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Bajetto G, Scutera S, Menotti F, Banche G, Chiaradia G, Turesso C, De Andrea M, Vallino M, Es DSV, Biolatti M, Dell’Oste V, Musso T. Antimicrobial Efficacy of a Vegetable Oil Plasticizer in PVC Matrices. Polymers (Basel) 2024; 16:1046. [PMID: 38674966 PMCID: PMC11054656 DOI: 10.3390/polym16081046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/03/2024] [Accepted: 04/08/2024] [Indexed: 04/28/2024] Open
Abstract
The growing prevalence of bacterial and viral infections, highlighted by the recent COVID-19 pandemic, urgently calls for new antimicrobial strategies. To this end, we have synthesized and characterized a novel fatty acid epoxy-ester plasticizer for polymers, named GDE. GDE is not only sustainable and user-friendly but also demonstrates superior plasticizing properties, while its epoxy components improve the heat stability of PVC-based matrices. A key feature of GDE is its ability to confer antimicrobial properties to surfaces. Indeed, upon contact, this material can effectively kill enveloped viruses, such as herpes simplex virus type 1 (HSV-1) and the β-coronavirus prototype HCoV-OC43, but it is ineffective against nonenveloped viruses like human adenovirus (HAdV). Further analysis using transmission electron microscopy (TEM) on HSV-1 virions exposed to GDE showed significant structural damage, indicating that GDE can interfere with the viral envelope, potentially causing leakage. Moreover, GDE demonstrates antibacterial activity, albeit to a lesser extent, against notorious pathogens such as Staphylococcus aureus and Escherichia coli. Overall, this newly developed plasticizer shows significant potential as an antimicrobial agent suitable for use in both community and healthcare settings to curb the spread of infections caused by microorganisms contaminating physical surfaces.
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Affiliation(s)
- Greta Bajetto
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
- Center for Translational Research on Autoimmune and Allergic Disease—CAAD, 28100 Novara, Italy
| | - Sara Scutera
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
| | - Francesca Menotti
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
| | - Giuliana Banche
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
| | | | | | - Marco De Andrea
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
- Center for Translational Research on Autoimmune and Allergic Disease—CAAD, 28100 Novara, Italy
| | - Marta Vallino
- Institute for Sustainable Plant Protection, National Research Centre (CNR), 10135 Turin, Italy;
| | - Daan S. Van Es
- Wageningen Food & Biobased Research, 6708 WG Wageningen, The Netherlands;
| | - Matteo Biolatti
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
| | - Valentina Dell’Oste
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
| | - Tiziana Musso
- Department of Public Health and Pediatric Sciences, University of Turin, 10100 Turin, Italy; (G.B.); (S.S.); (F.M.); (G.B.); (M.D.A.); (V.D.); (T.M.)
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Mavrommatis A, Tsiplakou E, Zerva A, Pantiora PD, Georgakis ND, Tsintzou GP, Madesis P, Labrou NE. Microalgae as a Sustainable Source of Antioxidants in Animal Nutrition, Health and Livestock Development. Antioxidants (Basel) 2023; 12:1882. [PMID: 37891962 PMCID: PMC10604252 DOI: 10.3390/antiox12101882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/10/2023] [Accepted: 10/13/2023] [Indexed: 10/29/2023] Open
Abstract
Microalgae are a renewable and sustainable source of bioactive compounds, such as essential amino acids, polyunsaturated fatty acids, and antioxidant compounds, that have been documented to have beneficial effects on nutrition and health. Among these natural products, the demand for natural antioxidants, as an alternative to synthetic antioxidants, has increased. The antioxidant activity of microalgae significantly varies between species and depends on growth conditions. In the last decade, microalgae have been explored in livestock animals as feed additives with the aim of improving both animals' health and performance as well as product quality and the environmental impact of livestock. These findings are highly dependent on the composition of microalgae strain and their amount in the diet. The use of carbohydrate-active enzymes can increase nutrient bioavailability as a consequence of recalcitrant microalgae cell wall degradation, making it a promising strategy for monogastric nutrition for improving livestock productivity. The use of microalgae as an alternative to conventional feedstuffs is becoming increasingly important due to food-feed competition, land degradation, water deprivation, and climate change. However, the cost-effective production and use of microalgae is a major challenge in the near future, and their cultivation technology should be improved by reducing production costs, thus increasing profitability.
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Affiliation(s)
- Alexandros Mavrommatis
- Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, 75 Iera Odos Str., GR-11855 Athens, Greece
| | - Eleni Tsiplakou
- Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, 75 Iera Odos Str., GR-11855 Athens, Greece
| | - Anastasia Zerva
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Str., GR-11855 Athens, Greece
| | - Panagiota D Pantiora
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Str., GR-11855 Athens, Greece
| | - Nikolaos D Georgakis
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Str., GR-11855 Athens, Greece
| | - Georgia P Tsintzou
- Laboratory of Molecular Biology of Plants, School of Agricultural Sciences, University of Thessaly, GR-38221 Volos, Greece
| | - Panagiotis Madesis
- Laboratory of Molecular Biology of Plants, School of Agricultural Sciences, University of Thessaly, GR-38221 Volos, Greece
- Institute of Applied Biosciences, CERTH, 6th km Charilaou-Thermis Road, P.O. Box 361, Thermi, GR-57001 Thessaloniki, Greece
| | - Nikolaos E Labrou
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Str., GR-11855 Athens, Greece
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Osman NAHK, Abd-Elazeem OM, Al-Eisa RA, El-Shenawy NS. Anticancer and antimicrobial evaluation of extract from brown algae Hormophysa cuneiformis. J Appl Biomed 2023; 21:121-136. [PMID: 37747312 DOI: 10.32725/jab.2023.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 09/21/2023] [Indexed: 09/26/2023] Open
Abstract
AIM We investigated the antimicrobial and anticancer properties of an ethanol crude extract of Red Sea brown alga (Hormophysa cuneiformis) from Egypt. METHODS Extraction was achieved by mixing 100 g of sample powder with absolute ethanol, incubating at 37 °C overnight in a shaking incubator, and then collecting the extract. The extract's antimicrobial activity was tested using a well diffusion assay against the tested pathogens (Escherichia coli, Bacillus subtilis, Staphylococcus aureus, and Candida albicans) in comparison to commercial antibiotics. Anticancer activity was assessed using MTT assay on MCF-7, HepG-2, and HEP-2 cell lines. The anticancer mechanism of action against the HepG-2 cell line was investigated using cell cycle analysis, Annexin V, and antioxidant enzymes, in addition to transmission electron microscopy. RESULTS GC-MS phytoconstituent profile of the extract was dominant with fatty acids. A broad antimicrobial effect against all the pathogenic isolates of E. coli, S. aureus, B. subtitles, and C. albicans was demonstrated, especially at the high concentration in comparison to commercial antibiotics. The extract could inhibit the growth of the tested cell lines. We observed the most significant effect on HepG-2 cells, and the concentration of the extract played a role in the level of inhibition (IC50 of 44.6 ± 0.6 µg/ml). The extract had negligible effects on Vero normal cell lines at the lower concentration, with slight toxicity (90.8% viability) at the highest concentration (500 µg/ml). At this same concentration, the extract caused 80-92% inhibition of the cancer cell lines. The extract appears to have demonstrated promising effects on cancer cells. It induces programmed cell death (apoptosis), arrests the cell cycle, and affects the oxidative/antioxidant balance within the cells, potentially leading to the suppression or elimination of cancer cells. These findings are encouraging and may have implications for cancer treatment or further research in this area. More action of extract was seen against bacteria than fungi, with a wide antibacterial impact against all of the tested isolates, notably at the high concentration in comparison to conventional antibiotics. CONCLUSION According to the findings, H. cuneiformis may be a valuable source of chemicals that are both antimicrobial and anticancer.
