Abstract
The objective of this study was to evaluate, from a technological and nutritional point of view, the chemical composition and functional properties of the industrial winemaking by-products, namely skins, stems and lees. The chemical and physical characteristics, as well as the functional properties (fat and water retention and swelling capacity, antioxidant capacity, and their prebiotic effect), of the dietary fibre of these by-products were studied. The results showed that the skins, stems, and lees are rich in fibre, with the stem fibre containing the highest amounts of non-extractable polyphenols attached to polysaccharides with high antioxidant activity and prebiotic effect. Lee fibre had the highest water retention capacity and oil retention capacity. The results reveal that winemaking by-products could be used as a source of dietary fibre with functional characteristics for food applications.
Highlights
IntroductionThe generation of agricultural waste is of concern in viticulture; it is estimated that 25 kg of waste is produced for every 100 kg of grapes [2]
Waste from the agri-food industries is a current matter of global concern, with the generation of around 37 million tons of agricultural residues in the world during 2017 [1].The generation of agricultural waste is of concern in viticulture; it is estimated that 25 kg of waste is produced for every 100 kg of grapes [2]
This study presents a complete physical and chemical characterisation of three wineThisby-products: study presents a complete andby-products, chemical characterisation of three winemaking skins, stems andphysical lees
Summary
The generation of agricultural waste is of concern in viticulture; it is estimated that 25 kg of waste is produced for every 100 kg of grapes [2]. This involves an economic and ecological problem in the management of the winemaking industries [3,4]. The recovery process plays an important role in the circular economy approach. It improves biomass value where the biorefinery acts as a platform that includes several conversion technologies [5,6].
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