The stability of milk protein to heat: I. Subjective measurement of heat stability of milk

Journal of Dairy Research - Tập 33 Số 1 - Trang 67-81 - 1966
D. T. Davies1, J. C. D. White1
1The Hannah Dairy Research Institute, Ayr, Scotland

Tóm tắt

SummaryA subjective test for the determination of the stability of milk protein to heat is described. In the test, the time required for particles of coagulated protein to become visible throughout a 2·5-ml sample of separated milk maintained at 135°C in a glass tube rocking at 8 c/min is taken as a measure of stability. The precision of the test was such that single determinations were generally adequate.Coagulation time decreased by about 12% as rocking speed was increased over the range 4–12 c/min and increased by a factor of about 3 for a decrease in heating temperature of 10 degC over the range 140–105 °C; with some milks the Q10°C value increased to 5–8 a temperature decreased. As sample volume was increased over the range 1–3 ml coagulation time increased, especially With milks whose coagulation was poor (initial clots small). This volume effect appeared to be a consequence of the accompanying decrease in the proportion of headspace oxygen to volume of milk.

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Tài liệu tham khảo

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Journal of Dairy Research

Tập 33 Số 1

67-81

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