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Jeon SJ, Hu P, Kim K, Anastasia CM, Kim HI, Castillo C, Ahern CB, Pedersen JA, Fairbrother DH, Giraldo JP. Electrostatics Control Nanoparticle Interactions with Model and Native Cell Walls of Plants and Algae. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:19663-19677. [PMID: 37948609 DOI: 10.1021/acs.est.3c05686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
A lack of mechanistic understanding of nanomaterial interactions with plants and algae cell walls limits the advancement of nanotechnology-based tools for sustainable agriculture. We systematically investigated the influence of nanoparticle charge on the interactions with model cell wall surfaces built with cellulose or pectin and performed a comparative analysis with native cell walls of Arabidopsis plants and green algae (Choleochaete). The high affinity of positively charged carbon dots (CDs) (46.0 ± 3.3 mV, 4.3 ± 1.5 nm) to both model and native cell walls was dominated by the strong ionic bonding between the surface amine groups of CDs and the carboxyl groups of pectin. In contrast, these CDs formed weaker hydrogen bonding with the hydroxyl groups of cellulose model surfaces. The CDs of similar size with negative (-46.2 ± 1.1 mV, 6.6 ± 3.8 nm) or neutral (-8.6 ± 1.3 mV, 4.3 ± 1.9 nm) ζ-potentials exhibited negligible interactions with cell walls. Real-time monitoring of CD interactions with model pectin cell walls indicated higher absorption efficiency (3.4 ± 1.3 10-9) and acoustic mass density (313.3 ± 63.3 ng cm-2) for the positively charged CDs than negative and neutral counterparts (p < 0.001 and p < 0.01, respectively). The surface charge density of the positively charged CDs significantly enhanced these electrostatic interactions with cell walls, pointing to approaches to control nanoparticle binding to plant biosurfaces. Ca2+-induced cross-linking of pectin affected the initial absorption efficiency of the positively charged CD on cell wall surfaces (∼3.75 times lower) but not the accumulation of the nanoparticles on cell wall surfaces. This study developed model biosurfaces for elucidating fundamental interactions of nanomaterials with cell walls, a main barrier for nanomaterial translocation in plants and algae in the environment, and for the advancement of nanoenabled agriculture with a reduced environmental impact.
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Affiliation(s)
- Su-Ji Jeon
- Department of Botany and Plant Sciences, University of California, Riverside, California 92521, United States
| | - Peiguang Hu
- Department of Botany and Plant Sciences, University of California, Riverside, California 92521, United States
| | - Kyoungtea Kim
- Molecular and Environmental Toxicology, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States
| | - Caroline M Anastasia
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Hye-In Kim
- Department of Botany and Plant Sciences, University of California, Riverside, California 92521, United States
| | - Christopher Castillo
- Department of Botany and Plant Sciences, University of California, Riverside, California 92521, United States
| | - Colleen B Ahern
- Department of Botany and Plant Sciences, University of California, Riverside, California 92521, United States
| | - Joel A Pedersen
- Molecular and Environmental Toxicology, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States
- Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - D Howard Fairbrother
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Juan Pablo Giraldo
- Department of Botany and Plant Sciences, University of California, Riverside, California 92521, United States
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Taghizadeh SM, Ghoshoon MB, Ghasemi Y, Dehshahri A, Berenjian A, Ebrahiminezhad A. Efficiency of magnetic immobilization for recombinant Pichia pastoris cells harvesting over consecutive production cycles. SEP SCI TECHNOL 2022. [DOI: 10.1080/01496395.2022.2121725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Seyedeh-Masoumeh Taghizadeh
- Biotechnology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Pharmaceutical Biotechnology, School of Pharmacy, and Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | | | - Younes Ghasemi
- Biotechnology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Pharmaceutical Biotechnology, School of Pharmacy, and Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ali Dehshahri
- Department of Pharmaceutical Biotechnology, School of Pharmacy, and Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Aydin Berenjian
- School of Engineering, Faculty of Science and Engineering, the University of Waikato, Shiraz, Hamilton, New Zealand
- Department of Agricultural and Biological Engineering, 221 Agricultural Engineering Building, Pennsylvania State University, University Park, PA, USA
