降解壳聚糖与水杨醛改性衍生物对Ca^(2+)、Fe^(3+)的螯合性质

Chelating Properties of Salicylaldehyde Modified Derivatives of Degraded Chitosan toward Ca^(2+) and Fe^(3+)

过氧化氢对壳聚糖氧化降解反应适宜条件为:温度70～80℃;pH=4～7;w(H2O2)=5%。对降解产物(CTS′)与水杨醛进行化学改性得相应衍生物S CTS′(H)、S CTS′(Na)和还原产物RS CTS′(H)、RS CTS′(Na)。在pH=10～11的水溶液中对Ca2+的螯合(吸附)能力为RS CTS′(Na)∽S CTS′(Na)>RS CTS′(H)∽S CTS′(H)。同时给出S CTS′(H)在c(HCl)=0 10mol/L的介质中对Fe3+螯合的UV吸收光谱。

Chitosan was degraded by oxidation with H2O2.The best quality degraded chitosan(CTS′) was obtained under the conditions of 70-80 ℃,w(H2O2)=5% and pH= 4-7.Through the reaction of degraded chitosan with salicylaldehyde,the modified derivatives SCTS′(H) and SCTS′(Na) and the corresponding reduction products RSCTS′(H) and RSCTS′(Na) were obtained. The chelating (adsorption) ability of the derivatives toward Ca2+ is in the order of RSCTS′(Na)∽SCTS′(Na)>RSCTS′(H) ∽SCTS′(H).The UVspectrum of chelating Fe3+ by SCTS′(H) in the solution of c(HCl)=010 mol/L was provided.