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The Real-time Assessment of Food Freshness in Refrigerator Based on Miniaturized Electronic Nose


Food freshness has been paid great attentions due to its direct relationship to human health and safety, and approaches for food freshness evaluation have attracted much interest from researchers. In this paper, we developed a miniaturized electronic nose system for convenient, direct and real-time food freshness evaluation by analyzing gases in the refrigerator (4℃). The proposed system consisted of a gas sampling module and MOS gas sensor array. The gas sampling module was used to extract gases from the refrigerator and clean the gas path by controlling a pump and a three-way valve. The gas sensor array was composed of three MOS sensors to monitor odor changes in the refrigerator. Meanwhile, food freshness assessment model was established based on the sensor array results and the comparison with human sensory evaluation results. In order to confirm the effectiveness of the system, we performed the experiments on meat, vegetables and fruits with three freshness levels including fresh, semi-fresh and spoilage. The accuracy of the system to identify three freshness levels is 84.8%, 68.0% and 96.2% respectively. The experimental results demonstrated that the developed electronic nose can effectively evaluate the food freshness level. Therefore, the proposed electronic nose provides a non-destructive, low cost and convenient platform for fast and real-time evaluation of food freshness in the refrigerator.

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Publication details

The article was received on 31 May 2018, accepted on 15 Jul 2018 and first published on 20 Jul 2018

Article type: Paper
DOI: 10.1039/C8AY01242C
Citation: Anal. Methods, 2018, Accepted Manuscript
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    The Real-time Assessment of Food Freshness in Refrigerator Based on Miniaturized Electronic Nose

    M. Wang, F. Gao, Q. Wu, J. Zhang, Y. Xue, H. Wan and P. Wang, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY01242C

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