| 快速定量分析牛乳中α-乳白蛋白的竞争酶联免疫吸附法 |
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| 作者姓名： | 宋宏新 程妮 薛海燕 杜枘宣 |
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| 作者单位： | 陕西科技大学食品与生物工程学院, 西安 710021 |
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| 基金项目： | 陕西省科技统筹创新工程计划项目(2013KTCQ02-09)资助 |
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| 摘 要： | 建立一种灵敏度高和特异性好的直接竞争ELISA法来定性和定量检测牛乳中α-乳白蛋白(α-LA).通过使用牛乳α-LA多次免疫新西兰大白兔制备多克隆抗体,并采用过碘酸钠氧化法制备辣根过氧化物酶(HRP)标记的α-LA,建立检测α-LA的直接竞争ELISA法.所制备的多克隆抗体特异性较高,无明显交叉反应,效价为1:80 920.酶标抗原的标记率达66.67%.直接竞争ELISA法标准曲线相关系数为0.998 57,回收率在86.00%~117.50%之间,重复性高,变异系数<5%.与国标电泳方法进行样品检测比较,结果显示该方法可有效地用于食品中α-LA的快速定性和定量检测.
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| 关 键 词： | 定量分析 蛋白质 竞争酶联免疫吸附实验 α-乳白蛋白 免疫试验 |
| 收稿时间： | 2015-10-08 |
| 修稿时间： | 2016-03-01 |
Competitive enzyme-linked immunosorbent assay for rapid quantitative analysis of α-lactalbumin in bovine milk |
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| Authors: | SONG Hongxin CHENG Ni XUE Haiyan DU Ruixuan |
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| Institution: | School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China |
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| Abstract: | A sensitive and specific competitive enzyme-linked immunosorbent assay (cELISA) for qualitative and quantitative analysis of α-lactalbumin (α-LA) is described. New Zealand white rabbits were immunised to obtain α-LA PcAb. By using sodium periodate oxidative method,the α-LA labeled by horseradish peroxidase (HRP) was prepared. Then cELISA was developed for α-LA quantitative analyses. The prepared PcAb has high specificity without obvious cross-reactivity and its titer is 1:80 920. The labeling rate of the enzyme-labeled antigen is 66.67%. The correlation coefficient of the established cELISA was 0.998 57, and the recoveries were estimated to be in the range from 86.00% to 117.50%. The variation coefficient is less than 5%. Compared with the national standard electrophoresis method,the established cELISA was useful analytical tool for rapid qualitative and quantitative analysis of α-LA in food samples. |
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| Keywords: | quantitative analysis proteins cELISA α-lactalbumin immunization |
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