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| Transmission Characteristics of Biological Pollutant on Cold Surface through Surface Contact During Cold Storage |
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| Author Name | Affiliation | Postcode | | Zhiqiang Wang | 1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
2. International Centre in Fundamental and Engineering Thermophysics, Tianjin University of Commerce, Tianjin 300134, China
3. Key Lab of Agricultural Products Low Carbon Cold Chain of Ministry of Agriculture and Rural Affairs，Tianjin University of Commerce, Tianjin 300134, China
| 300134 | | Lixin Chen | 1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
2. International Centre in Fundamental and Engineering Thermophysics, Tianjin University of Commerce, Tianjin 300134, China
3. Key Lab of Agricultural Products Low Carbon Cold Chain of Ministry of Agriculture and Rural Affairs，Tianjin University of Commerce, Tianjin 300134, China
| 300134 | | Saiwei Ge | 1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
2. International Centre in Fundamental and Engineering Thermophysics, Tianjin University of Commerce, Tianjin 300134, China
3. Key Lab of Agricultural Products Low Carbon Cold Chain of Ministry of Agriculture and Rural Affairs，Tianjin University of Commerce, Tianjin 300134, China
| 300134 | | Wei Xiao | 1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
2. International Centre in Fundamental and Engineering Thermophysics, Tianjin University of Commerce, Tianjin 300134, China
3. Key Lab of Agricultural Products Low Carbon Cold Chain of Ministry of Agriculture and Rural Affairs，Tianjin University of Commerce, Tianjin 300134, China
| 300134 | | Zhuohao Xuan | 1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
2. International Centre in Fundamental and Engineering Thermophysics, Tianjin University of Commerce, Tianjin 300134, China
3. Key Lab of Agricultural Products Low Carbon Cold Chain of Ministry of Agriculture and Rural Affairs，Tianjin University of Commerce, Tianjin 300134, China
| 300134 | | Pengcheng Zhang* | 1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
4. School of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, China | 300134 |
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| Abstract: |
| The cold chain environment is an important route for the long-distance transmission of pathogenic microorganisms. In this study, we explored the mechanisms of secondary propagation through surface contact on cold surfaces. A quantitative statistical experimental method was adopted to study the surface-contact transmission of microorganisms, wherein the transfer rate of surface contact was the dependent variable and Escherichia coli was used as the indicator bacterium. The effects of contact pressure (0.44, 0.86, 1.55, 2.25, and 2.94 N/cm2), contact time (0, 15, 30, 45, and 60 s), contact angle (15° and 25°), and surface materials (rubber and cotton gloves) were measured at two storage temperatures: cold storage (5 ℃) and freezing (18 °C). The results showed that as the temperature decreases, the transfer of microorganisms through surface contact becomes less probable. The contact time did not significantly influence the transfer rate of microorganisms when items were handled at cold-storage temperatures. Based on these results, we recommend placing items as flat as possible to minimize the tilt angle when handling them at cold-storage temperatures. Additionally, if the tilt angle cannot be avoided, rubber gloves should be used when handling items stored at large tilt angles, whereas cotton gloves may be used for items placed at smaller angles. |
| Key words: cold chain biological pollutant surface contact transfer rate transmission characteristics |
| DOI：10.11916/j.issn.1005-9113.2025004 |
| Clc Number:Q93 |
| Fund: |
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| Descriptions in Chinese: |
| The cold chain environment is an important route for the long-distance transmission of pathogenic microorganisms. In this study, we explored the mechanisms of secondary propagation through surface contact on cold surfaces. A quantitative statistical experimental method was adopted to study the surface-contact transmission of microorganisms, wherein the transfer rate of surface contact was the dependent variable and Escherichia coli was used as the indicator bacterium. The effects of contact pressure (0.44, 0.86, 1.55, 2.25, and 2.94 N/cm2), contact time (0, 15, 30, 45, and 60 s), contact angle (15° and 25°), and surface materials (rubber and cotton gloves) were measured at two storage temperatures: cold storage (5 ℃) and freezing (18 °C). The results showed that as the temperature decreases, the transfer of microorganisms through surface contact becomes less probable. The contact time did not significantly influence the transfer rate of microorganisms when items were handled at cold-storage temperatures. Based on these results, we recommend placing items as flat as possible to minimize the tilt angle when handling them at cold-storage temperatures. Additionally, if the tilt angle cannot be avoided, rubber gloves should be used when handling items stored at large tilt angles, whereas cotton gloves may be used for items placed at smaller angles. |
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