提取温度对亚麻籽胶流变性质的影响

EFFECT OF EXTRACTION TEMPERATURE ON THE RHEOLOGICAL PROPERTIES OF FLAXSEED GUM

测定了在不同温度下提取的亚麻籽胶的组成、色泽及黏度,通过对不同应用温度下的流变性质的研究,发现亚麻籽胶溶液黏度对温度依赖性很大,升温降温过程中胶黏度表现出明显的不对称性.此外,对亚麻籽胶的胶凝性质也进行了测定,发现亚麻籽胶是热可逆的冷致凝胶,其溶胶-凝胶转变具有温度上的滞后现象.

Flaxseed gum is a kind of natural polymer,which contains polysaccharide,protein and mineral elements. It has many functions, such as viscosity,water holding, emulsification and emulsification stability, foaming and foam stability. The properties of flaxseed gum are greatly affected by temperature. The present study was to investigate the effect of the extraction temperature on the composition, color and viscosity of flaxseed gum. Through the study of the rheological properties of at different temperatures, the gel properties of the flax seed were determined. The results showed that in a relatively short extraction time, the content of polysaccharide and protein in the gel increased with the temperature increasing;the content of polysaccharide was decreased in the long time extraction. The consistency coefficient and flow index of the flaxseed gum were different at the different extraction temperatures. The viscosity of flaxseed gum solution greatly depended upon temperature, and the viscosity of the gum was obviously asymmetry during cooling and heating. Furthermore, the gelling properties of flaxseed gum were also measured. The flaxseed gun solution could form a kind of heat reversible gel, and the change of sol-gel of flaxseed gum showed a hysteresis phenomenon on the temperature.