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Combination of Pretreatments with Acetic Acid and Sodium Methoxide for Efficient Digoxin Preparation from Digitalis Glycosides in Digitalis lanata Leaves
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作者 Yasuhiko Higashi Yukari Ikeda Youichi Fujii 《Pharmacology & Pharmacy》 2016年第5期200-207,共8页
We previously developed an HPLC method for determination of lanatoside C, digoxin and α-acetyldigoxin in digitalis glycosides isolated from Digitalis lanata leaves. Here, we present an improved HPLC-UV method to dete... We previously developed an HPLC method for determination of lanatoside C, digoxin and α-acetyldigoxin in digitalis glycosides isolated from Digitalis lanata leaves. Here, we present an improved HPLC-UV method to determine those compounds and deslanoside. We used the improved method to examine the effects of various pretreatments on the amounts of the four compounds isolated from the leaves, with the aim of maximizing the yield of digoxin. Leaves were extracted with 50% methanol, followed by clean-up on a Sep-Pak C18 cartridge prior to HPLC analysis. The amounts of lanatoside C, digoxin and α-acetyldigoxin per 100 mg of the leaves without pretreatment were 115.6, 7.45 and 23.8 μg, respectively (deslanoside was not detected). Pretreatment with acetic acid, which activated deglucosylation mediated by digilanidase present in the leaves, increased the amounts of digoxin and α-acetyldigoxin, while lanatoside C and deslanoside were not detected. Pretreatment with sodium methoxide, which hydrolyzed lanatoside C to deslanoside, increased the yields of deslanoside and digoxin, while lanatoside C and α-acetyldigoxin were not detected. The combination of both pretreatments afforded only digoxin in a yield of 115.1 μg/100 mg leaves. Use of the combined pretreatments appears to be effective for maximizing the yield of digoxin from the leaves. 展开更多
关键词 DIGOXIN Lanatoside C α-Acetyldigoxin Deslanoside HPLC digitalis lanata PRETREATMENT
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Optimizing Growth Conditions for Digoxin Production in Digitalis lanata Ehrh
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作者 Herman A.van Wietmarschen Hansj?rg Hagels +3 位作者 Ron Peters Jolanda Heistek Jan van der Greef Mei Wang 《World Journal of Traditional Chinese Medicine》 2016年第2期24-35,共12页
Objective: Digoxin is a therapeutic cardenolide widely used to treat various heart conditions such as atrial flutter, atrial fibrillation and heart failure in both Western as well as Chinese medicine. Digoxin is extra... Objective: Digoxin is a therapeutic cardenolide widely used to treat various heart conditions such as atrial flutter, atrial fibrillation and heart failure in both Western as well as Chinese medicine. Digoxin is extracted from cultivated Digitalis lanata Ehrh. plants, known as Mao Hua Yang Di Huang in Chinese medicine. This manuscript presents two studies that were conducted to optimize the cultivation conditions for digoxin production in the TCM Mao Hua Yan Di Huang in a greenhouse under GAP conditions.Methods: Two experiments were designed in which 4 growth conditions were compared. Levels of digoxin, gitoxin, digitoxin, α-acetyldigoxin, β-acetyl-digoxin were measured using HPLC-UV and compared between the conditions.Results: Normal soil, no CO_2 enrichment combined with a cold shock was found to be the optimal condition for producing digoxin in the first experiment. Gitoxin content was significantly lower in plants grown in this condition. Mechanical stress as well as the time of harvesting showed no statistically significant differences in the production of cardenolides. In the second experiment the optimal condition was found to be a combination of cold nights, sun screen, fertilizer use and no milled soil.Conclusion: This study shows that digoxin production can be increased by controlling the growth conditions of D. lanata Ehrh. The effect of cold was important in both experiments for improving digoxin production. Cultivating Chinese herbal medicines in optimized greenhouse conditions might be an economically attractive alternative to regular open air cultivation. 展开更多
关键词 digitalis lanata ehrh mao hua yang di huang CARDENOLIDES content optimisation TCM
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毛花洋地黄植物与培养细胞之间的羟化能力的关系 被引量:1
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作者 胡之璧 顾者珉 +1 位作者 黄炼栋 章国瑛 《Acta Botanica Sinica》 1988年第6期590-595,共6页
为了寻找具有高羟基化能力的细胞株系,首先研究了毛花洋地黄培养细胞的羟化能力与原植物的羟化能力和地戈辛含量之间的关系。分析了各种不同的细胞系对β-甲基洋地黄毒甙的生物转化活性。这些不同的细胞系是来源于各种具有不同地戈辛含... 为了寻找具有高羟基化能力的细胞株系,首先研究了毛花洋地黄培养细胞的羟化能力与原植物的羟化能力和地戈辛含量之间的关系。分析了各种不同的细胞系对β-甲基洋地黄毒甙的生物转化活性。这些不同的细胞系是来源于各种具有不同地戈辛含量和羟基化率的毛花洋地黄植物。实验结果表明,培养细胞的羟化能力与原植物的羟化能力之间不存在相应的依附关系。 展开更多
关键词 羟化能力 毛花洋地黄 羟基化 β-甲基洋地黄毒甙 β-甲基地戈辛 洋地黄强心甙 细胞培养 强心药物
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5种中药材中苯丙氨酸解氨酶(PAL)的生物信息学分析 被引量:3
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作者 耿雅萍 张鹏飞 +2 位作者 梁建萍 贾小云 刘亚令 《河南大学学报(自然科学版)》 CAS 2018年第6期669-682,共14页
中药材作为中药生产的原材料,其质量直接影响中药的品质.苯丙氨酸解氨酶(phenylalanine ammonialyase,PAL)对植物木质化、根瘤的形成、抗逆境、抗虫以及抗病等方面具有重要作用,特别是参与植物次生代谢,而中药材品质的高低主要体现在次... 中药材作为中药生产的原材料,其质量直接影响中药的品质.苯丙氨酸解氨酶(phenylalanine ammonialyase,PAL)对植物木质化、根瘤的形成、抗逆境、抗虫以及抗病等方面具有重要作用,特别是参与植物次生代谢,而中药材品质的高低主要体现在次生代谢产物含量的高低.因此,为了充分认识中药材中PAL的特点,本文选取了蒙古黄芪、刺槐、蓖麻、毛花洋地黄、胡黄连5种中药材作为研究对象,模式植物拟南芥为参考对象,运用在线工具及生物信息软件对这5种中药材及拟南芥的PAL基因编码序列进行分析,分析其核酸与蛋白的理化性质,结构特点以及之间的同源性.结果显示,5种中药材及拟南芥PAL基因序列长度在2 100~2 600bp之间,G+C含量为41%~49%,编码713~725个氨基酸.蛋白分子量最大的是拟南芥,为78.73kD;最小的是胡黄连,为77.67kD.PAL的酶切位点、糖基化位点、磷酸化位点在不同中药材中也各有异同;二级结构以螺旋和环为主,均由4个亚基组成了其三级结构.以上结果表明,5种中药材的PAL具有一定的同源性,其在进化过程中具有一定的保守性,核酸蛋白理化性质及二级结构有差异,但差异不大.在此基础上可进一步深入研究PAL在5种中药材苯丙烷代谢中对次生代谢物的调控机理,有目地地调节中药材中PAL的表达及活性,从而提高中药材品质. 展开更多
关键词 蒙古黄芪 刺槐 蓖麻 毛花洋地黄 胡黄连 苯丙氨酸解氨酶 生物信息学
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