TY - JOUR
T1 - Isolation of polyphenols from spent coffee grounds and silverskin by mild hydrothermal pretreatment
AU - Conde, Teresa
AU - Mussatto, Solange I.
PY - 2016
Y1 - 2016
N2 - In this study, a new method for isolation of polyphenols (PP) from spent coffee grounds (SCG) and coffee silverskin (CS) is described. The method consisted of a mild hydrothermal pretreatment at 120°C, for 20 min, using a liquid-to-solid ratio of 20 mL/g. PP (determined as gallic acid equivalents, GAE) were the most abundant components in the extracts produced by this method, corresponding to 32.92 mgGAE/gSCG and 19.17 mgGAE/gCS, among which flavonoids corresponded to 8.29 and 2.73 mg quercetin equivalents/g of SCG and CS, respectively. Both extracts presented antioxidant activity but the results were higher for SCG extract, probably due to the highest content of PP present. Negligible effects (less than 1% solubilization) were caused by the hydrothermal pretreatment on cellulose, hemicellulose, and protein fractions of these materials. Some mineral elements were present in the extracts, with potassium being the most abundant. Hydrothermal pretreatment under mild conditions was demonstrated to be an efficient method to recover antioxidant PP from coffee residues.
AB - In this study, a new method for isolation of polyphenols (PP) from spent coffee grounds (SCG) and coffee silverskin (CS) is described. The method consisted of a mild hydrothermal pretreatment at 120°C, for 20 min, using a liquid-to-solid ratio of 20 mL/g. PP (determined as gallic acid equivalents, GAE) were the most abundant components in the extracts produced by this method, corresponding to 32.92 mgGAE/gSCG and 19.17 mgGAE/gCS, among which flavonoids corresponded to 8.29 and 2.73 mg quercetin equivalents/g of SCG and CS, respectively. Both extracts presented antioxidant activity but the results were higher for SCG extract, probably due to the highest content of PP present. Negligible effects (less than 1% solubilization) were caused by the hydrothermal pretreatment on cellulose, hemicellulose, and protein fractions of these materials. Some mineral elements were present in the extracts, with potassium being the most abundant. Hydrothermal pretreatment under mild conditions was demonstrated to be an efficient method to recover antioxidant PP from coffee residues.
KW - Antioxidant activity
KW - coffee silverskin
KW - mild hydrothermal pretreatment
KW - polyphenols
KW - spent coffee grounds
UR - http://resolver.tudelft.nl/uuid:29978bdf-581d-4f3c-b88e-bd88ff19e0e8
U2 - 10.1080/10826068.2015.1084514
DO - 10.1080/10826068.2015.1084514
M3 - Article
AN - SCOPUS:84975804493
SN - 1082-6068
VL - 46
SP - 406
EP - 409
JO - Preparative Biochemistry and Biotechnology
JF - Preparative Biochemistry and Biotechnology
IS - 4
ER -