Extraction of Inulin from Cichorium intybus and its application as fat replacer in yoghurt

Abstract

Inulin is significant ingredient used in food industry that functions technologically as a fat replacer often without compromising taste and texture. In this study inulin was extracted from the chicory roots and the effect of inulin addition as a fat replacer on the physiochemical, microbiological and sensory properties of non-fat yoghurt was investigated. The supplementation of chicory inulin reduced the magnitude of firmness in comparison with non-inulin supplemented non-fat yoghurt. Higher values of acidity were observed due to the more microbial fermentation in the inulin containing yoghurt as compared to non-inulin yoghurt and were in the range of 0.56 to 0.75 during storage days. Syneresis in control sample increased from 43.9% to 47.9% during the storage study. However inulin addition at different treatment enhanced syneresis from 44.5% to 47.6%. Inulin addition at various concentrations caused an increase in the TPC due to its probiotic effect. No effects of inuline addition on fat and protein contents were observed. Non-fat yoghurt supplemented with inulin demonstrated sensory behavior better than that of the control yoghurt. The most important effect of the addition of inulin to non-fat yoghurt is an increase in the sensory attributes appearance, body and texture, taste and mouthfeel, overall acceptability. On an average, yoghurt supplemented with 1 to 2% inulin was better in overall acceptance as compared to control yoghurt

Keywords

• Inulin, fat replacer, yoghurt, sensory evaluation, low fat