Instructions :-

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Solubility (S,%) =

Right answer

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Sample S (g) P (g) F (g) P+F+IM (g)
(before drying)
P+F+IM (g)
(after drying)
IM (after drying) s (%)
A (pH 3.0) 10.00
B (pH 4.0) 10.00
C (pH 4.5) 10.00
D (pH 6.0) 10.00
E (pH 8.0) 10.00

Inference

The curve indicated that the solubility of protein affected by pH and it was minimum at pH 4.5, which is the isoelectric pH of the protein powder.