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Preparation method of carboxymethyl curdlan polysaccharide-based colloidal aqueous solution containing nano silver particles

A technology of carboxymethyl cod gum polysaccharide and carboxymethyl cod gum, which is applied in the field of biomedicine, can solve the problems of toxicity and environmental pollution, and achieve easy manipulation, simple and easy preparation process, and avoid uneven heating Effect

Inactive Publication Date: 2011-09-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its commonly used reducing agents such as hydrazine hydrate, sodium borohydride, formaldehyde, dimethylformamide, etc. are toxic and cause great environmental pollution.

Method used

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  • Preparation method of carboxymethyl curdlan polysaccharide-based colloidal aqueous solution containing nano silver particles
  • Preparation method of carboxymethyl curdlan polysaccharide-based colloidal aqueous solution containing nano silver particles
  • Preparation method of carboxymethyl curdlan polysaccharide-based colloidal aqueous solution containing nano silver particles

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Effect test

Embodiment 1

[0023] Dissolve 0.43g of silver nitrate in deionized water, settle to a 50mL brown volumetric flask, and prepare a concentration of 0.05mol / L silver nitrate aqueous solution; 0.02g of carboxymethyl cod gum (M w ≈800,000) was dissolved in 20mL deionized water to prepare a carboxymethyl cod gum aqueous solution with a concentration of 0.1g / mL; mix 0.2mL silver nitrate aqueous solution with 0.5mL carboxymethyl cod gum aqueous solution, and then add deionized water to make The total volume of the solution is 5mL, the concentration of silver nitrate is 0.002mol / L, the concentration of carboxymethyl cod gum is 0.01g / mL, the pH range is controlled to be 6-8, and the mixture is evenly mixed in a dark place at room temperature and protected from light. Then the solution is placed in a wavelength of 365nm ultraviolet light for 24h to obtain a yellow nano-silver colloidal aqueous solution, and the results of the transmission electron microscope are as attached figure 1 As shown, the aver...

Embodiment 2

[0025] Dissolve 0.43g silver nitrate in deionized water, and settle to a 50mL brown volumetric flask to prepare a 0.05mol / L silver nitrate aqueous solution; 0.02g carboxymethyl cod gum (M w≈800,000) was dissolved in 20mL deionized water to prepare a carboxymethyl cod gum aqueous solution with a concentration of 0.1g / mL; mix 0.2mL silver nitrate aqueous solution with 0.5mL carboxymethyl cod gum aqueous solution, and then add deionized water to make The total volume of the solution is 5mL, the concentration of silver nitrate is 0.002mol / L, the concentration of carboxymethyl cod gum is 0.01g / mL, the pH range is controlled to be 6-8, and the mixture is evenly mixed in a dark place at room temperature and protected from light. Then the solution is placed in a wavelength of 365nm ultraviolet light for 1h to obtain a light pink nano-silver colloidal aqueous solution, and the transmission electron microscope results are as attached image 3 As shown, the obtained nano-silver particles...

Embodiment 3

[0027] Dissolve 0.43g of silver nitrate in deionized water, settle to a 50mL brown volumetric flask, and prepare a concentration of 0.05mol / L silver nitrate aqueous solution; 0.02g of carboxymethyl cod gum (M w ≈800,000) was dissolved in 20mL deionized water to prepare a carboxymethyl cod gum aqueous solution with a concentration of 0.1g / mL; mix 0.2mL silver nitrate aqueous solution with 0.5mL carboxymethyl cod gum aqueous solution, and then add deionized water to make The total volume of the solution is 5mL, the concentration of silver nitrate is 0.002mol / L, the concentration of carboxymethyl cod gum is 0.01g / mL, the pH range is controlled to be 6-8, and the mixture is evenly mixed in a dark place at room temperature and protected from light. The solution is then placed in a wavelength of 365nm ultraviolet light for 7 hours to obtain a light yellow nano-silver colloidal aqueous solution. The particle size distribution of the prepared nano-silver particles is narrower than that...

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Abstract

The invention discloses a preparation method of carboxymethyl curdlan polysaccharide-based colloidal aqueous solution containing nano silver particles in the technical field of biomedicine. The method is implemented by the following technical scheme that: the method comprises the following steps of: mixing aqueous solution of silver nitrate and aqueous solution of carboxymethyl curdlan, wherein the concentration of the silver nitrate is 0.001 to 0.01mol / L, and the concentration of the carboxymethyl curdlan is 0.001 to 0.1g / mL; and performing ultraviolet irradiation to obtain nano silver-containing colloidal aqueous solution with different particle diameter and particle diameter distribution. The process of the method is simple; the raw materials involved in the reaction are environment-friendly and pollution-free, have biocompatibility, and do not need post treatment; and by changing the concentration of the silver nitrate, the concentration of the carboxymethyl curdlan, the molecularweight and the illumination time, the particle diameter and the particle diameter distribution of the nano silver particles are adjusted and controlled, namely the size is adjustable.

Description

technical field [0001] The invention relates to a material and a preparation method in the technical field of biomedicine, in particular to a preparation method of a colloidal aqueous solution containing nano-silver particles based on carboxymethyl cod gum polysaccharide. Background technique [0002] Metallic silver has anti-bacteria and broad-spectrum anti-bacteria, and has obvious bactericidal function against bacteria such as Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus. The quantum tunneling effect also shows excellent optical, electrical, thermal, magnetic and chemical properties, so it has a wide range of applications in catalysis, optoelectronic devices, surface-enhanced Raman scattering (SERS), biosensors, biomedicine, etc. . [0003] At present, the preparation methods of nano-silver at home and abroad mainly include chemical methods and physical methods. Chemical methods include liquid-phase chemical reduction method, photochemical reducti...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 邬娟张洪斌
Owner SHANGHAI JIAO TONG UNIV
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