1
|
Carvalho GC, Marena GD, Karnopp JCF, Jorge J, Sábio RM, Martines MAU, Bauab TM, Chorilli M. Cetyltrimethylammonium bromide in the synthesis of mesoporous silica nanoparticles: General aspects and in vitro toxicity. Adv Colloid Interface Sci 2022; 307:102746. [DOI: 10.1016/j.cis.2022.102746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 07/14/2022] [Accepted: 07/20/2022] [Indexed: 11/01/2022]
|
2
|
Yan Y, Li Y, Zhang Z, Wang X, Niu Y, Zhang S, Xu W, Ren C. Advances of peptides for antibacterial applications. Colloids Surf B Biointerfaces 2021; 202:111682. [PMID: 33714188 DOI: 10.1016/j.colsurfb.2021.111682] [Citation(s) in RCA: 100] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 12/09/2020] [Accepted: 03/05/2021] [Indexed: 01/08/2023]
Abstract
In the past few decades, peptide antibacterial products with unique antibacterial mechanisms have attracted widespread interest. They can effectively reduce the probability of drug resistance of bacteria and are biocompatible, so they possess tremendous development prospects. This review provides recent research and analysis on the basic types of antimicrobial peptides (including poly (amino acid)s, short AMPs, and lipopeptides) and factors to optimize antimicrobial effects. It also summarizes the two most important modes of action of antimicrobial peptides and the latest developments in the application of AMPs, including antimicrobial agent, wound healing, preservative, antibacterial coating and others. Finally, we discuss the remaining challenges to improve the antibacterial peptides and propose prospects in the field.
Collapse
Affiliation(s)
- Yuhan Yan
- School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China
| | - Yuanze Li
- School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China
| | - Zhiwen Zhang
- School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China
| | - Xinhao Wang
- School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China
| | - Yuzhong Niu
- School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China
| | - Shaohua Zhang
- School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China.
| | - Wenlong Xu
- School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China.
| | - Chunguang Ren
- Yantai Institute of Materia Medica, Yantai, 264000, China.
| |
Collapse
|
3
|
Hybrid Nanoparticles of Poly (Methyl Methacrylate) and Antimicrobial Quaternary Ammonium Surfactants. Pharmaceutics 2020; 12:pharmaceutics12040340. [PMID: 32290276 PMCID: PMC7238100 DOI: 10.3390/pharmaceutics12040340] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 04/05/2020] [Accepted: 04/08/2020] [Indexed: 12/18/2022] Open
Abstract
Quaternary ammonium surfactants (QACs) are microbicides, whereas poly (acrylates) are biocompatible polymers. Here, the physical and antimicrobial properties of two QACs, cetyl trimethyl ammonium bromide (CTAB) or dioctadecyl dimethyl ammonium bromide (DODAB) in poly (methyl methacrylate) (PMMA) nanoparticles (NPs) are compared to those of QACs alone. Methyl methacrylate (MMA) polymerization using DODAB or CTAB as emulsifiers and initiator azobisisobutyronitrile (AIBN) yielded cationic, nanometric, homodisperse, and stable NPs. NPs’ physical and antimicrobial properties were assessed from dynamic light scattering (DLS), scanning electron microscopy, and viability curves of Escherichia coli, Staphylococcus aureus, or Candida albicans determined as log(colony-forming unities counting) over a range of [QACs]. NPs were spherical and homodisperse but activity for free QACs was higher than those for QACs in NPs. Inhibition halos against bacteria and yeast were observed only for free or incorporated CTAB in NPs because PMMA/CTAB NPs controlled the CTAB release. DODAB displayed fungicidal activity against C. albicans since DODAB bilayer disks could penetrate the outer glycoproteins fungus layer. The physical properties and stability of the cationic NPs highlighted their potential to combine with other bioactive molecules for further applications in drug and vaccine delivery.
Collapse
|
4
|
Armas F, Pacor S, Ferrari E, Guida F, Pertinhez TA, Romani AA, Scocchi M, Benincasa M. Design, antimicrobial activity and mechanism of action of Arg-rich ultra-short cationic lipopeptides. PLoS One 2019; 14:e0212447. [PMID: 30789942 PMCID: PMC6383929 DOI: 10.1371/journal.pone.0212447] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 02/01/2019] [Indexed: 01/01/2023] Open
Abstract
The increasing emergence of multidrug-resistant microorganisms represents one of the greatest challenges in the clinical management of infectious diseases, and requires the development of novel antimicrobial agents. To this aim, we de novo designed a library of Arg-rich ultra-short cationic antimicrobial lipopeptides (USCLs), based on the Arg-X-Trp-Arg-NH2 peptide moiety conjugated with a fatty acid, and investigated their antibacterial potential. USCLs exhibited an excellent antimicrobial activity against clinically pathogenic microorganisms, in particular Gram-positive bacteria, including multidrug resistant strains, with MIC values ranging between 1.56 and 6.25 μg/mL. The capability of the two most active molecules, Lau-RIWR-NH2 and Lau-RRIWRR-NH2, to interact with the bacterial membranes has been predicted by molecular dynamics and verified on liposomes by surface plasmon resonance. Both compounds inhibited the growth of S. aureus even at sub MIC concentrations and induced cell membranes permeabilization by producing visible cell surface alterations leading to a significant decrease in bacterial viability. Interestingly, no cytotoxic effects were evidenced for these lipopeptides up to 50–100 μg/mL in hemolysis assay, in human epidermal model and HaCaT cells, thus highlighting a good cell selectivity. These results, together with the simple composition of USCLs, make them promising lead compounds as new antimicrobials.
