TY  - CONF
AU  - Kuzmanović Nedeljković, Snežana
AU  - Ćujić Nikolić, Nada
AU  - Stević, Tatjana
AU  - Bigović, Dubravka
AU  - Šavikin, Katarina
AU  - Filipić, Brankica
PY  - 2024
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5689
AB  - Antimicrobial resistance (AMR) threatens to in- crease its mortality rate to 10 million deaths per year by 2050, and Acinetobacter bauman- nii stands out with its insensitivity to almost all available therapeutic options. The risk factors for the acquisition of A. baumannii infections have become more frequent during the coronavirus disease 2019 (COVID-19) pandemic, consequent- ly leading to increased AMR. Potential solutions may be explored among naturally derived prod- ucts, where essential oils (EOs) stand out with a broad spectrum of antimicrobial activity, com- plex chemical composition, and non-specific mechanisms of action postponing AMR devel- opment. However, their volatile nature may af- fect stability during shelf-life. Thus, we aimed to develop stable and effective microencapsulat- ed systems of essential oils (EOs) derived from two species from Lamiaceae family, Origanum heracleoticum L. (oregano) and Thymus vulgar- is L. (thyme). Microencapsulated complexes of oregano and thyme EOs (OEOC and TEOC) were prepared with hydroxypropyl-β-cyclodextrin as a carrier, and freeze-dried. Fourier-transform infrared spectroscopy verified the formation of inclusion complexes, while thermal stability was confirmed by differential scanning calorimetry. The microdilution broth assay revealed higher antimicrobial activity of the OEOC sample com- pared to TEOC against 64 A. baumannii isolates recovered from COVID-19 patients admitted to intensive care units (MIC values 0.4–1.6 mg/mL for OEOC, and ≥ 1.76 mg/mL for TEOC). Sub-in- hibitory concentrations of microencapsulated EOs significantly decreased the biofilm forma- tion of four A. baumannii isolates, representatives of a group of isolates based on the genetic pat- tern (Isolates 1, 2, 39, and 54). Concerning Isolate 2 (representing 60 of the total 64 isolates), the re- duction was achieved for more than 50% by both samples. Contrary to antimicrobial potential, TEOC displayed slightly better antioxidant activ- ity in the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. These results highlight the potential of mi- croencapsulated oregano and thyme EOs in the treatment of infections caused by A. baumannii.
PB  - Serbian Society for Microbiology
C3  - XIII Congress of microbiologists of Serbia with international participation, Mikromed regio 5: From biotechnology to human and planetary health, UMS series 24: 4th – 6th april 2024, Belgrade, Serbia, Book of Abstracts
T1  - Microencapsulated essential oils from two Lamiaceae species for combat against multi-resistant Acinetobacter baumannii
SP  - 179
EP  - 179
UR  - https://hdl.handle.net/21.15107/rcub_farfar_5689
ER  - 

@conference{
author = "Kuzmanović Nedeljković, Snežana and Ćujić Nikolić, Nada and Stević, Tatjana and Bigović, Dubravka and Šavikin, Katarina and Filipić, Brankica",
year = "2024",
abstract = "Antimicrobial resistance (AMR) threatens to in- crease its mortality rate to 10 million deaths per year by 2050, and Acinetobacter bauman- nii stands out with its insensitivity to almost all available therapeutic options. The risk factors for the acquisition of A. baumannii infections have become more frequent during the coronavirus disease 2019 (COVID-19) pandemic, consequent- ly leading to increased AMR. Potential solutions may be explored among naturally derived prod- ucts, where essential oils (EOs) stand out with a broad spectrum of antimicrobial activity, com- plex chemical composition, and non-specific mechanisms of action postponing AMR devel- opment. However, their volatile nature may af- fect stability during shelf-life. Thus, we aimed to develop stable and effective microencapsulat- ed systems of essential oils (EOs) derived from two species from Lamiaceae family, Origanum heracleoticum L. (oregano) and Thymus vulgar- is L. (thyme). Microencapsulated complexes of oregano and thyme EOs (OEOC and TEOC) were prepared with hydroxypropyl-β-cyclodextrin as a carrier, and freeze-dried. Fourier-transform infrared spectroscopy verified the formation of inclusion complexes, while thermal stability was confirmed by differential scanning calorimetry. The microdilution broth assay revealed higher antimicrobial activity of the OEOC sample com- pared to TEOC against 64 A. baumannii isolates recovered from COVID-19 patients admitted to intensive care units (MIC values 0.4–1.6 mg/mL for OEOC, and ≥ 1.76 mg/mL for TEOC). Sub-in- hibitory concentrations of microencapsulated EOs significantly decreased the biofilm forma- tion of four A. baumannii isolates, representatives of a group of isolates based on the genetic pat- tern (Isolates 1, 2, 39, and 54). Concerning Isolate 2 (representing 60 of the total 64 isolates), the re- duction was achieved for more than 50% by both samples. Contrary to antimicrobial potential, TEOC displayed slightly better antioxidant activ- ity in the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. These results highlight the potential of mi- croencapsulated oregano and thyme EOs in the treatment of infections caused by A. baumannii.",
publisher = "Serbian Society for Microbiology",
journal = "XIII Congress of microbiologists of Serbia with international participation, Mikromed regio 5: From biotechnology to human and planetary health, UMS series 24: 4th – 6th april 2024, Belgrade, Serbia, Book of Abstracts",
title = "Microencapsulated essential oils from two Lamiaceae species for combat against multi-resistant Acinetobacter baumannii",
pages = "179-179",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5689"
}

