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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
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INFLUENCE OF EXTRACTION CONDITIONS ON THE RECOVERY OF PHENOLIC ANTIOXIDANTS FROM SPENT COFFEE GROUNDS

机译：提取条件对从咖啡渣中回收酚醛抗氧化剂的影响

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摘要

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℃), 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℃, 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：研究了从世界范围内大量生产的废咖啡渣（SCG）中提取酚类化合物的方法。 SCG富含纤维和蛋白质，每克干重的总酚含量为18.75±0.43 mg GAE。以乙醇-水混合物为溶剂，以分批方式进行萃取实验。采用两级因子设计研究温度（T = 20-60℃），萃取时间（E = 30-80 min）和液固比（R = 10-50 mL g〜（ -1））回收酚类化合物。在最佳条件下（T = 60℃，E = 180 min，R = 50 mL g〜（-1）），回收的SCG中的酚含量超过90％。 T和R是影响最大的因素，并且都对提取效率产生积极影响。通过DPPH方法测定的提取物的抗氧化活性与每个样品中酚类的含量高度相关，这表明这些化合物是提取物抗氧化性能的主要起因。总体而言，这项研究的结果提供了SCG作为天然抗氧化剂来源的潜力的明确证据，并为如何通过适当选择提取条件提高其回收率提供了有用的指导。

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