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Development of a colorimetric sensor array for squid spoilage assessment.
Patricia Zaragozá1, Ana Fuentes2, María Ruiz-Rico2
1Centro de Reconocimiento Molecular y Desarrollo Tecnológico, Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, 46022 Valencia, Spain.
Food Chemistry
|January 12, 2015
Summary
A novel optoelectronic nose rapidly assesses squid shelf-life in cold storage. This colorimetric array accurately distinguishes fresh from spoiled squid, predicting spoilage indicators like microbial growth.
Area of Science:
- Food Science
- Analytical Chemistry
- Sensory Science
Background:
- Assessing seafood shelf-life is crucial for food safety.
- Traditional methods are time-consuming and labor-intensive.
- Rapid, non-destructive techniques are needed for real-time monitoring.
Purpose of the Study:
- To develop and evaluate a rapid optoelectronic system for squid shelf-life assessment.
- To create an easy-to-use colorimetric array for monitoring spoilage.
- To correlate sensor data with microbial and chemical changes.
Main Methods:
- Designed an optoelectronic nose with six sensing materials on inorganic supports.
- Packaged squid with the colorimetric array and stored under refrigeration for 12 days.
- Monitored spoilage using the array, alongside physico-chemical and microbial analyses.
- Applied Principal Component Analysis (PCA) and Partial Least Squares (PLS) regression.
Main Results:
- The colorimetric array successfully discriminated between fresh and spoiled squid.
- Microbial counts exceeded acceptable limits by day three.
- The optoelectronic nose accurately predicted headspace gas composition (CO2, O2) and microbial growth using PLS models.
Conclusions:
- The developed optoelectronic nose offers a rapid and effective method for squid shelf-life assessment.
- This technology can provide real-time insights into seafood quality during cold storage.
- The system has potential for application in the broader food industry for quality control.
