scholarly journals Analytical Methods for Characterizing Bioactive Terpene Lactones in Ginkgo Biloba Extracts and Performing Pharmacokinetic Studies in Animal and Human

Author(s):  
Rossana Rossi ◽  
Fabrizio Basilico ◽  
Antonella De ◽  
Pierluigi Mauri



Xenobiotica ◽  
2021 ◽  
pp. 1-9
Author(s):  
Jadera Talap ◽  
Zhuowei Shen ◽  
Jing Nie ◽  
Jie Pan ◽  
Mingcheng Xu ◽  
...  


2004 ◽  
Vol 82 (1) ◽  
pp. 57-64 ◽  
Author(s):  
I fan Kuo ◽  
Jie Chen ◽  
Thomas K.H Chang

The present study investigated the in vitro effect of Ginkgo biloba extracts and some of the individual constituents (ginkgolides, bilobalide, and flavonols such as kaempferol, quercetin, isorhamnetin, and their glycosides) on CYP1A-mediated 7-ethoxyresorufin O-dealkylation in hepatic microsomes isolated from rats induced with β-naphthoflavone. G. biloba extract competitively inhibited CYP1A activity, with an apparent Ki value of 1.6 ± 0.4 µg/mL (mean ± SE). At the concentrations present in the G. biloba extracts, ginkgolides A, B, C, and J and bilobalide did not affect CYP1A activity, whereas kaempferol (IC50 = 0.006 ± 0.001 µg/mL, mean ± SE), isorhamnetin (0.007 ± 0.001 µg/mL), and quercetin (0.050 ± 0.003 µg/mL) decreased this activity. The monoglycosides (1 and 10 µg/mL) and diglycosides (10 µg/mL) of kaempferol and quercetin but not those of isorhamnetin also inhibited CYP1A activity. The order of inhibitory potency was kaempferol ~ isorhamnetin > quercetin, and for each of these flavonols the order of potency was aglycone >> monoglycoside > diglycoside. In summary, G. biloba extract competitively inhibited rat hepatic microsomal CYP1A activity, but the effect was not due to ginkgolides A, B, C, or J, bilobalide, kaempferol, quercetin, isorhamnetin, or the respective flavonol monoglycosides or diglycosides.Key words: bilobalide, CYP1A, cytochrome P450, Ginkgo biloba, ginkgolide, flavonol.



2018 ◽  
Vol 15 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Zhiming Shu ◽  
Akhtar Hussain Sh ◽  
Mohamed Shahen ◽  
He Wang ◽  
Mahmoud Alagawany ◽  
...  




2004 ◽  
Vol 45 (6) ◽  
pp. 295-301 ◽  
Author(s):  
Tomomi SUGIYAMA ◽  
Kazumasa SHINOZUKA ◽  
Atsushi SANO ◽  
Shizuo YAMADA ◽  
Kaori ENDOH ◽  
...  


2010 ◽  
Vol 66 (5) ◽  
pp. 503-509 ◽  
Author(s):  
Xiao-Cong Zuo ◽  
Bi-Kui Zhang ◽  
Su-Jie Jia ◽  
Shi-Kun Liu ◽  
Ling-Yun Zhou ◽  
...  


2018 ◽  
Vol 6 (4) ◽  
pp. 765-772 ◽  
Author(s):  
Xiaobing Xu ◽  
Shangwei Guo ◽  
Xianghui Hao ◽  
Hui Ma ◽  
Yanping Bai ◽  
...  


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