High-Yield Extracellular Biosynthesis of ZnS Quantum Dots through a Unique Molecular Mediation Mechanism by the Peculiar Extracellular Proteins Secreted by a Mixed Sulfate Reducing Bacteria
| Autor: | Tianqi Niu, Baoping Xin, Shuhui Yang, Shiyue Qi, Chen Ji, Yufei Yang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Absorption (pharmacology)
Materials science Stereochemistry Static Electricity 0211 other engineering and technologies 02 engineering and technology Sulfides chemistry.chemical_compound Bacterial Proteins Biosynthesis Quantum Dots Mole Phytochelatins Extracellular General Materials Science Amino Acids Sulfate-reducing bacteria chemistry.chemical_classification 021110 strategic defence & security studies Bacteria Molecular mass Sulfates 021001 nanoscience & nanotechnology Amino acid chemistry Zinc Compounds Yield (chemistry) Metallothionein Adsorption 0210 nano-technology Hydrophobic and Hydrophilic Interactions |
| Zdroj: | ACS Applied Materials & Interfaces. 11:10442-10451 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.8b18574 |
| Popis: | This work describes a high-yield extracellular biosynthesis of ZnS QDs via a unique molecular mediation mechanism driven by the mixed sulfate reducing bacteria (SRB). The mixed SRB have obtained the highest ever ZnS QD biosynthesis rate of 35.0–45.0 g/(L·month). The biogenic ZnS QDs with an average crystallite size (ACS) of 6.5 nm have greater PL activity and better uniformity than that of a chemical route. Peculiar extracellular proteins (EPs) with molecular weights of approximately 65 and 14 kDa specially adhere to the ZnS QDs, which cover extraordinarily high contents of acidic amino acids (14.0 mol % Glu and 13.0 mol % Asp) and of nonpolar amino acids (12.0 mol % Ala, 11.0 mol % Gly, and 7.0 mol % Phe), for novel molecular mediation. The vast amount of negative charges in Glu and Asp guides the strong absorption between the EPs and Zn2+ via electrostatic attraction to reach a maximum absorption capacity of 745.9 mg/g within 2.0 h, motivating large and rapid nucleation as the first step of biosynthesis... |
| Databáze: | OpenAIRE |
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