Use of walnuts (Juglans regia L.) waste from physical extraction of oil to produce flour and sweets

Abstract

The purpose of the research consists in enhancing the value of the secondary products of the seed oil industry, especially of the defatted walnut flour (Juglans regia L.). By adding it in the composition of sweets, the aim is to obtain a new product, with a balanced ensemble of nutritional substances – fats and carbohydrates. Also, it will be possible to enlarge the assortment of the confectionery products, which due to the low amount of carbohydrates, could be consumed by persons of all age, without the risk of sickening of diabetes.Physico-chemical methods were used to determine humidity, amount of fats, acid value, peroxide value and amount of total ash as well as the defatted walnut flour’s quality, used in the production of sweets. The product was subjected to physico – chemical, microbiological and sensory analysis. Due to the amount of fats contained in defatted walnut flour, the peroxide value in the finite product was determined. The aim is to notice wether fats’ oxidation occurs during storage which results in the worsening of organoleptic characteristics of the product – taste and flavor. The results show microbiological stability of the product, absence of oxidation of fats contained in defatted walnut flour, confirmed by sensory analysis. No taste or flavor drawbacks of the product that could be caused by fats’ oxidation were identified.