Automatic identification of ramie and cotton fibers based on iodine blue reaction,Part I: the optimum conditions for the iodine blue reaction of cellulose

Abstract

A new iodine blue staining technique to distinguish ramie fibers from cotton fibers was presented. The influencing factors on staining color, including temperature, concentration of iodide anions in I₂-YI solution, ratio of the volumes of added I₂-YI solution and saturated LiX solution, time, and concentrations of alkali metal cation Y⁺ and halide anion X^–, were investigated to maximize the difference in color between stained cotton and ramie fibers. The optimum conditions were as follows: temperature: –15℃; concentration of iodide anion in colorant: 1/5; volume ratio: 1/20; colorant: I₂-LiI solution; swelling reagent: saturated LiCl solution. The experimental results showed that the new staining technique can be useful for automatic identification of cotton and ramie fibers.

Keywords

iodine blue reaction of cellulose staining techniques identification of cotton and ramie optimum conditions colorant swelling reagent

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