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

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) a...

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Published in:Journal of food engineering 2017-04, Vol.199, p.1-8
Main Authors: Ballesteros, Lina F., Ramirez, Mónica J., Orrego, Carlos E., Teixeira, José A., Mussatto, Solange I.
Format: Article
Language:English
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Summary: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. •Autohydrolysis was a highly efficient method to extract phenolic compounds from SCG.•Liquid/solid ratio was the process variable with the largest influence on the results.•Phenolic compounds extracted from SCG presented high antioxidant activity.•Flavonoids and chlorogenic acid were identified in the SCG extract.
ISSN:0260-8774
1873-5770
0260-8774
DOI:10.1016/j.jfoodeng.2016.11.014