o Dietary fibre obtained from wastes of peach (Prunus persica L.) industrialization

LIA GERSCHENSON; MARINA DE ESCALADA PLA; JOHN NIETO CALVACHE

York

Congreso; 11th International Conference on Renewable Resources & Biorefineries; 2015

Ghent University, Development Agency of West Flanders, University of York

Soluble and insoluble portions of dietary fibre have differentphysiological functions. The insoluble part is related to water absorption andintestinal regulation while the soluble one can reduce blood cholesterol andglucose absorption.Wastes of the differentstages of fruit industrialization have a high content of organic material andcan be used to produce additives for the food, cosmetic and pharmaceuticalindustry.In this research, peach wastes remaining after juice extraction were usedas raw material for dietary fibre production. Peel and pulp were extracted after grinding with ethanol (95 % v/v), usinga ratio of 4 ml ethanol/1g sample (20°C,15 min). The solid residue was dehydrated using microwaves (500 W, 60°C). The product obtained wasmilled and sieved.Hydration properties and oiluptake were the functional properties evaluated. Density and particle sizedistribution were also measured. Structural characterization was performed throughscanning electron microscopy. A value of 35.7g water/g sample was observed for the water holdingcapacity (WHC) of the dietary fibre and this high value suggests that peachdietary fibre can be used as a functional ingredient to avoid syneresis, tomodify viscosity and texture of formulated food products, reducing caloriesthrough the partial or total substitution of ingredients of high caloriccontent.The oil holding capacity observed for the product enriched in peachdietary fibre was of 1.9 g/g value similar to others reported in literature forpeach and other plant tissues. The capacity for retaining oil can be importantin relation to fibre applications for avoiding lipid losses during cooking. Thecapacity of dietary fibre to get associated with bile acids increasing theirexcretion can also contribute to the reduction of plasmatic cholesterol.The good functionalproperties observed might be ascribed to higher specific volumes of the productand also to porous microstructure with tissue integrity regions. Theprocedure proposed for the obtention of products enriched in dietary fibre frompeach bagasse permitted the conservation of the tissue structure giving originto fractions with good functional properties that can be used for nutritionaland technological purposes.