Abstract:

Nipagin A, propyl 4-hydroxybenzoate and natamycin were formulated and used to prolong the shelf life of dried persimmon. Based on orthogonal array design, the following regression model describing the shelf life of dried persimmon (y) as a function of the final concentrations of nipagin A (Z1), propyl 4-hydroxybenzoate (Z2) and natamycin (Z3) in aqueous solution: lny = 5.312 + 1776.5 Z1 + 300.8 Z2 + 217.7 Z3 －2244800 Z1 Z2. The lack-of-fit tests demonstrated that the accuracy of the model was more than 99%. According to response surface and single-factor linear analyses, when Z2 was less than 0.079 g/100 mL, Z1 and Z2 had positive correlation with y; when Z2 was more than 0.079 g/100 mL, Z1 and Z2 had negative correlation with y.

Key words: nipagin A, propyl 4-hydroxybenzoate, natamycin, response surface analysis, lack-of-fit test