Journal
JOURNAL OF MICROENCAPSULATION
Volume 35, Issue 3, Pages 229-240Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02652048.2018.1462415
Keywords
Wine wastes; phenolic compounds; biological activities; HPLC and MS analysis; encapsulation; chitosan; alginate; microbeads
Funding
- IKY through the Siemens programme: 'IKY fellowships of excellence for postgraduate studies in Greece-Siemens program'
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Grapes (Vitis vinifera) are produced in large amounts worldwide and mostly are used for wine-making. Their untreated wastes are rich in valuable secondary metabolites, such as phenolics. Thus, in this study, white and red wine wastes (Malagouzia and Syrah variety) were investigated for their added value phenolics, which were analysed by high performance liquid chromatography (HPLC) and electrospray ionisation-mass spectrometry (ESI/MS) and subsequently encapsulated in several polymers. Extracts from all wastes gave high amounts of total phenolics (13 +/- 2.72-22 +/- 2.69 mg g(-1)) and possessed high antioxidant activity (67-97%). In addition to their significant antibacterial activity against gram-negative and gram-positive bacteria, interesting results were also obtained from their anti-inflammatory and antiplatelet activity, in vitro. Encapsulation of the extracts was selective, leaving out most of sugars and other organic compounds when alginate-chitosan was used. Encapsulation efficiency recorded for all extracts ranged from 55% to 79%. Release studies were also performed in several solutions aiming in their commercial use in food and pharmaceutical industries.
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