Kuzmanović Nedeljković, S., Ćujić Nikolić, N., Stević, T., Bigović, D., Šavikin, K.,& Filipić, B.. (2024). Microencapsulated essential oils from two Lamiaceae species for combat against multi-resistant Acinetobacter baumannii. in XIII Congress of microbiologists of Serbia with international participation, Mikromed regio 5: From biotechnology to human and planetary health, UMS series 24: 4th – 6th april 2024, Belgrade, Serbia, Book of Abstracts
Serbian Society for Microbiology., 179-179.
https://hdl.handle.net/21.15107/rcub_farfar_5689

Kuzmanović Nedeljković S, Ćujić Nikolić N, Stević T, Bigović D, Šavikin K, Filipić B. Microencapsulated essential oils from two Lamiaceae species for combat against multi-resistant Acinetobacter baumannii. in XIII Congress of microbiologists of Serbia with international participation, Mikromed regio 5: From biotechnology to human and planetary health, UMS series 24: 4th – 6th april 2024, Belgrade, Serbia, Book of Abstracts. 2024;:179-179.
https://hdl.handle.net/21.15107/rcub_farfar_5689 .

Kuzmanović Nedeljković, Snežana, Ćujić Nikolić, Nada, Stević, Tatjana, Bigović, Dubravka, Šavikin, Katarina, Filipić, Brankica, "Microencapsulated essential oils from two Lamiaceae species for combat against multi-resistant Acinetobacter baumannii" in XIII Congress of microbiologists of Serbia with international participation, Mikromed regio 5: From biotechnology to human and planetary health, UMS series 24: 4th – 6th april 2024, Belgrade, Serbia, Book of Abstracts (2024):179-179,
https://hdl.handle.net/21.15107/rcub_farfar_5689 .

TY  - JOUR
AU  - Kuzmanović Nedeljković, Snežana
AU  - Ćujić Nikolić, Nada
AU  - Radan, Milica
AU  - Milivojević, Dušan
AU  - Stević, Tatjana
AU  - Pljevljakušić, Dejan
AU  - Nikodinović-Runić, Jasmina
AU  - Bigović, Dubravka
AU  - Šavikin, Katarina
AU  - Filipić, Brankica
PY  - 2024
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5642
AB  - Within the global rise of antimicrobial resistance enhanced by the COVID-19 pandemic, where Acinetobacter baumannii has been distinguished as an emerging multi-resistant pathogen, essential oils, become the focus of novel therapeutic approaches. Hypothesizing that encapsulated Origanum heracleoticum L. and Thymus vulgaris L. essential oils could express multi-target approach against A. baumannii, this study aimed to develop microencapsulated systems with optimal technological qualities using 2-hydroxypropyl-β-cyclodextrin as a carrier, and to evaluate their pharmacological potential against A. baumannii, and their morphological and physicochemical characteristics, safety and stability profiles. The highest yield and encapsulation efficiency were obtained with 1:10 essential oil to carrier, and 1.5:10 carrier to water w/w ratios. The formation of inclusion complexes was confirmed by Fourier Transform Infrared Spectroscopy. Both microencapsulates achieved improved homogeneity, particle surface, and thermal stability compared with the pure carrier. Dominant bioactive compounds (carvacrol and p-cymene in O. heracleoticum essential oil, and thymol and p-cymene in T. vulgaris essential oil) remained the most abundant after encapsulation. While non-encapsulated essential oils revealed similar antimicrobial activity towards clinical A. baumannii isolates obtained from COVID-19 patients, encapsulated O. heracleoticum essential oil inhibited the bacterial growth at lower concentrations than T. vulgaris essential oil microencapsulate. All samples significantly reduced the formation of A. baumannii biofilm, for at least 53.90% towards the most infective isolate according to the Caenorhabditis elegans assay. Further, in silico molecular docking study revealed strong interaction pattern of carvacrol and thymol with the outer membrane protein A, which is the main factor for the A. baumannii biofilm formation. Cytotoxicity investigation on human lung A549 cells showed high survival rate in the presence of all tested concentrations, and the stability study revealed notable preservation of the bioactives’ content and pharmacological potential. Altogether, microencapsulated essential oils exhibited a multi-target approach towards A. baumannii, with satisfactory preserving capability during storage.
PB  - Elsevier B.V.
T2  - Industrial Crops and Products
T1  - Microencapsulation of Origanum heracleoticum L. and Thymus vulgaris L. essential oils – Novel strategy to combat multi-resistant Acinetobacter baumannii
VL  - 216
DO  - 10.1016/j.indcrop.2024.118762
ER  - 

