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        The Radio-Immunoassay Method for Ginsenoside Rg<sub>1</sub> of Korean Ginseng

        Byung Hoon Han,Yong Nam Han,Ushio sankawa,Minko Akyama,Koichiro Kawashima 한국생약학회 1980 생약학회지 Vol.11 No.3

        In order to develop the radio-immunoassay procedure for the ginsenoside Rg₁, we prepared the Rg₁-BSA conjugate and Rg₁-tyramine conjugate by condensing the Rg₁-azide, which was prepared by a series of six step chemical modification of the Rg₁-side chain, with bovine serum albumin(BSA) or with tyramine. Rabbits were immunized by repeated injection of Rg₁-BSA conjugate with Freund`s Complete Adjuvant for 5 month long to obtain very potent anti-Rg₁ serum. The radio-labelled haptene was prepared by direct radio-iodination (125_J) of Rg₁-tyramine according to the chloramine-T method. The radio-immunoassay procedure was successfully furnished by using DCC method (dextran coated charcoal) and the anti-body titer of the anti-serum was found as being 1600∼3200 by using 15000cpm tracer per test. Calibration test using non-labelled Rg₁ showed linear competetive binding response in the (8-300)×34pg. range of non-labelled Rg₁. The cross reaction test using 19 ginsenoside analogues enabled us a full structure-activity analysis on the antigen-antibody reaction that the anti-body in the serum would recognize the full structure of ginsenoside Rg₁ except the side chain moiety.

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