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Pöhler T, Mautner A, Aguilar-Sanchez A, Hansmann B, Kunnari V, Grönroos A, Rissanen V, Siqueira G, Mathew AP, Tammelin T. Pilot-scale modification of polyethersulfone membrane with a size and charge selective nanocellulose layer. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Safarov T, Kiran B, Bagirova M, Allahverdiyev AM, Abamor ES. An overview of nanotechnology-based treatment approaches against Helicobacter Pylori. Expert Rev Anti Infect Ther 2019; 17:829-840. [PMID: 31591930 DOI: 10.1080/14787210.2019.1677464] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Tural Safarov
- Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Bukre Kiran
- Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Melahat Bagirova
- Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Adil M Allahverdiyev
- Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Emrah Sefik Abamor
- Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul, Turkey
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Paracoccus seriniphilus adhered on surfaces: Resistance of a seawater bacterium against shear forces under the influence of roughness, surface energy, and zeta potential of the surfaces. Biointerphases 2018; 13:051003. [PMID: 30336679 DOI: 10.1116/1.5049226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Bacteria in flowing media are exposed to shear forces exerted by the fluid. Before a biofilm can be formed, the bacteria have to attach to a solid surface and have to resist these shear forces. Here, the authors determined dislodgement forces of single Paracoccus seriniphilus bacteria by means of lateral force microscopy. The first measurement set was performed on very flat glass and titanium (both as very hydrophilic samples with water contact angles below 20°) as well as highly oriented pyrolytic graphite (HOPG) and steel surfaces (both as more hydrophobic surfaces in the context of biological interaction with water contact angles above 50°). The different surfaces also show different zeta potentials in the range between -18 and -108 mV at the measurement pH of 7. The second set comprised titanium with different RMS (root mean square) roughness values from a few nanometers up to 22 nm. Lateral forces between 0.5 and 3 nN were applied. For Paracoccus seriniphilus, the authors found as a general trend that the surface energy of the substrate at comparable roughness determines the detachment process. The surface energy is inversely proportional to the initial adhesion forces of the bacterium with the surface. The higher the surface energy (and the lower the initial adhesion force) is, the easier the dislodgement of the bacteria happens. In contrast, electrostatics play only a secondary role in the lateral dislodgement of the bacteria and may come only into play if surface energies are the same. Furthermore, the surface chemistry (glass, titanium, and steel as oxidic surfaces and HOPG as a nonoxidic surface) seems to play an important role because HOPG does not completely follow the above mentioned general trend found for the oxide covered surfaces. In addition, the roughness of the substrates (made of the same material) is limiting the lateral dislodgement of the bacteria. All examined structures with RMS roughness of about 8-22 nm on titanium prevent the bacteria from the lateral dislodgement compared to polished titanium with an RMS roughness of about 3 nm.
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Zhang P, Chen YP, Peng MW, Guo JS, Shen Y, Yan P, Zhou QH, Jiang J, Fang F. Extracellular polymeric substances dependence of surface interactions of Bacillus subtilis with Cd2+ and Pb2+: An investigation combined with surface plasmon resonance and infrared spectra. Colloids Surf B Biointerfaces 2017; 154:357-364. [DOI: 10.1016/j.colsurfb.2017.03.046] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 02/09/2017] [Accepted: 03/22/2017] [Indexed: 01/23/2023]
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Green synthesis of silver, gold and silver/gold bimetallic nanoparticles using the Gloriosa superba leaf extract and their antibacterial and antibiofilm activities. Microb Pathog 2016; 101:1-11. [DOI: 10.1016/j.micpath.2016.10.011] [Citation(s) in RCA: 128] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 10/01/2016] [Accepted: 10/17/2016] [Indexed: 01/29/2023]
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Liu Z, Chan L, Chen L, Bai Y, Chen T. Facile Fabrication of Near-Infrared-Responsive and Chitosan-Functionalized Cu2
Se Nanoparticles for Cancer Photothermal Therapy. Chem Asian J 2016; 11:3032-3039. [DOI: 10.1002/asia.201600976] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Zhou Liu
- Chemistry Department; Jinan University; Guangzhou 510632 China
| | - Leung Chan
- Chemistry Department; Jinan University; Guangzhou 510632 China
| | - Liyan Chen
- Chemistry Department; Jinan University; Guangzhou 510632 China
| | - Yan Bai
- Chemistry Department; Jinan University; Guangzhou 510632 China