Collapse
Affiliation(s)
- Federica Armas
- Department of Life Sciences, University of Trieste, Trieste, Italy
- Area Science Park, Padriciano, Trieste, Italy
| | - Sabrina Pacor
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Elena Ferrari
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Filomena Guida
- Department of Life Sciences, University of Trieste, Trieste, Italy
- Department of Engineering and Architecture, University of Trieste, Trieste, Italy
| | - Thelma A. Pertinhez
- Department of Medicine and Surgery, University of Parma, Parma, Italy
- Transfusion Medicine Unit, AUSL-IRCCS of Reggio Emilia, Reggio Emilia, Italy
| | | | - Marco Scocchi
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Monica Benincasa
- Department of Life Sciences, University of Trieste, Trieste, Italy
- * E-mail:
| |
Collapse
|
5
|
Knowles BR, Yang D, Wagner P, Maclaughlin S, Higgins MJ, Molino PJ. Zwitterion Functionalized Silica Nanoparticle Coatings: The Effect of Particle Size on Protein, Bacteria, and Fungal Spore Adhesion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1335-1345. [PMID: 30086644 DOI: 10.1021/acs.langmuir.8b01550] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The negative impacts that arise from biological fouling of surfaces have driven the development of coatings with unique physical and chemical properties that are able to prevent interactions with fouling species. Here, we report on low-fouling hydrophilic coatings presenting nanoscaled features prepared from different size silica nanoparticles (SiNPs) functionalized with zwitterionic chemistries. Zwitterionic sulfobetaine siloxane (SB) was reacted to SiNPs ranging in size from 7 to 75 nm. Particle stability and grafting density were confirmed using dynamic light scattering and thermogravimetric analysis. Thin coatings of nanoparticles were prepared by spin-coating aqueous particle suspensions. The resulting coatings were characterized using scanning electron microscopy, atomic force microscopy, and contact angle goniometry. SB functionalized particle coatings displayed increased hydrophilicity compared to unmodified particle coating controls while increasing particle size correlated with increased coating roughness and increased surface area. Coatings of zwitterated particles demonstrated a high degree of nonspecific protein resistance, as measured by quartz crystal microgravimetry. Adsorption of bovine serum albumin and hydrophobin proteins were reduced by up to 91 and 94%, respectively. Adhesion of bacteria ( Escherichia coli) to zwitterion modified particle coatings were also significantly reduced over both short and long-term assays. Maximum reductions of 97% and 94% were achieved over 2 and 24 h assay periods, respectively. For unmodified particle coatings, protein adsorption and bacterial adhesion were generally reduced with increasing particle size. Adhesion of fungal spores to SB modified SiNP coatings was also reduced, however no clear trends in relation to particle size were demonstrated.
Collapse
Affiliation(s)
- Brianna R Knowles
- ARC Industrial Transformation Research Hub for Australian Steel Manufacturing , Wollongong , New South Wales 2522 , Australia
- Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus , University of Wollongong , Wollongong , New South Wales 2500 , Australia
- BlueScope Innovation Laboratories , Old Port Road , Port Kembla , New South Wales 2505 , Australia
| | - Dan Yang
- ARC Industrial Transformation Research Hub for Australian Steel Manufacturing , Wollongong , New South Wales 2522 , Australia
- Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus , University of Wollongong , Wollongong , New South Wales 2500 , Australia
| | - Pawel Wagner
- Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus , University of Wollongong , Wollongong , New South Wales 2500 , Australia
| | - Shane Maclaughlin
- ARC Industrial Transformation Research Hub for Australian Steel Manufacturing , Wollongong , New South Wales 2522 , Australia
- BlueScope Innovation Laboratories , Old Port Road , Port Kembla , New South Wales 2505 , Australia
| | - Michael J Higgins
- ARC Industrial Transformation Research Hub for Australian Steel Manufacturing , Wollongong , New South Wales 2522 , Australia
- Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus , University of Wollongong , Wollongong , New South Wales 2500 , Australia
| | - Paul J Molino
- ARC Industrial Transformation Research Hub for Australian Steel Manufacturing , Wollongong , New South Wales 2522 , Australia
- Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus , University of Wollongong , Wollongong , New South Wales 2500 , Australia
| |
Collapse
|
6
|
Fernández Solarte AM, Villarroel-Rocha J, Morantes CF, Montes ML, Sapag K, Curutchet G, Torres Sánchez RM. Insight into surface and structural changes of montmorillonite and organomontmorillonites loaded with Ag. CR CHIM 2019. [DOI: 10.1016/j.crci.2018.09.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
7
|
Reeve PJ, Fallowfield HJ. Natural and surfactant modified zeolites: A review of their applications for water remediation with a focus on surfactant desorption and toxicity towards microorganisms. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 205:253-261. [PMID: 28992557 DOI: 10.1016/j.jenvman.2017.09.077] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 09/26/2017] [Accepted: 09/27/2017] [Indexed: 06/07/2023]
Abstract
The objective of this review is to highlight the need for further investigation of microbial toxicity caused by desorption of surfactant from Surfactant Modified Zeolite (SMZ). SMZ is a low cost, versatile permeable reactive media which has the potential to treat multiple classes of contaminants. With this combination of characteristics, SMZ has significant potential to enhance water and wastewater treatment processes. Surfactant desorption has been identified as a potential issue for the ongoing usability of SMZ. Few studies have investigated the toxicity of surfactants used in zeolite modification towards microorganisms and fewer have drawn linkages between surfactant desorption and surfactant toxicity. This review provides an overview of natural zeolite chemistry, characteristics and practical applications. The chemistry of commonly used surfactants is outlined, along with the kinetics that drive their adsorption to the zeolite surface. Methodologies to characterise this surfactant loading are also described. Applications of SMZ in water remediation are highlighted, giving focus to applications which deal with biological pollutants and where microorganisms play a role in the remediation process. Studies that have identified surfactant desorption from SMZ are outlined. Finally, the toxicity of a commonly used cationic surfactant towards microorganisms is discussed. This review highlights the potential for surfactant to desorb from the zeolite surface and the need for further research into the toxicity of this desorbed surfactant towards microorganisms, including pathogens and environmental microbes.
