Nutritional Changes in Commercial Oil Blend During Repetitive Deep Fat Frying of French Fries with Sensory Characteristic of Fried Food

Abstract

In present study, the effect of repetitive deep frying cycles (6 batches) of French fries was evaluated for nutritional changes of commercial oil blend (Canola, Sunflower, Cottonseed and Soybean) along with sensory characteristics of fried food. Each deep fat frying cycle was lasted for 13 min and resultant oil was analyzed for nutritional quality by assessing, free fatty acids (FFA), acid value (AV), para Anisidine value (p-AV), viscosity and fatty acid composition (FAC), while sensory characteristics of French fries were determined by evaluating appearance, color, crispness, taste and overall acceptability. Results showed that with increasing repetitive cycle’s leads to increase in FFA, AV, p-AV, and viscosity which is an indicator of frying oil deterioration. Up to 3 continuous cycles oil quality was within the permissible limits of INSO, however beyond that oil quality was not suitable. Result of FAC showed progressive increase in SFA (19.23 to 28.84%) from 1st to 6th frying cycle, while PUFA was significantly decreased during frying (39.31 to 31.75%). Sensory properties of French fries indicated particularly significant change (p>0.05) in color during last frying cycle as compared to other cycles (score 9.5 vs. 7.3).