ABSTRACT In this study, cuminaldehyde and chitosan coating were used to inhibit melanosis formation and prolong the shelf life of black tiger shrimp stored at 0°C. Four treatments including the control, 0.5% cuminaldehyde solution, 2% chitosan, and the combination of 0.5% cuminaldehyde and 2% chitosan solution were performed. Sensory, chemical, and microbiological analyses were used to evaluate the effectiveness of treatments during 17 days of storage. Melanosis scores, histamine, TMA‐N, TVB‐N indexes, and total visible count (TVC) were also measured. The results show that there is a correlation between TVC and melanosis score. Melanosis scores in treated samples were lower than those in control during storage. Melanosis score was approximately 6 on day 8 for control samples, day 13 for cuminaldehyde group, day 11 for chitosan samples, and day 15 for cuminaldehyde/chitosan samples. This is also the time when the TVC value of samples reached the log cfu/g threshold approximately 6, except for the cuminaldehyde samples with TVC value = 6.37. The concentration of TVB‐N, TMA‐N, and histamine gradually increased for all samples, while shrimp quality decreased with storage time. The regression equation between chemical indices and melanosis score was built on each sample group ( R 2 = 0.990). The combination of 0.5% cuminaldehyde and 2% chitosan treatment showed the high effectiveness in inhibiting melanosis formation and extending shelf life of shrimp compared to other treatments. The cuminaldehyde and chitosan combined treatment maintained the shrimp quality till 15 days, beyond the shelf life achieved with other evaluated applications.
TÂM et al. (Fri,) studied this question.
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