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首页> 外文期刊>Waste and biomass valorization >A Comparative Evaluation of Aqueous Natural Organic Acid Media for the Efficient Recovery of Flavonoids from Red Grape (Vitis vinifera) Pomace
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A Comparative Evaluation of Aqueous Natural Organic Acid Media for the Efficient Recovery of Flavonoids from Red Grape (Vitis vinifera) Pomace

机译：水性天然有机酸介质从红葡萄果渣中有效回收黄酮类化合物的比较评价

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摘要

Aqueous solutions of four natural organic acids, including lactic acid, acetic acid, citric acid and tartaric acid, were tested for their efficiency in recovering flavonoids from red grape pomace. The critical comparison was based on a Box-Behnken (central composite) factorial experimental design and response surface methodology, taking as independent variables the acid concentration (C_(acid)) and extraction time (t), and as responses the yield in total flavonoids (Y_(TFn)), total flavanols (Y_(TF)) and reducing power (P_R) of the extracts obtained. The results showed that the evolution pattern during extractions for all responses considered, differed as a function of the acid used, C_(acid) and t. Furthermore, significant differences were observed amongst the acids, concerning the extraction efficiency. The highest Y_(TFn) (2310.3 ± 198.5 μg rutin equivalents per g dry pomace weight) was achieved using 0.5 % lactic acid after 298 min of extraction, while maximum Y_(TF) (102.5 ± 9.7 μg catechin per g dry pomace weight) was attained by using 4 % acetic acid after 320 min of extraction. However, the greater P_R (80.2 ± 2.0 μM ascorbic acid equivalents) was expressed by the extract obtained with 0.8 % tartaric acid, following a 286 min extraction.
机译：测试了四种天然有机酸（包括乳酸，乙酸，柠檬酸和酒石酸）的水溶液从红葡萄果渣中回收黄酮类化合物的效率。关键比较是基于Box-Behnken（中央复合材料）析因实验设计和响应面方法，将酸浓度（C_（acid））和萃取时间（t）作为响应变量，并将总类黄酮的收率作为响应（Y_（TFn）），总黄烷醇（Y_（TF））和所得提取物的还原力（P_R）。结果表明，在提取过程中，考虑到的所有响应的演化方式均随所用酸，C_（酸）和t的变化而变化。此外，在酸之间观察到显着差异，涉及萃取效率。提取298分钟后，使用0.5％乳酸可获得最高的Y_（TFn）（每克干果渣重量2310.3±198.5μg芦丁当量），而最大的Y_（TF）（每克干果渣重量102.5±9.7μg儿茶素）萃取320分钟后，通过使用4％乙酸达到目标浓度。然而，在提取286分钟后，用0.8％酒石酸获得的提取物表现出更高的P_R（80.2±2.0μM抗坏血酸当量）。

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