Collapse
Affiliation(s)
- Peter J Reeve
- Health and Environment Group, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, South Australia, 5001, Australia.
| | - Howard J Fallowfield
- Health and Environment Group, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, South Australia, 5001, Australia
| |
Collapse
|
8
|
Enhancement of lung gene delivery after aerosol: a new strategy using non-viral complexes with antibacterial properties. Biosci Rep 2017; 37:BSR20160618. [PMID: 29046368 PMCID: PMC5691145 DOI: 10.1042/bsr20160618] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 10/09/2017] [Accepted: 10/10/2017] [Indexed: 02/06/2023] Open
Abstract
The pathophysiology of obstructive pulmonary diseases, such as cystic fibrosis (CF), leads to the development of chronic infections in the respiratory tract. Thus, the symptomatic management of the disease requires, in particular, repetitive antibiotherapy. Besides these antibacterial treatments, certain pathologies, such as CF or chronic obstructive pulmonary disease (COPD), require the intake of many drugs. This simultaneous absorption may lead to undesirable drug interactions. For example, Orkambi® (lumacaftor/Ivacaftor, Vertex), a pharmacological drug employed to treat F508del patients, cannot be used with antibiotics such as rifampicin or rifabutin (rifamycin family) which are necessary to treat Mycobacteriaceae. As far as gene therapy is concerned, bacteria and/or biofilm in the airways present an additional barrier for gene transfer. Thus, aerosol administration of nanoparticles have to overcome many obstacles before allowing cellular penetration of therapeutic compounds. This review focusses on the development of aerosol formulations adapted to the respiratory tract and its multiple barriers. Then, formulations that are currently used in clinical applications are summarized depending on the active molecule delivered. Finally, we focus on new therapeutic approaches to reduce possible drug interactions by transferring the antibacterial activity to the nanocarrier while ensuring the transfection efficiency.
Collapse
|
9
|
Buzid A, Reen FJ, Langsi VK, Muimhneacháin EÓ, O'Gara F, McGlacken GP, Luong JHT, Glennon JD. Direct and Rapid Electrochemical Detection ofPseudomonas aeruginosaQuorum Signaling Molecules in Bacterial Cultures and Cystic Fibrosis Sputum Samples through Cationic Surfactant-Assisted Membrane Disruption. ChemElectroChem 2017. [DOI: 10.1002/celc.201600590] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Alyah Buzid
- Innovative Chromatography Group, Irish Separation Science Cluster (ISSC); University College Cork, Western Road, Cork (Ireland)
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF); University College Cork; College Road Cork T12 YN60 Ireland
| | - F. Jerry Reen
- BIOMERIT Research Centre, School of Microbiology; University College Cork; College Road Cork T12 YN60 Ireland
| | - Victor K. Langsi
- Innovative Chromatography Group, Irish Separation Science Cluster (ISSC); University College Cork, Western Road, Cork (Ireland)
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF); University College Cork; College Road Cork T12 YN60 Ireland
| | - Eoin Ó Muimhneacháin
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF); University College Cork; College Road Cork T12 YN60 Ireland
| | - Fergal O'Gara
- BIOMERIT Research Centre, School of Microbiology; University College Cork; College Road Cork T12 YN60 Ireland
- School of Biomedical Sciences; Curtin Health Innovation Research Curtin University; Perth WA 6845 Australia
| | - Gerard P. McGlacken
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF); University College Cork; College Road Cork T12 YN60 Ireland
| | - John H. T. Luong
- Innovative Chromatography Group, Irish Separation Science Cluster (ISSC); University College Cork, Western Road, Cork (Ireland)
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF); University College Cork; College Road Cork T12 YN60 Ireland
| | - Jeremy D. Glennon
- Innovative Chromatography Group, Irish Separation Science Cluster (ISSC); University College Cork, Western Road, Cork (Ireland)
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF); University College Cork; College Road Cork T12 YN60 Ireland
| |
Collapse
|
10
|
Le Gall T, Berchel M, Le Hir S, Fraix A, Salaün JY, Férec C, Lehn P, Jaffrès PA, Montier T. Arsonium-containing lipophosphoramides, poly-functional nano-carriers for simultaneous antibacterial action and eukaryotic cell transfection. Adv Healthc Mater 2013; 2:1513-24. [PMID: 23625809 DOI: 10.1002/adhm.201200478] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Indexed: 01/05/2023]
Abstract
Gene therapy of diseases like cystic fibrosis (CF) would consist of delivering a gene medicine towards the lungs via the respiratory tract into the target epithelial cells. Accordingly, poly-functional nano-carriers are required in order to overcome the various successive barriers of such a complex environment, such as airway colonization with bacterial strains. In this work, the antibacterial effectiveness of a series of cationic lipids is investigated before evaluating its compatibility with gene transfer into human bronchial epithelial cells. Among the various compounds considered, some bearing a trimethyl-arsonium headgroup demonstrate very potent biocide effects towards clinically relevant bacterial strains. In contrast to cationic lipids exhibiting no or insufficient antibacterial potency, arsonium-containing lipophosphoramides can simultaneously inhibit bacteria while delivering DNA into eukaryotic cells, as efficiently and safely as in absence of bacteria. Moreover, such vectors can demonstrate antibacterial activity in vitro while retaining high gene transfection efficiency to the nasal epithelium as well as to the lungs in mice in vivo. Arsonium-containing amphiphiles are the first synthetic compounds shown to achieve efficient gene delivery in the presence of bacteria, a property particularly suitable for gene therapy strategies under infected conditions such as within the airways of CF patients.
