Two new C-27 steroidal: glycosides, named ophiopojaponin A(1)and B(2), were isolated from the tubers of famous traditional Chinese herb-Ophiopogon japonicus. The spectroscopic and chemical evidences revealed their str...Two new C-27 steroidal: glycosides, named ophiopojaponin A(1)and B(2), were isolated from the tubers of famous traditional Chinese herb-Ophiopogon japonicus. The spectroscopic and chemical evidences revealed their structures to be Pennogenin 3-O-[2'-O-acetyl-alpha-L-rhamnopyranosyl (1-->2)]-beta-D-xylopyranosyl (1-->3)-beta-D-glucopyranoside (1) and 26-O-beta-D-glucopyranosyl-(22 xi, 25R)-3 beta, 14 alpha, 22 xi, 26-tetrahydroxyfurost-5-ene 3-O-alpha-L-rhamnopyranosyl (1-->2)-beta-D-glucopyranoside (2), respectively.展开更多
Objective To isolate and identify the bioactive phytochemicals from the leaves of Camellia nitidissima. Methods The chemical constituents were isolated and purified by repeated silica gel, Sephadex LH-20, MCI gel colu...Objective To isolate and identify the bioactive phytochemicals from the leaves of Camellia nitidissima. Methods The chemical constituents were isolated and purified by repeated silica gel, Sephadex LH-20, MCI gel columns, recrystallization, and semi-preparative HPLC techniques. The chemicl structures of these compounds were identified on the basis of spectral data including NMR and MS. Then quorum sensing inhibition （QSI） activities of these compounds were tested using Chromobacterium violaceum CV026 as the bioindicator strain. The antitumor activities of these compounds were measured using SGC7901 as cell proliferation and cytotoxicity. Results cx-Spinasteryl-I^-D-glucopyranoside （1）, stigmasta-7,22-diene-3-O-[c^-L-arabinopyranosyl （1 -2）]-β-D-galactopyranoside （2）, kaempferol 3-O-[2-O-（trans-p-coumaroyl）-3-O-α -D-glucopyranosyl]-α-D-glucopyranoside （3）, aromadendrin （4）, catechin （5）, phlorizin 4＇-O-β-D-glucopyranoside （6）, （3R,6R,7Lg-3-hydroxy-4,7-megastigmadien- 9-one （7）, dodecanoic acid （8）, 3α-acetoxy-20-1upanol （9）, and 3β,6α- trihydroxyolean- 7-one （1 0） were successively isolated from the leaves of C. nitidissima. Unfortunately, these compounds had no QSI activity. Based on Cell Counting Kit-8 （CCK-8） assay, compound 10 showed the best anti-tumor activity or all compounds （ICs0 = 91.7 μg/mL）. Conclusion Apart from compounds 4 and 5, other eight compounds are reported in this plant for the first time. All compounds show no QSI activity, compound 10 shows potential cytotoxic activity on SGC7901 cells in vitro.展开更多
基金a key project of Chinese Academy of sciences. We are grateful to the members of Instrument Group of Phytochemistry Laboratory, K
文摘Two new C-27 steroidal: glycosides, named ophiopojaponin A(1)and B(2), were isolated from the tubers of famous traditional Chinese herb-Ophiopogon japonicus. The spectroscopic and chemical evidences revealed their structures to be Pennogenin 3-O-[2'-O-acetyl-alpha-L-rhamnopyranosyl (1-->2)]-beta-D-xylopyranosyl (1-->3)-beta-D-glucopyranoside (1) and 26-O-beta-D-glucopyranosyl-(22 xi, 25R)-3 beta, 14 alpha, 22 xi, 26-tetrahydroxyfurost-5-ene 3-O-alpha-L-rhamnopyranosyl (1-->2)-beta-D-glucopyranoside (2), respectively.
基金National High Technology Research and Development Program of China(863 Program)(2014AA022208)National Natural Science Foundation of China(31170131 and 31070312)Jiangsu Qinglan Project
文摘Objective To isolate and identify the bioactive phytochemicals from the leaves of Camellia nitidissima. Methods The chemical constituents were isolated and purified by repeated silica gel, Sephadex LH-20, MCI gel columns, recrystallization, and semi-preparative HPLC techniques. The chemicl structures of these compounds were identified on the basis of spectral data including NMR and MS. Then quorum sensing inhibition （QSI） activities of these compounds were tested using Chromobacterium violaceum CV026 as the bioindicator strain. The antitumor activities of these compounds were measured using SGC7901 as cell proliferation and cytotoxicity. Results cx-Spinasteryl-I^-D-glucopyranoside （1）, stigmasta-7,22-diene-3-O-[c^-L-arabinopyranosyl （1 -2）]-β-D-galactopyranoside （2）, kaempferol 3-O-[2-O-（trans-p-coumaroyl）-3-O-α -D-glucopyranosyl]-α-D-glucopyranoside （3）, aromadendrin （4）, catechin （5）, phlorizin 4＇-O-β-D-glucopyranoside （6）, （3R,6R,7Lg-3-hydroxy-4,7-megastigmadien- 9-one （7）, dodecanoic acid （8）, 3α-acetoxy-20-1upanol （9）, and 3β,6α- trihydroxyolean- 7-one （1 0） were successively isolated from the leaves of C. nitidissima. Unfortunately, these compounds had no QSI activity. Based on Cell Counting Kit-8 （CCK-8） assay, compound 10 showed the best anti-tumor activity or all compounds （ICs0 = 91.7 μg/mL）. Conclusion Apart from compounds 4 and 5, other eight compounds are reported in this plant for the first time. All compounds show no QSI activity, compound 10 shows potential cytotoxic activity on SGC7901 cells in vitro.