@article{
author = "Kuzmanović Nedeljković, Snežana and Ćujić Nikolić, Nada and Radan, Milica and Milivojević, Dušan and Stević, Tatjana and Pljevljakušić, Dejan and Nikodinović-Runić, Jasmina and Bigović, Dubravka and Šavikin, Katarina and Filipić, Brankica",
year = "2024",
abstract = "Within the global rise of antimicrobial resistance enhanced by the COVID-19 pandemic, where Acinetobacter baumannii has been distinguished as an emerging multi-resistant pathogen, essential oils, become the focus of novel therapeutic approaches. Hypothesizing that encapsulated Origanum heracleoticum L. and Thymus vulgaris L. essential oils could express multi-target approach against A. baumannii, this study aimed to develop microencapsulated systems with optimal technological qualities using 2-hydroxypropyl-β-cyclodextrin as a carrier, and to evaluate their pharmacological potential against A. baumannii, and their morphological and physicochemical characteristics, safety and stability profiles. The highest yield and encapsulation efficiency were obtained with 1:10 essential oil to carrier, and 1.5:10 carrier to water w/w ratios. The formation of inclusion complexes was confirmed by Fourier Transform Infrared Spectroscopy. Both microencapsulates achieved improved homogeneity, particle surface, and thermal stability compared with the pure carrier. Dominant bioactive compounds (carvacrol and p-cymene in O. heracleoticum essential oil, and thymol and p-cymene in T. vulgaris essential oil) remained the most abundant after encapsulation. While non-encapsulated essential oils revealed similar antimicrobial activity towards clinical A. baumannii isolates obtained from COVID-19 patients, encapsulated O. heracleoticum essential oil inhibited the bacterial growth at lower concentrations than T. vulgaris essential oil microencapsulate. All samples significantly reduced the formation of A. baumannii biofilm, for at least 53.90% towards the most infective isolate according to the Caenorhabditis elegans assay. Further, in silico molecular docking study revealed strong interaction pattern of carvacrol and thymol with the outer membrane protein A, which is the main factor for the A. baumannii biofilm formation. Cytotoxicity investigation on human lung A549 cells showed high survival rate in the presence of all tested concentrations, and the stability study revealed notable preservation of the bioactives’ content and pharmacological potential. Altogether, microencapsulated essential oils exhibited a multi-target approach towards A. baumannii, with satisfactory preserving capability during storage.",
publisher = "Elsevier B.V.",
journal = "Industrial Crops and Products",
title = "Microencapsulation of Origanum heracleoticum L. and Thymus vulgaris L. essential oils – Novel strategy to combat multi-resistant Acinetobacter baumannii",
volume = "216",
doi = "10.1016/j.indcrop.2024.118762"
}

Kuzmanović Nedeljković, S., Ćujić Nikolić, N., Radan, M., Milivojević, D., Stević, T., Pljevljakušić, D., Nikodinović-Runić, J., Bigović, D., Šavikin, K.,& Filipić, B.. (2024). Microencapsulation of Origanum heracleoticum L. and Thymus vulgaris L. essential oils – Novel strategy to combat multi-resistant Acinetobacter baumannii. in Industrial Crops and Products
Elsevier B.V.., 216.
https://doi.org/10.1016/j.indcrop.2024.118762

Kuzmanović Nedeljković S, Ćujić Nikolić N, Radan M, Milivojević D, Stević T, Pljevljakušić D, Nikodinović-Runić J, Bigović D, Šavikin K, Filipić B. Microencapsulation of Origanum heracleoticum L. and Thymus vulgaris L. essential oils – Novel strategy to combat multi-resistant Acinetobacter baumannii. in Industrial Crops and Products. 2024;216.
doi:10.1016/j.indcrop.2024.118762 .

