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Release date:2016-09-02 10:06    Author:admin    Click: 
 
Abstract Thiourea chitosan was prepared by the reaction of chitosan with ammonium thiocyanate in ethanol. Thiourea chitosan was characterized by FT-IR, 13C NMR, and elemental analysis; XPS confirmed that in thiourea chitosan–AgC complex, S atoms coordinated to silver ions and were the major electron donors; O atoms also coordinated to silver ions and they were another electron donors next to S atoms. N atoms did not take part in coordination. Thiourea chitosan–AgC complex overcomes the instability of AgC. Antimicrobial activities of the complex was evaluated against six species of bacteria and molds. The complex showed a wide spectrum of antimicrobial activities, whose MIC values against bacteria were 20 times lower than those of chitosan, 100 times lower than those of sodium diacetate and 200 times lower than those of sodium benzoate, respectively; the complex has a better antibacterial activity than antifungal activity.
 
[3] Preparation of oligochitosan stabilized silver nanoparticles by gamma irradiation, Radiation Physics and Chemistry, 76 (2007) 1126–1131
 
Abstract Size tunable and biocompatible silver nanoparticles were prepared by g irradiation using oligochitosan as stabilizer, the average particle size was between 5 and 15 nm. Owing to the protonation of the shell, the silver nanoparticles were stable at pH between 1.8–9.0, as characterized by zeta potential measurements and transmission electron micrography (TEM). The nanoparticles are stable in NaCl solution; but NaNO3 or NaH2PO4 cause their aggregation.
 
[4] Effects of dietary supplementation of probiotics (Bacillus subtilis, Bacillus licheniformis,and Bacillus natto) on broiler muscle development and meat quality, Turkish Journal of Veterinary and Animal Sciences, vol 39 (2015), p. 203-210.    
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