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Reconstructed membrane vesicles from the microalga Dunaliella as a potential drug delivery system. Bioelectrochemistry 2023; 150:108360. [PMID: 36621049 DOI: 10.1016/j.bioelechem.2022.108360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 12/03/2022] [Accepted: 12/24/2022] [Indexed: 12/28/2022]
Abstract
The aim of this biophysical study is to characterize reconstructed membrane vesicles obtained from microalgae in terms of their morphology, properties, composition, and ability to transport a model drug. The reconstructed vesicles were either emptied or non-emptied and exhibited a non-uniform distribution of spherical surface structures that could be associated with surface coat proteins, while in between there were pore-like structures of up to 10 nm that could contribute to permeability. The reconstructed vesicles were very soft and hydrophilic, which could be attributed to their composition. The vesicles were rich in proteins and were mostly derived from the cytoplasm and chloroplasts. We demonstrated that all lipid classes of D. tertiolecta are involved in the formation of the reconstructed membrane vesicles, where they play fundamental role to maintain the vesicle structure. The vesicles appeared to be permeable to calcein, impermeable to FITC-ovalbumin, and semipermeable to FITC-concanavalin A, which may be due to a specific surface interaction with glucose/mannose units that could serve as a basis for the development of drug carriers. Finally, the reconstructed membrane vesicles could pave a new way as sustainable and environmentally friendly marine bioinspired carriers and serve for studies on microtransport of materials and membrane-related processes contributing to advances in life sciences and biotechnology.
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Pulami D, Kämpfer P, Glaeser SP. High diversity of the emerging pathogen Acinetobacter baumannii and other Acinetobacter spp. in raw manure, biogas plants digestates, and rural and urban wastewater treatment plants with system specific antimicrobial resistance profiles. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 859:160182. [PMID: 36395844 DOI: 10.1016/j.scitotenv.2022.160182] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/09/2022] [Accepted: 11/10/2022] [Indexed: 06/16/2023]
Abstract
Carbapenem-resistant Acinetobacter baumannii causing immense treatment problems in hospitals. There is still a knowledge gap on the abundance and stability of acquired resistances and the diversity of resistant Acinetobacter in the environment. The aim of the study was to investigate the diversity and antimicrobial resistances of Acinetobacter spp. released from livestock and human wastewater into the environment. Raw and digested manure of small scale on farm biogas plants as well as untreated and treated wastewater and sewage sludge of rural and urban wastewater treatment plants (WWTPs) were studied comparatively. A total of 132 Acinetobacter isolates were phylogenetically identified (16S rRNA gene and rpoB sequence analyses) and 14 different phylotypes were detected. Fiftytwo isolates represented A. baumannii which were cultured from raw and digested manure of different biogas plants, and most stages of the rural WWTP (no hospital wastewater receiving) and the two studied urban WWTPs receiving veterinarian and human hospital wastewater. Multi-locus sequence typing (Pasteur_MLST) identified 23 novel and 12 known STs of A. baumannii. Most novel STs (18/23) were cultured from livestock samples and the rural WWTP. A. baumannii isolates from livestock and the rural WWTP were susceptible to carbapenems, colistin, ciprofloxacin, ceftazidime, and piperacillin. In contrast, A. baumannii isolates from the two urban WWTPs showed clinical linkage with respect to MLST and were multi-drug resistant (MDR). The presence of viable A. baumannii in digested manure and sewage sludge confirmed the survival of the strict aerobic bacteria during anoxic conditions. The study indicated the spread of diverse Acinetobacter from anthropogenic sources into the environment with a strong linkage of clinial associated MDR A. baumannii strains to the inflow of hospital wastewater to WWTPs. A more frequent detection of Acinetobacter in sewage sludge than effluent waters indicated that particle-attachment of Acinetobacter must be considered by the risk assessment of these bacteria.
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Affiliation(s)
- Dipen Pulami
- Institut for Applied Microbiology, Justus-Liebig-University Giessen, Germany
| | - Peter Kämpfer
- Institut for Applied Microbiology, Justus-Liebig-University Giessen, Germany
| | - Stefanie P Glaeser
- Institut for Applied Microbiology, Justus-Liebig-University Giessen, Germany.
