RESEARCH ARTICLE


Useful Bioactive Substances from Wastes: Recovery of Trans-Resveratrol from Grapevine Stems



George Angelov*, Lubomir Boyadzhiev, Silviya Georgieva
Institute of Chemical Engineering, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria


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© Angelov et al. Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Institute of Chemical Engineering, Bulgarian Academy of Sciences, Acad. Bonchev St., Block 103, 1113 Sofia, Bulgaria; Tel: +35929793286; E-mail: gang@bas.bg


Abstract

The methods for producing natural resveratrol are of big interest because of the many health benefits of this substance and its increasing use in functional foods, food supplements and para-pharmaceutical preparations. Generally, resveratrol is extracted from different natural sources, most of them usually produced for consumption purposes (grapes, nuts). This paper presents a method for recovery of resveratrol from a widely available raw material - grapevine stems, a by-product of vine pruning. An efficient extraction-fractionation scheme is developed, based on shifting the phase equilibrium, by which more concentrated extracts of resveratrol are obtained. After a simple extraction, the initial extract is further separated into two fractions, containing either water or ethanol-soluble compounds. Using this approach, the resveratrol’s low water solubility helps isolate it from other water-soluble substances. The resulting product is almost ten times more concentrated in trans-resveratrol than the initial total extract. Additionally, a fraction containing water-soluble polyphenols is obtained, which could be used for water-based pharmaceutical and cosmetic preparations.

Keywords: Extraction, grapevine stems, polyphenols, resveratrol.