Kuzmanović Nedeljković, Snežana, Ćujić Nikolić, Nada, Radan, Milica, Milivojević, Dušan, Stević, Tatjana, Pljevljakušić, Dejan, Nikodinović-Runić, Jasmina, Bigović, Dubravka, Šavikin, Katarina, Filipić, Brankica, "Microencapsulation of Origanum heracleoticum L. and Thymus vulgaris L. essential oils – Novel strategy to combat multi-resistant Acinetobacter baumannii" in Industrial Crops and Products, 216 (2024),
https://doi.org/10.1016/j.indcrop.2024.118762 . .

TY  - JOUR
AU  - Novović, Katarina
AU  - Kuzmanović Nedeljković, Snežana
AU  - Poledica, Mirjana
AU  - Nikolić, Gordana
AU  - Grujić, Bojana
AU  - Jovčić, Branko
AU  - Kojić, Milan
AU  - Filipić, Brankica
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4471
AB  - Since the WHO declared the COVID-19 pandemic in March 2020, the disease has spread rapidly leading to overload of the health system and many of the patients infected with SARS-CoV-2 needed to be admitted to the intensive care unit (ICU). Around 10% of patients with the severe manifestation of COVID-19 need noninvasive or invasive mechanical ventilation, which represent a risk factor for Acinetobacter baumannii superinfection. The 64 A. baumannii isolates were recovered from COVID-19 patients admitted to ICU at General Hospital “Dr Laza K. Lazarević” Šabac, Serbia, during the period from December 2020 to February 2021. All patients required mechanical ventilation and mortality rate was 100%. The goal of this study was to evaluate antibiotic resistance profiles and virulence potential of A. baumannii isolates recovered from patients with severe form of COVID-19 who had a need for mechanical ventilation. All tested A. baumannii isolates (n = 64) were sensitive to colistin, while resistant to meropenem, imipenem, gentamicin, tobramycin, and levofloxacin according to the broth microdilution method and MDR phenotype was confirmed. In all tested isolates, representatives of international clone 2 (IC2) classified by multiplex PCR for clonal lineage identification, blaAmpC, blaOXA-51, and blaOXA-23 genes were present, as well as ISAba1 insertion sequence upstream of blaOXA-23. Clonal distribution of one dominant strain was found, but individual strains showed phenotypic differences in the level of antibiotic resistance, biofilm formation, and binding to mucin and motility. According to PFGE, four isolates were sequenced and antibiotic resistance genes as well as virulence factors genes were analyzed in these genomes. The results of this study represent the first report on virulence potential of MDR A. baumannii from hospital in Serbia.
PB  - Frontiers Media S.A.
T2  - Frontiers in Microbiology
T1  - Virulence potential of multidrug-resistant Acinetobacter baumannii isolates from COVID-19 patients on mechanical ventilation: The first report from Serbia
VL  - 14
DO  - 10.3389/fmicb.2023.1094184
ER  - 

@article{
author = "Novović, Katarina and Kuzmanović Nedeljković, Snežana and Poledica, Mirjana and Nikolić, Gordana and Grujić, Bojana and Jovčić, Branko and Kojić, Milan and Filipić, Brankica",
year = "2023",
abstract = "Since the WHO declared the COVID-19 pandemic in March 2020, the disease has spread rapidly leading to overload of the health system and many of the patients infected with SARS-CoV-2 needed to be admitted to the intensive care unit (ICU). Around 10% of patients with the severe manifestation of COVID-19 need noninvasive or invasive mechanical ventilation, which represent a risk factor for Acinetobacter baumannii superinfection. The 64 A. baumannii isolates were recovered from COVID-19 patients admitted to ICU at General Hospital “Dr Laza K. Lazarević” Šabac, Serbia, during the period from December 2020 to February 2021. All patients required mechanical ventilation and mortality rate was 100%. The goal of this study was to evaluate antibiotic resistance profiles and virulence potential of A. baumannii isolates recovered from patients with severe form of COVID-19 who had a need for mechanical ventilation. All tested A. baumannii isolates (n = 64) were sensitive to colistin, while resistant to meropenem, imipenem, gentamicin, tobramycin, and levofloxacin according to the broth microdilution method and MDR phenotype was confirmed. In all tested isolates, representatives of international clone 2 (IC2) classified by multiplex PCR for clonal lineage identification, blaAmpC, blaOXA-51, and blaOXA-23 genes were present, as well as ISAba1 insertion sequence upstream of blaOXA-23. Clonal distribution of one dominant strain was found, but individual strains showed phenotypic differences in the level of antibiotic resistance, biofilm formation, and binding to mucin and motility. According to PFGE, four isolates were sequenced and antibiotic resistance genes as well as virulence factors genes were analyzed in these genomes. The results of this study represent the first report on virulence potential of MDR A. baumannii from hospital in Serbia.",
publisher = "Frontiers Media S.A.",
journal = "Frontiers in Microbiology",
title = "Virulence potential of multidrug-resistant Acinetobacter baumannii isolates from COVID-19 patients on mechanical ventilation: The first report from Serbia",
volume = "14",
doi = "10.3389/fmicb.2023.1094184"
}

