柠檬酸和琥珀酸提取牡蛎匀浆液中镉的研究  

Study on the extraction of cadmium from Oyster homogenate by succinic acid and citric acid

作　　者：吴晓萍[1] 廖艳[2] 章超桦[1] 徐慧[1] 

机构地区：[1]广东海洋大学食品科技学院,广东湛江524088 [2]广东海洋大学现代生化中心,广东湛江524088

出　　处：《上海海洋大学学报》2011年第3期462-467,共6页Journal of Shanghai Ocean University

基　　金：农业部"948"项目(2006-G42);广东省科厅农业攻关项目(2010B020313005)

摘　　要：以琥珀酸和柠檬酸提取牡蛎匀浆液中的镉,并利用单因素试验和正交试验优化提取条件。结果表明,有机酸的pH对牡蛎匀浆液中镉的提取率影响最大,其次是料液比和时间。浓度和温度的影响因有机酸类型不同而有差异。琥珀酸提取镉的最佳条件如下：时间为2 h,温度为35℃,酸浓度为0.02 mol/L,料液比为1∶15,pH为2.0;柠檬酸提取镉的最佳条件如下：时间为2 h,温度为35℃,酸浓度为0.04 mol/L,料液比为1∶15,pH为2.5。在最佳条件下两种有机酸对牡蛎匀浆液中镉的提取率达到90.2%~91.8%。研究亮点：目前利用有机酸等螯合剂去除土壤、底泥中的重金属等已做了大量研究,而直接对生物原料进行镉的提取尚未见报道。首次以琥珀酸和柠檬酸为提取剂直接对牡蛎匀浆液进行浸提,重金属镉的提取率超过90%,结果显示此两种有机酸是较为理想的镉提取剂,为生物原料中镉的去除开辟了新的途径。The optimum conditions for the extraction of cadmium from Oyster homogenate by succinic acid and citric acid were determined using single facter and orthogonal array design methodology.The results showed that the pH value of organic acid has the maximal effect on extraction rate of cadmium in Oyster homogenate,followed by material-liquid ratio and extraction time.The effects of concentration and temperature on extraction rate were found to be slightly dependent on the type of organic acid.The optimal conditions to obtain the highest extraction rate by succinic acid and citric acid were 2 h,35 ℃,pH 3.0,0.02 mol/L of sucinic acid and 1∶15 of material to solution,as well as 2 h,35 ℃,pH 2.5,0.04 mol/L of citric acid and 1∶15 of material to liquid,respectively.Under these optimal conditions,extraction rate of cadmium from Oyster homogenate by the two organic acids reached up to 90.2%-91.8%.

关 键 词：柠檬酸 琥珀酸 镉 提取 牡蛎 

分 类 号：S912[农业科学—水产科学]