Optimization of autohydrolysis conditions to extract antioxidant phenolic compounds from spent coffee grounds

Journal article (2017)

Authors

Lina F. Ballesteros University of Minho
Mónica J. Ramirez Universidad Nacional de Colombia
Carlos E. Orrego Universidad Nacional de Colombia
José Teixeira University of Minho
Solange Mussatto Technical University of Denmark
Research Group
BT/Bioprocess Engineering (AS) (TU Delft)
Phenolic compounds Antioxidant activity Autohydrolysis Extraction yield Spent coffee grounds
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Published Date

01-04-2017

Language

English

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Faculty

Applied Sciences

Department

BT/Biotechnologie

Research Group

BT/Bioprocess Engineering

Abstract

Autohydrolysis, which is an eco-friendly technology that employs only water as extraction solvent, was used to extract antioxidant phenolic compounds from spent coffee grounds (SCG). Experimental assays were carried out using different temperatures (160–200 °C), liquid/solid ratios (5–15 ml/g SCG) and extraction times (10–50 min) in order to determine the conditions that maximize the extraction results. The optimum conditions to produce extracts with high content of phenolic compounds (40.36 mg GAE/g SCG) and high antioxidant activity (FRAP = 69.50 mg Fe(II)/g SCG, DPPH = 28.15 mg TE/g SCG, ABTS = 31.46 mg TE/g SCG, and TAA = 66.21 mg α-TOC/g SCG) consisted in using 15 ml water/g SCG, at 200 °C during 50 min. Apart from being a green technology, autohydrolysis under optimized conditions was demonstrated to be an efficient method to extract antioxidant phenolic compounds from SCG.