the membrane. The techniques used are grouped into four main categories: Microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and hyperfiltration (reverse osmosis). Among the advantages of the membrane separation technique are the low electricity consumption, the possibility of use in various areas, and the fact that it does not cause undesired changes in the product characteristics. There are disadvantages such as the cost of initial installation, fouling of the membrane pores, and the membrane cleaning takes a long time.

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Più fonti

Tesi sul tema "Milk UF permeate"

Chaudhary, Manoja Nand, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty e School of Food Science and Technology. "An evaluation of nanofiltration and lactose hydrolysis of milk UF permeate for use in ice cream". THESIS_FSTA_FST_Chaudhary_M.xml, 1997. http://handle.uws.edu.au:8081/1959.7/741.

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Abstract (sommario):

This study aimed to obtain 15% total solids and reduced mineral content in milk UF permeate by nanofiltration, hydrolysing the lactose content of nano-concentrate enzymically, partially substituting sucrose in ice cream formulations with hydrolysed lactose nano-concentrate (HLNC), and investigating the effects of HLNC on the physio-chemical and sensory characteristics of ice cream. The desired 15% total solids in the nano-concentrate was achieved after three fold concentration of milk UF permeate. The colour of milk permeate changed, pH and mineral content decreased, and crude protein content, lactose content and titratable acidity increased. The lactose content was hydrolysed by enzyme lactase. HLNC was used to replace 25% and 50% of sucrose in ice cream formulations. Springiness, cohesiveness, chewiness, adhesiveness, hardness, iciness, Ph and colour were not significantly affected. Viscosity, freezing point, glass transition temperature, melting temperature, gumminess and sweetness were significantly decreased, whereas freezing time, saltiness and cooked flavour were significantly increased. The overall acceptability of ice cream significantly decreased at 50% but was insignificantly affected at the 25% level. These results indicate that about one quarter of sucrose could be replaced by HLNC.
Master of Science (Hons) (Food Technology)

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Chaudhary, Manoja Nand. "An evaluation of nanofiltration and lactose hydrolysis of milk UF permeate for use in ice cream : thesis submitted in fulfilment of the requrement for the degree of Master of Science (Hons.) in Food Technology /". Richmond, N.S.W. : Faculty of Science, Technology and Agriculture, University of Western Sydney, 1997. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030528.125302/index.html.

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Chaudhary, Manoja N. "An evaluation of nanofiltration and lactose hydrolysis of milk UF permeate for use in ice cream". Thesis, 1997. http://handle.uws.edu.au:8081/1959.7/741.

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