Effect of heat treatment on denaturation of whey protein and resultant rennetability of camel milk
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Effect of heat treatment on denaturation of whey protein and resultant rennetability of camel milk. / Genene, Almaz; Hansen, Egon Bech; Eshetu, Mitiku; Hailu, Yonas; Ipsen, Richard.
In: LWT, Vol. 101, 2019, p. 404-409.Research output: Contribution to journal › Journal article › peer-review
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TY - JOUR
T1 - Effect of heat treatment on denaturation of whey protein and resultant rennetability of camel milk
AU - Genene, Almaz
AU - Hansen, Egon Bech
AU - Eshetu, Mitiku
AU - Hailu, Yonas
AU - Ipsen, Richard
PY - 2019
Y1 - 2019
N2 - The effect of varying heat treatments (65 °C/30 min, 72 °C/30 s, 75 °C/5 min, 85 °C/5 min, 90 °C/5 min) on the degree of whey protein denaturation and rennetability of camel milk was investigated. Bovine milk was used for comparison. In camel milk α-lactalbumin exhibited less denaturation than in bovine milk following heat treatment for 90 °C/5 min and 67% α-lactalbumin was un-denatured as compared to the initial raw milk content, whereas this was only 5% in bovine milk. Camel serum albumin, however, showed substantial denaturation with increase in heat treatment. The gelation time as well as the time to reach maximal gel strength was significantly increased with heat treatment. Camel milk preconditioned to 40 °C exhibited a short gelation time (6 min) which increased to 14 min for milk treated at 65 °C/30 min. Heat treatments at 72 °C/30 s for camel milk resulted in loss of coagulation properties, i.e. very low gel strength or no coagulation within 60 min. A heat treatment process of 65 °C/30 min or 72 °C/30sec is thus recommended, when making cheese from camel milk.
AB - The effect of varying heat treatments (65 °C/30 min, 72 °C/30 s, 75 °C/5 min, 85 °C/5 min, 90 °C/5 min) on the degree of whey protein denaturation and rennetability of camel milk was investigated. Bovine milk was used for comparison. In camel milk α-lactalbumin exhibited less denaturation than in bovine milk following heat treatment for 90 °C/5 min and 67% α-lactalbumin was un-denatured as compared to the initial raw milk content, whereas this was only 5% in bovine milk. Camel serum albumin, however, showed substantial denaturation with increase in heat treatment. The gelation time as well as the time to reach maximal gel strength was significantly increased with heat treatment. Camel milk preconditioned to 40 °C exhibited a short gelation time (6 min) which increased to 14 min for milk treated at 65 °C/30 min. Heat treatments at 72 °C/30 s for camel milk resulted in loss of coagulation properties, i.e. very low gel strength or no coagulation within 60 min. A heat treatment process of 65 °C/30 min or 72 °C/30sec is thus recommended, when making cheese from camel milk.
KW - Camel milk
KW - Denaturation
KW - Heat treatment
KW - Rennetability
KW - Whey protein
U2 - 10.1016/j.lwt.2018.11.047
DO - 10.1016/j.lwt.2018.11.047
M3 - Journal article
AN - SCOPUS:85057060722
VL - 101
SP - 404
EP - 409
JO - Lebensmittel - Wissenschaft und Technologie
JF - Lebensmittel - Wissenschaft und Technologie
SN - 0023-6438
ER -
ID: 210010797