期刊
FOOD CHEMISTRY
卷 196, 期 -, 页码 917-924出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.10.026
关键词
Date; Antioxidant; Phenolic extract; Thermal treatment
资金
- Spanish Ministry of Economy and Competitiveness (Ramon y Cajal Programme) [RyC 2012-10456]
- Bang Islamique de Developpement BID (Saudi Arabia) [REF. 36/11201707]
Three common non-commercial Tunisian date varieties were treated by two thermal systems, obtaining a liquid fraction which was characterized and its antioxidant capacity determined. The concentration of total phenols in the three varieties (Smeti, Garen Gazel, and Eguwa) was increased by steam explosion treatment up to 5311, 4680, and 3832 mg/kg of fresh dates, and their antioxidant activity up to 62.5, 46.5 and 43.1 mmol Trolox (R)/kg of fresh date, respectively. Both thermal treatments increased the content of phenolic acids. Additionally, a long scale study was carried out in a pilot plant, with steam treatment at 140 degrees C and 160 degrees C for 30 min. The liquid phase was extracted and fractionated chromatographically using adsorbent or ionic resins. The phenolic profiles were determined for each fraction, yielding fractions with interesting antioxidant activities with EC50 values of up to 0.08 mg/L or values of TEAC of 0.67 mmol Trolox (R)/g of extract. (C) 2015 Elsevier Ltd. All rights reserved.
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