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Affiliation(s)
- Nehal A H K Osman
- Suez Canal University, Faculty of Science, Botany and Microbiology Department, Ismailia 41522, Egypt
| | - Omniya M Abd-Elazeem
- Suez Canal University, Faculty of Science, Department of Zoology, Ismailia 41522, Egypt
| | - Rasha A Al-Eisa
- Taif University, College of Sciences, Department of Biology, Taif 21944, Saudi Arabia
| | - Nahla S El-Shenawy
- Suez Canal University, Faculty of Science, Department of Zoology, Ismailia 41522, Egypt
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Shin S, Tae H, Park S, Cho NJ. Lipid Membrane Remodeling by the Micellar Aggregation of Long-Chain Unsaturated Fatty Acids for Sustainable Antimicrobial Strategies. Int J Mol Sci 2023; 24:ijms24119639. [PMID: 37298587 DOI: 10.3390/ijms24119639] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/26/2023] [Accepted: 05/31/2023] [Indexed: 06/12/2023] Open
Abstract
Antimicrobial fatty acids derived from natural sources and renewable feedstocks are promising surface-active substances with a wide range of applications. Their ability to target bacterial membrane in multiple mechanisms offers a promising antimicrobial approach for combating bacterial infections and preventing the development of drug-resistant strains, and it provides a sustainable strategy that aligns with growing environmental awareness compared to their synthetic counterparts. However, the interaction and destabilization of bacterial cell membranes by these amphiphilic compounds are not yet fully understood. Here, we investigated the concentration-dependent and time-dependent membrane interaction between long-chain unsaturated fatty acids-linolenic acid (LNA, C18:3), linoleic (LLA, C18:2), and oleic acid (OA, C18:1)-and the supported lipid bilayers (SLBs) using quartz crystal microbalance-dissipation (QCM-D) and fluorescence microscopy. We first determined the critical micelle concentration (CMC) of each compound using a fluorescence spectrophotometer and monitored the membrane interaction in real time following fatty acid treatment, whereby all micellar fatty acids elicited membrane-active behavior primarily above their respective CMC values. Specifically, LNA and LLA, which have higher degrees of unsaturation and CMC values of 160 µM and 60 µM, respectively, caused significant changes in the membrane with net |Δf| shifts of 23.2 ± 0.8 Hz and 21.4 ± 0.6 Hz and ΔD shifts of 5.2 ± 0.5 × 10-6 and 7.4 ± 0.5 × 10-6. On the other hand, OA, with the lowest unsaturation degree and CMC value of 20 µM, produced relatively less membrane change with a net |Δf| shift of 14.6 ± 2.2 Hz and ΔD shift of 8.8 ± 0.2 × 10-6. Both LNA and LLA required higher concentrations than OA to initiate membrane remodeling as their CMC values increased with the degree of unsaturation. Upon incubating with fluorescence-labeled model membranes, the fatty acids induced tubular morphological changes at concentrations above CMC. Taken together, our findings highlight the critical role of self-aggregation properties and the degree of unsaturated bonds in unsaturated long-chain fatty acids upon modulating membrane destabilization, suggesting potential applications in developing sustainable and effective antimicrobial strategies.
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Affiliation(s)
- Sungmin Shin
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Hyunhyuk Tae
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Soohyun Park
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Li M, Yu J, Guo G, Shen H. Interactions between Macrophages and Biofilm during Staphylococcus aureus-Associated Implant Infection: Difficulties and Solutions. J Innate Immun 2023; 15:499-515. [PMID: 37011602 PMCID: PMC10315156 DOI: 10.1159/000530385] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Accepted: 03/16/2023] [Indexed: 04/05/2023] Open
Abstract
Staphylococcus aureus (S. aureus) biofilm is the major cause of failure of implant infection treatment that results in heavy social and economic burden on individuals, families, and communities. Planktonic S. aureus attaches to medical implant surfaces where it proliferates and is wrapped by extracellular polymeric substances, forming a solid and complex biofilm. This provides a stable environment for bacterial growth, infection maintenance, and diffusion and protects the bacteria from antimicrobial agents and the immune system of the host. Macrophages are an important component of the innate immune system and resist pathogen invasion and infection through phagocytosis, antigen presentation, and cytokine secretion. The persistence, spread, or clearance of infection is determined by interplay between macrophages and S. aureus in the implant infection microenvironment. In this review, we discuss the interactions between S. aureus biofilm and macrophages, including the effects of biofilm-related bacteria on the macrophage immune response, roles of myeloid-derived suppressor cells during biofilm infection, regulation of immune cell metabolic patterns by the biofilm environment, and immune evasion strategies adopted by the biofilm against macrophages. Finally, we summarize the current methods that support macrophage-mediated removal of biofilms and emphasize the importance of considering multi-dimensions and factors related to implant-associated infection such as immunity, metabolism, the host, and the pathogen when developing new treatments.
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Affiliation(s)
- Mingzhang Li
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jinlong Yu
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Geyong Guo
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hao Shen
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Farhan N, Rageh Al-Maleki A, Ataei S, Muhamad Sarih N, Yahya R. Synthesis, DFT study, theoretical and experimental spectroscopy of fatty amides based on extra-virgin olive oil and their antibacterial activity. Bioorg Chem 2023; 135:106511. [PMID: 37027951 DOI: 10.1016/j.bioorg.2023.106511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 04/04/2023]
Abstract
Medication products from natural materials are preferred due to their minimal side effects. Extra-virgin olive oil (EVOO) is a highly acclaimed Mediterranean diet and a common source of lipids that lowers morbidity and disease severity. This study synthesised two fatty amides from EVOO: hydroxamic fatty acids (FHA) and fatty hydrazide hydrate (FHH). The Density Functional Theory (DFT) was applied to quantum mechanics computation. Nuclear magnetic resonance (NMR), Fourier transforms infrared (FTIR), and element analysis were used to characterise fatty amides. Likewise, the minimum inhibitory concentration (MIC) and timing kill assay were determined. The results revealed that 82 % for FHA and 80 % for FHH conversion were achieved. The amidation reagent/EVOO ratio (mmol: mmol) was 7:1, using the reaction time of 12 h and hexane as an organic solvent. The results further revealed that fatty amides have high antibacterial activity with low concentration at 0.04 μg/mL during eight h of FHA and 0.3 μg/mL during ten h of FHH. This research inferred that FHA and FHH could provide an alternative and effective therapeutic strategy for bacterial diseases. Current findings could provide the basis for the modernisation/introduction of novel and more effective antibacterial drugs derived from natural products.
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Saverina EA, Frolov NA, Kamanina OA, Arlyapov VA, Vereshchagin AN, Ananikov VP. From Antibacterial to Antibiofilm Targeting: An Emerging Paradigm Shift in the Development of Quaternary Ammonium Compounds (QACs). ACS Infect Dis 2023; 9:394-422. [PMID: 36790073 DOI: 10.1021/acsinfecdis.2c00469] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
In a previous development stage, mostly individual antibacterial activity was a target in the optimization of biologically active compounds and antiseptic agents. Although this targeting is still valuable, a new trend has appeared since the discovery of superhigh resistance of bacterial cells upon their aggregation into groups. Indeed, it is now well established that the great majority of pathogenic germs are found in the environment as surface-associated microbial communities called biofilms. The protective properties of biofilms and microbial resistance, even to high concentrations of biocides, cause many chronic infections in medical settings and lead to serious economic losses in various areas. A paradigm shift from individual bacterial targeting to also affecting more complex cellular frameworks is taking place and involves multiple strategies for combating biofilms with compounds that are effective at different stages of microbiome formation. Quaternary ammonium compounds (QACs) play a key role in many of these treatments and prophylactic techniques on the basis of both the use of individual antibacterial agents and combination technologies. In this review, we summarize the literature data on the effectiveness of using commercially available and newly synthesized QACs, as well as synergistic treatment techniques based on them. As an important focus, techniques for developing and applying antimicrobial coatings that prevent the formation of biofilms on various surfaces over time are discussed. The information analyzed in this review will be useful to researchers and engineers working in many fields, including the development of a new generation of applied materials; understanding biofilm surface growth; and conducting research in medical, pharmaceutical, and materials sciences. Although regular studies of antibacterial activity are still widely conducted, a promising new trend is also to evaluate antibiofilm activity in a comprehensive study in order to meet the current requirements for the development of highly needed practical applications.
