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Biosynthesis method of cadmium sulfide quantum dot

A technology of biosynthesis and quantum dots, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problem of low biocompatibility of quantum dots, poor monochromaticity of quantum dots, and insufficient half-height width Narrow and other issues, to achieve the effect of uniform shape and size, low toxicity, and low cost

Inactive Publication Date: 2013-03-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical method also has many disadvantages, such as high toxicity and high cost of the preparations used, and most of them need to be reacted at high temperature, so the biocompatibility of the prepared quantum dots is not high
The hydrothermal synthesis method is currently the most used method. This method is simple to operate and low in cost, but the monochromaticity of the synthesized quantum dots is not good, the half-peak width is not narrow enough, and high temperature is required. In 2005, Wang Yongxian et al. used water Bare quantum dot cadmium sulfide synthesized by thermal method has a half-peak width of nearly 100nm

Method used

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  • Biosynthesis method of cadmium sulfide quantum dot
  • Biosynthesis method of cadmium sulfide quantum dot
  • Biosynthesis method of cadmium sulfide quantum dot

Examples

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Embodiment 1

[0022] A biosynthesis method of cadmium sulfide quantum dots of the present invention, comprising the following steps:

[0023] (1) Scrape the conidia of Phanerochaete chrysosporium BKMF-1767 (CCTCC AF96007) (other strains of the same species are applicable to the present invention) on the surface of the agar medium into distilled water, and adjust the turbidity of the suspension to 60, so that each milliliter of suspension contains 10 4 ~2.5×10 6 conidia, forming a spore suspension;

[0024] (2) Inoculate 3ml of the spore suspension into a 500ml Erlenmeyer flask filled with 200ml Kirk inorganic culture medium, and carry out shaking culture on a shaking table under the conditions of temperature 37°C, shaking speed 150r / min, and pH 7.0, After 3 days, Phanerochaete chrysosporium hyphae balls of 2 mm to 3 mm were automatically formed in the culture solution;

[0025] (3) Add 10ml of thioacetamide with a mass concentration of 0.668g / l, 0.138g of Cd(NO 3 ) 2 4H 2 0 and 1.325g...

Embodiment 2

[0031] A biosynthesis method of cadmium sulfide quantum dots of the present invention, comprising the following steps:

[0032] (1) Scrape the conidia of Phanerochaete chrysosporium BKMF-1767 (CCTCC AF96007) on the surface of the agar medium into distilled water, adjust the turbidity of the suspension to 60, so that each ml of the suspension contains 10 4 ~2.5×10 6 conidia, forming a spore suspension;

[0033] (2) Inoculate 3ml of spore suspension into a 500ml Erlenmeyer flask containing 200ml Kirk inorganic culture medium, and carry out shaking culture on a shaking table under the conditions of temperature 35°C, shaking speed 120r / min, and pH 7.0, After 3 days, Phanerochaete chrysosporium hyphae balls of 2 mm to 3 mm were automatically formed in the culture solution;

[0034] (3) Add 10ml of thioacetamide with a mass concentration of 0.668g / l, 0.082g of CdCl to the above culture medium 2 and 2.096g of mercaptosuccinic acid, the pH was adjusted to 9, the temperature was 35°...

Embodiment 3

[0037] A biosynthesis method of cadmium sulfide quantum dots of the present invention, comprising the following steps:

[0038] (1) Scrape the conidia of Phanerochaete chrysosporium BKMF-1767 (CCTCC AF96007) on the surface of the agar medium into distilled water, adjust the turbidity of the suspension to 60, so that each ml of the suspension contains 10 4 ~2.5×10 6 conidia, forming a spore suspension;

[0039] (2) Inoculate 3ml of the spore suspension into a 500ml Erlenmeyer flask filled with 200ml Kirk inorganic culture medium, and carry out shaking culture on a shaking table under the conditions of temperature 37°C, shaking speed 150r / min, and pH 7.0, After 3 days, Phanerochaete chrysosporium hyphae balls of 2 mm to 3 mm were automatically formed in the culture solution;

[0040] (3) Add 10ml of thioacetamide with a mass concentration of 0.668g / l, 0.139g of Cd(ClO 4 ) 2 and 1.077g cysteine, the pH was adjusted to 10, the temperature was 37°C, the shaking speed was 150r / m...

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Abstract

The invention discloses a Biosynthesis method of a cadmium sulfide quantum dot. The method comprises the following steps of: on the basis of taking thioacetamide as an S source, water soluble cadmium salt as a Cd source, a sulfhydryl compound as a stabilizer and a phanerochaete chrysosporium mycelium pellet as an adsorbent, adding the S source, the Cd source and the sulfhydryl compound into a culture solution which contains the phanerochaete chrysosporium mycelium pellet to carry out shake cultivation on a shaking table, and carrying out filtration, cleaning in deionized water, ultrasonication, centrifuging and purification after the cultivation to obtain the cadmium sulfide quantum dot. The method provided by the invention is simple in operation, low in cost and good in reproducibility; and the prepared cadmium sulfide quantum dot has the characteristics of low toxicity, good biocompatibility and excellent optical property.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a biosynthesis method of cadmium sulfide quantum dots. Background technique [0002] Quantum dots (quantum dots, QDs), also known as semiconductor nanocrystals, are composed of elements such as II~VI, III~V, Si, Ge, etc., and are nanoparticles whose size is within the excitonic Bohr radius. Quantum confinement effect. In recent decades, due to their unique electrical and optical properties, quantum dots have shown extremely broad application prospects in the research fields of biochemistry, molecular biology, and photovoltaic cells. Compared with traditional organic fluorescent dyes, quantum dots have The size-tunable fluorescence emission, narrow and symmetrical emission spectrum, wide and continuous absorption spectrum, and excellent photostability have made the synthesis methods of quantum dots more and more widely explored and studied. [0003] Most of the early qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P11/00C12N1/14C12R1/645
Inventor 易斌陈桂秋曾光明陈安伟杜坚坚黄健张企华官嵩李欢可尚翠周颖
Owner HUNAN UNIV
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