Laboratory of Food Chemistry and Nutrition, College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China.
Bioresour Technol. 2013 Sep;143:46-52. doi: 10.1016/j.biortech.2013.05.114. Epub 2013 Jun 4.
Application of microorganisms as bioremediators for heavy metal removal in high salt environment is usually restricted by high salt concentrations. The effect of NaCl on the heavy metal tolerance and bioaccumulation of Zygosaccharomyces rouxii and Saccharomyces cerevisiae was investigated. For both yeasts, NaCl improved the cadmium and zinc tolerance, reduced the copper tolerance, and showed no obvious effect on the lead and iron tolerance. The bioaccumulation capacities of copper, zinc, and iron increased but the cadmium bioaccumulation capacities decreased after the addition of NaCl. NaCl obviously affected the amount of heavy metals removed intracellularly and on the cell surface. The heavy metal removal was not overwhelmingly inhibited by elevated NaCl concentrations, especially for Z. rouxii, and in some cases NaCl improved their removal ability. The salt-tolerant Z. rouxii that showed more powerful heavy metal tolerance and removal ability might be more suitable for heavy metal removal in high salt environment.
应用微生物作为生物修复剂去除高盐环境中的重金属通常受到高盐浓度的限制。本研究考察了 NaCl 对鲁氏酵母（Zygosaccharomyces rouxii）和酿酒酵母（Saccharomyces cerevisiae）耐重金属和生物累积的影响。对于这两种酵母，NaCl 提高了镉和锌的耐受性，降低了铜的耐受性，而对铅和铁的耐受性没有明显影响。NaCl 的添加增加了铜、锌和铁的生物累积能力，但降低了镉的生物累积能力。NaCl 明显影响了重金属在细胞内和细胞表面的去除量。高 NaCl 浓度并没有完全抑制重金属的去除，尤其是对鲁氏酵母而言，在某些情况下，NaCl 还提高了它们的去除能力。具有更强耐重金属能力和去除能力的耐盐鲁氏酵母可能更适合在高盐环境中去除重金属。
