Effect of particle size and temperature on rheology and creep behavior of barley β-d-glucan concentrate dough

Abstract

Concentrated β-d-glucan has been added in the formulation of food products development that attributing human health. The purpose of this study is to assess the role of particle size (74, 105, 149, 297 and 595μm) of barley β-d-glucan concentrate (BGC) on two fundamental rheological properties namely oscillatory rheology and creep in a dough system (sample to water=1:2). The water holding capacity, sediment volume fraction and protein content increased with an increase in particle size from 74μm to 595μm, which directly influences the mechanical strength and visco-elasticity of the dough. The dough exhibited predominating solid-like behavior (elastic modulus, G′>viscous modulus, G″). The G′ decreased systematically with increasing temperature from 25 to 85°C at the frequency range of 0.1–10Hz except for the dough having particle size of 105μm, which could be associated with increase in protein content in the fraction. A discrete retardation spectrum is employed to the creep data to obtain retardation time and compliance parameters which varied significantly with particle size and the process temperature. All those information could be helpful to identify the particle size range of BGC that could be useful to produce a β-d-glucan enriched designed food.