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Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting
Published on: February 26, 2019
Chitosan-capped gold nanoparticles for indicating temperature abuse in frozen stored products
Chitradurga Obaiah Mohan1, S Gunasekaran2, C N Ravishankar3
11Fish Processing Division, ICAR-Central Institute of Fisheries Technology (Indian Council of Agricultural Research), Ministry of Agriculture & Farmers Welfare, Govt. of India, Matsyapuri P.O., Cochin, 682 029 India.
Abstract:
The present study aimed to optimize the conditions for the synthesis of gold nanoparticles (AuNP) using chitosan and to assess its effectiveness as temperature threshold indication for frozen storage conditions. Chitosan concentration of 0.25% and temperature of 90 °C for 15 min was optimum for synthesizing AuNP. The maximum absorbance (λ max) was observed at 530 and 540 nm for 0.125% and 0.25% chitosan, respectively, indicating shifting of peak toward longer wavelengths (red shift) with increasing chitosan concentration indicating larger AuNPs. A prominent absorption peak at 1367 cm-1 by Fourier transform-infrared (FTIR) spectrum corresponding to C-C stretching of the glucosamine group of chitosan indicates the chitosan capping on the AuNP. Higher peak intensity and a peak shift toward shorter wavelength were observed for AuNPs exposed to frozen temperature abused conditions. Distinctly clear visible color variation from cherry red to gray indicates its application as temperature abuse indicator in frozen products.
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