Colorimetric detection of milk spoilage at low temperatures: a novel PDA/ZnO@NC membrane for pH-based freshness monitoringColorimetric detection of milk spoilage at low temperatures: a novel PDA/ZnO@NC membrane for pH-based freshness monitoring
- Other Titles
- Colorimetric detection of milk spoilage at low temperatures: a novel PDA/ZnO@NC membrane for pH-based freshness monitoring
- Authors
- Li, Zhaowei; Jang, Huisoo; Park, Sungjin; Kim, Sun Min; Jeon, Tae-Joon
- Issue Date
- Feb-2024
- Publisher
- Korean Society for Biotechnology and Bioengineering
- Keywords
- Food waste; Freshness indicator; Polydiacetylene; Spoiled milk detection
- Citation
- Biotechnology and Bioprocess Engineering, v.29, no.1, pp 177 - 183
- Pages
- 7
- Journal Title
- Biotechnology and Bioprocess Engineering
- Volume
- 29
- Number
- 1
- Start Page
- 177
- End Page
- 183
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/32736
- DOI
- 10.1007/s12257-024-00021-9
- ISSN
- 1226-8372
1976-3816
- Abstract
- Food waste is a huge problem worldwide, and spoilage during storage is a major contributor. Food freshness monitoring systems can help reduce food waste by providing consumers with information to more accurately predict the shelf life of their food. In the case of milk, pH can be used as a freshness indicator. As milk spoils, microbial activity converts lactose to lactic acid, which produces hydrogen ions (H+) and consequently lowers the pH of the milk. In this paper, we propose a paper sensor that can detect the pH of milk in a refrigerated state (− 4 ℃) by color change. Polydiacetylene (PDA)/zinc oxide (ZnO) nanocomposite, which changes its color from blue to red as the pH decreases, was used as the color changing material. Specifically, the nanocomposite was applied to a nitrocellulose (NC) membrane, which is approved as a food packaging material for monitoring freshness during transport or on the shelf. The freshness monitoring function of the sensor was verified by applying artificially spoiled milk samples to the PDA/ZnO@NC membrane. In particular, it was demonstrated that the PDA/ZnO@NC membrane was shown to detect spoiled milk samples with pH 4.5 in 10 min at low temperature. Furthermore, the color change of the sensor upon detection of spoilage remained stable even after long-term storage. In conclusion, the PDA/ZnO@NC membrane presented in this study can be widely applied to the freshness monitoring of various food products stored at low temperatures whose spoilage is evaluated by pH. © The Author(s), under exclusive licence to The Korean Society for Biotechnology and Bioengineering and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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