Massoud Ramona, Khosravi-Darani Kianoush, Sharifan Anoosheh, Asadi GholamHassan, Zoghi Allaleh
Department of Food Science Standard Organization Tehran Iran.
Research Department of Food Technology Faculty of Nutrition Sciences and Food Technology National Nutrition and Food Technology Research Institute Shahid Beheshti University of Medical Sciences Tehran Iran.
Food Sci Nutr. 2020 Aug 18;8(10):5284-5291. doi: 10.1002/fsn3.1825. eCollection 2020 Oct.
The food and water contamination with heavy metals is increasing due to the environmental pollutions. Lead and cadmium are the toxic heavy metals for humans that can be found in air, soil, water, and even food. Lactic acid bacteria have the ability to remove and diminish the level of heavy metals. In this study, was used to remove lead and cadmium in milk and the capability of this valuable bacterium in biosorption of these metals low concentrations (µg/L or ppb) in milk was evaluated. First, the variables on lead and cadmium removal by this bacterium have been studied by Plackett-Burman design. Then, the bioremoval process was optimized and the three main factors, the bacterium concentration, contact time, and the initial heavy metal concentration were chosen by using a central composite design. The optimum lead and cadmium bioremoval yield of 80% and 75% were observed, respectively, at 1 × 10 CFU of in milk at the 4th day and the initial ion concentration of 100 µg/L. The 3D plots analysis showed the interaction effects on metal biosorption. This study showed that is a natural effective biosorbent for lead and cadmium removal from milk.
由于环境污染，食品和水受到重金属污染的情况日益增加。铅和镉是对人类有毒的重金属，可在空气、土壤、水甚至食物中发现。乳酸菌具有去除和降低重金属水平的能力。在本研究中，使用[具体细菌名称未给出]去除牛奶中的铅和镉，并评估了这种有价值的细菌对牛奶中低浓度（微克/升或十亿分比）这些金属的生物吸附能力。首先，通过Plackett-Burman设计研究了该细菌去除铅和镉的变量。然后，通过使用中心复合设计对生物去除过程进行了优化，并选择了三个主要因素，即细菌浓度、接触时间和初始重金属浓度。在第4天牛奶中[具体细菌名称未给出]浓度为1×10[具体单位未给出]CFU且初始离子浓度为100微克/升时，分别观察到铅和镉的最佳生物去除率为80%和75%。三维图分析显示了对金属生物吸附的相互作用影响。本研究表明，[具体细菌名称未给出]是从牛奶中去除铅和镉的天然有效生物吸附剂。
