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首页> 外文期刊>American journal of applied sciences >INFLUENCE OF EXTRACTION CONDITIONS ON THE RECOVERY OF PHENOLIC ANTIOXIDANTS FROM SPENT COFFEE GROUNDS | Science Publications
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INFLUENCE OF EXTRACTION CONDITIONS ON THE RECOVERY OF PHENOLIC ANTIOXIDANTS FROM SPENT COFFEE GROUNDS | Science Publications

机译：提取条件对废咖啡渣酚类抗氧化剂恢复的影响科学出版物

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> The extraction of phenolic compounds from Spent Coffee Grounds (SCG), a waste produced in large amounts worldwide, was investigated. SCG were rich in fiber and protein and had a total phenolic content of 18.75±0.43 mg GAE per gram dry weight. Extraction experiments were carried out in batch mode, using ethanol?water mixtures as solvent. A two-level factorial design was used to study the effects of temperature (T = 20-60°C), extraction time (E = 30-80 min) and liquid-to-solid ratio (R = 10-50 mL g-1) on the recovery of phenolic compounds. Under the best conditions (T = 60°C, E = 180 min, R = 50 mL g-1), over 90% of the phenolics present in SCG were recovered. T and R were the most influential factors and both had a positive effect on the extraction efficiency. The antioxidant activity of the extracts, determined by the DPPH method, was highly correlated with the amount of phenolics in each sample, suggesting that these compounds are the main responsible for the antioxidant properties of the extracts. Overall, the results of this study provide clear evidence of the potential of SCG as a source of natural antioxidants and give useful directions on how to improve their recovery by proper selection of extraction conditions.
机译：研究了从咖啡渣（SCG）的酚类化合物的提取，在全球范围内大量生产的废物。 SCG富含纤维和蛋白质，总酚含量为18.75±0.43mg的每克干重。用乙醇批次进行提取实验，用乙醇进行水混合物作为溶剂。用于研究温度（T = 20-60°C），提取时间（E = 30-80分钟）和液到实心比（r = 10-50ml g <）的两个级别设计设计。 Sup> -1 ）酚类化合物的回收。在最佳条件下（T = 60℃，E = 180分钟，r = 50ml G -1 -1 / sop>），回收了90％的SCG中存在的酚菌。 T和R是最具影响力的因素，两者都对提取效率产生了积极影响。由DPPH方法确定的提取物的抗氧化活性与每个样品中的酚类量高度相关，表明这些化合物是萃取液的抗氧化性能的主要负责。 Overall, the results of this study provide clear evidence of the potential of SCG as a source of natural antioxidants and give useful directions on how to improve their recovery by proper selection of extraction conditions.

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