Study on the stability of post-harvest flowers of Sophora japonica

Flowers of Sophora japonica were processed at nature conditions in Ho Chi Minh City after followed the stability within 2 years by rutin quantitative method follow Vietnamese pharmacopoeia III- 2002 by spectrophotometer and quantify quercetin by High-Perfomance Liquid Chromatography (HPLC). Results: the content of rutin in flowers of Sophora japonica decreased across preservation time (from 6 to 11%) and quercetin mixture did not increase significantly (approximate 0.1%). The rutin content of flowers of Sophora japonica was still high compared to Vietnamese pharmacopoeia III- 2002 standards. Thus, the shelf-life of the flowers of Sophora japonica is proposed to be 30 months if well preserved