Production of chitosan from carapace of black tiger shrimp and its utilization for heavy metal adsorption
1997
Sumalai Srikumlaithong | Parichat Laixuthai | Rewadee Nakdee | Paros Vicharnrathakan | Narongdej Asa | Aiba, Sei-ichi | Shinagawa, Shun-ichi
Effective conditions for chitosan production was accomplished by deproteinizing with 1.0 N NaOH at the ratio of carapace to NaOH of 1:6 w/v at 95-100 degree celsius for 1 h and demineralizing with 1.25 N HCl at the ratio of solid of solid to HCl of 1:10 w/v at room temperature for 1 h. The resulting chitin was deacetylated with 50 percent w/v NaOH at th ratio of chitin to NaOH of 1:15 w/v at 120 degree celsius for 1 h. The chitosan with 28.6 percent yield was achieved with ash content of 0.16 percent, solubility of 100 percent, degree of deacetylaion of 82.04 percent, viscosity of 1372 cp, and nitrogen content of 7.9 percent. Its properties complied with the imported chitosan. The application of chitosan produced as toxic-metal binding agents in aqueous environment of electroplating plants was carried out. Its ability to adsorb Cu(++) , Ni(++) and Zn(++) was 70.00 percent, 10.12 percent and 20.49 percent respectively, which was similar to that of imported ones.
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