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Effects of Different Extraction Methods and Conditions on the Phenolic Composition of Mate Tea Extracts

机译:不同提取方法和条件对伴侣茶提取物中酚类成分的影响

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摘要

A simple and rapid HPLC method for determination of chlorogenic acid (5-O-caffeoylquinic acid) in mate tea extracts was developed and validated. The chromatography used isocratic elution with a mobile phase of aqueous 1.5% acetic acid-methanol (85:15, v/v). The flow rate was 0.8 mL/min and detection by UV at 325 nm. The method showed good selectivity, accuracy, repeatability and robustness, with detection limit of 0.26 mg/L and recovery of 97.76%. The developed method was applied for the determination of chlorogenic acid in mate tea extracts obtained by ethanol extraction and liquid carbon dioxide extraction with ethanol as co-solvent. Different ethanol concentrations were used (40, 50 and 60%, v/v) and liquid CO2 extraction was performed at different pressures (50 and 100 bar) and constant temperature (27 ± 1 °C). Significant influence of extraction methods, conditions and solvent polarity on chlorogenic acid content, antioxidant activity and total phenolic and flavonoid content of mate tea extracts was established. The most efficient extraction solvent was liquid CO2 with aqueous ethanol (40%) as co-solvent using an extraction pressure of 100 bar.
机译:建立并验证了一种简单快速的HPLC法测定伴侣茶提取物中的绿原酸(5-O-咖啡酰奎尼酸)的方法。色谱法使用等度洗脱,使用1.5%乙酸-甲醇水溶液(85:15,v / v)的流动相。流速为0.8mL / min,并通过325nm的UV检测。该方法具有良好的选择性,准确性,可重复性和鲁棒性,检出限为0.26 mg / L,回收率为97.76%。该方法用于乙醇提取,乙醇为辅助溶剂的液态二氧化碳提取所得到的伴侣茶提取物中的绿原酸的测定。使用了不同的乙醇浓度(40%,50%和60%,v / v),并在不同的压力(50和100 bar)和恒温(27±1°C)下进行了液态CO2萃取。确定了提取方法,条件和溶剂极性对伴侣茶提取物中绿原酸含量,抗氧化活性以及总酚和类黄酮含量的显着影响。最有效的萃取溶剂是液态二氧化碳,其中乙醇水溶液(40%)作为共溶剂,萃取压力为100 bar。

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