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首页> 外文期刊>The Journal of Supercritical Fluids >Extraction of indole alkaloids from Tabernaemontana catharinensis using supercritical CO_2+ethanol:an evaluation of the process variables and the raw material origin
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Extraction of indole alkaloids from Tabernaemontana catharinensis using supercritical CO_2+ethanol:an evaluation of the process variables and the raw material origin

机译：超临界CO_2 +乙醇提取中华绒螯蟹吲哚生物碱的工艺变量及原料来源评价

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摘要

Indole alkaloids from Tabernaemontana catharinensis,collected from different places,were extracted using a mixture of supercritical CO_2 plus ethanol.The effects of the process variables:temperature,pressure,solvent flow rate,and percentage of cosolvent on the total yield,chemical composition of the extract,and extraction kinetics were determined.The extracts were solvent-partitioned and their composition analyzed by TLC,GC-MS and ~1H and ~(13)C NMR.Voacangine and coronaridine were identified as the major compounds in the extracts;the individual alkaloids were quantified by GC-FID using external standard.At 250 bar and 45 deg C the largest yield (1.29%) and the faster extraction rate were obtained;increasing the percentage of cosolvent improved the extraction rate as well as the yield.Employing an intermittent process consisting in six pressurization-depressurization steps appreciably reduced the total extraction time.
机译：用超临界CO_2和乙醇的混合物从不同地方提取中华绒螯蟹的吲哚生物碱。工艺变量的影响：温度，压力，溶剂流速和助溶剂的百分比对总收率，化学组成的影响。对提取物进行溶剂分配，并通过TLC，GC-MS和〜1H和〜（13）C NMR分析其组成。使用外标通过GC-FID对生物碱进行定量，在250 bar和45摄氏度下获得最大的收率（1.29％）和更快的提取速率;增加助溶剂的比例提高了提取率和收率。由六个加压-减压步骤组成的间歇过程可显着减少总萃取时间。

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