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Affiliation(s)
- Evgeniya A Saverina
- Tula State University, Lenin pr. 92, 300012 Tula, Russia.,N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, 119991 Moscow, Russia
| | - Nikita A Frolov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, 119991 Moscow, Russia
| | | | | | - Anatoly N Vereshchagin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, 119991 Moscow, Russia
| | - Valentine P Ananikov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, 119991 Moscow, Russia
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Fernandes S, Gomes IB, Simões M. Antimicrobial and antibiofilm potentiation by a triple combination of dual biocides and a phytochemical with complementary activity. Food Res Int 2023; 167:112680. [PMID: 37087211 DOI: 10.1016/j.foodres.2023.112680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/26/2023] [Accepted: 03/09/2023] [Indexed: 03/17/2023]
Abstract
The failure of current sanitation practices requires the development of effective solutions for microbial control. Although combinations using antibiotics have been extensively studied to look for additive/synergistic effects, biocide combinations are still underexplored. This study aims to evaluate the antimicrobial effectiveness of dual biocide and triple biocide/phytochemical combinations, where phytochemicals are used as quorum sensing (QS) inhibitors. The biocides selected were benzalkonium chloride (BAC) and peracetic acid (PAA) - as commonly used biocides, and glycolic acid (GA) and glyoxal (GO) - as alternative and sustainable biocides. Curcumin (CUR) and 10-undecenoic acid (UA) were the phytochemicals selected, based on their QS inhibition properties. A checkerboard assay was used for the screening of chemical interactions based on the cell growth inhibitory effects against Bacilluscereus and Pseudomonasfluorescens. It was observed that dual biocide combinations resulted in indifference, except the PAA + GA combination, which had a potential additive effect. PAA + GA + CUR and PAA + GA + UA combinations also triggered additive effects. The antimicrobial effects of the combinations were further evaluated on the inactivation of planktonic and biofilm cells after 30 min of exposure. These experiments corroborated the checkerboard results, in which PAA + GA was the most effective combination against planktonic cells (additive/synergistic effects). The antimicrobial effects of triple combinations were species- and biocide-specific. While CUR only potentiate the antimicrobial activity of GA against B.cereus, GA + UA and PAA + GA + UA combinations promoted additional antimicrobial effects against both bacteria. Biofilms were found to be highly tolerant, with modest antimicrobial effects being observed for all the combinations tested. However, this study demonstrated that low doses of biocides can be effective in bacterial control when combining biocides with a QS inhibitor, in particular, the combination of the phytochemical UA (as a QS inhibitor) with GA and PAA.
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Affiliation(s)
- Susana Fernandes
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Inês B Gomes
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Manuel Simões
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
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9
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Fady M, Rizwana H, Alarjani KM, Alghamdi MA, Ibrahim SS, Geyer J, Abbas A. Evaluation of antibiofilm and cytotoxicity effect of Rumex vesicarius methanol extract. OPEN CHEM 2023. [DOI: 10.1515/chem-2022-0286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023] Open
Abstract
Abstract
Background
Bacterial resistant to antibiotics represents an obstacle in medication management in hospitals. Biofilm can be easily formed by bacteria in indwelling medical devices. By increasing numbers of patients using indwelling medical devices, we have to find an effective antibiofilm for the eradication of biofilm-associated infections.
Methods
The present study was designed to evaluate the antibiofilm and cytotoxicity effect of methanol extract of Rumex vesicarius L. leaves (Polygonaceae). Antibacterial and antibiofilm assays were investigated in this study against different standard and pathogenic bacteria isolates from endotracheal tubes in intensive care units (Staphylococcus aureus, Staphylococcus epidermidis, Proteus vulgaris, Klebsiella pneumoniae, and Pseudomonas aeruginosa). Scanning electron microscopy was used to demonstrate the reduction of biofilm formation using methanol extract of R. vesicarius. Also, cytotoxicity of R. vesicarius L. was evaluated by using the lactate dehydrogenase assay.
Results
R. vesicarius displayed a broad spectrum and antibacterial activity against the tested organisms. The minimal inhibitory concentration of the methanol extract was 62.5–125 mg/mL for gram positive while in case of gram negative, it was 125–250 mg/mL. While the result in case of minimal bactericidal concentration was 250–500 mg/mL in case of gram positive and was 500–1,000 mg/mL in case of gram negative.
Conclusion
Our results recommend usage of R. vesicarius as a promising antibiofilm to combat infection in indwelling medical devices.
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Affiliation(s)
- Marwa Fady
- Zagazig University Hospitals, Infection Control Unit , Zagazig , 44519 , Egypt
- Department of Microbiology and Immunology, Modern University for Technology & Information, Pharmacy College , Cairo , Egypt
| | - Humaira Rizwana
- Department of Botany and Microbiology, College of Science, King Saud University , Riyadh 11451 , Saudi Arabia
| | - Khaloud Mohammed Alarjani
- Department of Botany and Microbiology, College of Science, King Saud University , Riyadh 11451 , Saudi Arabia
| | - Mai Ahmed Alghamdi
- Department of Botany and Microbiology, College of Science, King Saud University , Riyadh 11451 , Saudi Arabia
| | - Shebl Salah Ibrahim
- Department of Biochemistry, King Saud University, College of Science , Riyadh 11451 Saudi Arabia
| | - Jessica Geyer
- Department of Biology, University of Dayton , Dayton , OH 45469 , USA
| | - Ahmad Abbas
- Chest Department, Zagazig University , 44519 , Zagazig , Egypt
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Zhou H, Yang X, Yang Y, Niu Y, Li J, Fu X, Wang S, Xue B, Li C, Zhao C, Zhang X, Shen Z, Wang J, Qiu Z. Docosahexaenoic acid inhibits pheromone-responsive-plasmid-mediated conjugative transfer of antibiotic resistance genes in Enterococcus faecalis. JOURNAL OF HAZARDOUS MATERIALS 2023; 444:130390. [PMID: 36423456 DOI: 10.1016/j.jhazmat.2022.130390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 11/07/2022] [Accepted: 11/10/2022] [Indexed: 06/16/2023]
Abstract
The rapid spread of antibiotic-resistance genes (ARGs) in Enterococcus faecalis (E. faecalis) poses a great challenge to human health and ecological and environmental safety. Therefore, it is important to control the spread of ARGs. In this study, we observed that the addition of 5 μg/mL docosahexaenoic acid (DHA) reduced the conjugative transfer of pCF10 plasmid by more than 95% in E. faecalis. DHA disturbed the pheromone transport by inhibiting the mRNA levels of the prgZ gene, causing the iCF10 pheromone to accumulate in the donor bacteria and bond to the PrgX receptor to form an inhibitory phase, which resulted in the down-regulation of the expression of genes related to conjugative transfer, inhibiting biofilm formation, reducing bacterial adhesion and thus inhibiting conjugative transfer. Collectively, DHA exhibited an admirable inhibitory effect on the transfer of ARGs in E. faecalis. This study provided a technical option to control the transfer of ARGs.
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Affiliation(s)
- Hongrui Zhou
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Xiaobo Yang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Yutong Yang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Yuanyuan Niu
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Shanghai Ocean University, Shanghai 201306, China
| | - Jing Li
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Xinyue Fu
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Shanghai Ocean University, Shanghai 201306, China
| | - Shang Wang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Bin Xue
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Chenyu Li
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Chen Zhao
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Xi Zhang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Zhiqiang Shen
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Jingfeng Wang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Zhigang Qiu
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
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11
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Christodoulou C, Mavrommatis A, Loukovitis D, Symeon G, Dotas V, Kotsampasi B, Tsiplakou E. Inclusion of Camelina sativa Seeds in Ewes' Diet Modifies Rumen Microbiota. Animals (Basel) 2023; 13:ani13030377. [PMID: 36766266 PMCID: PMC9913825 DOI: 10.3390/ani13030377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/30/2022] [Accepted: 01/17/2023] [Indexed: 01/24/2023] Open
Abstract
Supplementing ruminant diets with unconventional feedstuffs (Camelina sativa seeds; CS) rich in bioactive molecules such as polyunsaturated fatty acids, may prove a potential eco-efficient strategy to manipulate rumen microbiome towards efficiency. Forty-eight ewes were divided into four homogenous groups (n = 12) according to their fat-corrected milk yield (6%), body weight, and age, and were fed individually with concentrate, alfalfa hay, and wheat straw. The concentrate of the control group (CON) had no CS inclusion, whereas the treated groups were supplemented with CS at 60 (CS6), 110 (CS11), and 160 (CS16) g·kg-1 of concentrate, respectively. Rumen digesta was collected using an esophageal tube and then liquid and solid particles were separated using cheesecloth layers. An initial bacteriome screening using next-generation sequencing of 16S was followed by specific microbes targeting with a RT-qPCR platform, which unveiled the basic changes of the rumen microbiota under CS supplementation levels. The relative abundances of Archaea and methanogens were significantly reduced in the solid particles of CS11 and CS16. Furthermore, the relative abundance of Protozoa was significantly increased in both rumen fluid and solid particles of the CS6, whereas that of Fungi was significantly reduced in the rumen particle of the CS16. In rumen fluid, the relative abundance of Fibrobacter succinogens and Ruminobacter amylophilus were significantly increased in the CS6 and CS11, respectively. In the solid particles of the CS11, the relative abundance of Ruminococcus flavefaciens was significantly reduced, whereas those of Butyrivibrio proteoclasticus and Ruminobacter amylophilus were significantly increased. Additionally, the relative abundance of Selenomonas ruminantium was significantly increased in both CS11 and CS16. Consequently, the highest CS content in the concentrate reduced the relative abundance of methanogens without inducing radical changes in rumen microorganisms that could impair ruminal fermentation and ewes' performance.
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Affiliation(s)
- Christos Christodoulou
- Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Alexandros Mavrommatis
- Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Dimitris Loukovitis
- Department of Animal Production, Fisheries and Aquaculture, School of Agricultural Sciences, University of Patras, 30200 Messolonghi, Greece
| | - George Symeon
- Research Institute of Animal Science, ELGO ‘DIMITRA’, Paralimni Giannitsa, 58100 Pella, Greece
| | - Vassilios Dotas
- Department of Animal Production, Faculty of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Basiliki Kotsampasi
- Research Institute of Animal Science, ELGO ‘DIMITRA’, Paralimni Giannitsa, 58100 Pella, Greece
| | - Eleni Tsiplakou
- Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
- Correspondence:
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12
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Prudnikov E, Polishchuk I, Sand A, Hamad HA, Massad-Ivanir N, Segal E, Pokroy B. Self-assembled fatty acid crystalline coatings display superhydrophobic antimicrobial properties. Mater Today Bio 2022; 18:100516. [PMID: 36569590 PMCID: PMC9771733 DOI: 10.1016/j.mtbio.2022.100516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 12/05/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022] Open
Abstract
Superhydrophobicity is a well-known wetting phenomenon found in numerous plants and insects. It is achieved by the combination of the surface's chemical properties and its surface roughness. Inspired by nature, numerous synthetic superhydrophobic surfaces have been developed for various applications. Designated surface coating is one of the fabrication routes to achieve the superhydrophobicity. Yet, many of these coatings, such as fluorine-based formulations, may pose severe health and environmental risks, limiting their applicability. Herein, we present a new family of superhydrophobic coatings comprised of natural saturated fatty acids, which are not only a part of our daily diet, but can be produced from renewable feedstock, providing a safe and sustainable alternative to the existing state-of-the-art. These crystalline coatings are readily fabricated via single-step deposition routes, namely thermal deposition or spray-coating. The fatty acids self-assemble into highly hierarchical crystalline structures exhibiting a water contact angle of ∼165° and contact angle hysteresis lower than 6°, while their properties and morphology depend on the specific fatty acid used as well as on the deposition technique. Moreover, the fatty acid coatings demonstrate excellent thermal stability. Importantly, this new family of coatings displays excellent anti-biofouling and antimicrobial properties against Escherichia coli and Listeria innocua, used as relevant model Gram-negative and Gram-positive bacteria, respectively. These multifunctional coatings hold immense potential for application in numerous fields, ranging from food safety to biomedicine, offering sustainable and safe solutions.
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Affiliation(s)
- Elena Prudnikov
- Department of Materials Science and Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel
| | - Iryna Polishchuk
- Department of Materials Science and Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel
| | - Andy Sand
- Faculty of Biotechnology and Food Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel
| | - Hanan Abu Hamad
- Faculty of Biotechnology and Food Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel
| | - Naama Massad-Ivanir
- Faculty of Biotechnology and Food Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel
| | - Ester Segal
- Faculty of Biotechnology and Food Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel,Corresponding author.
| | - Boaz Pokroy
- Department of Materials Science and Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel,Corresponding author.
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13
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Hamion G, Aucher W, Tardif C, Miranda J, Rouger C, Imbert C, Girardot M. Valorization of Invasive Plant Extracts against the Bispecies Biofilm Staphylococcus aureus- Candida albicans by a Bioguided Molecular Networking Screening. Antibiotics (Basel) 2022; 11:antibiotics11111595. [PMID: 36421241 PMCID: PMC9686625 DOI: 10.3390/antibiotics11111595] [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: 10/21/2022] [Revised: 11/07/2022] [Accepted: 11/09/2022] [Indexed: 11/16/2022] Open
Abstract
Invasive plants efficiently colonize non-native territories, suggesting a great production of bioactive metabolites which could be effective antibiofilm weapons. Our study aimed to look for original molecules able to inhibit bispecies biofilm formed by S. aureus and C. albicans. Extracts from five invasive macrophytes (Ludwigia peploides, Ludwigia grandiflora, Myriophyllum aquaticum, Lagarosiphon major and Egeria densa) were prepared and tested in vitro against 24 h old bispecies biofilms using a crystal violet staining (CVS) assay. The activities of the extracts reducing the biofilm total biomass by 50% or more were comparatively analyzed against each microbial species forming the biofilm by flow cytometry (FCM) and scanning electron microscopy. Extracts active against both species were fractionated. Obtained fractions were analyzed by UHPLC-MS/MS and evaluated by the CVS assay. Chemical and biological data were combined into a bioactivity-based molecular networking (BBMN) to identify active compounds. The aerial stem extract of L. grandiflora showed the highest antibiofilm activity (>50% inhibition at 50 µg∙mL−1). The biological, chemical and BBMN investigations of its fractions highlighted nine ions correlated with the antibiofilm activity. The most correlated compound, identified as betulinic acid (BA), inhibited bispecies biofilms regardless of the three tested couples of strains (ATCC strains: >40% inhibition, clinical isolates: ≈27% inhibition), confirming its antibiofilm interest.
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Affiliation(s)
- Guillaume Hamion
- Laboratoire EBI, University of Poitiers, UMR CNRS 7267, F-86000 Poitiers, France
- Correspondence:
| | - Willy Aucher
- Laboratoire EBI, University of Poitiers, UMR CNRS 7267, F-86000 Poitiers, France
| | - Charles Tardif
- University of Bordeaux, UMR INRAE 1366, Bordeaux INP, OENO, ISVV, F-33140 Villenave d’Ornon, France
- Bordeaux Sciences Agro, UMR INRAE 1366, Bordeaux INP, OENO, ISVV, F-33170 Gradignan, France
| | - Julie Miranda
- University of Bordeaux, UMR INRAE 1366, Bordeaux INP, OENO, ISVV, F-33140 Villenave d’Ornon, France
- Bordeaux Sciences Agro, UMR INRAE 1366, Bordeaux INP, OENO, ISVV, F-33170 Gradignan, France
| | - Caroline Rouger
- University of Bordeaux, UMR INRAE 1366, Bordeaux INP, OENO, ISVV, F-33140 Villenave d’Ornon, France
- Bordeaux Sciences Agro, UMR INRAE 1366, Bordeaux INP, OENO, ISVV, F-33170 Gradignan, France
- Bordeaux Metabolome, MetaboHUB, PHENOME-EMPHASIS, Centre INRAE de Nouvelle Aquitaine-Bordeaux, F-33140 Villenave d’Ornon, France
| | - Christine Imbert
- Laboratoire EBI, University of Poitiers, UMR CNRS 7267, F-86000 Poitiers, France
| | - Marion Girardot
- Laboratoire EBI, University of Poitiers, UMR CNRS 7267, F-86000 Poitiers, France
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14
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Comparison of Growth and Chemical Profile of Diatom Skeletonema grevillei in Bioreactor and Incubation-Shaking Cabinet in Two Growth Phases. Mar Drugs 2022; 20:md20110697. [PMID: 36355020 PMCID: PMC9695663 DOI: 10.3390/md20110697] [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: 10/17/2022] [Revised: 11/04/2022] [Accepted: 11/04/2022] [Indexed: 11/09/2022] Open
Abstract
Marine microalgae, diatoms, are considered a source of a wide range of high-value compounds, and numerous studies indicate their biotechnological potential in the food and feed industry, cosmetic industry, nanotechnology, pharmaceutical industry, biodiesel production, fertilizers, and wastewater treatment. The aim of this study was to compare the growth, chemical profiles, and antioxidant activity of the diatom Skeletonema grevillei cultivated in a bioreactor and an incubation-shaking cabinet at different growth phases (after 192 and 312 h). Growth was monitored by evaluating cell density with the Sedgewick Rafter chamber, and the collected biomass was extracted with 70% ethanol assisted by ultrasound. Extracts were evaporated to dryness and compounds were identified in derivatized form by gas chromatography and mass spectrometry (GC-MS) analysis, while antioxidant capacity was evaluated by DPPH and ORAC. Significantly faster growth was observed in the bioreactor than in the incubation-shaking cabinet. Oleamide, palmitelaidic acid, glycerol monostearate, myristic acid, cholesterol, eicosapentaenoic acid, 1-monopalmitin, and 24-methylene cholesterol were identified as the major compounds in both systems. Among them, oleamide was the dominant compound in both systems. It is also shown that prolonging the cultivation period had a direct effect on increasing the extract yield. The highest DPPH inhibition (11.4 ± 1%) and ORAC values (93.3 ± 8.4 mM TE) were obtained for the S. grevillei extract recovered from the bioreactor after 312 h. The obtained results contribute to the possibility of using S. grevillei for various biotechnological applications in the future.
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15
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Gu M, Cheng J, Lee YG, Cho JH, Suh JW. Discovery of Novel Iminosugar Compounds Produced by Lactobacillus paragasseri MJM60645 and Their Anti-Biofilm Activity against Streptococcus mutans. Microbiol Spectr 2022; 10:e0112222. [PMID: 35863019 PMCID: PMC9431463 DOI: 10.1128/spectrum.01122-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 06/03/2022] [Indexed: 11/20/2022] Open
Abstract
The oral cavity contains a number of microbes. They interact with each other and play an important role in human health. Among oral cariogenic microbes, Streptococcus mutans is recognized a major etiological bacteria of dental caries. Lactobacilli strains have been promoted as possible probiotic agents against S. mutans. However, their inhibitory mechanism has not been well elucidated yet. In the present study, two new compounds with strong antibiofilm activities were purified from the culture supernatant of Lactobacillus paragasseri MJM60645, which was isolated from the human oral cavity. These compounds showed strong inhibitory activities against S. mutans biofilm formation, with IC50 (concentration at which 50% biofilm was inhibited) of 30.4 μM for compound 1 and 18.9 μM for compound 2. However, these compounds did not show bactericidal activities against S. mutans. Structure elucidation by nuclear magnetic resonance (NMR) and mass spectrometry showed that compound 1 was composed of two arabinofuranose iminosugars jointed with one glycerol and oleic acid, and compound 2 was composed of two arabinofuranose iminosugars jointed with one glycerol and nervonic acid. To the best of our knowledge, these structures were discovered for the first time in this study. Treatment of S. mutans with compound 1 strongly downregulated expression levels of genes related to biofilm formation, including gtfB, gtfC, gtfD, gbpB, brpA, spaP, ftf, and smu0630 without affecting the expression of comDE or relA. This study provides new insights into novel molecules produced by Lactobacillus to regulate the pathogenesis of S. mutans, facilitating a better understanding of the mechanism for interactions between Lactobacillus and S. mutans. IMPORTANCE In this study, we isolated lactic acid bacteria that inhibit streptococcal biofilm from the oral cavity of infants and identified two novel compounds from the supernatant of their culture broth. The two compounds are structurally similar, and both consist of iminosugars, glycerol, and unsaturated fatty acid. A search of the SciFinder database revealed that these structures are novel and were discovered for the first time in this study. Mechanism studies have shown that these compounds can inhibit the expression of biofilm synthesis-related genes. This is the first report that lactic acid bacteria inhibit streptococcal biofilms by small molecules with new chemical structures. This study not only expands the understanding of natural products derived from lactic acid bacteria but also provides a new paradigm for the understanding of the interaction of bacteria in the oral microbiota.
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Affiliation(s)
- Mingkun Gu
- Interdisciplinary Program of Biomodulation, Myongji University, Yongin, Republic of Korea
| | - Jinhua Cheng
- Myongji Bioefficacy Research Center, Myongji University, Yongin, Republic of Korea
| | - Yeong-Geun Lee
- Department of Oriental Medicine Biotechnology, College of Life Sciences, Kyung Hee University, Yongin, Republic of Korea
| | - Joo-Hyung Cho
- Myongji Bioefficacy Research Center, Myongji University, Yongin, Republic of Korea
| | - Joo-Won Suh
- Myongji Bioefficacy Research Center, Myongji University, Yongin, Republic of Korea
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16
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Weber SS, de Souza ACS, Soares DCL, Lima CC, de Moraes ACR, Gkionis SV, Arenhart T, Rodrigues LGG, Ferreira SRS, Pedrosa RC, Silva DB, Paredes-Gamero EJ, Perdomo RT, Parisotto EB. Chemical profile, antimicrobial potential, and antiaggregant activity of supercritical fluid extract from Agaricus bisporus. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02308-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Targeting the Holy Triangle of Quorum Sensing, Biofilm Formation, and Antibiotic Resistance in Pathogenic Bacteria. Microorganisms 2022; 10:microorganisms10061239. [PMID: 35744757 PMCID: PMC9228545 DOI: 10.3390/microorganisms10061239] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 06/12/2022] [Accepted: 06/14/2022] [Indexed: 12/12/2022] Open
Abstract
Chronic and recurrent bacterial infections are frequently associated with the formation of biofilms on biotic or abiotic materials that are composed of mono- or multi-species cultures of bacteria/fungi embedded in an extracellular matrix produced by the microorganisms. Biofilm formation is, among others, regulated by quorum sensing (QS) which is an interbacterial communication system usually composed of two-component systems (TCSs) of secreted autoinducer compounds that activate signal transduction pathways through interaction with their respective receptors. Embedded in the biofilms, the bacteria are protected from environmental stress stimuli, and they often show reduced responses to antibiotics, making it difficult to eradicate the bacterial infection. Besides reduced penetration of antibiotics through the intricate structure of the biofilms, the sessile biofilm-embedded bacteria show reduced metabolic activity making them intrinsically less sensitive to antibiotics. Moreover, they frequently express elevated levels of efflux pumps that extrude antibiotics, thereby reducing their intracellular levels. Some efflux pumps are involved in the secretion of QS compounds and biofilm-related materials, besides being important for removing toxic substances from the bacteria. Some efflux pump inhibitors (EPIs) have been shown to both prevent biofilm formation and sensitize the bacteria to antibiotics, suggesting a relationship between these processes. Additionally, QS inhibitors or quenchers may affect antibiotic susceptibility. Thus, targeting elements that regulate QS and biofilm formation might be a promising approach to combat antibiotic-resistant biofilm-related bacterial infections.
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18
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Park S, Lee JH, Kim YG, Hu L, Lee J. Fatty Acids as Aminoglycoside Antibiotic Adjuvants Against Staphylococcus aureus. Front Microbiol 2022; 13:876932. [PMID: 35633672 PMCID: PMC9133387 DOI: 10.3389/fmicb.2022.876932] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 04/27/2022] [Indexed: 11/14/2022] Open
Abstract
Fatty acids have diverse functions in the vast majority of cells. At high doses, they act as antimicrobials while, at low doses, they exhibit antibiofilm and antivirulence activities. In this study, the synergistic antibacterial and antibiofilm activities of 30 fatty acids and 11 antibiotics were investigated against methicillin-sensitive and methicillin-resistant Staphylococcus aureus strains. Of the 15 saturated and 15 unsaturated fatty acids examined, 16 enhanced the antibacterial activity of tobramycin. Combinatorial treatment with myristoleic acid (the most active) at 10 μg/ml and tobramycin at 10 μg/ml decreased cell survival by >4 log as compared with tobramycin treatment alone. Notably, aminoglycoside antibiotics, such as tobramycin, kanamycin, gentamicin, and streptomycin exhibited antimicrobial synergy with myristoleic acid. Co-treatment with myristoleic acid and antibiotics markedly decreased biofilm formation. Interestingly, co-treatment with tobramycin and myristoleic acid induced a reduction in S. aureus cell size. These results suggest that fatty acids, particularly myristoleic acid, can be used as aminoglycoside antibiotic adjuvants against recalcitrant S. aureus infections.
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Affiliation(s)
- Sunyoung Park
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea
| | - Jin-Hyung Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea
| | - Yong-Guy Kim
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea
| | - Liangbin Hu
- School of Food & Biological Engineering, Shaanxi University of Science and Technology, Xi'an, China
| | - Jintae Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea
- *Correspondence: Jintae Lee,
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19
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Cepas V, Gutiérrez-Del-Río I, López Y, Redondo-Blanco S, Gabasa Y, Iglesias MJ, Soengas R, Fernández-Lorenzo A, López-Ibáñez S, Villar CJ, Martins CB, Ferreira JD, Assunção MFG, Santos LMA, Morais J, Castelo-Branco R, Reis MA, Vasconcelos V, López-Ortiz F, Lombó F, Soto SM. Microalgae and Cyanobacteria Strains as Producers of Lipids with Antibacterial and Antibiofilm Activity. Mar Drugs 2021; 19:md19120675. [PMID: 34940674 PMCID: PMC8709229 DOI: 10.3390/md19120675] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/19/2021] [Accepted: 11/25/2021] [Indexed: 12/16/2022] Open
Abstract
Lipids are one of the primary metabolites of microalgae and cyanobacteria, which enrich their utility in the pharmaceutical, feed, cosmetic, and chemistry sectors. This work describes the isolation, structural elucidation, and the antibiotic and antibiofilm activities of diverse lipids produced by different microalgae and cyanobacteria strains from two European collections (ACOI and LEGE-CC). Three microalgae strains and one cyanobacteria strain were selected for their antibacterial and/or antibiofilm activity after the screening of about 600 strains carried out under the NoMorFilm European project. The total organic extracts were firstly fractionated using solid phase extraction methods, and the minimum inhibitory concentration and minimal biofilm inhibitory concentration against an array of human pathogens were determined. The isolation was carried out by bioassay-guided HPLC-DAD purification, and the structure of the isolated molecules responsible for the observed activities was determined by HPLC-HRESIMS and NMR methods. Sulfoquinovosyldiacylglycerol, monogalactosylmonoacylglycerol, sulfoquinovosylmonoacylglycerol, α-linolenic acid, hexadeca-4,7,10,13-tetraenoic acid (HDTA), palmitoleic acid, and lysophosphatidylcholine were found among the different active sub-fractions selected. In conclusion, cyanobacteria and microalgae produce a great variety of lipids with antibiotic and antibiofilm activity against the most important pathogens causing severe infections in humans. The use of these lipids in clinical treatments alone or in combination with antibiotics may provide an alternative to the current treatments.
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Affiliation(s)
- Virginio Cepas
- ISGlobal, Hospital Clínic—Universitat de Barcelona, 08036 Barcelona, Spain; (V.C.); (Y.L.); (Y.G.)
| | - Ignacio Gutiérrez-Del-Río
- Research Group BIONUC (Biotechnology of Nutraceuticals and Bioactive Compounds), Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, 33006 Oviedo, Spain; (I.G.-D.-R.); (S.R.-B.); (A.F.-L.); (S.L.-I.); (C.J.V.); (F.L.)
- IUOPA (Instituto Universitario de Oncología del Principado de Asturias), Principality of Asturias, 33006 Oviedo, Spain
- ISPA (Instituto de Investigaciones Sanitarias del Principado de Asturias), Principality of Asturias, 33011 Oviedo, Spain
| | - Yuly López
- ISGlobal, Hospital Clínic—Universitat de Barcelona, 08036 Barcelona, Spain; (V.C.); (Y.L.); (Y.G.)
| | - Saúl Redondo-Blanco
- Research Group BIONUC (Biotechnology of Nutraceuticals and Bioactive Compounds), Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, 33006 Oviedo, Spain; (I.G.-D.-R.); (S.R.-B.); (A.F.-L.); (S.L.-I.); (C.J.V.); (F.L.)
