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Martinaga, Lela; Ludwig, Roland; Rezić, Iva; Andlar, Martina; Pum, Dietmar; Vrsalović Presečki, Ana
Applied microbiology and biotechnology, 12/2024, Letnik: 108, Številka: 1Journal Article
In this work the green synthesis of gold nanoparticles (Au-NPs) using the oxidoreductive enzymes Myriococcum thermophilum cellobiose dehydrogenase ( Mt CDH), Glomerella cingulata glucose dehydrogenase ( Gc GDH), and Aspergillus niger glucose oxidase ( An GOX)) as bioreductants was investigated. The influence of reaction conditions on the synthesis of Au-NPs was examined and optimised. The reaction kinetics and the influence of Au ions on the reaction rate were determined. Based on the kinetic study, the mechanism of Au-NP synthesis was proposed. The Au-NPs were characterized by UV–Vis spectroscopy and transmission electron microscopy (TEM). The surface plasmon resonance (SPR) absorption peaks of the Au-NPs synthesised with Mt CDH and Gc GDH were observed at 535 nm, indicating an average size of around 50 nm. According to the image analysis performed on a TEM micrograph, the Au-NPs synthesized with Gc GDH have a spherical shape with an average size of 2.83 and 6.63 nm after 24 and 48 h of the reaction, respectively. Key points • The Au NPs were synthesised by the action of enzymes CDH and GDH. • The synthesis of Au-NPs by CDH is related to the oxidation of cellobiose. • The synthesis of Au-NPs by GDH was not driven by the reaction kinetic. Graphical Abstract
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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