Abstract
Pueraria candollei var. mirifica or White Kwao Krua (WKK) is a phytoestrogen-rich plant widely used among women to improve climacteric symptoms. Additionally, the tuberous roots of this plant have been added as an active ingredient for skin rejuvenation and breast enlargement effects in various functional foods. However, most of the products on the market containing WKK have not been sufficiently standardized with respect to the active compound or identical marker. To control the quality of these plant materials, an enzyme-linked immunosorbent assay (ELISA) using anti-isomiroestrol antibodies was established for the determination of isomiroestrol, an identical marker in WKK. Polyclonal and monoclonal antibodies against isomiroestrol were generated and their specificity characterized in this study. Monoclonal antibody 12C1 showed higher specificity to isomiroestrol and was thus selected to develop the ELISA. Based on the validation analysis and the tested performance of the developed ELISA in variably sourced WKK samples, the assay can provide an alternative approach that is reliable and highly sensitive for the quantitative analysis of isomiroestrol in plant.
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