羧基在酵母菌生物吸附铅时的作用

用不同方法研究了酵母菌吸附重金属的机理.电位滴定法的结果说明生物材料含有0.5 mmol/g的酸性基团;酯化后的酵母菌对重金属的吸附量显著下降.对酯化前后的生物材料的红外光谱进行了比较,1 744 cm-1的吸收峰强度的增加证明酵母菌发生了酯化过程.羧基在酵母菌结合铅时起重要作用.

Contribution of Carboxylate Groups to Lead Biosorption by Yeast

The mechanism of heavy metal sorption by Beer yeast is investigated using different techniques. Potentiometric titration gives some information concerning the acidic groups in the biomass(0.5 mmol/g dry biomass). The esterification of carboxylate functionalities presented in the cell walls of yeast results in a marked decrease in lead uptake. Both the native material and the esterified product are examined via infrared spectroscopy. A peak at 1 744 cm -1 (attributed to the carboxylate stretching) confirms the esterification process. Carboxylate group plays a great role in lead biosorption by Beer yeast.