Nutritional, chemical and antioxidant/pro-oxidant profiles of silverskin, a coffee roasting by-product

作者：Costa Anabela S G; Alves Rita C; Vinha Ana F; Costa Elisio; Costa Catarina S G; Antonia Nunes M; Almeida Agostinho A; Santos Silva Alice; Oliveira M Beatriz P P

来源：Food Chemistry, 2018, 267: 28-35.

DOI：10.1016/j.foodchem.2017.03.106

• By-product
• Nutritional composition
• Dietary fibre
• Macrominerals
• Vitamin E
• Antioxidant and pro-oxidant activity
• Hemolysis inhibition

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.

• 出版日期2018-11-30