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United States Department of Agriculture

Agricultural Research Service

Title: Novel Chemoenzymatic System for Effective Wool Bleaching, Biopolishing, and Shrinkage Control

Author
item Cardamone, Jeanette

Submitted to: Pacifichem Symposium
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2005
Publication Date: December 1, 2005
Citation: Cardamone, J.M. 2005. Novel chemoenzymatic system for effective wool bleaching, biopolishing, and shrinkage control. Program No. 432 [CD-ROM]. 2005 Abstract Viewer. Honolulu, Hawaii: International Chemical Congress of Pacific Basin Societies.

Technical Abstract: Stable, highly reactive, peroxide bleach was formed by combining hydrogen peroxide with dicyandiamide in the presence of gluconic acid. The reactive moiety, peroxycarboximidic acid was used at room temperature for 30 minutes to whiten wool to a higher level than conventional alkaline hydrogen peroxide applied for up to 60 minutes at 45° to 60°C. The active bleach was stable for several hours and consumed only 10% peroxide indicating the possibility of reconstituting the bath for further bleaching. LC/EI-MS, FTIR, and C13 NMR analyses were used to follow the reaction to completion with the formation of the end-product, guanylurea. Activated peroxide effectively prepared the wool for subsequent enzyme treatment with serine or thiol proteinase to biopolish the fabric for itch-free comfort; the peroxide imparted dimensional stability within 3% shrinkage or less after machine washing and drying without loss in fabric properties. The process provides a safe alternative to chlorination for shrinkage control and is effective on acetate, cotton, nylon, viscose and wool/cotton blended fabric. The isolated effects of components in the pretreatment bath were evaluated as were the effects of the full process on wool fiber, yarn, and fabric.

Last Modified: 12/20/2014
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