Investigating microbial properties of traditional Iranian white cheese packed in active LDPE films incorporating metallic and organoclay nanoparticles

Document Type : Research Article

Authors

1 Department of Food Science and Technology, Faculty of Agriculture, University of Urmia, Urmia Iran

2 Faculty of Chemical & Petroleum Engineering, University of Tabriz, Tabriz, Iran

3 Department of Food Science, College of Agriculture, University of Tabriz, Tabriz, Iran

4 Professor of Food Technology, Department of Food Science, College of Agriculture, University of Tabriz, Tabriz, Iran

Abstract

Iranian white Cheese is a traditional type of cheese in Iran which is popular and widely consumed because of its pleasant organoleptic properties. To manufacture this cheese, raw milk is heated below pasteurization temperature, therefore, pathogenic and spoilage bacteria remain and cause several diseases in public health. In this research three kinds of nanocomposite films based on LDPE incorporated 1) Ag, CuO, ZnO, 2) Cloisite 15A, Cloisite 20A, Cloisite 30B that produced by extrusion method were used for packaging of the cheese and kept in 4°C during 28 days. Data analysis carried out using SPSS statistical software based on a completely randomized design. The results showed the nanocomposite films incorporated with metal nanoparticles had a significant decrease in the growth of Staphylococcus aureus, coliform, mold and yeast after 28 days, while, the growth of lactic acid bacteria decreased but less than control film. Sensory properties of cheese samples packed in active films were not significantly changed. However, physicochemical characteristics such as pH and moisture content were affected significantly by active films. Overall migration of packaging active films in food simulants were within amounts allowed by national and international legislations.

Keywords

References

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Chemical Review and Letters
Volume 3, Issue 4 - Serial Number 4
October 2020
Pages 168-174

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History

  • Receive Date: 16 May 2020
  • Revise Date: 05 July 2020
  • Accept Date: 18 July 2020

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