Collapse
Affiliation(s)
- Tony Le Gall
- Unité INSERM 1078; SFR ScInBioS, Université de Bretagne Occidentale, Université Européenne de Bretagne, Faculté de Médecine et des Sciences de la Santé, 22 avenue Camille Desmoulins, 29238 Brest, France.
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Lohan S, Cameotra SS, Bisht GS. Systematic Study of Non-Natural Short Cationic Lipopeptides as Novel Broad-Spectrum Antimicrobial Agents. Chem Biol Drug Des 2013; 82:557-66. [DOI: 10.1111/cbdd.12182] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 06/16/2013] [Accepted: 06/23/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Sandeep Lohan
- Department of Pharmacy; Jaypee University of Information Technology; Solan; 173234; India
| | - Swaranjit S. Cameotra
- Environmental Biotechnology & Microbial Biochemistry; Institute of Microbial Technology; Chandigarh; 160036; India
| | - Gopal S. Bisht
- Department of Pharmacy; Jaypee University of Information Technology; Solan; 173234; India
| |
Collapse
|
12
|
Carmona-Ribeiro AM, de Melo Carrasco LD. Cationic antimicrobial polymers and their assemblies. Int J Mol Sci 2013; 14:9906-46. [PMID: 23665898 PMCID: PMC3676821 DOI: 10.3390/ijms14059906] [Citation(s) in RCA: 315] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 04/20/2013] [Accepted: 04/23/2013] [Indexed: 12/21/2022] Open
Abstract
Cationic compounds are promising candidates for development of antimicrobial agents. Positive charges attached to surfaces, particles, polymers, peptides or bilayers have been used as antimicrobial agents by themselves or in sophisticated formulations. The main positively charged moieties in these natural or synthetic structures are quaternary ammonium groups, resulting in quaternary ammonium compounds (QACs). The advantage of amphiphilic cationic polymers when compared to small amphiphilic molecules is their enhanced microbicidal activity. Besides, many of these polymeric structures also show low toxicity to human cells; a major requirement for biomedical applications. Determination of the specific elements in polymers, which affect their antimicrobial activity, has been previously difficult due to broad molecular weight distributions and random sequences characteristic of radical polymerization. With the advances in polymerization control, selection of well defined polymers and structures are allowing greater insight into their structure-antimicrobial activity relationship. On the other hand, antimicrobial polymers grafted or self-assembled to inert or non inert vehicles can yield hybrid antimicrobial nanostructures or films, which can act as antimicrobials by themselves or deliver bioactive molecules for a variety of applications, such as wound dressing, photodynamic antimicrobial therapy, food packing and preservation and antifouling applications.
Collapse
Affiliation(s)
- Ana Maria Carmona-Ribeiro
- Biocolloids Lab, Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Caixa Postal 26077-05513-970, São Paulo, Brazil; E-Mail:
| | - Letícia Dias de Melo Carrasco
- Biocolloids Lab, Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Caixa Postal 26077-05513-970, São Paulo, Brazil; E-Mail:
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, CEP 05508-900, São Paulo, Brazil
| |
Collapse
|
13
|
Mohamed MH, Wilson LD, Peru KM, Headley JV. Colloidal properties of single component naphthenic acids and complex naphthenic acid mixtures. J Colloid Interface Sci 2013; 395:104-10. [DOI: 10.1016/j.jcis.2012.12.056] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 12/24/2012] [Accepted: 12/26/2012] [Indexed: 11/27/2022]
|
14
|
A 2H solid-state NMR study of the effect of antimicrobial agents on intact Escherichia coli without mutating. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:614-22. [DOI: 10.1016/j.bbamem.2012.09.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 08/30/2012] [Accepted: 09/07/2012] [Indexed: 01/13/2023]
|
15
|
Rauwel G, Leclercq L, Criquelion J, Aubry JM, Nardello-Rataj V. Aqueous mixtures of di-n-decyldimethylammonium chloride/polyoxyethylene alkyl ether: dramatic influence of tail/tail and head/head interactions on co-micellization and biocidal activity. J Colloid Interface Sci 2012; 374:176-86. [PMID: 22402182 DOI: 10.1016/j.jcis.2012.02.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 02/02/2012] [Accepted: 02/04/2012] [Indexed: 11/30/2022]
Abstract
Mixed aggregate formation and synergistic interactions of binary surfactant mixtures of di-n-decyldimethylammonium chloride, [DiC(10)][Cl], with polyoxyethylene alkyl ethers, C(i)E(j) (i=10, 12, j=4, 6, 8), have been investigated for various [DiC(10)][Cl]/C(i)E(j) ratios. The critical aggregation concentration of the binary mixtures has been determined by tensiometry, and the aggregate characteristics (i.e., size and composition, free ammonium concentration) have been estimated using the pulsed field gradient NMR spectroscopy and a [DiC(10)]-selective electrode. Diffusion coefficient measurements of micelles confirmed the synergistic interaction between the surfactants. It is thus shown that the formation of surface monolayers and mixed aggregates from [DiC(10)][Cl]/C(10)E(j) mixtures is driven by both tail/tail and head/head interactions, whereas [DiC(10)][Cl]/C(12)E(j) co-aggregation is mainly driven by tail/tail interactions. As a consequence, the co-aggregation phenomenon notably influences the biocidal activity of [DiC(10)][Cl] on the Candida albicans fungi. In the presence of C(12)E(j), the biocidal activity of the ammonium salt is inhibited due to the trapping of the cationic surfactants in the mixed aggregates, whereas in the presence of C(10)E(j), the biocidal activity of the surfactant mixture is maintained. The mode of action is also confirmed by a faster increase in the zeta potential of a C. albicans suspension in the presence of [DiC(10)][Cl]/C(10)E(8) than in the presence of [DiC(10)][Cl]/C(12)E(8). Therefore, a judicious adjustment of the alkyl (i) and polyoxyethylene (j) chain lengths of C(i)E(j) avoids its antagonistic effect on the biocidal activity of [DiC(10)][Cl].
