Synthesis and properties of photosensitive chitosan derivatives(1)

Synthesize and properties of photosensitive organic solvent soluble acylated chitosan derivatives (2)

“…The UV spectrum of the chitosan derivatives solution had an absorption band region range from 255 to 320 nm and an absorption peak at 280 nm, while the chitosan solution had no absorption peaks from 220 nm to 400 nm. It was consistent with previous results (Wang et al, 2009;Ma et al, 2010), where two peaks were ascribed to benzene residue group. However, in our work two overlapping peaks could be found with slightly shifted absorbance maxima, which could be due to the different degrees of substitution of chitosan.…”

“…The chitosan derivatives could be used as sunscreen because they had the UV-absorption groups (Juthathip, Mitsuru, Toshiyuki, & Suwabun, 2006;Renbutsu et al, 2008). Our research group previously reported the method of chitosan derivatives carrying the benzene group by Michael reaction (Ma, Qian, Yang, Hu, & Nie, 2010). Preparation of organic soluble chitosan derivatives can expand its application in many fields (Jeong et al, 2008;Ma et al, 2009;Wang et al, 2009;Zong et al, 2000).…”

Preparation, structure and crystallinity of chitosan nano-fibers by a solid–liquid phase separation technique

“…6a) ). According to the previous report, the reflection at 2Â = 11.4 • assigned to crystal form I and the stronger reflection appeared at 2Â = 22.0 • corresponded to crystal form II (Ma, Qian, Yang, Hu, & Nie, 2010). However, in the patterns of chitosan acetate matrices after solid-liquid phase separation in liquid nitrogen, the (1 0 0) reflection peak disappeared and the (0 2 0) reflection peak was slightly strengthen (Fig.…”

Preparation and characterization of water-soluble chitosan derivative by Michael addition reaction

“…where (C/N) m is the C/N of the chitosan derivative, (C/N) o is the C/N of the original chitosan, n is the number of carbon introduced after chitosan derivative and was reported by Ma et al [26]. The DS value obtained was 0.23 for chitosan derivative.…”