title: High antioxidant activity of coffee silverskin extracts obtained by the treatment of coffee silverskin with subcritical water.
abstract: Coffee silverskin (CS) is a thin tegument of the outer layer of green coffee beans and a major by-product of the roasting process to produce roasted coffee beans. CS extracts obtained by the treatment of CS with subcritical water at 25-270°C were investigated for their antioxidant activity using hydrophilic oxygen radical absorption capacity (H-ORAC) and DPPH radical scavenging capacity assays. The antioxidant activity increased with increasing the extraction temperature and the highest activity was observed with the extracts obtained at 270°C. The H-ORAC and DPPH values of the extracts were 2629±193 and 379±36μmol TE/g of CS extract, respectively. High correlation (R=0.999) was observed between H-ORAC and DPPH values for the CS extracts. High correlation of the antioxidant activity was also observed with protein and phenolic contents in the extracts. The CS extracts could be useful as a good source of antioxidative materials.
authors.affiliation: Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Yusaku
authors.initials: Y
authors.lastname: Narita
authors.forename: Kuniyo
authors.initials: K
authors.lastname: Inouye
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D040503:Coffea / Q000737:chemistry*; D006358:Hot Temperature; D007220:Industrial Waste / Q000032:analysis*; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000975:Antioxidants; D007220:Industrial Waste; D010936:Plant Extracts