Участие в Международна конференция 2nd circular-a-ability conference от 11-13 септември и презентация от доц. Д.Тодорова на презентация „Lavender extract surface treatment of packaging paper for antimicrobial activity“ в Любляна, Словения

 

Lavender extract surface treatment of packaging paper for antimicrobial activity

Nikolay Yavorov, Dimitrina Todorova*, Veska Lasheva

Department of Pulp, Paper and Printing Arts, Faculty of Chemical Technologies, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski Blvd., 1756, Sofia, Bulgaria

 

Nowadays for the food industry, quality maintenance, food preservation and safety are major growing concerns. It is evident that over the time consumers’ demand for natural and safe food products with stringent regulations to prevent food-borne infectious diseases has been growing. Antimicrobial packaging is defined as a packaging material with biological properties that allows its interaction with the product or the headspace inside to reduce, inhibit, or retard the growth of spoilage or pathogenic microorganisms on food surfaces. Static extraction with 70% ethanol was performed at a raw material solvent ratio of 1:10, temperature 60 °C and duration 5 hours. Different cellulose packaging papers have been treated with lavender extract with relative density - d; refractive index - n and dry content, %. Results indicate the inhibition activity of the obtained paper samples on the growth of Gram-positive Bacteria Staphylococcus aureus ATCC 6538 in the range of 1.5-5.3%; at Gram-negative bacteria Escherichia coli ATCC 8739 in the range of 7.2-9.3 %; at yeast Candida albicans ATCC 10231the decrease in the number of viable cells is in the range of 3.1-9.4% and at fungi Aspergillus brasiliensis ATCC 16404 in the range of 1.6-6.1%, depending on the type paper used. The results show that the treatment of the investigated cellulose papers has an effect on the growth of the test microorganisms used and the papers treated with lavender extract poses antibacterial activity.

 

Key words: Antimicrobial, packaging, paper, lavender extract

 

Acknowledgments: The authors acknowledge the support of the National Science Fund and the University of Chemical Technology and Metallurgy, Sofia (project № КП-06-Н49/1).

 

Presentation of Todorowa (13.09.2023): download here