Novović, K., Kuzmanović Nedeljković, S., Poledica, M., Nikolić, G., Grujić, B., Jovčić, B., Kojić, M.,& Filipić, B.. (2023). Virulence potential of multidrug-resistant Acinetobacter baumannii isolates from COVID-19 patients on mechanical ventilation: The first report from Serbia. in Frontiers in Microbiology
Frontiers Media S.A.., 14.
https://doi.org/10.3389/fmicb.2023.1094184

Novović K, Kuzmanović Nedeljković S, Poledica M, Nikolić G, Grujić B, Jovčić B, Kojić M, Filipić B. Virulence potential of multidrug-resistant Acinetobacter baumannii isolates from COVID-19 patients on mechanical ventilation: The first report from Serbia. in Frontiers in Microbiology. 2023;14.
doi:10.3389/fmicb.2023.1094184 .

Novović, Katarina, Kuzmanović Nedeljković, Snežana, Poledica, Mirjana, Nikolić, Gordana, Grujić, Bojana, Jovčić, Branko, Kojić, Milan, Filipić, Brankica, "Virulence potential of multidrug-resistant Acinetobacter baumannii isolates from COVID-19 patients on mechanical ventilation: The first report from Serbia" in Frontiers in Microbiology, 14 (2023),
https://doi.org/10.3389/fmicb.2023.1094184 . .

TY  - CONF
AU  - Kuzmanović Nedeljković, Snežana
AU  - Ćujić Nikolić, Nada
AU  - Bigović, Dubravka
AU  - Petrović, Predrag
AU  - Pljevljakušić, Dejan
AU  - Šavikin, Katarina
AU  - Filipić, Brankica
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5120
AB  - Among plant natural products, Oregano and Thyme essential oils (EOs) are well-known for 
their antimicrobial and antioxidant activity. The biological activities of EOs may be reduced 
due to oxidation and volatilization. Stability and preservation of EOs can be assured with the 
microencapsulation method based on complex coacervation technology. Cyclodextrins are 
suitable as carriers for volatile substances insoluble in water, and hydroxypropyl-β cyclodextrin (HPCD) leads the group considering the aqueous solubility and safe toxicity 
profile. The aim of this study was to find conditions for preparing Oregano and Thyme EOs 
microencapsulates with the best technological properties.Oregano and Thyme EOs were 
encapsulated by the freeze drying (lyophilization) method. Nine different combinations were 
prepared, where HPCD content (10, 15 and 20%) and EO:HPCD mass ratio (1:1, 1:5 and 
1:10) were varied. After stirring (200 rpm) for 24 h at a room temperature, suspensions were 
filtered through 0.45 mm PTFE filters. Samples were evaporated under vacuum and frozen (-
80 °C for 1 h), then main drying was carried out (-60 °C, pressure of 0.011 mbar for 40 h), 
and final drying (-65 °C, pressure of 0.054 mbar for 1 h). To ensure the particle purity, 
lyophilizates were washed with acetonitrile and dried at 25 °C. The content of each EO was 
determined spectrophotometrically, encapsulation efficiency (EE%) and yield were 
calculated. Duncan’s post hoc test was used to evaluate the differences between samples. 
The best conditions for both EOs were obtained with 15% HPCD and EO:HPCD mass ratio 
of 1:10. Yields of EOs for chosen Oregano and Thyme EOs complexes were 86.81 ± 2.20% 
and 89.83 ± 2.80%, respectively, with the following EE% of 49.08 ± 1.80% and 49.29 ± 
0.18%. Microencapsulation is a promising method for improving the EOs stability profile, 
and these results could be very useful in the pharmaceutical and food industry for the 
implementation of new products.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Twentieth Young Researchers Conference – Materials Science and Engineering, November 30 - December 2, 2022, Belgrade, Serbia - Programme and the Book of Abstracts
T1  - Microencapsulation of Oregano and Thyme essential oils with hydroxypropyl-β cyclodextrin
SP  - 14
EP  - 14
UR  - https://hdl.handle.net/21.15107/rcub_farfar_5120
ER  - 

