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Recycling 2018, 3(2), 15; https://doi.org/10.3390/recycling3020015

A Green Extraction Process to Recover Polyphenols from Byproducts of Hemp Oil Processing

1
Faculty of Agriculture, Forestry & Natural Environment, Aristotle University of Thessaloniki, P.O. Box 235, 54124 Thessaloniki, Greece
2
Green Processes & Biorefinery Group, School of Agricultural Technology, Food Technology & Nutrition, University of Applied Sciences of Thessaly, Karditsa - 43100, Greece
*
Author to whom correspondence should be addressed.
Received: 28 March 2018 / Revised: 18 April 2018 / Accepted: 19 April 2018 / Published: 22 April 2018
(This article belongs to the Special Issue Food Waste – Strategies to Reuse and Prevention)
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Abstract

The valorization of solid waste hemp (Cannabis sativa L.) by a non-conventional method is presented in this article. Hemp polyphenols were extracted using aqueous solutions of 2-hydroxypropyl-β-cyclodextrin as an eco-friendly extraction solvent. Cyclodextrins (CD’s) are known to enhance the extraction of polyphenols in water by forming water soluble inclusion complexes. The process was optimized by implementing a response surface methodology (RSM) that took into consideration the following independent variables: CD concentration (CCD), solid-to-liquid ratio (S/L), and temperature (T). The assessment of the extraction model was based on two responses: the total polyphenol yield (YTP) and the antiradical activity (AAR). The optimum operating conditions were found to be: CD concentration, 32.1% (w/v); solid/solvent ratio, 1/15.2 g/mL; and extraction temperature, 28 °C. Different kinetic models were employed to fit with experimental data and the Peleg’s model was successfully developed for describing the mechanism of extraction under different processing parameters. View Full-Text
Keywords: antioxidants; hydroxypropyl-β-cyclodextrin; glycerol; Cannabis sativa; kinetic models antioxidants; hydroxypropyl-β-cyclodextrin; glycerol; Cannabis sativa; kinetic models
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Mourtzinos, I.; Menexis, N.; Iakovidis, D.; Makris, D.P.; Goula, A. A Green Extraction Process to Recover Polyphenols from Byproducts of Hemp Oil Processing. Recycling 2018, 3, 15.

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