53963-43-2Relevant articles and documents
Characterization of metabolism and in vitro permeability study of notoginsenoside R1 from radix notoginseng
Ruan, Jian-Qing,Leong, Weng-Im,Yan, Ru,Wang, Yi-Tao
experimental part, p. 5770 - 5776 (2011/08/05)
As a main and characteristic constituent in Radix notoginseng, the fate of notoginsenoside R1 (NGR1) in human is largely unknown. The present study investigated, for the first time, NGR1 metabolism by human intestinal bacteria and liver subcellular fractions, and permeability properties of NGR1 and resultant metabolites on a Caco-2 model. Samples were qualitatively analyzed using HPLC-MS/MS and quantitatively determined using HPLC-UV. When incubated with pooled human intestinal bacteria anaerobically, NGR1 showed biphasic elimination: an insignificant decrease in the first 8 h followed by a rapid elimination during 8-48 h. Four metabolites, three unambiguously identified as ginsenosides Rg1, F1 and 20(S)-protopanaxatriol formed via stepwise deglycosylation, and one tentatively assigned as a dehydrogenated protopanaxatriol with transformation occurring at the tetracyclic triterpenoid skeleton, were produced sequentially. Rg1 and F1 were formed transiently at low apparent velocities, while 20(S)-protopanaxatriol was the major metabolite with a formation rate close to the rate of NGR1 elimination and a low elimination rate. NGR1 remained intact in human liver S9 or microsomes over 1 h. Transport study of NGR1 and its metabolites revealed an ascending permeability order with stepwise deglycosylation. Taken together, the results revealed a determinant role of intestinal bacteria in the overall disposition and potential bioactivity of NGR1 in human.
Enzymatic preparation of ginsenosides Rg2, Rh1, and F1 from protopanaxatriol-type ginseng saponin mixture
Ko, Sung-Ryong,Choi, Kang-Ju,Uchida, Kei,Suzuki, Yukio
, p. 285 - 286 (2007/10/03)
During investigations on the hydrolysis of a protopanaxatriol-type saponin mixture by various glycoside hydrolases, it was found that two minor saponins, ginsenosides Rg2 and Rh1, were formed in high yields by crude β-galactosidase from Aspergillus oryzae and crude lactase from Penicillium sp., respectively. Moreover, a crude preparation of naringinase from Penicillium decumbens readily hydrolyzed a protopanaxatriol-type saponin mixture to give an intestinal bacterial metabolite, ginsenoside F1 as the main product. A crude preparation of hesperidinase from Penicillium sp. selectively hydrolyzed ginsenoside Re into ginsenoside Rg1. This is the first report on the enzymatic preparation of minor saponins, ginsenosides Rg2 and Rh1, and of an intestinal bacterial metabolite, ginsenoside F1, with a high efficiency from a protopanaxatriol-type saponin mixture.