为获得‘雀嘴茶’中乌金苷(6′-O-caffioylarbutin,CA)、绿原酸(3′-O-caffeoylquinic acid,CGA)和熊果苷(arbutin,Arb)3种主效成分高保留的干燥方法,该研究采用热风干燥(hot air drying,HAD)、真空冷冻干燥(freeze vacuum drying,FVD)...
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为获得‘雀嘴茶’中乌金苷(6′-O-caffioylarbutin,CA)、绿原酸(3′-O-caffeoylquinic acid,CGA)和熊果苷(arbutin,Arb)3种主效成分高保留的干燥方法,该研究采用热风干燥(hot air drying,HAD)、真空冷冻干燥(freeze vacuum drying,FVD)、真空干燥(vacuum drying,VD)、日晒干燥(sun drying,SD)、微波干燥(microware drying,MD)、自然阴干(natural air drying,NAD)、煮制阴干(boiling and natural air drying,B-NAD)、蒸制阴干(steaming and natural air drying,S-NAD)和烫制阴干(quick-boiling and natural air drying,QB-NAD)9种干燥方法对樟叶越桔叶芽进行干燥处理,并利用HPLC建立3种主效成分含量分析方法。进一步设置6个不同预处理时间对创新方法S-NAD、QB-NAD和B-NAD进行了优化试验。结果显示,9种干燥方法获得的3种主效成分含量均表现出CA>CGA>Arb。S-NAD是CA和CGA含量最高保留的干燥方法,分别高达428.726 mg/g和13.213 mg/g,VD是Arb含量最高保留的干燥方法,高达16.054 mg/g,S-NAD法也可得到较高的Arb含量(11.815 mg/g)。3种创新干燥方法的最佳预处理时间分别为S-NAD蒸制5 min、QB-NAD烫制和B-NAD煮制均为1 min。因此,干燥方法显著影响‘雀嘴茶’3种主效成分的保留含量,但3种主效成分含量高低顺序不受干燥方法的影响。为同时实现‘雀嘴茶’3种主效成分高保留,S-NAD是最适的干燥方法,且蒸制预处理5 min最佳。
Two new ent-kauranoids, tenuifolin A (3beta,6alpha, 15beta-trihydroxy-1alpha, 7beta-diacetoxy-11beta, 16beta-epoxy-ent-kaurane) (1) and tenuifolin B (1alpha,6alpha, 11beta-trihydroxy-3beta,7beta-diacetoxy-ent-kaur-16-...
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Two new ent-kauranoids, tenuifolin A (3beta,6alpha, 15beta-trihydroxy-1alpha, 7beta-diacetoxy-11beta, 16beta-epoxy-ent-kaurane) (1) and tenuifolin B (1alpha,6alpha, 11beta-trihydroxy-3beta,7beta-diacetoxy-ent-kaur-16-en-15-one) (2), together with four known compounds were isolated from the aerial parts of Isodon tenuifolia (W. W. Smith) Kudo collected from Zhongdian County, Yunnan Province, China. Their structures were determined by the spectral methods (including 2D NMR techniques).
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