. Encapsulation of antioxidant phenolic compounds extracted from spent coffee grounds by freeze-drying and spray-drying using different coating materials. Food Chemistry, 237, 623-631. https://doi.org/10.1016Chemistry, 237, 623-631. https://doi.org/10. /j.foodchem.2017 Accepted Manuscript Encapsulation of antioxidant phenolic compounds extracted from spent coffee grounds by freeze-drying and spray-drying using different coating materials This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. achieved when PC were encapsulated by freeze-drying using maltodextrin as wall material. 35Under these conditions, the amount of PC and FLA retained in the encapsulated sample 36 corresponded to 62% and 73%, respectively, and 73-86% of the antioxidant activity present in 37 the original extract was preserved.

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a b s t r a c tAutohydrolysis, 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 (160e200 C), liquid/solid ratios (5e15 ml/g SCG) and extraction times (10e50 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 ¼ 69.50 mg Fe(II)/g SCG, DPPH ¼ 28.15 mg TE/g SCG, ABTS ¼ 31.46 mg TE/g SCG, and TAA ¼ 66.21 mg a-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.

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