| | - Tianfeng Chen
- Chemistry Department; Jinan University; Guangzhou 510632 China
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Abou El Fadl FI. Synthesis and characterization of chitosan–poly(acrylamide–co-acrylic acid) magnetic nanocomposite hydrogels for use in catalysis. RUSS J APPL CHEM+ 2016. [DOI: 10.1134/s1070427216100177] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Conjugated gold nanoparticles as a tool for probing the bacterial cell envelope: The case of Shewanella oneidensis MR-1. Biointerphases 2016; 11:011003. [PMID: 26746161 DOI: 10.1116/1.4939244] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The bacterial cell envelope forms the interface between the interior of the cell and the outer world and is, thus, the means of communication with the environment. In particular, the outer cell surface mediates the adhesion of bacteria to the surface, the first step in biofilm formation. While a number of ligand-based interactions are known for the attachment process in commensal organisms and, as a result, opportunistic pathogens, the process of nonspecific attachment is thought to be mediated by colloidal, physiochemical, interactions. It is becoming clear, however, that colloidal models ignore the heterogeneity of the bacterial surface, and that the so-called nonspecific attachment may be mediated by specific regions of the cell surface, whether or not the relevant interaction is ligand-mediate. The authors introduce surface functionalized gold nanoparticles to probe the surface chemistry of Shewanella oneidensis MR-1 as it relates to surface attachment to ω-substituted alkanethiolates self-assembled monolayers (SAMs). A linear relationship between the attachment of S. oneidensis to SAM modified planar substrates and the number of similarly modified nanoparticles attached to the bacterial surfaces was demonstrated. In addition, the authors demonstrate that carboxylic acid-terminated nanoparticles attach preferentially to the subpolar region of the S. oneidensis and obliteration of that binding preference corresponds in loss of attachment to carboxylic acid terminated SAMs. Moreover, this region corresponds to suspected functional regions of the S. oneidensis surface. Because this method can be employed over large numbers of cells, this method is expected to be generally applicable for understanding cell surface organization across populations.
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Meng X, Tang W, Wang L, Wang X, Huang D, Chen H, Zhang N. Mechanism analysis of membrane fouling behavior by humic acid using atomic force microscopy: Effect of solution pH and hydrophilicity of PVDF ultrafiltration membrane interface. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.03.034] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cheng HW, Luo J, Zhong CJ. An aggregative growth process for controlling size, shape and composition of metal, alloy and core–shell nanoparticles toward desired bioapplications. J Mater Chem B 2014; 2:6904-6916. [DOI: 10.1039/c4tb00962b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Chakraborti S, Bhattacharya S, Chowdhury R, Chakrabarti P. The molecular basis of inactivation of metronidazole-resistant Helicobacter pylori using polyethyleneimine functionalized zinc oxide nanoparticles. PLoS One 2013; 8:e70776. [PMID: 23951006 PMCID: PMC3738536 DOI: 10.1371/journal.pone.0070776] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 06/22/2013] [Indexed: 01/29/2023] Open
Abstract
In view of the world wide prevalence of Helicobacter pylori infection, its potentially serious consequences, and the increasing emergence of antibiotic resistant H. pylori strains there is an urgent need for the development of alternative strategies to combat the infection. In this study it has been demonstrated that polyethyleneimine (PEI) functionalized zinc oxide (ZnO) nanoparticles (NPs) inhibit the growth of a metronidazole-resistant strain of H. pylori and the molecular basis of the anti-bacterial activity of ZnO-PEI NP has been investigated. The ZnO-PEI NP was synthesized using a wet chemical method with a core size of approximately 3–7 nm. Internalization and distribution of ZnO-PEI NP without agglomeration was observed in H. pylori cytosol by electron microscopy. Several lines of evidence including scanning electron microscopy, propidium iodide uptake and ATP assay indicate severe membrane damage in ZnO-PEI NP treated H. pylori. Intracellular ROS generation increased rapidly following the treatment of H. pylori with ZnO-PEI NP and extensive degradation of 16S and 23S rRNA was observed by quantitative reverse-transcriptase PCR. Finally, considerable synergy between ZnO-PEI NP and antibiotics was observed and it has been demonstrated that the concentration of ZnO-PEI NP (20 µg/ml) that is non-toxic to human cells could be used in combination with sub-inhibitory concentrations of antibiotics for the inhibition of H. pylori growth.
