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Benková Z, Čakánek P, Cordeiro MNDS. Adsorption of Peptides onto Carbon Nanotubes Grafted with Poly(ethylene Oxide) Chains: A Molecular Dynamics Simulation Study. Nanomaterials (Basel) 2022; 12:3795. [PMID: 36364570 PMCID: PMC9655739 DOI: 10.3390/nano12213795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 10/17/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
Carbon nanotubes (CNTs) display exceptional properties that predispose them to wide use in technological or biomedical applications. To remove the toxicity of CNTs and to protect them against undesired protein adsorption, coverage of the CNT sidewall with poly(ethylene oxide) (PEO) is often considered. However, controversial results on the antifouling effectiveness of PEO layers have been reported so far. In this work, the interactions of pristine CNT and CNT covered with the PEO chains at different grafting densities with polyglycine, polyserine, and polyvaline are studied using molecular dynamics simulations in vacuum, water, and saline environments. The peptides are adsorbed on CNT in all investigated systems; however, the adsorption strength is reduced in aqueous environments. Save for one case, addition of NaCl at a physiological concentration to water does not appreciably influence the adsorption and structure of the peptides or the grafted PEO layer. It turns out that the flexibility of the peptide backbone allows the peptide to adopt more asymmetric conformations which may be inserted deeper into the grafted PEO layer. Water molecules disrupt the internal hydrogen bonds in the peptides, as well as the hydrogen bonds formed between the peptides and the PEO chains.
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Affiliation(s)
- Zuzana Benková
- Polymer Institute, Slovak Academy of Sciences, Dúbravská Cesta 9, 845 41 Bratislava, Slovakia
| | - Peter Čakánek
- Polymer Institute, Slovak Academy of Sciences, Dúbravská Cesta 9, 845 41 Bratislava, Slovakia
| | - Maria Natália D. S. Cordeiro
- LAQV@REQUIMTE, Department of Chemistry and Biochemistry, University of Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
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Khan MAR, Wang BW, Chen YY, Lin TH, Lin HC, Yang YL, Pang KL, Liaw CC. Natural polyketide 6-pentyl-2 H-pyrone-2-one and its synthetic analogues efficiently prevent marine biofouling. Biofouling 2021; 37:257-266. [PMID: 33870823 DOI: 10.1080/08927014.2021.1890043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 01/29/2021] [Accepted: 02/01/2021] [Indexed: 06/12/2023]
Abstract
Biofouling is a widespread phenomenon in oceans worldwide. With increasing human development and activities in open and coastal waters, and due to the environmental impact of AF organotins and copper-based paint, the demand for nontoxic antifouling (AF) paints is increasing. Various bioassays for antimicrobial activity, anti-biofilm formation and anti-barnacle settlement were established to evaluate the possibility of using marine natural products as AF agents. A series of natural products, isolated from the marine-derived fungi Trichoderma atroviride and T. reesei, were evaluated for their AF activity. One pyrone-type compound (1) demonstrated significant inhibitory activities toward barnacle cyprid settlement. Furthermore, a series of pyrone analogues (S1-S6) were synthesized, and their bioactivities were evaluated in the established systems. The results showed that compounds S5 and S6 exhibited a broad spectrum of bioactivities, such as anti-barnacle settlement, anti-biofilm formation and antimicrobial activities.
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Affiliation(s)
- Mo Aqib Raza Khan
- Department of Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
| | - Bo-Wei Wang
- Doctoral Degree Program in Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
| | - Yih-Yu Chen
- Department of Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
| | - Ting-Hsuan Lin
- Department of Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
| | - Hsiu-Chin Lin
- Department of Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
- Doctoral Degree Program in Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
| | - Yu-Liang Yang
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan, ROC
| | - Ka-Lai Pang
- Institute of Marine Biology and Centre of Excellence for the Oceans, National Taiwan Ocean University, Keelung, Taiwan, ROC
| | - Chih-Chuang Liaw
- Department of Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
- Doctoral Degree Program in Marine Biotechnology, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan, ROC
- Graduate Institute of Pharmacognosy, Taipei Medical University, Taipei, Taiwan, ROC
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