Zhao Fang, Zhang Hu, Yan Pianpian, Chen Yuwei, Wu Qian, Fang Min, Wu Yongning, Gong Zhiyong
Key Laboratory for Deep Processing of Major Grain and Oil of Ministry of Education Wuhan Polytechnic University Wuhan China.
NHC Key Laboratory of Food Safety Risk Assessment Food Safety Research Unit (2019RU014) of Chinese Academy of Medical Science China National Center for Food Safety Risk Assessment Beijing China.
Food Sci Nutr. 2021 Jun 25;9(8):4509-4516. doi: 10.1002/fsn3.2427. eCollection 2021 Aug.
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 (. ) 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 . 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.
中国是世界上水稻产量最高的国家，但水稻重金属污染问题日益严重。本研究考察了一种微生物固定化方法去除米粉中的镉（Cd）。研究表明，（.）表现出最佳的去除效果，但微生物难以从米粉中分离出来。采用海藻酸钠（SA，3%）、聚乙烯醇（PVA，2%）和硅藻土（DE，1%）共固定化（.）制备了硅藻土共固定化微生物颗粒（DECIMPs）。与微生物发酵相比，固定化颗粒对大米品质的影响较小，样品1（0.459±0.006mg/kg）和样品2（0.873±0.031mg/kg）的Cd去除率分别达到90.01%±1.01%（0.051±0.003mg/kg）和91.80%±0.54%（0.068±0.034mg/kg），显著高于游离微生物发酵。此外，微生物易于分离。这些结果表明，DECIMPs发酵是去除大米中Cd的有效手段，可被视为开发无Cd大米食品的一种策略。
