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

Costa, Anabela S.G.; Alves, Rita C.; Ferreira da Vinha, Ana; Costa, Elísio; Nunes, M. Antónia; Almeida, Agostinho A.; Santos-Silva, Alice; Oliveira, M. Beatriz .P.P.

http://hdl.handle.net/10284/9729

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Authors

Costa, Anabela S.G.

Alves, Rita C.

Ferreira da Vinha, Ana

Costa, Elísio

Nunes, M. Antónia

Almeida, Agostinho A.

Santos-Silva, Alice

Oliveira, M. Beatriz .P.P.

Abstract(s)

Coffee silverskin (a coffee roasting by-product) contains high amounts of dietary fibre (49% insoluble and 7% soluble) and protein (19%). Potassium (∼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 α-tocopherol, β-tocopherol, ɣ-tocopherol, δ-tocopherol, β-tocotrienol, ɣ-tocotrienol, and δ-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.

Keywords

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

URI

http://hdl.handle.net/10284/9729

Citation

Costa, A.S.G., Alves, R.C., Vinha, A.F., Costa, E., Costa, C.S.G., Nunes, M.A., Almeida, A.A., Santos-Silva, A., Oliveira, M.B.P.P. 2018. Nutritional, chemical and antioxidant/pro-oxidant profiles of silverskin, a coffee roasting by-product. Food Chemistry, 267, 28-35. (doi: 10.1016/j.foodchem.2017.03.106).