Chemical constituents of Desmodium sambuense / 中国中药杂志

The chemical constituents of Desmodium sambuense were studied. Chromatographic techniques were applied to isolate and purify the constituents, and the structures were identified on the basis of physico-chemical and spectroscopeic methods. Thirteen compounds were isolated from the 75% ethanol extract of Desmodium sambuens and elucidated as beta-amyrin(1), betulic acid(2), daucosterol(3), triacontanoic acid(4), lup-20(29)-en-3-one(5), tetracosanoic-2,3-dihydroxypropylester(6), stigmast-5-ene-3beta, 7alpha-ol (7),methyl phaeophorbidea(8), o-hydroxy benzoic acid(9),beta-sitosterol(10),d-catechin(11), luteolin (12), epigallocatechin (13). All of the compounds were isolated from this plant for the first time.

Chemical constituents and bioactivity of Teucrium pilosum / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents and bioactivity of Teurium pilosum.</p><p><b>METHOD</b>Various column chromatographic techniques were used to isolate the constituents. A combination of EI-MS, NMR spectroscopy and X-Ray were applied to identify the structures. The anti-microorganism was accomplished by disk diffusion method, the antioxidant activity was assayed by the DPPH microanalysis models and the inhibitory activity of alpha-glucosidase was screened In vitro.</p><p><b>RESULT</b>Eight compounds were isolated and identified as: glyceryl tristearate (1), 2,5-dioxolanone (2), fernenol (3), stigmasta-5,22-dien-3P-ol (4), 24-nor cholesta-5,22 (E)-dien-3beta-ol (5), ca-spinasterol (6), (3,4-dihydroxyphenyl) acrylate (7), 3,4-dihydroxy phenyl acrylic acid (8).</p><p><b>CONCLUSION</b>All compounds have been isolated from the genus for the first time. Compound 3 [IC50 = (37.63 +/- 3.45) mg +/- L(-1)], 6 [IC50 = (178.92 +/- 4.99) mg x L(-1)] and 8 [IC50 = (44.32 +/- 7.02) mg x L(-1)] are of higher inhibitory alpha-glucosidase activity than that of acarbose [IC50 = (1081.27 +/- 12.3) mg x L(-1)]. Compound7 [IC50 = (4.81 +/- 0.96) mg x L(-1)] and 8 [IC50 = (4.16 +/- 0.11) mg L(-1)] showed higher antioxidant activity than that of BHT [IC50 = (35.64 +/- 0.36) mg x L(-1)] and BHA [IC50 = (8.74 +/- 0.39) mg x L(-1)]. Compound 5-8 exhibited inhibitory activity against Fusarium graminearum. Compound 5 and 8 showed inhibitory activity against Botrytis cinerea.</p>