Development of the pH Sensitive Indicator Label for Real-time Monitoring of Chicken Freshness

Document Type: Research Paper

Authors

1 Dept. of Food Hygiene and safety. Faculty of Health. Shahid sadoughi University of Medical sicences, Yazd, Iran.

2 Department of Food Hygiene and Safety, Faculty of Public Health, International Campus, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.

3 Zoonotic Diseases Research Center, Department of Food Hygiene and Safety, Faculty of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.

4 Department of Advanced Medical Sciences and Technologies, School of Paramedicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.

5 Medical biotechnology Research Center, Ashkezar Branch, Islamic Azad University, Ashkezar, Yazd, Iran.

Abstract

Intelligent packaging is a type of packaging which could control the environment around the food and inform consumers about food condition. The objective of present research was to design a simple pH-sensitive label in chicken package which show the spoilage by changing its color.
The Bromocresol green, a pH-sensitive color indicator, has been used to detect chicken spoilage and attached to the inner side of the package. The analysis including chemical (pH and TVBN), microbial and sensory analysis were done at the intervals of 0, 3, 5, 7, 8 and 10 days storage at 4 °C.
The TVB-N was 19 mg/100g in the first day and measured 29 mg/100 g on the 8th day and 46 mg/100g of on the last day, respectively. According to achieved results, the changes of BCG color due to chicken spoilage were detectable by naked eye. The bacterial count was about 6.62 Log10CFU/g. On the last day, the indicator’s color became blue and the total count reached about 7.20 Log10CFU/g. There was a significant relationship between Total Volatile Nitrogen Base (TVBN), pH, microbial and sensory analysis in all studied samples with the changes in indicator’s color during storage. Due to increase in TVBN during storage, the Bromocresol Green (BCG) indicator’s color changed from yellow to blue. Thus, the BCG indicator can be employed as an inexpensive and simple label to show the freshness of chicken meat.

Keywords


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