Evaluation of harmful heavy metal (Hg, Pb and Cd) reduction using Halomonas elongata and Tetragenococcus halophilus for protein hydrolysate product

摘要

Background: Fermented fish is one form of natural protein hydrolysate has been reported to have many health benefits such as antihypertensive, antioxidative activity and anti-inflammatory peptides. However, as known that toxic heavy metal is widely spread and entered throughout the food chain particularly in tuna internal organ which is widely used to process fermented product or discharged to be fish meal. Consumption of fermented tuna viscera containing heavy metal is risky. Detoxifying and/ or reducing those toxic elements is more interesting particularly by using bacterial cells and their metabolic product. Halomonas elongata is moderately halophilic bacteria having heavy metal removal ability, normally found in hypersaline environments. ?Tetragenococcus halophilus is halophilic lactic acid bacteria and probiotic actually found in fermented food such as fish sauce, shrimp paste and fermented fish. Some scientific data reported that using T. halophilus improved amino acid profiles and desirable volatile compounds as well as reduced biogenic amine content in fish sauce product. Therefore, it was hypothesized that using H. elongata and T. halophilus can reduce heavy metal content and improve organoleptic quality of fermented fish viscera product (Tai pla) in the next experiment.