Extraction of polyphenols and synthesis of new activated carbon from spent coffee grounds.

ABSTRACT: A valorization process of spent coffee grounds (SCG) was studied. Thus, a two-stage process, the first stage of polyphenols extraction and synthesis of a carbonaceous precursor and a subsequent stage of obtaining activated carbon (AC) by means of a carbonization process from the precursor of the previous stage, was performed. The extraction was carried out with a hydro-alcoholic solution in a pressure reactor, modifying time, temperature and different mixtures EtOH:H₂O. To optimize the polyphenols extraction, a two-level factorial experimental design with three replicates at the central point was used. The best results were obtained by using a temperature of 80 °C during 30 min with a mixture of EtOH:H₂O 50:50 (v/v). Caffeine and chlorogenic acid were the most abundan

SUBMITTER: Ramon-Goncalves M 

PROVIDER: S-EPMC6881328 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature