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Sokolov OI, Selivanov NY, Bogatyrev VA, Selivanova OG, Velikorodnaya YI, Pocheptsov AY, Filatov BN, Shchyogolev SY, Dykman LA. Synthesis and study on activity in vitro of the high purity human butyrylcholinesterase conjugated with gold nanoparticles. DOKL BIOCHEM BIOPHYS 2016; 468:232-4. [PMID: 27417730 DOI: 10.1134/s1607672916030212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Indexed: 01/16/2023]
Abstract
The aim of this research was to design a method of immobilization of high-purity human butyrylcholinesterase on the surface of gold nanoparticles preserving the activity of the enzyme. In order to achieve this aim, the method of fractionation and purification of human butyrylcholinesterase from plasma was modified. The synthesis of 15-nm gold nanoparticles was carried out by citrated method. A method of conjugation of the high-purity butyrylcholinesterase with gold nanoparticles was developed. It was found that the Immobilization of butyrylcholinesterase on the surface of gold nanoparticles resulted in a significant (to 23%) increase in the specific activity of the enzyme.
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Affiliation(s)
- O I Sokolov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, pr. Entuziastov 13, Saratov, 410015, Russia.
| | - N Y Selivanov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, pr. Entuziastov 13, Saratov, 410015, Russia
| | - V A Bogatyrev
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, pr. Entuziastov 13, Saratov, 410015, Russia
| | - O G Selivanova
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, pr. Entuziastov 13, Saratov, 410015, Russia
| | - Y I Velikorodnaya
- Research Institute of Hygiene, Toxicology, and Occupational Pathology Federal Biomedical Agency, ul. Zemlyachki 12, Volgograd, 400048, Russia
| | - A Y Pocheptsov
- Research Institute of Hygiene, Toxicology, and Occupational Pathology Federal Biomedical Agency, ul. Zemlyachki 12, Volgograd, 400048, Russia
| | - B N Filatov
- Research Institute of Hygiene, Toxicology, and Occupational Pathology Federal Biomedical Agency, ul. Zemlyachki 12, Volgograd, 400048, Russia
| | - S Y Shchyogolev
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, pr. Entuziastov 13, Saratov, 410015, Russia
| | - L A Dykman
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, pr. Entuziastov 13, Saratov, 410015, Russia
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Waiskopf N, Ben-Shahar Y, Galchenko M, Carmel I, Moshitzky G, Soreq H, Banin U. Photocatalytic Reactive Oxygen Species Formation by Semiconductor-Metal Hybrid Nanoparticles. Toward Light-Induced Modulation of Biological Processes. NANO LETTERS 2016; 16:4266-73. [PMID: 27224678 DOI: 10.1021/acs.nanolett.6b01298] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Semiconductor-metal hybrid nanoparticles manifest efficient light-induced spatial charge separation at the semiconductor-metal interface, as demonstrated by their use for hydrogen generation via water splitting. Here, we pioneer a study of their functionality as efficient photocatalysts for the formation of reactive oxygen species. We observed enhanced photocatalytic activity forming hydrogen peroxide, superoxide, and hydroxyl radicals upon light excitation, which was significantly larger than that of the semiconductor nanocrystals, attributed to the charge separation and the catalytic function of the metal tip. We used this photocatalytic functionality for modulating the enzymatic activity of horseradish peroxidase as a model system, demonstrating the potential use of hybrid nanoparticles as active agents for controlling biological processes through illumination. The capability to produce reactive oxygen species by illumination on-demand enhances the available peroxidase-based tools for research and opens the path for studying biological processes at high spatiotemporal resolution, laying the foundation for developing novel therapeutic approaches.
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Affiliation(s)
- Nir Waiskopf
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology ‡Department of Biological Chemistry and the Edmond and Lily Safra Center of Brain Science, The Hebrew University of Jerusalem , Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Yuval Ben-Shahar
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology ‡Department of Biological Chemistry and the Edmond and Lily Safra Center of Brain Science, The Hebrew University of Jerusalem , Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Michael Galchenko
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology ‡Department of Biological Chemistry and the Edmond and Lily Safra Center of Brain Science, The Hebrew University of Jerusalem , Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Inbal Carmel
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology ‡Department of Biological Chemistry and the Edmond and Lily Safra Center of Brain Science, The Hebrew University of Jerusalem , Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Gilli Moshitzky
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology ‡Department of Biological Chemistry and the Edmond and Lily Safra Center of Brain Science, The Hebrew University of Jerusalem , Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Hermona Soreq
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology ‡Department of Biological Chemistry and the Edmond and Lily Safra Center of Brain Science, The Hebrew University of Jerusalem , Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Uri Banin
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology ‡Department of Biological Chemistry and the Edmond and Lily Safra Center of Brain Science, The Hebrew University of Jerusalem , Safra Campus, Givat Ram, Jerusalem 91904, Israel
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Ben-Shahar Y, Scotognella F, Waiskopf N, Kriegel I, Dal Conte S, Cerullo G, Banin U. Effect of surface coating on the photocatalytic function of hybrid CdS-Au nanorods. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:462-71. [PMID: 25207751 DOI: 10.1002/smll.201402262] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Indexed: 05/21/2023]
Abstract
Hybrid semiconductor-metal nanoparticles are interesting materials for use as photocatalysts due to their tunable properties and chemical processibility. Their function in the evolution of hydrogen in photocatalytic water splitting is the subject of intense current investigation. Here, the effects of the surface coatings on the photocatalytic function are studied, with Au-tipped CdS nanorods as a model hybrid nanoparticle system. Kinetic measurements of the hydrogen evolution rate following photocatalytic water reduction are performed on similar nanoparticles but with different surface coatings, including various types of thiolated alkyl ligands and different polymer coatings. The apparent hydrogen evolution quantum yields are found to strongly depend on the surface coating. The lowest yields are observed for thiolated alkyl ligands. Intermediate values are obtained with L-glutathione and poly(styrene-co-maleic anhydride) polymer coatings. The highest efficiency is obtained for polyethylenimine (PEI) polymer coating. These pronounced differences in the photocatalytic efficiencies are correlated with ultrafast transient absorption spectroscopy measurements, which show a faster bleach recovery for the PEI-coated hybrid nanoparticles, consistent with faster and more efficient charge separation. These differences are primarily attributed to the effects of surface passivation by the different coatings affecting the surface trapping of charge carriers that compete with effective charge separation required for the photocatalysis. Further support of this assignment is provided from steady-state emission and time-resolved spectral measurements, performed on related strongly fluorescing CdSe/CdS nanorods. The control and understanding of the effect of the surface coating of the hybrid nanosystems on the photocatalytic processes is of importance for the potential application of hybrid nanoparticles as photocatalysts.
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Affiliation(s)
- Yuval Ben-Shahar
- The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
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