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Novak J, Butorac K, Leboš Pavunc A, Banić M, Butorac A, Lepur A, Oršolić N, Tonković K, Bendelja K, Čuljak N, Lovrić M, Šušković J, Kos B. A Lactic Acid Bacteria Consortium Impacted the Content of Casein-Derived Biopeptides in Dried Fresh Cheese. Molecules 2021; 27:160. [PMID: 35011392 PMCID: PMC8746304 DOI: 10.3390/molecules27010160] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/22/2021] [Accepted: 12/23/2021] [Indexed: 11/17/2022] Open
Abstract
This study aimed to define a consortium of lactic acid bacteria (LAB) that will bring added value to dried fresh cheese through specific probiotic properties and the synthesis of bioactive peptides (biopeptides). The designed LAB consortium consisted of three Lactobacillus strains: S-layer carrying Levilactobacillus brevis D6, exopolysaccharides producing Limosilactobacillus fermentum D12 and plantaricin expressing Lactiplantibacillus plantarum D13, and one Enterococcus strain, Enterococcus faecium ZGZA7-10. Chosen autochthonous LAB strains exhibited efficient adherence to the Caco-2 cell line and impacted faecal microbiota biodiversity. The cheese produced by the LAB consortium showed better physicochemical, textural and sensory properties than the cheese produced by a commercial starter culture. Liquid chromatography coupled with matrix-assisted laser desorption/ionization-time of flight tandem mass spectrometry (LC-MALDI-TOF/TOF) showed the presence of 18 specific biopeptides in dried fresh cheeses. Their identification and relative quantification was confirmed by liquid chromatography-tandem mass spectrometry (LC-MS/MS) using multiple reaction monitoring (MRM). The results also showed that their synthesis resulted mainly from β-casein and also α-S1 casein degradation by proteolytic activities of the LAB consortium. The designed LAB consortium enhanced the functional value of the final product through impact on biopeptide concentrations and specific probiotic properties.
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Affiliation(s)
- Jasna Novak
- Laboratory for Antibiotic, Enzyme, Probiotic and Starter Cultures Technology, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia; (J.N.); (K.B.); (A.L.P.); (M.B.); (N.Č.); (J.Š.)
| | - Katarina Butorac
- Laboratory for Antibiotic, Enzyme, Probiotic and Starter Cultures Technology, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia; (J.N.); (K.B.); (A.L.P.); (M.B.); (N.Č.); (J.Š.)
| | - Andreja Leboš Pavunc
- Laboratory for Antibiotic, Enzyme, Probiotic and Starter Cultures Technology, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia; (J.N.); (K.B.); (A.L.P.); (M.B.); (N.Č.); (J.Š.)
| | - Martina Banić
- Laboratory for Antibiotic, Enzyme, Probiotic and Starter Cultures Technology, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia; (J.N.); (K.B.); (A.L.P.); (M.B.); (N.Č.); (J.Š.)
| | - Ana Butorac
- BICRO Biocentre Ltd., Borongajska cesta 83H, 10000 Zagreb, Croatia; (A.B.); (A.L.); (M.L.)
| | - Adriana Lepur
- BICRO Biocentre Ltd., Borongajska cesta 83H, 10000 Zagreb, Croatia; (A.B.); (A.L.); (M.L.)
| | - Nada Oršolić
- Department of Animal Physiology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia;
| | | | - Krešo Bendelja
- Centre for Research and Knowledge Transfer in Biotechnology, University of Zagreb, Rockefellerova 10, 10000 Zagreb, Croatia;
| | - Nina Čuljak
- Laboratory for Antibiotic, Enzyme, Probiotic and Starter Cultures Technology, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia; (J.N.); (K.B.); (A.L.P.); (M.B.); (N.Č.); (J.Š.)
| | - Marija Lovrić
- BICRO Biocentre Ltd., Borongajska cesta 83H, 10000 Zagreb, Croatia; (A.B.); (A.L.); (M.L.)
| | - Jagoda Šušković
- Laboratory for Antibiotic, Enzyme, Probiotic and Starter Cultures Technology, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia; (J.N.); (K.B.); (A.L.P.); (M.B.); (N.Č.); (J.Š.)
| | - Blaženka Kos
- Laboratory for Antibiotic, Enzyme, Probiotic and Starter Cultures Technology, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia; (J.N.); (K.B.); (A.L.P.); (M.B.); (N.Č.); (J.Š.)
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