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Advantages of a two-step enzymatic process for cotton-polyester blends
Christian B Schimper1, Constanta Ibanescu, Rupert Keckeis
1Christian-Doppler-Laboratory, Textile and Fibre Chemistry of Cellulosics, Institute of Textile Chemistry and Textile Physics, Leopold-Franzens University Innsbruck, Dornbirn, Austria.
Abstract:
Cotton fabric samples were treated with a formulation of a total crude Trichoderma reesei cellulase in a two-step procedure. In the first step, samples were treated at a low liquor ratio by padding through the enzyme formulation at 21 degrees C and 55 degrees C with a wet pickup of 100% and batched for 12 h. The samples were then treated at a high liquor ratio (1:25) with an identical enzyme formulation at 55 degrees C, with intensive agitation. The pre-treatment influenced the overall weight loss and rate of hydrolysis in samples, and the protein concentration in the liquor of the second step. The overall weight loss was 25-28% (w/w) in the two-step procedure compared to a weight loss of 22% (w/w) in the one-step batch hydrolysis.
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