One- and Two-Bath Pretreatments of Hemp Fabrics with α-Amylase and Pectinase
Vol. 51, No. 2, pp. 76-83,
Apr. 2014
10.12772/TSE.2014.51.076
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Abstract
To determine the optimum activation conditions for one- and two-bath pretreatments of hemp fabric with α-amylase and pectinase, the weight loss was measured after treatments at different pH, temperature, soak time, and pectinase concentration. In addition, the surfaces of the enzyme- and alkali-pretreated hemp fabrics were studied, and the pectin content, tensile strength, moisture absorption rate, and whiteness index were analyzed and compared. In the two-bath pretreatment, the optimum pectinase activation conditions after desizing using α-amylase were pH 9, 50 oC, 120 min soak time, and a pectinase concentration of 30%. In the one-bath pretreatment with a 1% α-amylase addition and a pectinase concentration of 30%, the optimum conditions were pH 8, 50 oC, and 80 min. The weight loss of the one-bath enzyme-pretreated hemp fabric was similar to that of the alkali-pretreated fabric, and smaller than that of the two-bath enzyme-pretreated fabric. The pectin content of the one-bath enzyme-pretreated hemp fabric was similar to that of the alkali-pretreated fabric, and larger than that of the two-bath enzyme-pretreated fabric. The surface of the alkali-pretreated hemp fabric was clean yet damaged, whereas the surfaces of the one- and two-bath pretreated hemp fabric were clean and smooth without damage. The tensile strength of the one-and two-bath enzyme pretreated hemp fabric was higher than that of the alkali-pretreated fabric. The absorption rate in the hemp fabric significantly increased following both the alkali-pretreatment and the one- and two-bath pretreatments.
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