Abstract: Carboxylate nanochitin (NC-) whiskers were prepared from shrimp chitin by TEMPO-NaBr-NaClO selective oxidation system. The optimal condition for production of small particles size with high carboxyl content of NC- were investigated by adjusting the pH value and dosage of NaClO (13% available chlorine) in the TEMPO-mediated oxidization system. The resulted NC- whiskers were qualified by Fourier transform infrared spectrometry; the morphology, effective size and size distribution, zeta potential, and carboxyl content of NC- whiskers were examined by transmission electron microscopy, dynamic light scattering method, and conductometry, respectively. The results showed that NC- whiskers synthesized in reaction system B1 (pH=10.5,V(NaClO)=15 mL in the system) had a highest carboxyl group of (3.16±0.23) mmol/g with hydrodynamic diameter (Z-average) of (113.97±2.29) nm and (-38.73±4.49) mV for zeta potential, while the carboxyl content, particle size and zeta potential of the resulted NC- whiskers synthesized in reaction system B0 (pH=10.5, V(NaClO)=18 mL) were (3.00±0.41) mmol/g, (106.13±0.38) nm and (-41.41±6.83) mV respectively. The particle size was significantly decreased with an increase of NaClO in the reaction system at pH 10.5 but there was no significant difference in carboxyl content and zeta potential. Therefore, the optimal condition to produce NC- whisker with a high biological activity is the treatment B0 due to small-size effect of nanomaterials, which was corresponding to the pH=10.5 and V(NaClO)=18 mL in the reaction system.
李雪云, 王合中. TEMPO氧化法制备纳米几丁质晶须粒子的优化及其产品特性表征[J]. 材料导报, 2018, 32(10): 1597-1601.
LI Xueyun, WANG Hezhong. Optimization and Characterization of TEMPO-Mediated Oxidization of Nanochitin Whiskers. Materials Reports, 2018, 32(10): 1597-1601.
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2018, Vol. 32 
