Chitosan capped gold nano particles for indicating temperature abuse in frozen stored products
Chitosan capped gold nano particles for indicating temperature abuse in frozen stored products
Date
2019
Authors
Mohan, C.O.
Gunasekaran, S.
Ravishankar, C.N.
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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 (λmax) 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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Citation
npj science of food 3(2):1-6