Open AccessA Microbial Fermentation of Soybean and Cottonseed Meal Increases Antioxidant Activity and Gossypol Detoxification in Diets for Nile tilapia, Oreochromis niloticus
Author(s) -
Lim SeJin,
Lee KyeongJun
Publication year - 2011
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.2011.00491.x
Subject(s) - oreochromis , gossypol , cottonseed meal , biology , fermentation , food science , hibiscus sabdariffa , nile tilapia , aspergillus oryzae , soybean meal , fish meal , dpph , antioxidant , cottonseed , microbiology and biotechnology , biochemistry , fish <actinopterygii> , fishery , ecology , raw material
We report the beneficial effects of a microbial fermentation process of plant protein sources. To reduce anti‐nutritional factors, soybean meal (SM) and cottonseed meal (CM) were fermented with Aspergillus oryzae , a probiotic microorganism, and a 12‐wk feeding study was conducted to evaluate the supplemental effects of the fermented soybean meal (FSM) or fermented cottonseed meal (FCM) in diets for juvenile Nile tilapia. Growth performance and hematological parameters were not influenced by the fermentation process, while the highest inclusion of both FSM and FCM lowered feed utilization efficiency. The microbial fermentation significantly increased dietary total polyphenols and consequently led to higher 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH) radical scavenging activities in both diets and fish tissue. Dietary and liver gossypol concentrations were significantly decreased by the fermentation process of CM. The findings suggest that microbial fermentation of SM or CM with A. oryzae can enhance antioxidant activities in diets and fish, and effectively reduce or degrade the toxicity of gossypol present in CM. A microbial fermentation could make plant protein sources more useful and functional in feeds for fish.