Collapse
Affiliation(s)
- Gaétan Rauwel
- Laboratoires Anios, Pavé du Moulin, F-59260 Hellemmes Lille, France
| | | | | | | | | |
Collapse
|
16
|
Dialkylamino and nitrogen heterocyclic analogues of hexadecylphosphocholine and cetyltrimetylammonium bromide: Effect of phosphate group and environment of the ammonium cation on their biological activity. Eur J Med Chem 2009; 44:4970-7. [DOI: 10.1016/j.ejmech.2009.08.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Revised: 06/10/2009] [Accepted: 08/27/2009] [Indexed: 11/18/2022]
|
17
|
Kagle J, Porter AW, Murdoch RW, Rivera-Cancel G, Hay AG. Biodegradation of pharmaceutical and personal care products. ADVANCES IN APPLIED MICROBIOLOGY 2009; 67:65-108. [PMID: 19245937 DOI: 10.1016/s0065-2164(08)01003-4] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Medical treatments and personal hygiene lead to the steady release of pharmaceutical and personal care products (PPCPs) into the environment. Some of these PPCPs have been shown to have detrimental environmental effects and could potentially impact human health. Understanding the biological transformation of PPCPs is essential for accurately determining their ultimate environmental fate, conducting accurate risk assessments, and improving PPCP removal. We summarize the current literature concerning the biological transformation of PPCPs in wastewater treatment plants, the environment, and by pure cultures of bacterial isolates. Although some PPCPs, such as ibuprofen, are readily degraded under most studied conditions, others, such as carbamazepine, tend to be recalcitrant. This variation in the biodegradability of PPCPs can be attributed to structural differences, because PPCPs are classified by application, not chemical structure. The degradation pathways of octylphenol by Sphingomonas sp. strain PWE1, ibuprofen by Sphingomonas sp. strain Ibu-2, and DEET by Pseudomonas putida DTB are discussed in more detail.
Collapse
Affiliation(s)
- Jeanne Kagle
- Department of Biology, Mansfield University, Mansfield, Pennsylvania, USA
| | | | | | | | | |
Collapse
|
18
|
Dymond MK, Attard GS. Cationic type I amphiphiles as modulators of membrane curvature elastic stress in vivo. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:11743-11751. [PMID: 18795806 DOI: 10.1021/la8017612] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Recently we proposed that the antineoplastic properties observed in vivo for alkyl-lysophospholipid and alkylphosphocholine analogues are a direct consequence of the reduction of membrane stored elastic stress induced by these amphiphiles. Here we report similar behavior for a wide range of cationic surfactant analogues. Our systematic structure-activity studies show that the cytotoxic properties of cationic surfactants follow the same pattern of activity we observed previously for alkyl-lysophospholipid analogues, indicating a common mechanism of action that is consistent with the theory that these amphiphiles reduce membrane stored elastic stress. We note that several of the cationic surfactant compounds we have evaluated are also potent antibacterial and antifungal agents. The similarity of structure-activity relationships for cationic surfactants against microorganisms and those we have observed in eukaryotic cell lines leads us to suggest the possibility that the antibacterial and antifungal properties of cationic surfactants may also be due to modulation of membrane stored elastic stress.
Collapse
Affiliation(s)
- Marcus K Dymond
- School of Chemistry, University of Southampton, Highfield, SO17 1BJ. U.K
| | | |
Collapse
|
19
|
Vieira OV, Hartmann DO, Cardoso CMP, Oberdoerfer D, Baptista M, Santos MAS, Almeida L, Ramalho-Santos J, Vaz WLC. Surfactants as microbicides and contraceptive agents: a systematic in vitro study. PLoS One 2008; 3:e2913. [PMID: 18682796 PMCID: PMC2488369 DOI: 10.1371/journal.pone.0002913] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2008] [Accepted: 07/17/2008] [Indexed: 11/19/2022] Open
Abstract
Background The urgent need for cheap and easy-to-use protection against both unwanted pregnancies and sexually transmitted diseases has stimulated considerable interest in the use of surfactants as microbicides, anti-viral, and contraceptive agents in recent years. In the present study we report a systematic in vitro evaluation of the microbicidal, anti-viral and contraceptive potential of cationic, anionic, zwitterionic, and non-ionic surfactants. Methodology/Principal Findings Toxicity was evaluated in mammalian columnar epithelial (MDCK) cells, human sperm cells, Candida albicans, Escherichia coli, Pseudomonas aeruginosa, Neisseria gonorrhoeae, Streptococcus agalactiae and Enterococcus faecalis. The inhibition of adenovirus and lentivirus infection of MDCK cells was also tested. A homologous series of cationic surfactants, alkyl-N,N,N-trimethylammonium bromides (CnTAB), with varying alkyl chains were shown to be bactericidal and fungicidal at doses that were related to the surfactant critical micelle concentrations (CMC), all of them at concentrations significantly below the CMC. In general, bacteria were more susceptible to this surfactant group than C. albicans and this organism, in turn, was more susceptible than MDCK cells. This suggests that the CnTAB may be useful as vaginal disinfectants only in so far as bacterial and fungal infections are concerned. None of the surfactants examined, including those that have been used in pre-clinical studies, showed inhibition of adenovirus or lentivirus infection of MDCK cells or spermicidal activity at doses that were sub-toxic to MDCK cells. Conclusions/Significance The results of this study lead us to propose that systematic analysis of surfactant toxicity, such as we report in the present work, be made a mandatory pre-condition for the use of these substances in pre-clinical animal and/or human studies.
Collapse
Affiliation(s)
- Otilia V Vieira
- Centre for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.
| | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Lv J, Qian Y, Liu T, Wang Y. Synthesis and evaluation of amphiphilic cationic quinine-derived for antibacterial activity against methicillin-resistant Staphylococcus aureus. Bioorg Med Chem Lett 2007; 17:4102-6. [PMID: 17570664 DOI: 10.1016/j.bmcl.2007.05.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2007] [Revised: 04/16/2007] [Accepted: 05/18/2007] [Indexed: 11/21/2022]
Abstract
Several representative amphiphilic cationic quinine-derived have been synthesized and evaluated against methicillin- resistant Staphylococcus aureus. This is the first reported antibacterial activity of this class of compounds. In vitro the minimal inhibitory concentration values of the best compound Q7 ranged from 0.4 to 1.6 microg/mL (MBC<3.2 microg/mL).
Collapse
Affiliation(s)
- Jian Lv
- Department of Chemistry, The Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
| | | | | | | |
Collapse
|
21
|
Takenaka S, Tonoki T, Taira K, Murakami S, Aoki K. Adaptation of Pseudomonas sp. strain 7-6 to quaternary ammonium compounds and their degradation via dual pathways. Appl Environ Microbiol 2007; 73:1797-802. [PMID: 17261523 PMCID: PMC1828831 DOI: 10.1128/aem.02426-06] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pseudomonas sp. strain 7-6, isolated from active sludge obtained from a wastewater facility, utilized a quaternary ammonium surfactant, n-dodecyltrimethylammonium chloride (DTAC), as its sole carbon, nitrogen, and energy source. When initially grown in the presence of 10 mM DTAC medium, the isolate was unable to degrade DTAC. The strain was cultivated in gradually increasing concentrations of the surfactant until continuous exposure led to high tolerance and biodegradation of the compound. Based on the identification of five metabolites by gas chromatography-mass spectrometry analysis, two possible pathways for DTAC metabolism were proposed. In pathway 1, DTAC is converted to lauric acid via n-dodecanal with the release of trimethylamine; in pathway 2, DTAC is converted to lauric acid via n-dodecyldimethylamine and then n-dodecanal with the release of dimethylamine. Among the identified metabolites, the strain precultivated on DTAC medium could utilize n-dodecanal and lauric acid as sole carbon sources and trimethylamine and dimethylamine as sole nitrogen sources, but it could not efficiently utilize n-dodecyldimethylamine. These results indicated pathway 1 is the main pathway for the degradation of DTAC.
Collapse
Affiliation(s)
- Shinji Takenaka
- Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University, Rokko, Nada-ku, Kobe, Japan
| | | | | | | | | |
Collapse
|
22
|
Makovitzki A, Avrahami D, Shai Y. Ultrashort antibacterial and antifungal lipopeptides. Proc Natl Acad Sci U S A 2006; 103:15997-6002. [PMID: 17038500 PMCID: PMC1635116 DOI: 10.1073/pnas.0606129103] [Citation(s) in RCA: 377] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2006] [Indexed: 11/18/2022] Open
Abstract
Host-defense cationic antimicrobial peptides ( approximately 12-50 aa long) play an essential protective role in the innate immune system of all organisms. Lipopeptides, however, are produced only in bacteria and fungi during cultivation, and they are composed of specific lipophilic moieties attached to anionic peptides (six to seven amino acids). Here we report the following. (i) The attachment of an aliphatic chain to otherwise inert, cationic D,L tetrapeptides endows them with potent activity against various microorganisms including antibiotic resistance strains. (ii) Cell specificity is determined by the sequence of the short peptidic chain and the length of the aliphatic moiety. (iii) Despite the fact that the peptidic chains are very short, their mode of action involves permeation and disintegration of membranes, similar to that of many long antimicrobial peptides. Besides adding important information on the parameters necessary for host-defense lipopeptides to kill microorganisms, the simple composition of these lipopeptides and their diverse specificities should make them economically available, innate immunity-mimicking antimicrobial and antifungal compounds for various applications.
