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A green rapid preparation method of antibacterial material sodium alginate-ascorbic acid nano silver

A technology of sodium alginate and ascorbic acid, which is applied in the field of fresh-keeping, can solve the problems of toxicity and difficulty in dispersing, and achieve the effect of reducing potential toxicity, reducing toxicity, and avoiding environmental pressure

Active Publication Date: 2019-09-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, highly reactive reducing agents, such as hydrazine, N,N-dimethylformamide, etc., will cause potential toxicity to the environment and organisms; commonly used stabilizers, such as triphenylphosphine, polyvinylpyrrolidone, etc. , the problem of difficult dispersion cannot be ignored
In addition, toxic substances produced during chemical synthesis can also cause environmental pressure

Method used

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  • A green rapid preparation method of antibacterial material sodium alginate-ascorbic acid nano silver
  • A green rapid preparation method of antibacterial material sodium alginate-ascorbic acid nano silver
  • A green rapid preparation method of antibacterial material sodium alginate-ascorbic acid nano silver

Examples

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Effect test

Embodiment 1

[0026] Example 1: Prepare 10mL, 15mg / mL sodium alginate aqueous solution (pH12), heat the sodium alginate aqueous solution with magnetic stirring overnight, the heating temperature is 45°C, and the magnetic stirring speed is 1000r / min, add the sodium alginate aqueous solution gradually Add 0.4 mL of silver nitrate (AgNO 3 , 50mmol / L) solution, accompanied by vortex treatment, dropwise added 0.2mL of ascorbic acid (Vc, 10mg / L) solution to the above mixture, accompanied by vortex treatment, ultrasonic treatment of the mixed system, ultrasonic conditions: 300W, 30 ℃, 1h, after the preparation is completed, keep away from light, and the nano-silver solution is used for ultraviolet-visible (UV-Vis) spectroscopic spectroscopy and antibacterial performance determination. The sodium alginate nano-silver solution is centrifuged at 5000rpm for 10min, and the supernatant is discarded. Repeated washing with distilled water 3 times, the precipitate was placed in a refrigerator at -80°C for...

Embodiment 2

[0032] Example 2: Prepare 10mL, 15mg / mL sodium alginate aqueous solution (pH6), heat the sodium alginate aqueous solution with magnetic stirring overnight, the heating temperature is 40°C, and the magnetic stirring speed is 1000r / min, add the sodium alginate aqueous solution gradually Add 0.4 mL of silver nitrate (AgNO 3 , 40mmol / L) solution, accompanied by vortex treatment, dropwise 0.2mL of ascorbic acid (Vc, 10mg / L) solution into the above mixture, accompanied by vortex treatment, ultrasonic treatment of the mixed system, ultrasonic conditions: 100W, 15 ℃, 0.5h, after the preparation is completed, store away from light, the nano-silver solution is used for ultraviolet-visible (UV-Vis) spectroscopic spectrum and antibacterial performance measurement, centrifuge the sodium alginate nano-silver solution at 5000-10000rpm for 10min, discard the upper The supernatant was repeatedly washed with distilled water for 3-5 times, the precipitate was placed in a -80°C refrigerator for 1...

Embodiment 3

[0033] Example 3: prepare 10mL, 15mg / mL sodium alginate aqueous solution (pH13), heat the sodium alginate aqueous solution with magnetic stirring overnight, the heating temperature is 45°C, and the magnetic stirring speed is 600r / min, add the sodium alginate aqueous solution gradually Add 0.4 mL of silver nitrate (AgNO 3 , 60mmol / L) solution, accompanied by vortex treatment, dropwise added 1.0mL of ascorbic acid (Vc, 10mg / L) solution to the above mixture, accompanied by vortex treatment, ultrasonic treatment of the mixed system, ultrasonic conditions: 100W, 30 ℃, 0.5h, after the preparation is completed, store away from light, the nano-silver solution is used for ultraviolet-visible (UV-Vis) spectroscopic spectrum and antibacterial performance measurement, centrifuge the sodium alginate nano-silver solution at 5000-10000rpm for 10min, discard the upper The supernatant was repeatedly washed with distilled water for 3-5 times, the precipitate was placed in a -80°C refrigerator f...

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Abstract

The invention discloses a green and quick preparation method of antibacterial material sodium alginate-ascorbic acid nano-silver. The method includes the following steps that (1) a sodium alginate water solution is prepared; (2) the sodium alginate water solution is heated and magnetically stirred overnight; (3) a silver nitrate solution is dropwise added into the overnight stirred sodium alginatewater solution in accompaniment with vortex treatment; (4) an ascorbic acid solution is dropwise added into the mixture obtained in the step (3) in accompaniment with vortex treatment; (5) ultrasonictreatment is carried out on a mixing system; and (6) the mixing system obtained after ultrasonic treatment is centrifuged, supernate is discarded, washing is carried out, sediment is refrigerated ina refrigerator at the temperature of minus 80 DEG C and subjected to freeze drying through a vacuum freezer dryer at the temperature of minus 40 DEG C, and sodium alginate nano-silver particles are obtained. According to the method, the sodium alginate-ascorbic acid nano-silver material is prepared through ultrasound, quick and green preparation is achieved, and the sodium alginate-ascorbic acid nano-silver material is a fresh-keeping packaging material with high potential and is used for prolonging the practical shelf life of products to be packaged.

Description

technical field [0001] The invention relates to the field of fresh-keeping, in particular to a green rapid preparation method of an antibacterial material sodium alginate-ascorbic acid nano-silver. Background technique [0002] Due to their excellent biocompatibility, new metal nanomaterials have attracted increasing attention. As a new material, nano-silver is considered to be the most commonly used metal nano-material, which is mainly due to its unique physical and chemical properties and antibacterial properties, so it is widely used in biomedicine, pharmaceuticals and food packaging and other fields. The antibacterial performance of nano-silver is closely related to its large surface space, thermal stability and release of silver ions, which all depend on the type, size and shape of silver. In addition, the synthesis method of nano-silver is also critical. Compared with metal salts and simple metals, nano-silver can realize the controllable release of silver ions, so as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24A01N59/16A01P1/00B82Y40/00
Inventor 刘东红胡亚芹陈士国丁甜叶兴乾陈健初邵颖
Owner ZHEJIANG UNIV
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