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.

Analytical staining of cellulosic materials: A review

“…Though results from the many iodine-based staining assays (see Table B in the Appendix) provide evidence of the importance of redox reactions (see earlier discussion), it appears that their specificity also can be largely attributed to the differing nature of hemicelluloses present in different specimens. As already noted, the coloration of iodine complexes has been found to be strongly dependent on the chain length of the polysaccharides involved in the complexes (Swanson 1948;Jia et al 2016). It is notable that iodine-type assays have been used to distinguish between softwood and hardwood fibers Isenberg 1967).…”

“…Iodine has been a key component in several of the most widely used protocols aimed at distinguishing between different classes of woodpulps (Herzberg 1902;Isenberg 1967;AATCC 1990;Jia et al 2016). The popularity of iodine appears to be related to two complementary properties.…”

“…Choong et al 2016 Ramie and cotton fibers were differentiated using an iodine reaction. Jia et al 2016 Fluorescent proteins and histological stains can be used to stain diverse cell wall components. Ursache et al 2018 The preferential adsorption of various direct dyes onto cellulose can be rationalized, first of all, by the generally uncharged nature of the cellulose polymer.…”

Automatic identification of ramie and cotton fibers based on iodine blue reaction, Part II: Automatic identification of ramie and cotton using color, texture, shape, and stripes

“…The current system described in this paper uses this sample preparation method, in which the cotton and ramie fibers are cut into fiber segments and then stained with a stainer. 4 In this work, the sampled fiber 1 School of Art and Design, Guangdong University of Technology, China 2 Faculty of Computer, Guangdong University of Technology, China segments were shorter than those described by Wang et al [1][2][3] The self-developing stainer, which was dripped onto the fiber segments, could act as a dispersing agent itself. This made the sample preparation associated with this system simple and quick.…”

“…2 Previous studies used staining in a longitudinal view to identify cotton and ramie, which was theoretically not related to shape or stripes but dependent mainly on the supermolecular structures. 4 Hence, the identification based on shape, stripes, texture, and color of the stained fibers might necessarily increase recognition because of its comprehensive utilization of the aforementioned methods.…”