Effect of Frying Treatments on Texture and Colour Parameters of Deep Fat Fried Yellow Fleshed Cassava Chips

A B Oyedeji,O P Sobukola,O A Ijabadeniyi,L O Sanni,M O Adegunwa,K I Tomlins,Folake Henshaw

doi:10.1155/2017/8373801

Abstract

Effects of frying treatments on texture (hardness) and colour parameters (L,a,b,ΔE) during deep fat frying of yellow fleshed cassava root slices (TMS 01/1371) were investigated. Slices (dimension of 40 mm × 25 mm × 3 mm) were divided into three portions and subjected to vacuum frying (fresh slices) and atmospheric frying (fresh and predried slices) and equivalent thermal driving forces (ETDF) of 60°C, 70°C, and 80°C were maintained during frying. The quality attributes investigated were best preserved in vacuum fried chips. The overall colour change in chips fried under vacuum conditions at 118°C and 8 min was the least (21.20) compared to fresh and atmospherically predried ones (16.69 and 14.81, resp.). A sharp reduction in the breaking force was obtained for all frying treatments after 8 min and this effect was the least in vacuum fried chips. First-order kinetics modeled the changes in quality attributes for all the temperatures investigated. Rate constants k (min−1) obtained for vacuum frying were almost equal to that of atmospheric frying while activation energies for hardness and colour change were 53.30 and 467.11 KJ/mol, respectively. Quality attributes studied were best preserved during vacuum frying.

Highlights

Frying as a complex unit operation is essentially a cooking process that has been widely used in the food industry
The resulting colour of foods processed in a high heat unit operation is a major quality attribute as it plays an important role in the perception of consumers about the foods at the point of purchase
The objective of this research is to study the effect of changes in frying treatments on the texture and colour parameters during deep fat frying of yellow fleshed cassava chips and to investigate changes in these quality attributes at each frying time for vacuum and atmospheric frying, determine kinetic parameters for these changes, and evaluate the activation energies for changes of these quality attributes with respect to each frying treatment

Summary

Introduction

Frying as a complex unit operation is essentially a cooking process that has been widely used in the food industry. The resulting colour of foods processed in a high heat unit operation is a major quality attribute as it plays an important role in the perception of consumers about the foods at the point of purchase. Parameters of colour such as lightness (L), redness (a), and yellowness (b) have been widely used in recent times to evaluate colour changes between the raw food materials and final products [4]

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