@conference{
author = "Kuzmanović Nedeljković, Snežana and Ćujić Nikolić, Nada and Bigović, Dubravka and Petrović, Predrag and Pljevljakušić, Dejan and Šavikin, Katarina and Filipić, Brankica",
year = "2022",
abstract = "Among plant natural products, Oregano and Thyme essential oils (EOs) are well-known for 
their antimicrobial and antioxidant activity. The biological activities of EOs may be reduced 
due to oxidation and volatilization. Stability and preservation of EOs can be assured with the 
microencapsulation method based on complex coacervation technology. Cyclodextrins are 
suitable as carriers for volatile substances insoluble in water, and hydroxypropyl-β cyclodextrin (HPCD) leads the group considering the aqueous solubility and safe toxicity 
profile. The aim of this study was to find conditions for preparing Oregano and Thyme EOs 
microencapsulates with the best technological properties.Oregano and Thyme EOs were 
encapsulated by the freeze drying (lyophilization) method. Nine different combinations were 
prepared, where HPCD content (10, 15 and 20%) and EO:HPCD mass ratio (1:1, 1:5 and 
1:10) were varied. After stirring (200 rpm) for 24 h at a room temperature, suspensions were 
filtered through 0.45 mm PTFE filters. Samples were evaporated under vacuum and frozen (-
80 °C for 1 h), then main drying was carried out (-60 °C, pressure of 0.011 mbar for 40 h), 
and final drying (-65 °C, pressure of 0.054 mbar for 1 h). To ensure the particle purity, 
lyophilizates were washed with acetonitrile and dried at 25 °C. The content of each EO was 
determined spectrophotometrically, encapsulation efficiency (EE%) and yield were 
calculated. Duncan’s post hoc test was used to evaluate the differences between samples. 
The best conditions for both EOs were obtained with 15% HPCD and EO:HPCD mass ratio 
of 1:10. Yields of EOs for chosen Oregano and Thyme EOs complexes were 86.81 ± 2.20% 
and 89.83 ± 2.80%, respectively, with the following EE% of 49.08 ± 1.80% and 49.29 ± 
0.18%. Microencapsulation is a promising method for improving the EOs stability profile, 
and these results could be very useful in the pharmaceutical and food industry for the 
implementation of new products.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Twentieth Young Researchers Conference – Materials Science and Engineering, November 30 - December 2, 2022, Belgrade, Serbia - Programme and the Book of Abstracts",
title = "Microencapsulation of Oregano and Thyme essential oils with hydroxypropyl-β cyclodextrin",
pages = "14-14",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5120"
}

Kuzmanović Nedeljković, S., Ćujić Nikolić, N., Bigović, D., Petrović, P., Pljevljakušić, D., Šavikin, K.,& Filipić, B.. (2022). Microencapsulation of Oregano and Thyme essential oils with hydroxypropyl-β cyclodextrin. in Twentieth Young Researchers Conference – Materials Science and Engineering, November 30 - December 2, 2022, Belgrade, Serbia - Programme and the Book of Abstracts
Belgrade : Institute of Technical Sciences of SASA., 14-14.
https://hdl.handle.net/21.15107/rcub_farfar_5120

Kuzmanović Nedeljković S, Ćujić Nikolić N, Bigović D, Petrović P, Pljevljakušić D, Šavikin K, Filipić B. Microencapsulation of Oregano and Thyme essential oils with hydroxypropyl-β cyclodextrin. in Twentieth Young Researchers Conference – Materials Science and Engineering, November 30 - December 2, 2022, Belgrade, Serbia - Programme and the Book of Abstracts. 2022;:14-14.
https://hdl.handle.net/21.15107/rcub_farfar_5120 .

Kuzmanović Nedeljković, Snežana, Ćujić Nikolić, Nada, Bigović, Dubravka, Petrović, Predrag, Pljevljakušić, Dejan, Šavikin, Katarina, Filipić, Brankica, "Microencapsulation of Oregano and Thyme essential oils with hydroxypropyl-β cyclodextrin" in Twentieth Young Researchers Conference – Materials Science and Engineering, November 30 - December 2, 2022, Belgrade, Serbia - Programme and the Book of Abstracts (2022):14-14,
https://hdl.handle.net/21.15107/rcub_farfar_5120 .

