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As we all know, chitosan which is one of the most abundant natural amino polysaccharide has many special properties, such
as biodegradability, nontoxicity, renewability and antibacteriality and so on. However, its low solubility in water restricts
the application in wood, food and other industries. To improve the water solubility of chitosan, the carboxymethyl group was
introduced. Acid red GR is commonly used in wood dyeing for its bright colors and easily penetrating in wood fiber. However,
the small dye molecules run off easily from wood which is love by bacterial. Hence, a newly synthesized biopolymer dye with
acid dye and anti-bacterial chitosan would have a huge market and broad prospects in wood industry for special situation
like hospital, etc. Therefore, a new and novel antimicrobial biopolymer dye was synthesized by reaction of o-carboxymethyl
chitosan and acid red GR. The synthesized products were characterized by Fourier transform infrared spectroscopy (FTIR),
X-ray diffraction (XRD), Thermogravimetric (TGA), solubility test and antimicrobial test. Results show that the antimicrobial
biopolymer dye was combined by NH3+ of chitosan and sulfonic group of acid red GR under acidic conditions. Water solubility
of chitosan biopolymer dye was increased. Moreover, the antibacterial property of the new synthesized dye was excellent,
whose antibacterial rates of S. aureus and E. coil were both bigger than 99%. These results may provide new perspectives on
improving the decorative properties and antimicrobial properties in wood industry.