Effects of genistein on melanosis and microbial quality of Litopenaeus vannamei during ice storage

Utilization of genistein as a natural inhibitor was studied alone and in combination with conventional treatments on melanosis and microbial quality of fresh L. vannamei during ۱۰ days ice storage. Treatments were as followed: A (dipping samples in distilled water), B (dipping in ۱.۲۵ % sodium metabisulphite solution), C (dipping in ۰.۰۱ % genistein + ۲% glycerol solution), D (dipping in ۰.۱ % genistein + ۲% glycerol solution), E (dipping in ۱% NaCl + ۰.۰۵ % EDTA + ۰.۵ % ascorbic acid + ۰.۵ % lactic acid solution), F (dipping in ۰.۰۱% genistein + ۲ % glycerol + ۱ % NaCl + ۰.۰۵ % EDTA + ۰.۵ % ascorbic acid + ۰.۵ % lactic acid solution) and G (dipping in ۰.۱ % genistein + ۲ % glycerol + ۱ % NaCl + ۰.۰۵ % EDTA + ۰.۵ % ascorbic acid + ۰.۵ % lactic acid solution). Results showed that G treatment was more affective on inhibiting of melanosis in L. vannamei. Mesophilic and psycrophilic bacterial counts in G treatment were lower than other treatments during ice storage. 

Keywords:

Genistein , Melanosis , Litopenaeus vannamei , Microbial quality