20.500.12556/RUL-132846 Antimicrobial paper coatings containing microencapsulated Cymbopogon citratus oil Essential oils are environmentally friendly candidates for antimicrobial smart packaging systems. Encapsulation is needed to reduce their volatility and achieve controlled release. Within this study, the essential oil of Cymbopogon citratus (citronella oil) was microencapsulated and applied in pressure-sensitive antimicrobial functional coatings on papers for secondary packaging. Two microencapsulation methods were used: complex coacervation of gelatine with carboxymethylcellulose or with gum arabic, and in situ polymerization of melamine-formaldehyde prepolymers with a polyacrylic acid modifier. Minimum inhibitory concentrations of citronella oil microcapsules were determined for Bacillus subtilis (B. subtilis), Escherichia coli (B. subtilis), Pseudomonas aeruginosa (P. aeruginosa) and Saccharomyces cerevisiae (S. cerevisiae). Microcapsule suspensions were coated on papers for flexible packaging, 2 and 30 g/m$^2$, and mechanically activated in the weight pulling test. A novel method on agar plates in sealed Petri dishes was developed to evaluate the antimicrobial activity of released citronella vapours on E. coli and S. cerevisiae. The results showed that both microencapsulation methods were successful and resulted in a container type single-core microcapsules. In situ microcapsule suspensions had better paper coating properties and were selected for industrial settings. The antimicrobial activity of 2 g/m$^2$ coatings was not detected; however, the antimicrobial activity of 30 g/m$^2$ partially activated coated papers was confirmed. The product enabled a prolonged use with the gradual release of citronella oil at multiple exposures of functional papers to pressure, e.g., by a human hand during product handling. antimicrobial paper Cymbopogon citratus essential oil microcapsules coacervation in situ polymerization coating morphology antimicrobial tests true false true Angleški jezik Ni določen Članek v reviji 2021-11-05 08:16:27 2021-11-05 08:16:28 2022-09-12 04:14:01 0000-00-00 00:00:00 2019 0 0 21 str. iss. 8, art. 470 Vol. 9 2019 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 54 2079-6412 10.3390/coatings9080470 1498462 RAZ_Sumiga_Bostjan_2019.pdf RAZ_Sumiga_Bostjan_2019.pdf 1 27B56FA343573C693731332946150DE2 7048694667c480b0969a0e003618d1b6a7d8b4e710591fe57f89fd2e23478096 d7b58bd7-3e08-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=150576 https://www.mdpi.com/2079-6412/9/8/470 0 bbeb4c6a-3e08-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=150575 Naravoslovnotehniška fakulteta 0 0 0