Fig. 1. Changes in pH of whiteleg shrimp, Litopenaus vannamei during refrigerated storage. Values represent the mean±standard deviation (n=3). Significant differences (P<05) among different days of storage in the same treatment are identified with different uppercase letters (A-H). Significant differences (P<05) among different treatments in the same storage time are identified with different lowercase letters (a-d). Control, sample treated water; SMS, sample treated with sodium metabisulfite (1.25%); CE, sample treated with Coffea arabica extract, PD-3, sample treated with PD-3 fraction obtained from Coffea arabica sediment extract.