期刊
FOOD CHEMISTRY
卷 267, 期 -, 页码 28-35出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.03.106
关键词
By-product; Nutritional composition; Dietary fibre; Macrominerals; Vitamin E; Antioxidant and pro-oxidant activity; Hemolysis inhibition
资金
- project Operacao NORTE-FEDER-Qualidade e Seguranca Alimentar-uma abordagem (nano)tecnologica
- FCT/MEC [DID/QUI/50006/2013 - POCI/01/0145/FEDER/007265]
- FEDER
- [DID/QUI/500006/2013]
Coffee silverskin (a coffee roasting by-product) contains high amounts of dietary fibre (49% insoluble and 7% soluble) and protein (19%). Potassium (similar to 5 g/100 g), magnesium (2 g/100 g) and calcium (0.6 g/100 g) are the major macrominerals. The vitamin E profile of silverskin comprises alpha-tocopherol, beta-tocopherol, gamma-tocopherol, delta-tocopherol, beta-tocotrienol, gamma-tocotrienol, and delta-tocotrienol. The fatty acid profile is mainly saturated (C16:0 and C22:0), but the total amount of fat is low (2.4%). Caffeine (1.25 g/100 g), chlorogenic acid (246 mg/100 g), and 5-hydroxymethylfurfural (5.68 mg/100 g) are also present in silverskin. Total phenolics and flavonoids are partially responsible for the in vitro antioxidant activity. Silverskin extracts protected erythrocytes from oxidative AAPH-and H2O2-induced hemolysis, but at high concentrations a pro-oxidant effect on erythrocyte morphology was observed. (C) 2017 Elsevier Ltd. All rights reserved.
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