TY  - CONF
AU  - Kuzmanović Nedeljković, Snežana
AU  - Stević, Tatjana
AU  - Bigović, Dubravka
AU  - Šavikin, Katarina
AU  - Filipić, Brankica
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5119
AB  - BACKGROUND
COVID-19 pandemic brought a burden to the health care system including a higher rate of patients admitted to the intensive care unit (ICU). Mechanical ventilation, needed in COVID-19 patients admitted to ICU, increases the risk of developing multidrug-resistant (MDR) Acinetobacter baumannii superinfection, which may cause major problems in antibiotic treatment.
OBJECTIVES
The aim of this research was to examine the susceptibility of A. baumannii isolates recovered from COVID-19 patients 
to antibiotics usually used as treatment options, and to Oregano essential oil (EO) as naturally derived compound.
METHODS 
The 54 A. baumannii isolates were recovered from COVID-19 patients admitted to ICU, during period from December 
2020 to February 2021. Biofilm formation ability, as the factor that contributes to bacterial resistance, was examined. Minimum inhibitory concentrations (MICs) were determined for meropenem, imipenem, colistin, gentamicin, tobramycin and levofloxacin. In addition, all 54 isolates of A. baumanii were tested for susceptibility to Oregano EO.
RESULTS 
Results obtained in this study revealed a significant MDR profile of tested A. baumannii isolates. Even 74% (40/54) were strong biofilm producers. A. baumannii isolates were resistant to all tested antibiotics, except to colistin, leaving colistin as the only treatment option. On the other hand, MIC results obtained for Oregano EO were extremely promising: 0.279 mg/mL for all tested isolates. The obtained results emphasize a potentially new treatment approach to infections caused by MDR A. baumannii, using natural products such as EOs.
PB  - Federation of European Microbiological Societies
PB  - Serbian Society for Microbiology
C3  - FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book
T1  - Oregano essential oil sensitivity of multiresistant Acinetobacter baumannii strains isolated from COVID-19 patients
SP  - 272
EP  - 272
UR  - https://hdl.handle.net/21.15107/rcub_farfar_5119
ER  - 

@conference{
author = "Kuzmanović Nedeljković, Snežana and Stević, Tatjana and Bigović, Dubravka and Šavikin, Katarina and Filipić, Brankica",
year = "2022",
abstract = "BACKGROUND
COVID-19 pandemic brought a burden to the health care system including a higher rate of patients admitted to the intensive care unit (ICU). Mechanical ventilation, needed in COVID-19 patients admitted to ICU, increases the risk of developing multidrug-resistant (MDR) Acinetobacter baumannii superinfection, which may cause major problems in antibiotic treatment.
OBJECTIVES
The aim of this research was to examine the susceptibility of A. baumannii isolates recovered from COVID-19 patients 
to antibiotics usually used as treatment options, and to Oregano essential oil (EO) as naturally derived compound.
METHODS 
The 54 A. baumannii isolates were recovered from COVID-19 patients admitted to ICU, during period from December 
2020 to February 2021. Biofilm formation ability, as the factor that contributes to bacterial resistance, was examined. Minimum inhibitory concentrations (MICs) were determined for meropenem, imipenem, colistin, gentamicin, tobramycin and levofloxacin. In addition, all 54 isolates of A. baumanii were tested for susceptibility to Oregano EO.
RESULTS 
Results obtained in this study revealed a significant MDR profile of tested A. baumannii isolates. Even 74% (40/54) were strong biofilm producers. A. baumannii isolates were resistant to all tested antibiotics, except to colistin, leaving colistin as the only treatment option. On the other hand, MIC results obtained for Oregano EO were extremely promising: 0.279 mg/mL for all tested isolates. The obtained results emphasize a potentially new treatment approach to infections caused by MDR A. baumannii, using natural products such as EOs.",
publisher = "Federation of European Microbiological Societies, Serbian Society for Microbiology",
journal = "FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book",
title = "Oregano essential oil sensitivity of multiresistant Acinetobacter baumannii strains isolated from COVID-19 patients",
pages = "272-272",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5119"
}

Kuzmanović Nedeljković, S., Stević, T., Bigović, D., Šavikin, K.,& Filipić, B.. (2022). Oregano essential oil sensitivity of multiresistant Acinetobacter baumannii strains isolated from COVID-19 patients. in FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book
Federation of European Microbiological Societies., 272-272.
https://hdl.handle.net/21.15107/rcub_farfar_5119

Kuzmanović Nedeljković S, Stević T, Bigović D, Šavikin K, Filipić B. Oregano essential oil sensitivity of multiresistant Acinetobacter baumannii strains isolated from COVID-19 patients. in FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book. 2022;:272-272.
https://hdl.handle.net/21.15107/rcub_farfar_5119 .