- IUOPA (Instituto Universitario de Oncología del Principado de Asturias), Principality of Asturias, 33006 Oviedo, Spain
- ISPA (Instituto de Investigaciones Sanitarias del Principado de Asturias), Principality of Asturias, 33011 Oviedo, Spain
| | - Yaiza Gabasa
- ISGlobal, Hospital Clínic—Universitat de Barcelona, 08036 Barcelona, Spain; (V.C.); (Y.L.); (Y.G.)
| | - María José Iglesias
- Área de Química Orgánica, Centro de Investigación CIAIMBITAL, Universidad de Almería, 04120 Almería, Spain; (M.J.I.); (R.S.); (F.L.-O.)
| | - Raquel Soengas
- Área de Química Orgánica, Centro de Investigación CIAIMBITAL, Universidad de Almería, 04120 Almería, Spain; (M.J.I.); (R.S.); (F.L.-O.)
| | - Andrés Fernández-Lorenzo
- Research Group BIONUC (Biotechnology of Nutraceuticals and Bioactive Compounds), Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, 33006 Oviedo, Spain; (I.G.-D.-R.); (S.R.-B.); (A.F.-L.); (S.L.-I.); (C.J.V.); (F.L.)
- IUOPA (Instituto Universitario de Oncología del Principado de Asturias), Principality of Asturias, 33006 Oviedo, Spain
- ISPA (Instituto de Investigaciones Sanitarias del Principado de Asturias), Principality of Asturias, 33011 Oviedo, Spain
| | - Sara López-Ibáñez
- Research Group BIONUC (Biotechnology of Nutraceuticals and Bioactive Compounds), Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, 33006 Oviedo, Spain; (I.G.-D.-R.); (S.R.-B.); (A.F.-L.); (S.L.-I.); (C.J.V.); (F.L.)
- IUOPA (Instituto Universitario de Oncología del Principado de Asturias), Principality of Asturias, 33006 Oviedo, Spain
- ISPA (Instituto de Investigaciones Sanitarias del Principado de Asturias), Principality of Asturias, 33011 Oviedo, Spain
| | - Claudio J. Villar
- Research Group BIONUC (Biotechnology of Nutraceuticals and Bioactive Compounds), Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, 33006 Oviedo, Spain; (I.G.-D.-R.); (S.R.-B.); (A.F.-L.); (S.L.-I.); (C.J.V.); (F.L.)
- IUOPA (Instituto Universitario de Oncología del Principado de Asturias), Principality of Asturias, 33006 Oviedo, Spain
- ISPA (Instituto de Investigaciones Sanitarias del Principado de Asturias), Principality of Asturias, 33011 Oviedo, Spain
| | - Clara B. Martins
- Coimbra Collection of Algae (ACOI), Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, 3000-456 Coimbra, Portugal; (C.B.M.); (J.D.F.); (M.F.G.A.); (L.M.A.S.)
- “Molecular Physical-Chemistry” R&D Unit, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Joana D. Ferreira
- Coimbra Collection of Algae (ACOI), Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, 3000-456 Coimbra, Portugal; (C.B.M.); (J.D.F.); (M.F.G.A.); (L.M.A.S.)
| | - Mariana F. G. Assunção
- Coimbra Collection of Algae (ACOI), Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, 3000-456 Coimbra, Portugal; (C.B.M.); (J.D.F.); (M.F.G.A.); (L.M.A.S.)
| | - Lília M. A. Santos
- Coimbra Collection of Algae (ACOI), Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, 3000-456 Coimbra, Portugal; (C.B.M.); (J.D.F.); (M.F.G.A.); (L.M.A.S.)
| | - João Morais
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR), Terminal de Cruzeiros do Porto de Leixões, University of Porto, 4450-208 Matosinhos, Portugal; (J.M.); (R.C.-B.); (M.A.R.); (V.V.)
| | - Raquel Castelo-Branco
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR), Terminal de Cruzeiros do Porto de Leixões, University of Porto, 4450-208 Matosinhos, Portugal; (J.M.); (R.C.-B.); (M.A.R.); (V.V.)
| | - Mariana A. Reis
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR), Terminal de Cruzeiros do Porto de Leixões, University of Porto, 4450-208 Matosinhos, Portugal; (J.M.); (R.C.-B.); (M.A.R.); (V.V.)
| | - Vitor Vasconcelos
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR), Terminal de Cruzeiros do Porto de Leixões, University of Porto, 4450-208 Matosinhos, Portugal; (J.M.); (R.C.-B.); (M.A.R.); (V.V.)
- Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, Edifício FC4, 4169-007 Porto, Portugal
| | - Fernando López-Ortiz
- Área de Química Orgánica, Centro de Investigación CIAIMBITAL, Universidad de Almería, 04120 Almería, Spain; (M.J.I.); (R.S.); (F.L.-O.)
| | - Felipe Lombó
- Research Group BIONUC (Biotechnology of Nutraceuticals and Bioactive Compounds), Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, 33006 Oviedo, Spain; (I.G.-D.-R.); (S.R.-B.); (A.F.-L.); (S.L.-I.); (C.J.V.); (F.L.)
- IUOPA (Instituto Universitario de Oncología del Principado de Asturias), Principality of Asturias, 33006 Oviedo, Spain
- ISPA (Instituto de Investigaciones Sanitarias del Principado de Asturias), Principality of Asturias, 33011 Oviedo, Spain
| | - Sara M. Soto
- ISGlobal, Hospital Clínic—Universitat de Barcelona, 08036 Barcelona, Spain; (V.C.); (Y.L.); (Y.G.)
- Correspondence: ; Tel.: +34-932275400
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The Effect of Forage-to-Concentrate Ratio on Schizochytrium spp.-Supplemented Goats: Modifying Rumen Microbiota. Animals (Basel) 2021; 11:ani11092746. [PMID: 34573711 PMCID: PMC8466047 DOI: 10.3390/ani11092746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 09/17/2021] [Accepted: 09/17/2021] [Indexed: 02/07/2023] Open
Abstract
Simple Summary The in-depth understanding of rumen functions would be the greatest achievement of animal nutritionists. Hence, plenty of feed additives and various nutritional techniques are studied in modifying and understand the rumen habitat. In our study, we investigated the effect of alteration of the forage: concentrate (F:C) ratio in goats supplemented with the microalgae Schizochytrium spp. on rumen microbiota communities and enzymatic activity. Our results suggested that even though specific microbes’ abundance was altered, their corresponding enzymatic potential did not follow the same trend. Nonetheless, principal ruminal functions such as ammonia accumulation, fibrolytic activity, and degradation rate of specific fatty acids were also modified due to dietary intervention. Abstract The inclusion of feed additives and the implementation of various nutritional strategies are studied to modify the rumen microbiome and consequently its function. Nevertheless, rumen enzymatic activity and its intermediate products are not always matched with the microbiome structure. To further elucidate such differences a two-phase trial using twenty-two dairy goats was carried out. During the first phase, both groups (20HF n = 11; high forage and 20HG n = 11; high grain) were supplemented with 20 g Schizochytrium spp./goat/day. The 20HF group consumed a diet with a forage:concentrate (F:C) ratio of 60:40 and the 20HG-diet consisted of a F:C = 40:60. In the second phase, the supplementation level of Schizochytrium spp. was increased to 40 g/day/goat while the F:C ratio between the two groups were remained identical (40HF n = 11; high forage and 40HG n = 11; high grain). By utilizing a next-generation sequencing technology, we monitored that the high microalgae inclusion level and foremost in combination with a high grains diet increased the unmapped bacteria within the rumen. Bacteroidetes and Prevotella brevis were increased in the 40HG -fed goats as observed by using a qPCR platform. Additionally, methanogens and Methanomassiliicoccales were increased in high microalgae-fed goats, while Methanobrevibacter and Methanobacteriales were decreased. Fibrolytic bacteria were decreased in high microalgae-fed goats, while cellulolytic activity was increased. Ammonia was decreased in high grains-fed goats, while docosapentaenoic and docosahexaenoic acids showed a lower degradation rate in the rumen of high forage-fed goats. The alteration of the F:C ratio in goats supplemented with Schizochytrium spp. levels modified both ruminal microbiota and enzymatic activity. However, there was no significant consistency in the relations between them.
