Performance evaluation of ultra violet assisted vertical re-circulating depuration system on microbial, heavy metal reduction and composition of black clam (Villorita cyprinoides)

• Published in: Food science & technology 2021-03, Vol.138, p.110628, Article 110628
• Main Authors: Anjana, S., Abhilash, S., Varghese, B., Sabu, S., Sunooj, K.V., Xavier, K.A. Martin
• Format: Article
• Language: English
• Subjects: Clams; Depuration; Heavy metals; Total viable count; Vibrio parahaemolyticus
• ISSN: 0023-6438; 1096-1127
• DOI: 10.1016/j.lwt.2020.110628

A cost-effective, portable, ultra violet assisted vertical re-circulatory depuration system (UVDC) was developed and its effect on microbiological, heavy metal and proximate composition of Black clam (Villorita cyprinoides) was investigated. The process of depuration was found to be effective in reduction of total viable count by 1.8 log cfu g-1. Escherichia coli were within the permissible limit and both Vibrio cholera and V. parahaemolyticus were absent. The concentrations of heavy metals (Cd, Pb and Cu) were found to decrease by 40.44%, 96.51% and 34.50% respectively at the end of 48 h of depuration in UVDC. Significant reduction in protein, lipid, ash and glycogen contents were observed after the depuration process. The portability and easy to assemble nature of the system further improves its applicability as an onsite depuration unit which could be effectively utilized by the small-scale clam fishers/farmers depending on polluted waters for enhancing their income and livelihood. [Display omitted] •Portable UV assisted vertical, re-circulatory depuration system developed for bivalves.•Designed depuration unit significantly reduced heavy metal concentration in black clam.•After 48 h, E. coli was within the limit and V. cholera &V. parahaemolyticus were absent.•Easy to assemble, low cost depuration system for small scale clam fishers and farmers.