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Designing of membrane-active nano-antimicrobials based on cationic copolymer functionalized nanodiamond: Influence of hydrophilic segment on antimicrobial activity and selectivity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 92:307-316. [PMID: 30184755 DOI: 10.1016/j.msec.2018.06.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 05/10/2018] [Accepted: 06/29/2018] [Indexed: 11/24/2022]
Abstract
Designing cationic nano-antimicrobial is a promising solution for combating drug resistant microbes. In this work, hydrophilic cationic copolymer was applied for the surface functionalization of nanodiamonds (NDs) aiming at developing a highly membrane-active nano-antibacterial agent with satisfactory selectivity. As a result, after functionalization, the increased repulsive forces within NDs and interaction with solvent molecular network made the heavily aggregated pristine NDs break down into tiny nanoparticles with particle size ranging from 10 to 100 nm. The improved hydrophilicity and enlarged surface area endowed QND-H5 and QND-H10 a powerful bactericidal capability toward both of Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus). In the further bactericidal assessment, it was also demonstrated that the formation of hydrogen bonding between the 2-hydroxyethyl methacrylate (HEMA) side chains and lipid head groups of bacterial membrane also contributed to the enhanced bactericidal ability. Field emission scanning electron microscopy analysis confirmed that as-prepared nano-hybrid acted bactericidal ability via physical nature of outer membrane and cytoplasmic membrane-separating destruction mechanism toward E. coli, which may derive from the hydrogen bonding ability, making them more effective toward bacterial. More importantly, it was found that with just 10% of HEMA, QND-H10 displayed good selectivity toward bacteria over mammalian cells as shown by the high HC50 values with relatively low MIC values, suggesting the great potential application in medical fields. These results indicate that hydrogen bonding is an important element to achieve the desired high antibacterial activity and selectivity, particularly when cationic nano-antibacterial agents are required for medical application.
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Dai X, Chen X, Zhao J, Zhao Y, Guo Q, Zhang T, Chu C, Zhang X, Li C. Structure-Activity Relationship of Membrane-Targeting Cationic Ligands on a Silver Nanoparticle Surface in an Antibiotic-Resistant Antibacterial and Antibiofilm Activity Assay. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13837-13848. [PMID: 28383253 DOI: 10.1021/acsami.6b15821] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
To explore the structure-activity relationship of membrane-targeting cationic ligands on a silver nanoparticle surface in an antibiotic-resistant antibacterial and antibiofilm activity assay, a series of functionalized silver nanocomposites were synthesized. Tuning the structural configuration, molecular weight, and side-chain length of the cationic ligands on the nanoparticle surface provided silver nanocomposites with effective antibacterial activity against both antibiotic-resistant Gram-negative and Gram-positive bacteria, including bacterial biofilms. These silver nanocomposites did not trigger hemolytic activity. Significantly, the bacteria did not develop resistance to the obtained nanocomposites even after 30 generations. A study of the antibacterial mechanism confirmed that these nanocomposites could irreversibly disrupt the membrane structure of bacteria and effectively inhibit intracellular enzyme activity, ultimately leading to bacterial death. The silver nanocomposites (64 μg/mL) could eradicate 80% of an established antibiotic-resistant bacterial biofilm. The strong structure-activity relationship toward antibacterial and antibiofilm activity suggests that variations in the conformational property of the functional ligand could be valuable in the discovery of new nano-antibacterial agents for treating pathogenic bacterial infections.
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Affiliation(s)
- Xiaomei Dai
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
| | - Xuelei Chen
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
| | - Jing Zhao
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
| | - Yu Zhao
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
| | - Qianqian Guo
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
| | - Tianqi Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
| | - Chunli Chu
- College of Environmental Science and Engineering, Nankai University , Tianjin 300350, China
| | - Xinge Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
| | - Chaoxing Li
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
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Stratton TR, Applegate BM, Youngblood JP. Effect of Steric Hindrance on the Properties of Antibacterial and Biocompatible Copolymers. Biomacromolecules 2010; 12:50-6. [PMID: 21158441 DOI: 10.1021/bm1009624] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas R. Stratton
- School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, Indiana 47907, United States, and Departments of Food Science and Biological Sciences, Purdue University, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, United States
| | - Bruce M. Applegate
- School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, Indiana 47907, United States, and Departments of Food Science and Biological Sciences, Purdue University, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, United States
| | - Jeffrey P. Youngblood
- School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, Indiana 47907, United States, and Departments of Food Science and Biological Sciences, Purdue University, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, United States
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Stratton TR, Howarter JA, Allison BC, Applegate BM, Youngblood JP. Structure-activity relationships of antibacterial and biocompatible copolymers. Biomacromolecules 2010; 11:1286-90. [PMID: 20380430 DOI: 10.1021/bm1000839] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of polymers that are both bactericidal and biocompatible would have many applications and are currently of research interest. Following the development of strongly bactericidal copolymers of 4-vinylpyridine and poly(ethylene glycol) methyl ether methacrylate, biocompatibility assays have been completed on these materials to measure their potential biocompatibility. In this article, a new methodology for measuring protein interaction was developed for water-soluble polymers by coupling proteins to surfaces and then measuring the adsorption of copolymers onto these surfaces. Ellipsometry was then used to measure the thickness of adsorbed polymers as a measurement of biocompatibility. These results were then compared and correlated with the results of other biocompatibility assays previously conducted on these polymers, affording a greater understanding of the biocompatibility of the copolymers as well as improving the understanding of the effect of hydrophilic and hydrophobic groups that is vital for the development of these materials.
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Affiliation(s)
- Thomas R Stratton
- School of Materials Engineering, Purdue University, West Lafayette, Indiana, USA
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Stratton TR, Rickus JL, Youngblood JP. In Vitro Biocompatibility Studies of Antibacterial Quaternary Polymers. Biomacromolecules 2009; 10:2550-5. [PMID: 19708685 DOI: 10.1021/bm9005003] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas R. Stratton
- School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, Indiana 47907-2044, and Agricultural and Biological Engineering, Weldon School of Biomedical Engineering, and Bindley Bioscience Center, Purdue University, 206 South Martin Jischke Drive, West Lafayette, Indiana 47907-2032
| | - Jenna L. Rickus
- School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, Indiana 47907-2044, and Agricultural and Biological Engineering, Weldon School of Biomedical Engineering, and Bindley Bioscience Center, Purdue University, 206 South Martin Jischke Drive, West Lafayette, Indiana 47907-2032
| | - Jeffrey P. Youngblood
- School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, Indiana 47907-2044, and Agricultural and Biological Engineering, Weldon School of Biomedical Engineering, and Bindley Bioscience Center, Purdue University, 206 South Martin Jischke Drive, West Lafayette, Indiana 47907-2032
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