Kuzmanović Nedeljković, Snežana, Stević, Tatjana, Bigović, Dubravka, Šavikin, Katarina, Filipić, Brankica, "Oregano essential oil sensitivity of multiresistant Acinetobacter baumannii strains isolated from COVID-19 patients" in FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book (2022):272-272,
https://hdl.handle.net/21.15107/rcub_farfar_5119 .

TY  - CONF
AU  - Filipić, Brankica
AU  - Novović, Katarina
AU  - Kuzmanović Nedeljković, Snežana
AU  - Jovčić, Branko
AU  - Kojić, Milan
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5118
AB  - BACKGROUND
From the start of COVID-19 pandemic, many patients suffering severe clinical presentation of COVID-19 and 
acute respiratory failure have been administered to intensive care units (ICUs). Need for noninvasive or invasive 
mechanical ventilation represents a high-risk factor for these patients to develop Acinetobacter baumannii 
superinfection.
OBJECTIVES
The main goal of this study was to examine virulence potential of A. baumannii isolates recovered from 
COVID-19 patients admitted to ICU as well as to compare differences in virulence among isolates originated 
from male and female patients or from different sample types.
METHODS
64 A. baumannii isolates were recovered from COVID-19 patients from December 2020 to February 2021. 
The isolates were originated from different sample types: blood, tip of the central venous catheter, tracheal 
aspirate, tip of the aspirator and sputum. Genetic relatedness of ApaI digested A. baumannii isolates, 
was determined by pulsed-field gel electrophoresis (PFGE). Affinity to mucin binding was tested using in vitro 
model and isolates were examined for two types of motilities: swarming and twitching.
PB  - Federation of European Microbiological Societies
PB  - Serbian Society for Microbiology
C3  - FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book
T1  - Assesing virulence potential of Acinetobacter baumannii isolates recovered from COVID-19 patients
SP  - 96
EP  - 96
UR  - https://hdl.handle.net/21.15107/rcub_farfar_5118
ER  - 

@conference{
author = "Filipić, Brankica and Novović, Katarina and Kuzmanović Nedeljković, Snežana and Jovčić, Branko and Kojić, Milan",
year = "2022",
abstract = "BACKGROUND
From the start of COVID-19 pandemic, many patients suffering severe clinical presentation of COVID-19 and 
acute respiratory failure have been administered to intensive care units (ICUs). Need for noninvasive or invasive 
mechanical ventilation represents a high-risk factor for these patients to develop Acinetobacter baumannii 
superinfection.
OBJECTIVES
The main goal of this study was to examine virulence potential of A. baumannii isolates recovered from 
COVID-19 patients admitted to ICU as well as to compare differences in virulence among isolates originated 
from male and female patients or from different sample types.
METHODS
64 A. baumannii isolates were recovered from COVID-19 patients from December 2020 to February 2021. 
The isolates were originated from different sample types: blood, tip of the central venous catheter, tracheal 
aspirate, tip of the aspirator and sputum. Genetic relatedness of ApaI digested A. baumannii isolates, 
was determined by pulsed-field gel electrophoresis (PFGE). Affinity to mucin binding was tested using in vitro 
model and isolates were examined for two types of motilities: swarming and twitching.",
publisher = "Federation of European Microbiological Societies, Serbian Society for Microbiology",
journal = "FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book",
title = "Assesing virulence potential of Acinetobacter baumannii isolates recovered from COVID-19 patients",
pages = "96-96",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5118"
}

Filipić, B., Novović, K., Kuzmanović Nedeljković, S., Jovčić, B.,& Kojić, M.. (2022). Assesing virulence potential of Acinetobacter baumannii isolates recovered from COVID-19 patients. in FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book
Federation of European Microbiological Societies., 96-96.
https://hdl.handle.net/21.15107/rcub_farfar_5118

Filipić B, Novović K, Kuzmanović Nedeljković S, Jovčić B, Kojić M. Assesing virulence potential of Acinetobacter baumannii isolates recovered from COVID-19 patients. in FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book. 2022;:96-96.
https://hdl.handle.net/21.15107/rcub_farfar_5118 .

Filipić, Brankica, Novović, Katarina, Kuzmanović Nedeljković, Snežana, Jovčić, Branko, Kojić, Milan, "Assesing virulence potential of Acinetobacter baumannii isolates recovered from COVID-19 patients" in FEMS Conference on Microbiology in association with Serbian Society of Microbiology, 30 June - 2 July 2022, Serbia - electronic abstract book (2022):96-96,
https://hdl.handle.net/21.15107/rcub_farfar_5118 .