Abstract
AbstractElectrospinning is a common technique used for the production of nanofibers, and it is based on the fact that the electrically charged liquid polymer is positioned in a continuous fiber form on a grounded surface. Grape seed is rich in phenolic compounds and can be used as a dietary supplement or as a natural antioxidant source in diet. In this study, grape seed extract of Burdur Dimrit variety (Vitis vinifera L.) was electrospun with gelatin, polyvinyl alcohol (PVA) and PVA/β-cyclodextrin polymers to produce nanofibers with antioxidant activity. The aim of this study was to determine the effect of the electrospinning process on the total antioxidant activity and total phenolic contents of electrospun polymers with grape seed extracts. Total antioxidant activity of samples (by ABTS and DPPH assays) and total phenolic contents (Folin–Ciocalteu method) were determined before and after the electrospinning process of polymers with grape seed extract. Electrospinning with gelatin polymer decreased the antioxidant activity (ABTS assay) of nanofibers containing grape seed extract by 65% and their total phenolic contents by 7%. However, electrospinning treatment with PVA and PVA/β-cyclodextrin had no effect on the total antioxidant activity (ABTS and DPPH) and total phenolic substance contents of grape seed extract nanofibers.
Highlights
Grape is one of the most common cultivated plants around the world because it is not very selective in terms of climate, soil, and its reproduction methods and can be consumed in many forms [1]
Pure solutions of polyvinyl alcohol (PVA) and gelatin showed an activity in the total phenolic content assay, and their total phenolic contents were determined as 36.05±0.23 and
The electrospinning process with gelatin polymer decreased the antioxidant activity of grape seed extract nanofibers with ABTS by 65% and total phenolic content by 7%
Summary
Grape is one of the most common cultivated plants around the world because it is not very selective in terms of climate, soil, and its reproduction methods and can be consumed in many forms [1]. Viticulture in Turkey, which is located at 36-42° northern latitude and has very convenient climate for grape quality, has a very important place in total agricultural crop production [2]. 80-90% of the grape weight constitutes the pulp part. The number of seeds in each grape ranges between 0-4 and 0-5% of the grape weight is composed of seeds. The composition of the grape seed includes catechin, epicatechin, gallocatechin, epigallocatechin, gallic acid, monomeric flavan-3-ol, procyanidin dimers, trimers and higher polymerized procyanidins [5]. In a study comparing the total phenolic content and antioxidant activities of the waste grape seeds obtained from the production of wine and molasses, it was reported that the grape seed obtained from the molasses production had a higher total phenolic content and antioxidant activity than that obtained from the wine production [7]. Linoleic acid (C18:2) content (67.63%) was the highest in the fatty acid composition of grape seed
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