目的从木立芦荟(Aloe arborescens)中寻找新的BACE(β-分泌酶)抑制活性成分。方法用硅胶正相色谱及反相色谱技术进行活性成分的分离纯化,根据理化性质、光谱资料进行结构鉴定。结果从木立芦荟95%乙醇提取物的乙酸乙酯部分和正丁醇部分,...目的从木立芦荟(Aloe arborescens)中寻找新的BACE(β-分泌酶)抑制活性成分。方法用硅胶正相色谱及反相色谱技术进行活性成分的分离纯化,根据理化性质、光谱资料进行结构鉴定。结果从木立芦荟95%乙醇提取物的乙酸乙酯部分和正丁醇部分,分离得到了8个化合物:异丁酰基芦荟宁A(1),芦荟宁A(2),芦荟大黄素(3),(E)-2-acetonyl-8-(2′-O-feru loxyl)-β-D-glucopyranosyl-7-m ethoxy-5-m ethyl-chromone(4),7-O-m ethyl aloeresin A(5),芦荟苷A(6),elgon ica-d im er A(7)和elgon ica-d im er B(8)。结论化合物1为新化合物,化合物4为首次从该植物中分离得到。活性测试结果表明,化合物2,4,5,6对BACE有一定的抑制活性。展开更多
光动力学疗法(photodynamic therapy,PDT)具有良好的靶向性、微创性和安全性,已成为肿瘤防治中的重要领域,而光敏剂(photosensitizer)则是PDT的核心和关键。本文报道了一种用于卟啉类光敏剂的新HPLC分析方法,采用Shiseido Capcell PAK C...光动力学疗法(photodynamic therapy,PDT)具有良好的靶向性、微创性和安全性,已成为肿瘤防治中的重要领域,而光敏剂(photosensitizer)则是PDT的核心和关键。本文报道了一种用于卟啉类光敏剂的新HPLC分析方法,采用Shiseido Capcell PAK C18(150 mm×4.6 mm,5μm)色谱柱,柱温30℃,甲醇-1%冰乙酸溶液为流动相,流速1.0 m L·min-1,梯度洗脱,检测波长380 nm。方法学研究表明本方法具有良好的专属性、精密度、准确度和重复性,适用于卟啉类光敏剂的纯度检查和含量测定,已在新型光敏剂华卟啉钠的开发中发挥了重要导向作用。展开更多
Two new stilbenoids, cis-e-viniferin (3) and 2b,14b-dehydro-bisresveratrol (4) were synthesized by photooxida-tion reaction of trans-e-viniferin (2) prepared from trans-resveratrol (1). Pentamethoxyl trans-e-viniferin...Two new stilbenoids, cis-e-viniferin (3) and 2b,14b-dehydro-bisresveratrol (4) were synthesized by photooxida-tion reaction of trans-e-viniferin (2) prepared from trans-resveratrol (1). Pentamethoxyl trans-e-viniferin (5) and pentamethoxyl cis-e-viniferin (6) were also obtained by methylation of trans-e-viniferin (2) with (MeO)2SO2. Their structures were elucidated on the basis of spectral evidence. Compounds 3 and 4 showed potent inhibition of TNF-a at concentrations of 10-5 molL-1 with inhibitory ratios of 51.43% and 36.64%, respectively.展开更多
文摘目的从木立芦荟(Aloe arborescens)中寻找新的BACE(β-分泌酶)抑制活性成分。方法用硅胶正相色谱及反相色谱技术进行活性成分的分离纯化,根据理化性质、光谱资料进行结构鉴定。结果从木立芦荟95%乙醇提取物的乙酸乙酯部分和正丁醇部分,分离得到了8个化合物:异丁酰基芦荟宁A(1),芦荟宁A(2),芦荟大黄素(3),(E)-2-acetonyl-8-(2′-O-feru loxyl)-β-D-glucopyranosyl-7-m ethoxy-5-m ethyl-chromone(4),7-O-m ethyl aloeresin A(5),芦荟苷A(6),elgon ica-d im er A(7)和elgon ica-d im er B(8)。结论化合物1为新化合物,化合物4为首次从该植物中分离得到。活性测试结果表明,化合物2,4,5,6对BACE有一定的抑制活性。
文摘光动力学疗法(photodynamic therapy,PDT)具有良好的靶向性、微创性和安全性,已成为肿瘤防治中的重要领域,而光敏剂(photosensitizer)则是PDT的核心和关键。本文报道了一种用于卟啉类光敏剂的新HPLC分析方法,采用Shiseido Capcell PAK C18(150 mm×4.6 mm,5μm)色谱柱,柱温30℃,甲醇-1%冰乙酸溶液为流动相,流速1.0 m L·min-1,梯度洗脱,检测波长380 nm。方法学研究表明本方法具有良好的专属性、精密度、准确度和重复性,适用于卟啉类光敏剂的纯度检查和含量测定,已在新型光敏剂华卟啉钠的开发中发挥了重要导向作用。
基金Project supported by the National Natural Science Foundation of China (No. 30070889).
文摘Two new stilbenoids, cis-e-viniferin (3) and 2b,14b-dehydro-bisresveratrol (4) were synthesized by photooxida-tion reaction of trans-e-viniferin (2) prepared from trans-resveratrol (1). Pentamethoxyl trans-e-viniferin (5) and pentamethoxyl cis-e-viniferin (6) were also obtained by methylation of trans-e-viniferin (2) with (MeO)2SO2. Their structures were elucidated on the basis of spectral evidence. Compounds 3 and 4 showed potent inhibition of TNF-a at concentrations of 10-5 molL-1 with inhibitory ratios of 51.43% and 36.64%, respectively.