Silk hydrogen peroxide

Nonabsorbable Natural Sutures. Cotton and silk are the only nonabsorbable sutures made from natural fibers that are stiH available ia the United States. Cotton suture is made from fibers harvested from various species of plants belonging to the genus Gossipium. The fiber is composed principally of ceUulose. The seeds are separated from the cotton boUs, which are carded, combed, and spun iato yams that are then braided or twisted to form sutures ia a range of sizes (Table 4). The suture is bleached with hydrogen peroxide and subsequendy coated (finished or glaced) with starch and wax. The suture may be white or dyed blue with D C Blue No. 9. 

Wool and Silk. Wool must be caretiiUy bleached to avoid fiber damage. It is usually bleached with 1—5% hydrogen peroxide solutions at pH 8—9 for several hours at 40—55°C or at pH 5.5—8 for 20—60 min at 70—80°C. Silk is bleached similarly, but at slightly higher temperatures. 

A 30 or 40 per cent by volume hydrogen peroxide is used as bleach for silk, wood, Wool, bones, teeths, feathers, mother of pearl, hom, hair, coral, gelatine, oils and fats. In medical science it is an excellent disinfectant and is also essential for sterilizing water for municipal use and preserving milk. Apart from this, hydrogen peroxide is used in the chemical industries for the manufacture of persalts and in laboratories for oxidation. 

The best method of bleaching silk is the use of hydrogen peroxide in a seperate... 

Recipe for Bleaching Silk with Hydrogen Peroxide... 

The fibre must be degummed before bleaching, and the addition of a small amount of hydrogen peroxide to the soap liquor assists in removal of the gum and brings about a slight preliminary improvement in colour. The silk is bleached in a 0-6 per cent w/w solution made as follows ... 

Qian J, Liu Y, Liu H et al. Characterization of regenerated silk fibroin membrane for immobilisation of peroxidase and construction of an amperometric hydrogen peroxide sensor employing phenazine methosulphate as electron shuttle. J Electroanal Chem 1995 397 157-162. 

SPF fibres are usually light yellow in colour. They are stable with both hydrogen peroxide and reduction bleaching. A whitening or brightening treatment may be necessary for purer whiteness (Fig. 13.7). When bleaching an SPF blended with another fibre, care must be taken to use a method suitable for both fibres. Either acid or reactive dyes may be used dye fastness compares well with that of silk. ... 

Hydrogen peroxide is a colorless, rather unstable liquid, usually sold as a 3% solution in water. It is a powerful oxidizing agent and oxidizes many organic molecules, especially pigments and dyes. Consequently, hydrogen peroxide is an excellent bleach for hair, food, flour, and silk and other textiles. 

Liu, Y., Liu, H., Qian, J., Deng, J., Yu, T. Regenerated silk fibroin membrane as immobilization matrix for peroxidase and fabrication of a sensor for hydrogen peroxide utilizing methylene blue as electron shuttle. Anal. Chim. Acta 316(1), 65-72 (1995)... 

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