期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 66, 期 43, 页码 11372-11379出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.8b02899
关键词
amphoteric chitin nanocrystals; pH sensitivity; TEMPO oxidation; deacetylation
资金
- National Natural Science Foundation of China [31100426]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Different from single charged or uncharged nanocrystals, amphoteric chitin nanocrystals (A-ChNCs) with both amine and carboxylate groups prepared with 2,2,6,6-tetramethylpiperidine-1-oxy-radical (TEMPO)-mediated oxidation and partial deacetylation were individually nanodispersed by sonicating in water at pH 3 and pH 11. The effects of the amount of NaClO2 added in TEMPO-oxidation, deacetylation time, and sequence of the two treatments on the weight recovery ratios of the A-ChNCs were investigated. The A-ChNCs prepared under optimum conditions had an average length of similar to 544 nm and an average width of similar to 10 nm. The A-ChNCs nanodispersed in water at pH 3 and pH 11 had absolute zeta-potentials of >30 mV; however, in neutral water, they formed aggregations, which were nanodispersed again when pH was adjusted to 3 or 11, showing pH sensitivity. Hydrogels of A-ChNC were prepared by adding saturated NaCl solution and adsorbed both anionic and cationic dyes. Freeze-dried A-ChNC aerogels had three-dimensional network structures containing abundant pores.
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