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Rafael Herrera Alvarez,Fabio Luis Nogueira Natal,Maria Teresa Carvalho Pinto Ribela,Beatriz Elane de Almeida,João Ezequiel de Oliveira,Paolo Bartolini 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.4
Ovarian stimulation with commercial preparations of equine chorionic gonadotropin (eCG) produces extremely variable responses indomestic animals, ranging from excessive stimulation to practically no stimulation, when applied on the basis of their declared unitage. Thisstudy was conducted to analyze four commercial preparations from different manufacturers via reversed-phase HPLC (RP-HPLC) incomparison with a reference preparation and an official International Standard from the World Health Organization. The peaks obtained bythis qualitative and quantitative physical–chemical analysis were compared using an in vivo bioassay based on the ovarian weight gain ofprepubertal female rats. The RP-HPLC data showed one or two peaks close to a main peak (tR = 27.9 min), which were related to the in vivobioactivity. Commercial preparations that have this altered peak showed very little or no in vivo activity, as demonstrated by rat ovarian weightand in peripubertal gilts induced to ovulate. Overall, these findings indicate that RP-HPLC can be a rapid and reliable tool to reveal changesin the physicochemical profile of commercial eCG that is apparently related to decreased biological activity of this hormone.