Open AccessSynthesis of coimmobilized microorganisms for the removal of cadmium from cadmium‐contaminated rice flour
Author(s) -
Zhao Fang,
Zhang Hu,
Yan Pianpian,
Chen Yuwei,
Wu Qian,
Fang Min,
Wu Yongning,
Gong Zhiyong
Publication year - 2021
Publication title -
food science and nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 27
ISSN - 2048-7177
DOI - 10.1002/fsn3.2427
Subject(s) - fermentation , lactobacillus plantarum , cadmium , food science , chemistry , microorganism , pellets , sodium alginate , pulp and paper industry , biology , bacteria , sodium , lactic acid , paleontology , organic chemistry , genetics , engineering
China has the greatest rice production in the world, but the problem of heavy metal pollution in rice is becoming increasingly serious. The present study examined a microbial immobilization method to remove cadmium (Cd) in rice flour. The study demonstrated that Lactobacillus plantarum ( L . plantarum ) exhibited the best removal effect, but the microorganisms were difficult to separate from rice flour. Diatomaceous earth coimmobilized microbial pellets (DECIMPs) were prepared using coimmobilized L . plantarum with sodium alginate (SA, 3%), polyvinyl alcohol (PVA, 2%), and diatomaceous earth (DE, 1%). Compared with microbial fermentation, the immobilized pellets had less influence on rice quality, and Cd removal rates of sample 1 (0.459 ± 0.006 mg/kg) and 2 (0.873 ± 0.031 mg/kg) reached 90.01% ± 1.01% (0.051 ± 0.003 mg/kg) and 91.80% ± 0.54% (0.068 ± 0.034 mg/kg), which were significantly higher than free microbial fermentation. In addition, microbial was easily separated. These results show that DECIMPs fermentation is an effective means of removing Cd from rice and could be considered as a strategy for the development of Cd‐free rice‐based foods.