Effect of Chitosan Nanoparticle Coatings on the Quality Changes of Postharvest Whiteleg Shrimp, Litopenaeus vannamei, During Storage at 4 °C

The effect of chitosan coatings on quality changes of shrimp, Litopenaeus vannamei, was studied during a 10-day storage at 4 A degrees C. Groups of treatment 1 (T-1), treatment 2 (T-2), and control were treated with carboxymethyl chitosan, chitosan nanoparticle, and deionized water, respectively. The lowest pH values (P < 0.05) were observed in T-2 on days 6, 8, and 10. Chitosan coatings significantly decreased (P < 0.05) total volatile basic nitrogen amounts and K values on the same day except day 0 and the lowest showed in T-2. Lower thiobarbituric acid (P < 0.05) and higher inosinic acid content (P < 0.05) were obtained in T-2 than those of the control on day 10. On day 10, the highest hardness and springiness (P < 0.05) and lowest total viable counts were obtained in T-2 followed by T-1 (P < 0.05). It suggested that chitosan nanoparticle coating exhibited better effect on quality maintenance of shrimp.