大豆油体乳液稳定性和流变性分析

    Analysis of stability and rheology of soybean oil body emulsions

    • 摘要: 研究大豆油体乳液的基本物理化学性质,将为其工业应用提供参考。以水为介质提取大豆油体,方法无毒,利于食用。对其在不同pH值(pH值2~8)、NaCl浓度(0~250?mmol/L)和加热处理(30~90℃,30?min)条件下的Zeta电位、平均粒径和乳析稳定性进行测定,并对其流变性进行考察。大豆油体乳液的Zeta电位为+20?mV~-40?mV(pH值2~8),等电点约为4.5。在pH值≤3和pH值≥6条件下,平均粒径均为0.4?μm左右;而在3<pH<6时,产生了乳析现象。在较高NaCl浓度下(>25?mmol/L),粒径较大和发生了乳析现象。大豆油体乳液在30~90℃加热处理时较稳定。大豆油体乳液呈现出弱凝胶的性质,其黏度随着油质量分数的降低而降低。研究表明,大豆油体乳液在一定的环境条件下是稳定的。

       

      Abstract: This study is focus on the physicochemical properties of soybean oil body emulsions for the industry application. Oil bodies were extracted from soybean using an aqueous extraction method and could be used in food process. The influences of pH (2-8), NaCl (0-250 mmol/L), and thermal processing (30-90℃, 30 min) on the properties and stability of the oil bodies were analyzed using Zeta-potential, mean particle diameters, and creaming stability measurements. Rheological properties of soybean oil body emulsions were determined. Zeta-potential of soybean oil body emulsions went from +20 mV to -40 mV as the pH was increased from 2 to 8, and the isoelectric point was around pH 4.5. Soybean oil body emulsions were stable on aggregation and creaming under low (pH ≤ 3) and high (pH ≥ 6) pH values, the particle diameters of which was about 400 nm; but they were unstable at intermediate pH values (3 

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