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A kind of method that uses short amylose as template to prepare water-soluble nano-silver

A short amylose and water-soluble technology, which is applied in the field of preparing water-soluble nano-silver, can solve the problems of large diameter, reduced stability of aqueous solution, and uneven growth, and achieve the effects of short reaction time, easy operation, and low preparation cost

Active Publication Date: 2016-10-26
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the prior art, the short amylose granules of biological enzymolysis are used as templates to prepare nano-silver with a small particle size and can be rapidly dissolved in water, and the reducing agent disclosed in the prior art is due to The resulting crystal nuclei are small, and a large number of silver ions grow on a small number of crystal nuclei, resulting in a larger diameter, uneven growth, and reduced stability of the aqueous solution

Method used

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  • A kind of method that uses short amylose as template to prepare water-soluble nano-silver
  • A kind of method that uses short amylose as template to prepare water-soluble nano-silver
  • A kind of method that uses short amylose as template to prepare water-soluble nano-silver

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Effect test

Embodiment 1

[0023] A method for preparing water-soluble nano-silver with short amylose as a template, the steps are:

[0024] Preparation of buffer solution: Accurately weigh 3.27 g of disodium hydrogen phosphate and 2.24 g of citric acid, dissolve in 200 mL of distilled water, stir to fully dissolve, and set aside; pullulanase pretreatment: accurately weigh 1 mL of pullulanase Drop into 50 mL of distilled water, stir to make it fully mixed, and set aside; prepare starch milk: weigh 15 g of waxy rice starch and add it to 100 mL of buffer solution to obtain a 10% starch emulsion; the pH range of the buffer solution is 4.6 ~4.8;

[0025] Gelatinization: bath the prepared starch milk in water at 100°C for 20 minutes to completely gelatinize the starch, and then lower the temperature to 58°C (the optimum temperature of pullulanase); enzymatic hydrolysis: add treatment For good pullulanase, hydrolyze for 6 h; centrifuge at low speed: centrifuge the obtained solution at a speed of 3000 r / min f...

Embodiment 2

[0028] Preparation of buffer solution: Accurately weigh 3.27 g of disodium hydrogen phosphate and 2.24 g of citric acid, dissolve in 200 mL of distilled water, stir to fully dissolve, and set aside; pullulanase pretreatment: accurately weigh 1 mL of pullulanase Drop into 50 mL of distilled water, stir to make it fully mixed, and set aside;

[0029] Preparation of starch milk: Weigh 20 g of waxy corn starch and add it to 100 mL of buffer solution to prepare a 10% starch emulsion; gelatinization: put the prepared starch milk in a water bath at 100 °C for 25 min to completely gelatinize the starch, then cool down to 60 ℃; enzymatic hydrolysis: add the treated pullulanase to the gelatinized colloidal solution, and enzymatically hydrolyze for 5 hours;

[0030] Low-speed centrifugation: centrifuge the obtained solution at a speed of 3000 r / min for 4 minutes while it is hot to remove long amylose; inactivate the enzyme: continue heating to raise the temperature to 100 °C and keep it ...

Embodiment 3

[0033] Preparation of buffer solution: Accurately weigh 3.27 g of disodium hydrogen phosphate and 2.24 g of citric acid, dissolve in 200 mL of distilled water, stir to fully dissolve, and set aside; pullulanase pretreatment: accurately weigh 1 mL of pullulanase Drop into 50 mL of distilled water, stir to make it fully mixed, and set aside;

[0034] Preparation of starch milk: weigh 15 g of taro starch and add it to 100 mL of buffer solution to obtain a 10% starch emulsion; gelatinization: put the prepared starch milk in a water bath at 100 °C for 20 min to completely gelatinize the starch, then cool down to 58 °C ;Enzymolysis: add the treated pullulanase to the gelatinized colloid solution, and enzymolysis for 6 h; low-speed centrifugation: centrifuge the obtained solution at 3000 r / min for 3 min while it is hot, to remove long Amylose; Enzyme inactivation: Continue heating to raise the temperature to 100°C and keep it for 10 minutes to completely inactivate the enzyme, then c...

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Abstract

The invention discloses a method for preparing water-soluble nano-silver using short amylose as a template, through raw material treatment; gelatinization; enzymolysis; low-speed centrifugation; In pure water, stir to make it fully mixed, then add silver nitrate solution to the diluted short amylose solution and mix; dissolve sodium borohydride in ultrapure water, stir to make it fully mixed, and then add dropwise to The mixed solution obtained in step 5 is mixed, placed in the dark, and freeze-dried to obtain water-soluble nano silver. The particle size of the nano-silver prepared by the invention is 2-5nm, evenly distributed, quickly soluble in water, mild in reaction conditions, safe and environmentally friendly in the preparation process, low in equipment requirements, simple in process, easy to operate, short in reaction time, high in efficiency, and suitable for large Large-scale production; the product has good performance, low preparation cost, less energy consumption, no harmful waste, and meets the production requirements of "green production, environmental protection and energy saving".

Description

technical field [0001] The invention relates to a method for preparing water-soluble nano-silver by using short amylose as a template, and belongs to the field of nanotechnology. Background technique [0002] As an emerging functional material, nano-silver is widely used in antistatic materials, catalytic materials, battery electrode materials, low-temperature superconducting materials, conductive paste materials and biosensing materials. In addition, nano-silver particles have the advantages of strong broad-spectrum bactericidal ability, good biocompatibility, and difficulty in producing drug resistance, and are more and more widely used in medical and health fields. Therefore, the preparation of nano-silver has received extensive attention. There are many methods reported in the literature. Electrochemical method, seed media method, chemical vapor deposition method, supercritical fluid method, etc. Among them, the chemical reduction method is simple to operate, low in co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 孙庆杰熊柳姬娜邱超李晓静
Owner QINGDAO AGRI UNIV
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