Biotin-avidin amplified enzyme-linked immunosorbent assay for determination of isoflavone daidzein |
| |
Authors: | He Jian-Tao Shi Zhi-Hong Yan Jin Zhao Mei-Ping Guo Zhen-Quan Chang Wen-Bao |
| |
Institution: | a The Key Laboratory of Bioorganic Chemistry and Molecular Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China b College of Life Sciences, Peking University, Beijing 100871, PR China |
| |
Abstract: | A biotin-avidin amplified enzyme-linked immunosorbent assay (BA-ELISA) method was developed and optimized for the determination of a weakly estrogenic isoflavone daidzein in serum, urine and Puerariae radix. Specific polyclonal antibody was produced against daidzein by immunization of rabbits with a conjugate of 7-O-(carboxymethyl)-daidzein and bovine serum albumin (BSA). The polyclonal antibody showed specific recognition of daidzein, while cross-reactivities to coumarin, 4-hydroxycoumarin, phenol, and other isoflavones such as puerarin and rutin were all lower than 1%. The linear range of daidzein calibration curve was 0.1-1000 ng mL−1. The detection limit was found to be 0.04 ng mL−1, and the intra-assay and inter-assay coefficients of variation were 7 and 16%, respectively. Human serum and urine samples were spiked with known amounts of daidzein and measured by the established BA-ELISA. Recoveries were between 91 and 107%. Daidzein in P. radix was determined by the BA-ELISA method and HPLC method, and the content of daidzein was determined to be 0.0219 and 0.0194%, respectively. The results indicated that there was a good agreement between the two methods. The established method is very useful for monitoring daidzein in biological samples and traditional Chinese medicine. |
| |
Keywords: | Daidzein Polyclonal antibody Biotin-avidin amplified ELISA Serum sample Urine sample Puerariae radix |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|