麻竹叶水溶性膳食纤维提取动力学及其理化特性研究

Extraction kinetics and physicochemical properties of soluble dietary fiber from Dendrocalamus latiflorus leaves

为了探究麻竹叶水溶性膳食纤维(Dendrocalamus latiflorus leaves soluble dietary fiber,DLSDF)提取过程动力学,并对麻竹叶资源的充分利用,以高浓度乙醇中试提取黄酮后的麻竹叶渣为原料,结合Fick第二定律,采用热水浸提法建立DLSDF的提取动力学模型,并对DLSDF的持水力、持油力、膨胀力、葡萄糖吸附值和阳离子交换力等理化特性进行测定。结果表明DLSDF的热水提取动力学模型计算值与实验测得数据拟合良好,活化能为6.99kJ/mol,相关系数R2均大于0.95;DLSDF的持水力、持油力、膨胀力、葡萄糖吸附值和阳离子交换分别为3.70g/g、4.06g/g、2.88mL/g、9.96mmol/g、0.64mmol/g。此提取过程的动力学符合一级动力学模型,且DLSDF的理化特性较好,为DLSDF的工程放大提供了理论依据。

The kinetics of the extraction process of soluble dietary fiber from Dendrocalamus latiflorus leaves(DLSDF)was studied to explore the full use of leaves. Leaves residues after extracting flavonoids with highconcentration ethanol were used as raw materials,the extraction kinetic model of DLSDF was established by Fick’s second law and hot water extraction method,and physicochemical properties of DLSDF,such as water holding capacity,oil holding capacity,swelling capacity,glucose adsorption value and cation exchange capacity were tested. The results showed that the calculated value of hot-water extraction kinetic model fitted well with the experimental data,active energy was 6.99k J/mol,and correlation coefficient R2 was greater than 0.95;the water holding capacity,oil holding capacity,swelling capacity,glucose adsorption value and cation exchange were 3.70g/g,4.06g/g,2.88m L/g,9.96mmol/g,0.64mmol/g,respectively. The kinetics of the extraction process conformed the first-order kinetic model,and physicochemical properties of DLSDF were good. The study provides a theoretical basis for the scale-up of DLSDF manufacturing.