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Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
Published on: July 5, 2017
Steroids and flavonoids from Physalis alkekengi var. franchetii and their inhibitory effects on nitric oxide
Li Qiu1, Feng Zhao, Zhi-Hu Jiang
1Department of Natural Products Chemistry, School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University 81#, No. 103 Road WenHua, Shenyang 110016, People's Republic of China.
Abstract:
Four new steroidal compounds possessing a rare 13,14-seco-16,24-cycloergostane skeleton, physalin Y ( 1), physalin Z ( 2), physalin I ( 6), and physalin II ( 7), were isolated from the 80% EtOH extract of calyces from Physalis alkekengi var. franchetii together with 11 known steroids ( 3- 5 and 8- 15) and eight flavonoids ( 16- 23). The structures of the new compounds were elucidated primarily on the basis of 1D and 2D NMR and mass spectroscopic studies. The relative configuration of the 3-OH group of 3, 4, and 5 was also established or re-established. The inhibitory effects of compounds 1- 23 on nitric oxide production in lipopolysaccaride-activated macrophages were evaluated.
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