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Mavrommatis A, Skliros D, Flemetakis E, Tsiplakou E. Changes in the Rumen Bacteriome Structure and Enzymatic Activities of Goats in Response to Dietary Supplementation with Schizochytrium spp. Microorganisms 2021; 9:microorganisms9071528. [PMID: 34361963 PMCID: PMC8303384 DOI: 10.3390/microorganisms9071528] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 07/15/2021] [Accepted: 07/16/2021] [Indexed: 11/16/2022] Open
Abstract
With the aim to produce functional dairy products enriched with polyunsaturated fatty acids (PUFA) by using feed supplements, radical changes could occur in the rumen microbiome. This work investigated the alterations of the rumen bacteriome of goats fed with PUFA-rich marine microalgae Schizochytrium spp. For the trial, twenty-four goats were divided into four homogenous clusters (six goats/treatment) according to their fat-corrected (4%) milk yield, body weight, and age; they were individually fed with alfalfa hay and a concentrate (F/C = 50/50). The concentrate of the control group (CON) contained no microalgae, while those of the treated groups were supplemented daily with 20 (ALG20), 40 (ALG40), and 60 g (ALG60) of Schizochytrium spp./goat. Rumen fluid samples were collected using a stomach tube during the 20th and 40th days of the experiment. The microbiome analysis using a 16S rRNA sequencing platform revealed that Firmicutes were decreased in microalgae-fed goats, while Bacteroidetes showed a tendency to increase in the ALG40 group due to the enhancement of Prevotellaceae. Cellulolytic bacteria, namely Treponema bryantii, Ruminococcus gauvreauii, R. albus, and R. flavefaciens, were decreased in the ALG40 group, resulting in an overall decrease of cellulase activity. In contrast, the amylolytic potential was significantly enhanced due to an upsurge in Ruminobacter amylophilus, Succinivibrio dextrinosolvens, and Fretibacterium fastidiosum populations. In conclusion, supplementing goats’ diets with 20 g Schizochytrium spp. could be considered a sustainable and efficient nutritional strategy to modulate rumen microbiome towards the development of dairy products enriched with bioactive compounds, while higher levels induced substantial shifts in determinant microbes’ populations.
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Affiliation(s)
- Alexandros Mavrommatis
- Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, GR-11855 Athens, Greece;
| | - Dimitrios Skliros
- Laboratory of Molecular Biology, Department of Biotechnology, School of Food, Biotechnology and Development, Agricultural University of Athens, GR-11855 Athens, Greece; (D.S.); (E.F.)
| | - Emmanouil Flemetakis
- Laboratory of Molecular Biology, Department of Biotechnology, School of Food, Biotechnology and Development, Agricultural University of Athens, GR-11855 Athens, Greece; (D.S.); (E.F.)
| | - Eleni Tsiplakou
- Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, GR-11855 Athens, Greece;
- Correspondence: ; Tel.: +30-2105294435
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Changes in the Rumen Bacteriome Structure and Enzymatic Activities of Goats in Response to Dietary Supplementation with Schizochytrium spp. Microorganisms 2021. [PMID: 34361963 DOI: 10.3390/microorganisms9071528/s1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
With the aim to produce functional dairy products enriched with polyunsaturated fatty acids (PUFA) by using feed supplements, radical changes could occur in the rumen microbiome. This work investigated the alterations of the rumen bacteriome of goats fed with PUFA-rich marine microalgae Schizochytrium spp. For the trial, twenty-four goats were divided into four homogenous clusters (six goats/treatment) according to their fat-corrected (4%) milk yield, body weight, and age; they were individually fed with alfalfa hay and a concentrate (F/C = 50/50). The concentrate of the control group (CON) contained no microalgae, while those of the treated groups were supplemented daily with 20 (ALG20), 40 (ALG40), and 60 g (ALG60) of Schizochytrium spp./goat. Rumen fluid samples were collected using a stomach tube during the 20th and 40th days of the experiment. The microbiome analysis using a 16S rRNA sequencing platform revealed that Firmicutes were decreased in microalgae-fed goats, while Bacteroidetes showed a tendency to increase in the ALG40 group due to the enhancement of Prevotellaceae. Cellulolytic bacteria, namely Treponema bryantii, Ruminococcus gauvreauii, R. albus, and R. flavefaciens, were decreased in the ALG40 group, resulting in an overall decrease of cellulase activity. In contrast, the amylolytic potential was significantly enhanced due to an upsurge in Ruminobacter amylophilus, Succinivibrio dextrinosolvens, and Fretibacterium fastidiosum populations. In conclusion, supplementing goats' diets with 20 g Schizochytrium spp. could be considered a sustainable and efficient nutritional strategy to modulate rumen microbiome towards the development of dairy products enriched with bioactive compounds, while higher levels induced substantial shifts in determinant microbes' populations.
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Srinivasan R, Santhakumari S, Poonguzhali P, Geetha M, Dyavaiah M, Xiangmin L. Bacterial Biofilm Inhibition: A Focused Review on Recent Therapeutic Strategies for Combating the Biofilm Mediated Infections. Front Microbiol 2021; 12:676458. [PMID: 34054785 PMCID: PMC8149761 DOI: 10.3389/fmicb.2021.676458] [Citation(s) in RCA: 98] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 04/14/2021] [Indexed: 12/31/2022] Open
Abstract
Biofilm formation is a major concern in various sectors and cause severe problems to public health, medicine, and industry. Bacterial biofilm formation is a major persistent threat, as it increases morbidity and mortality, thereby imposing heavy economic pressure on the healthcare sector. Bacterial biofilms also strengthen biofouling, affecting shipping functions, and the offshore industries in their natural environment. Besides, they accomplish harsh roles in the corrosion of pipelines in industries. At biofilm state, bacterial pathogens are significantly resistant to external attack like antibiotics, chemicals, disinfectants, etc. Within a cell, they are insensitive to drugs and host immune responses. The development of intact biofilms is very critical for the spreading and persistence of bacterial infections in the host. Further, bacteria form biofilms on every probable substratum, and their infections have been found in plants, livestock, and humans. The advent of novel strategies for treating and preventing biofilm formation has gained a great deal of attention. To prevent the development of resistant mutants, a feasible technique that may target adhesive properties without affecting the bacterial vitality is needed. This stimulated research is a rapidly growing field for applicable control measures to prevent biofilm formation. Therefore, this review discusses the current understanding of antibiotic resistance mechanisms in bacterial biofilm and intensely emphasized the novel therapeutic strategies for combating biofilm mediated infections. The forthcoming experimental studies will focus on these recent therapeutic strategies that may lead to the development of effective biofilm inhibitors than conventional treatments.
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Affiliation(s)
- Ramanathan Srinivasan
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, School of Life Sciences, Fujian Agriculture and Forestry University, Fujian, China.,Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University), Fujian Province University, Fujian, China
| | - Sivasubramanian Santhakumari
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | | | - Mani Geetha
- PG Research and Department of Microbiology, St. Joseph's College of Arts and Science (Autonomous), Tamil Nadu, India
| | - Madhu Dyavaiah
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Lin Xiangmin
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, School of Life Sciences, Fujian Agriculture and Forestry University, Fujian, China.,Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University), Fujian Province University, Fujian, China.,Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, Fujian, China
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