Halochromic optical nose for assessment of spoilage of packed seer fish (II): leaching resistance, correlation between halochromism and volatile amines
ISSN: 0369-9420
Article publication date: 18 May 2021
Issue publication date: 7 February 2022
Abstract
Purpose
Development of thin film sensors with pH function for noninvasive real-time monitoring of spoilage of packed seafood such as fish, crab and shrimp are described in this study. It is also the purpose of this study to enhance the leaching resistance of the sensors by using a suitable strategy and to quantitatively correlate the sensor’s halochromism with the total volatile amine.
Design/methodology/approach
To prepare halochromic sensors with better leaching resistance, biocompatible materials such as starch, agar, polyvinyl alcohol and cellulose acetate along with a halochromic dye were used to prepare the thin film sensors. These thin films were evaluated for monitoring the spoilage of packed seafood at room temperature, 4°C and −2°C up to 30 days. The halochromic sensors were characterized using UV-visible and FT-IR spectroscopy.
Findings
CIELab analyses of the halochromism of the thin film sensors revealed that the color changes exhibited by the sensors in response to the spoilage of seafood are visually distinguishable. Further, the halochromic response of the thin films was directly proportional to the amount of total volatile base nitrogen that evolved from the packed seafood. Excellent leaching resistance was observed for the developed thin film sensors. The halochromic property of the sensors is reversible and thus the sensors are recyclable. Besides, the thin film sensors exhibited significant biodegradability.
Originality/value
This study provides insights for use of different biocompatible polymers for obtaining enhanced leaching resistance in halochromic sensors. Further, the color changes exhibited by the sensors are in line with the total volatile amines evolved from the packed seafood. These results highlight the importance of the developed halochromic thin film sensors for real-time monitoring of the spoilage of packed seafood.
Keywords
Acknowledgements
The authors are thankful to the Tamil Nadu Dr J. Jayalalithaa Fisheries University, Nagapattinam, for financial support under Junior Teacher Research Fellowship (TNJFU/JTRF/CoFE/DK/2019). The authors are also thankful to Sophisticated Analytical Instrument Facility, IIT Madras and Archbishop Casimir Instrumentation Center, St. Joseph’s College, Trichy, for providing analytical services.
Citation
Devarayan, K., P., P. and Sivakami Nagaraju, K. (2022), "Halochromic optical nose for assessment of spoilage of packed seer fish (II): leaching resistance, correlation between halochromism and volatile amines", Pigment & Resin Technology, Vol. 51 No. 2, pp. 162-170. https://doi.org/10.1108/PRT-11-2020-0115
Publisher
:Emerald Publishing Limited
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