Q) The following figure shows the effect of heat treatment on the stability (y-a
ID: 301783 • Letter: Q
Question
Q) The following figure shows the effect of heat treatment on the stability (y-axis) of whey protein isolate foams over time. Higher values on the y-axis indicate greater stability. Based on your knowledge of protein functionality and the figure below, answer the following questions.
a. What changes take place in the protein during heat treatment at 70C for 1, 5, 10, and 20 minutes?
b. What treatment resulted in the foam with the greatest stability? Why?
.1 01 ,001 20 40 60 Time (min) FIGURE 20 Surface area decay of foams of whey protein isolate (WPI) heated at 70°C and 5% protein concentration conditions for various times. Foams were formed using 5% w in water at pH 6.8, 25°C. From Ref. 40.)Explanation / Answer
Ans a...as the temprature increases or the duration of a constant high temprature increases their occurs denaturation of the proteins.with increase duration of high temprature their is break down of peptide bonds which leads to denaturation of proteins and thus the stability of prtoeins will decreases.
Ans b..the greatest stability is seen when temprature duration is 5 minutes .it is because the duration is less so the denaturation of proteins is less so stability will be more
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