Rapid, One-Pot, Protein-Mediated Green Synthesis of Gold Nanostars for Computed Tomographic Imaging and Photothermal Therapy of Cancer
| Autor: | Sisini Sasidharan, Dhirendra Bahadur, Rohit Srivastava |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Nanostructure
Nanoplatform Biocompatibility Core/Shell Nanostars Photothermal Therapy General Chemical Engineering Cells Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Computed tomographic Size Environmental Chemistry Serum-Albumin Gold Nanostars Tumors Cancer Renewable Energy Sustainability and the Environment Chemistry Albumin General Chemistry Photothermal therapy 021001 nanoscience & nanotechnology 0104 chemical sciences Vivo Gold Nanoparticle Isoelectric point In-Vitro Nanoparticles Ct Imaging 0210 nano-technology Plasmonic nanostructures Macromolecule |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| DOI: | 10.1021/acssuschemeng.7b02169 |
| Popis: | Plasmonic nanostructures such as gold nanostars have immense prospects in the biomedical field. However, toxic precursors and complex methodologies of synthesis are the major obstacles to their application. This study hence makes use of a protein macromolecule (albumin) to synthesize gold nanostars by a simple reduction method. The formation of an anisotropic morphology of gold using albumin was determined to be a pH-dependent process. The net positive charge of the protein at pH below its isoelectric point facilitated the attachment of chloroaurate ions, which were subsequently reduced to gold atoms. Furthermore, the stretching of the alpha-helices of albumin at low pH and its transformation to the beta-sheet conformer favored the oriented growth of the gold nanostructures to yield a star-shaped morphology. Additionally, the non-toxic and ligand binding characteristics of the albumin endowed the gold nanostars with stability, functionality, as well as biocompatibility. The albumin-derived gold nanostars exhibited enhanced computed tomographic (CT) contrast, photothermal activity, and compatibility toward cells and human blood. This study thus puts forth, for the first time, a rapid, one-pot methodology for developing gold nanostars using protein and demonstrates the application of the resulting gold nanostars as a dual CT diagnostic and photothermal therapeutic agent. |
| Databáze: | OpenAIRE |
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