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Affiliation(s)
| | - Saurabh Bhattacharya
- Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Rukhsana Chowdhury
- Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology, Kolkata, India
- * E-mail: (RC); (PC)
| | - Pinak Chakrabarti
- Department of Biochemistry, Bose Institute, Kolkata, India
- * E-mail: (RC); (PC)
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Yu B, Zhang Y, Zheng W, Fan C, Chen T. Positive surface charge enhances selective cellular uptake and anticancer efficacy of selenium nanoparticles. Inorg Chem 2012; 51:8956-63. [PMID: 22873404 DOI: 10.1021/ic301050v] [Citation(s) in RCA: 186] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Surface charge plays a key role in cellular uptake and biological actions of nanomaterials. Selenium nanoparticles (SeNPs) are novel Se species with potent anticancer activity and low toxicity. This study constructed positively charged SeNPs by chitosan surface decoration to achieve selective cellular uptake and enhanced anticancer efficacy. The results of structure characterization revealed that hydroxyl groups in chitosan reacted with SeO(3)(2-) ion to form special chain-shaped intermediates, which could be decomposed to form crystals upon reduction by ascorbic acid. The initial colloids nucleated and then assembled into spherical SeNPs. The positive charge of the NH(3)(+) group on the outer surface of the nanoparticles contributed to the high stability in aqueous solutions. Moreover, a panel of four human cancer cell lines were found to be susceptible to SeNPs, with IC(50) values ranging from 22.7 to 49.3 μM. Chitosan surface decoration of SeNPs significantly enhanced the selective uptake by endocytosis in cancer cells and thus amplified the anticancer efficacy. Treatment of the A375 melanoma cells with chitosan-SeNPs led to dose-dependent apoptosis, as evidenced by DNA fragmentation and phosphatidylserine translocation. Our results suggest that the use of positively charged chitosan as a surface decorator could be a simple and attractive approach to achieve selective uptake and anticancer action of nanomaterials in cancer cells.
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Affiliation(s)
- Bo Yu
- Department of Chemistry, Jinan University, Guangzhou 510632, China
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Prabhawathi V, Sivakumar PM, Doble M. Green Synthesis of Protein Stabilized Silver Nanoparticles Using Pseudomonas fluorescens, a Marine Bacterium, and Its Biomedical Applications When Coated on Polycaprolactam. Ind Eng Chem Res 2012. [DOI: 10.1021/ie2029392] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang L, Luo J, Shan S, Crew E, Yin J, Zhong CJ, Wallek B, Wong S. Bacterial inactivation using silver-coated magnetic nanoparticles as functional antimicrobial agents. Anal Chem 2011; 83:8688-95. [PMID: 21999710 PMCID: PMC3413288 DOI: 10.1021/ac202164p] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The ability for silver nanoparticles to function as an antibacterial agent while being separable from the target fluids is important for bacterial inactivation in biological fluids. This report describes the analysis of the antimicrobial activities of silver-coated magnetic nanoparticles synthesized by wet chemical methods. The bacterial inactivation of several types of bacteria was analyzed, including Gram-positive bacteria ( Staphylococcus aureus and Bacillus cereus ) and Gram-negative bacteria ( Pseudomonas aeruginosa , Enterobacter cloacae , and Escherichia coli ). The results have demonstrated the viability of the silver-coated magnetic nanoparticles for achieving effective bacterial inactivation efficiency comparable to and better than that of silver nanoparticles conventionally used. The bacteria inactivation efficiency of our silver-coated MnZn ferrite (MZF@Ag) nanoparticles was also determined for blood platelets samples, demonstrating the potential of utilization in inactivating bacterial growth in platelets prior to transfusion to ensure blood product safety, which also has important implications for enabling the capability of effective separation, delivery, and targeting of the antibacterial agents.
