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Forced Degradation of flavonol glycosides Extraced from ginkgo biloba

Chemical Research in Chinese Universities 2013年第4期29卷 667-670页

作者： JIN Ye ZHANG Wei-yu MENG Qing-fan LI Dan-hui GARG Sajay TENG Li-rong WEN Jlng-yuan College of Life Science Jilin University Changchun 130012 P. R. China School of Pharmacy Faculty of Medical and Health Sciences University of Auckland 1010 Auckland New Zealand School of Pharmacy Changchun University of Chinese Medicine Changchun 130117 P R. China School of Pharmacy and Medical Sciences University of South Australia Adelaide South Australia 5001. Australia

The degradation of flavonol glycosides extracted from ginkgo biloba was performed under different conditions and the degraded products were determined by reversed-phase high performance liquid chromatography （RP-HPLC） *** stress conditions including acid（0.1 mol/L HCl）,base（0.1 mol/L NaOH）,temperature （70 ℃） and oxidation（0.03% H2O2,volume fraction） were used for the forced degradation *** pH stabilities of the flavonol glycosides were determined in phosphate buffers of varying pH values from 4.5 to *** degradation rate constants and half-life of three ginkgo flavonol aglycones（quercetin,kaempferol and isorhamnetin） which represent ginkgo flavonol glycosides were calculated in forced degradation and pH-stability studies of *** resuits indicate that the three substances were more stable when incubated under acid condition and showed pH-dependent *** degradation was observed to follow first-order kinetics in all degradation *** stability results could provide important bases on development,preparation and storage of products of ginkgo biloba extract and should be significantly considered during the further formulation development.

关键词： ginkgo flavonol glycoside Degradation pH-Stability Degradation rate constant

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