Collapse
Affiliation(s)
- Arik Makovitzki
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Dorit Avrahami
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yechiel Shai
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| |
Collapse
|
23
|
Marcotte L, Barbeau J, Lafleur M. Permeability and thermodynamics study of quaternary ammonium surfactants—phosphocholine vesicle system. J Colloid Interface Sci 2005; 292:219-27. [PMID: 15975586 DOI: 10.1016/j.jcis.2005.05.060] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2005] [Revised: 04/19/2005] [Accepted: 05/20/2005] [Indexed: 10/25/2022]
Abstract
Quaternary ammonium compounds (QACs) are recognized as membrane active agents widely used as biocides. The main purpose of this work was to investigate the influence of the QAC head group and acyl chain length on their permeability-perturbing power and on their affinity for lipidic membranes. Permeability perturbations were assessed by measuring the release of calcein entrapped inside vesicles. The affinity of QACs for bilayers was investigated by isothermal titration calorimetry (ITC). QACs bearing C(16) chain were found to be more efficient to decrease the membrane permeability than their C(12) analogues. On the other hand, the chemical nature of the ammonium head group has practically no influence on the permeability perturbations caused by QACs bearing C(16) chains. It was difficult to assess the partitioning of the QACs between the aqueous and lipid phases since the ITC signals could also be associated to morphological changes such as vesicle aggregation. For the systems for which reliable thermodynamic parameters could be obtained, the Gibbs energy of transfer was similar to that for the micellization. The entropy variation represented the main contribution to the Gibbs energy, indicating that the insertion of QACs inside lipidic bilayers is driven by hydrophobic interactions.
Collapse
Affiliation(s)
- Lucie Marcotte
- Department of Chemistry, Université de Montréal, Québec H3C 3J7, Canada
| | | | | |
Collapse
|
24
|
Influence of the lipid composition on the membrane affinity, and the membrane-perturbing ability of cetylpyridinium chloride. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2005.05.058] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
25
|
Haldar J, Kondaiah P, Bhattacharya S. Synthesis and Antibacterial Properties of Novel Hydrolyzable Cationic Amphiphiles. Incorporation of Multiple Head Groups Leads to Impressive Antibacterial Activity. J Med Chem 2005; 48:3823-31. [PMID: 15916434 DOI: 10.1021/jm049106l] [Citation(s) in RCA: 181] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two sets of novel multiheaded cationic amphiphiles bearing one, two, and three trimethylammonium headgroups (T1, T2, and T3) and pyridinium headgroups (P1, P2, and P3), have been synthesized and tested for antimicrobial activities against both Gram-positive and Gram-negative bacteria. The multicationic headgroups in these amphiphiles were attached covalently via scissile ester-type linkages. The results were compared with those for known surface-active, nonhydrolyzable compounds cetyltrimethylammonium bromide (CTAB) and cetylpyridinium bromide (CPB). The killing effects of the new single-headed amphiphiles (T1 and P1) were lower than those of CTAB and CPB, but with an increase in the number of headgroups in the amphiphiles, the killing effects increased for both sets of compounds. It was found that amphiphiles with triple headgroups (T3 and P3) were most active among all the amphiphiles, whereas amphiphile P1 had a very poor killing effect on both types of bacteria. The multiheaded pyridinium amphiphiles were more active compared to their trimethylammonium counterparts. The time needed to kill bacteria with multiheaded amphiphiles was significantly less than that of single-headed amphiphiles. Owing to the presence of a cleavable ester moiety, these new amphiphiles are hydrolyzed spontaneously at physiological conditions. This property enables them to be readily metabolized and therefore have the potential to be superior disinfectants and antiseptics for food and body surfaces.
Collapse
Affiliation(s)
- Jayanta Haldar
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | | | | |
Collapse
|
26
|
Campanhã MTN, Mamizuka EM, Carmona-Ribeiro AM. Interactions between Cationic Vesicles andCandidaalbicans. J Phys Chem B 2001. [DOI: 10.1021/jp003315+] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
27
|
Ahlström B, Thompson RA, Edebo L. Loss of bactericidal capacity of long-chain quaternary ammonium compounds with protein at lowered temperature. APMIS 1999; 107:606-14. [PMID: 10379689 DOI: 10.1111/j.1699-0463.1999.tb01599.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amphiphilic betaine esters are quaternary ammonium compounds (QACs) with rapid microbicidal effect, which spontaneously hydrolyze into nontoxic products. thus being referred to as soft antimicrobial agents. The bactericidal effect of 1-decyl (B10), 1-dodecyl (B12), and 1-tetradecyl (B14) betaine esters on Salmonella typhimurium was strongly influenced by temperature, pH and length of hydrocarbon chain. At pH 6.0, presence of 1.5 mM (10% w/v) BSA raised the concentration of B14 for 99% killing (BC2) from 0.006 mM to 1.8 mM. There was a stoichiometric relationship between concentration of BSA and BC2 of B14, indicating that one molecule of B14 was bound per BSA molecule when 99% killing was achieved. When the temperature was lowered to 0 degrees C only minor killing was seen in 1.5 mM BSA at the highest concentration of B14 tested, 57 mM. With B10 at 30 degrees C and pH 6.0, the presence of 1.5 mM BSA raised the bactericidal concentration (BC2) from 0.69 mM to 4.1 mM, and at 0 degrees C and 1.5 mM BSA the BC2 was 11 mM. Thus, the impairment caused of the bactericidal effect of B10 by BSA and lower temperature was less than for B14, since B14 is much more active than B10 at 30 degrees C in the absence of BSA, somewhat more active than B10 at 30 degrees C in the presence of 1.5 mM BSA, and much less active than B10 at 0 degrees C in the presence of BSA. B12 showed properties intermediate between B10 and B14. Lowered pH reduced the bactericidal effect particularly when reduced from pH 5.0 to 4.0 with B10. In the presence of 1.5 mM BSA, the bactericidal effect of 1-dodecyl (DTAB) and 1-hexadecyl (CTAB) trimethylammonium bromide decreased in the same manner as for B10 and B14, respectively. Increasing the time of incubation at 0 degrees C to 50 min, a 99% killing effect was seen with 17 mM CTAB, whereas the same killing effect was reached in 8 min with 17 mM DTAB. Binding of [3H]CTAB to S. typhimurium was also reduced at 0 degrees C in the presence of BSA. Thus, in the presence of 1.5 mM BSA, QACs with the longer hydrocarbon chain were most efficient at 30 degrees C, whereas at 0 degrees C those with the shorter hydrocarbon chain were most active. Consequently, QACs with shorter tails should be used for disinfection in the presence of proteins at lower temperatures.
Collapse
Affiliation(s)
- B Ahlström
- Department of Clinical Bacteriology, Göteborg University, Gothenburg, Sweden
| | | | | |
Collapse
|
28
|
Ahlström B, Thompson RA, Edebo L. The effect of hydrocarbon chain length, pH, and temperature on the binding and bactericidal effect of amphiphilic betaine esters on Salmonella typhimurium. APMIS 1999; 107:318-24. [PMID: 10223305 DOI: 10.1111/j.1699-0463.1999.tb01560.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Amphiphilic betaine esters are quaternary ammonium compounds (QAC) with rapid microbicidal action. They are often labeled 'soft antimicrobial agents', since the compounds hydrolyze spontaneously into betaine and fatty alcohols, thus not only losing their surface active properties and toxicity but also becoming amenable to metabolic use. The present results show that the bactericidal effects of 1-decyl (B10), 1-dodecyl (B12), and 1-tetradecyl (B14) betaine esters on Salmonella typhimurium 395 MS decreased with decreasing hydrocarbon chain lengths, decreased at pH below neutral, and were lower at 0 degrees C that at 30 degrees C. At least part of the decreased effect at pH 4.0 as compared to pH 6.0 can be explained by reduced binding. However, reduced binding cannot explain the decrease in the microbicidal effect at 0 degrees C since the binding of B 14 was the same at 0 degrees C and 30 degrees C although 10-30 times higher concentrations were required at 0 degrees C to achieve the same microbicidal effect as at 30 degrees C. Neither can differences in binding explain the great differences seen in microbicidal effect between QAC with different chain lengths. It is proposed that the membrane deformation resulting in killing of S. typhimurium is more efficiently achieved with QAC with longer hydrocarbon chains and that reduced fluidity of the outer membrane of the bacteria at lower temperatures antagonizes the bactericidal effect. Charge interaction seems to be more important for the binding and bactericidal effect for the QAC with shorter hydrocarbon chains. The different effects of pH, temperature, and hydrocarbon chain length on binding, bactericidal effect, and hydrolysis have to be taken into account when optimizing disinfection and the subsequent elimination of disinfectants.
Collapse
Affiliation(s)
- B Ahlström
- Department of Clinical Bacteriology, Göteborg University, Gothenburg, Sweden
| | | | | |
Collapse
|
29
|
Capobianco JO, Zakula D, Frost DJ, Goldman RC, Li L, Klein LL, Lartey PA. Cellular accumulation, localization, and activity of a synthetic cyclopeptamine in fungi. Antimicrob Agents Chemother 1998; 42:389-93. [PMID: 9527791 PMCID: PMC105419 DOI: 10.1128/aac.42.2.389] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
A novel synthetic cyclopeptamine, A172013, rapidly accumulated by passive diffusion into Candida albicans CCH442. Drug influx could not be totally facilitated by the membrane-bound target, beta-(1,3)-glucan synthase, since accumulation was unsaturable at drug concentrations up to 10 microg/ml (about 1.6 x 10(-7) molecules/cell), or 25x MIC. About 55 and 23% of the cell-incorporated drug was associated with the cell wall and protoplasts, respectively. Isolated microsomes contained 95% of the protoplast-associated drug, which was fully active against glucan synthesis in vitro. Drug (0.1 microg/ml) accumulation was rapid and complete after 5 min in several fungi tested, including a lipopeptide/cyclopeptamine-resistant strain of C. albicans (LP3-1). The compound penetrated to comparable levels in both yeast and hyphal forms of C. albicans, and accumulation in Aspergillus niger was 20% that in C. albicans. These data indicated that drug-cell interactions were driven by the amphiphilic nature of the compound and that the cell wall served as a major drug reservoir.
Collapse
Affiliation(s)
- J O Capobianco
- Infectious Research Division, Abbott Laboratories, Abbott Park, Illinois 60064-3500, USA.
| | | | | | | | | | | | | |
Collapse
|