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Affiliation(s)
- Lingyan Wang
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902
| | - Jin Luo
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902
| | - Shiyao Shan
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902
| | - Elizabeth Crew
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902
| | - Jun Yin
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902
| | - Chuan-Jian Zhong
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902
| | - Brandi Wallek
- Lynntech, Inc., 2501 Earl Rudder Frwy S., College Station, Texas 77845
| | - Season Wong
- Lynntech, Inc., 2501 Earl Rudder Frwy S., College Station, Texas 77845
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Khan SS, Mukherjee A, Chandrasekaran N. Impact of exopolysaccharides on the stability of silver nanoparticles in water. WATER RESEARCH 2011; 45:5184-5190. [PMID: 21831405 DOI: 10.1016/j.watres.2011.07.024] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2011] [Revised: 07/15/2011] [Accepted: 07/17/2011] [Indexed: 05/31/2023]
Abstract
The stability of commercial silver nanoparticles (SNPs) in aquatic environment plays a significant role in its toxicity to the environment and to human health. Here, we have studied the impact of bacterial exopolysaccharides (EPS) to the stability of engineered SNPs. When nanoparticles are present in neutral water, the nanoparticles exhibited low zeta potential and are least stable. However, in the presence of EPS (10-250 mg/L), the negative surface charge of nanoparticles increased and therefore the propensity of nanoparticles to aggregate is reduced. In UV-visible spectroscopic analysis a decrease in absorbance at plasmon peak of SNPs (425 nm) was observed till the addition of 50 mg/L of EPS, beyond that a blue shift towards 417 nm was observed. The adsorption of EPS was confirmed by Fourier-transform infrared spectroscopy. The EPS adsorbed SNPs were more stable and exhibited the zeta potential of higher than -30 mV.
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Affiliation(s)
- S Sudheer Khan
- Centre for Nano-Biotechnology, School of Bio-Sciences and Technology, VIT University, Vellore 632014, India
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Khan SS, Srivatsan P, Vaishnavi N, Mukherjee A, Chandrasekaran N. Interaction of silver nanoparticles (SNPs) with bacterial extracellular proteins (ECPs) and its adsorption isotherms and kinetics. JOURNAL OF HAZARDOUS MATERIALS 2011; 192:299-306. [PMID: 21684082 DOI: 10.1016/j.jhazmat.2011.05.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 03/31/2011] [Accepted: 05/09/2011] [Indexed: 05/30/2023]
Abstract
Indiscriminate and increased use of silver nanoparticles (SNPs) in consumer products leads to the release of it into the environment. The fate and transport of SNPs in environment remains unknown. We have studied the interaction of SNPs with extracellular protein (ECP) produced by two environmental bacterial species and the adsorption behavior in aqueous solutions. The effect of pH and salt concentrations on the adsorption was also investigated. The adsorption process was found to be dependent on surface charge (zeta potential). The capping of SNPs by ECP was confirmed by Fourier transform infrared spectroscopy and X-ray diffraction. The adsorption of ECP on SNPs was analyzed by Langmuir and Freundlich models, suggesting that the equilibrium adsorption data fitted well with Freundlich model. The equilibrium adsorption data were modeled using the pseudo-first-order and pseudo-second-order kinetic equations. The results indicated that pseudo-second-order kinetic equation would better describe the adsorption kinetics. The capping was stable at environmental pH and salt concentration. The destabilization of nanoparticles was observed at alkaline pH. The study suggests that the stabilization of nanoparticles in the environment might lead to the accumulation and transport of nanomaterials in the environment, and ultimately destabilizes the functioning of the ecosystem.
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Affiliation(s)
- S Sudheer Khan
- Centre for Nano-Biotechnology, School of Bio-Sciences and Technology, VIT University, Katpadi Road, Vellore 632014, Tamilnadu, India
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