Laser photolysis of carboxymethylated chitin derivatives in aqueous   solution. Part 1. Formation of hydrated electron and a long-lived   radical

doi:10.1021/bm034272g

CORC > 北京大学 > 化学与分子工程学院

	Laser photolysis of carboxymethylated chitin derivatives in aqueous solution. Part 1. Formation of hydrated electron and a long-lived radical
	Zhai, ML ; Kudoh, H ; Wu, GZ ; Wach, RA ; Muroya, Y ; Katsumura, Y ; Nagasawa, N ; Zhao, L ; Yoshii, F
刊名	biomacromolecules
	2004
关键词	PULSE-RADIOLYSIS CHITOSAN IRRADIATION HYDROGELS
DOI	10.1021/bm034272g
英文摘要	Laser photolysis experiments on carboxymethylated chitin derivatives, such as carboxymethyl chitin (CM-chitin) and carboxymethyl chitosan (CM-chitosan), in aqueous solution by a 248 nm excimer laser were carried out for the first time. The transient absorption spectra of photolyzed CM-chitin or CM-chitosan solutions revealed a strong band with the maximum at 720 nm, which was assigned to the hydrated electron (e(aq)(-)). In the presence of argon, the e(aq)(-) decays by reacting with CM-chitin or CM-chitosan, and the rate constants are (6.1 +/- 0.1) x 10(7) M-1 s(-1) and (3.7 +/- 0.1) x 10(7) M-1 s(-1), respectively. Long-lived radicals with relatively weak absorption intensity were detected in the near-UV region. The absorption band was not notably characteristic and showed only an increasing absorption toward shorter wavelengths. It is similar to the signal of (CM)-C-.-chitin or (CM)-C-.-chitosan macroradicals formed by the reaction of CM-chitin or CM-chitosan with an OH. radical. It was assigned to (CM)-C-.-chitin(-) or (CM)-C-.-chitosan(-) macroradicals formed by e(aq)(-) + CM-chitin or CM-chitosan reaction. CM-chitin aqueous solutions were further examined by pulse radiolysis in order to confirm the site of the long-lived radical.; Biochemistry & Molecular Biology; Chemistry, Organic; Polymer Science; SCI(E); EI; 12; ARTICLE; 2; 453-457; 5
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/151616]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Zhai, ML,Kudoh, H,Wu, GZ,et al. Laser photolysis of carboxymethylated chitin derivatives in aqueous solution. Part 1. Formation of hydrated electron and a long-lived radical[J]. biomacromolecules,2004.
APA	Zhai, ML.,Kudoh, H.,Wu, GZ.,Wach, RA.,Muroya, Y.,...&Yoshii, F.(2004).Laser photolysis of carboxymethylated chitin derivatives in aqueous solution. Part 1. Formation of hydrated electron and a long-lived radical.biomacromolecules.
MLA	Zhai, ML,et al."Laser photolysis of carboxymethylated chitin derivatives in aqueous solution. Part 1. Formation of hydrated electron and a long-lived radical".biomacromolecules (2004).