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Preparation method and application of silver nanoparticles based on citrus pectin

A technology of silver nanoparticles and pectin, applied in nanotechnology and other directions, can solve the problems of high requirements for preparation conditions and long time, and achieve the effects of simple extraction method, short reaction time, and avoiding the use of reducing agents.

Inactive Publication Date: 2018-12-18
HUNAN AGRI PRODS PROCESSING INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zhang Wenlin (2017) reported the preparation technology of pectin-based silver nanoparticles. Silver nanoparticles were successfully prepared by one-step reflux method. Although the addition of toxic substances was avoided, it needed to be heated in an oil bath at 100 °C for 5 h, and the preparation conditions were relatively strict. high and longer

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  • Preparation method and application of silver nanoparticles based on citrus pectin
  • Preparation method and application of silver nanoparticles based on citrus pectin
  • Preparation method and application of silver nanoparticles based on citrus pectin

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preparation example Construction

[0031] A kind of preparation method of silver nanoparticles based on citrus pectin of the present invention comprises the following steps:

[0032] Dissolve citrus pectin in NaOH solution under magnetic stirring to obtain citrus pectin solution, add AgNO dropwise under stirring at 60 ℃ to 90 ℃ 3 The solution reacts to obtain silver nanoparticles.

[0033] In the present invention, citrus pectin, a renewable and biodegradable biomacromolecule, is used as a reducing agent and a stabilizer, and dissolved in a sodium hydroxide (NaOH) solution in citrus pectin to obtain two parts, reduced and unreduced, wherein The unreduced part includes galacturonic acid, and the reduced part contains reducing sugars such as galactose and arabinose. These reducing sugars are added to silver nitrate (AgNO 3 ), silver nanoparticles (AgNPs) and aldehydes will be generated, and galacturonic acid is the main component of pectin. Galacturonic acid is not reducing, but it has a stabilizing effect and p...

Embodiment 1

[0043] A kind of preparation method of the silver nanoparticle based on citrus pectin of the present embodiment, comprises the following steps:

[0044] Preparation of citrus pectin:

[0045] (1) Put 200 g of Wenzhou mandarin orange peel in an oven at 60 °C and dry it, crush it with a pulverizer to below 40 mesh, boil it for 8 minutes to inactivate the enzyme, and remove the soluble matter, then rinse it with warm water until the water becomes colorless, Dry and store.

[0046] (2) Weigh 5 g of dried mandarin orange peel powder pretreated in step (1), put it in a beaker, add 100 mL of HCl solution with pH=1.0, put it in a water bath at 85 °C for 90 min, filter it with a filter cloth and wash it with water Until the filtrate is no longer viscous; centrifuge at 4000 r / min for 15 min, and take the supernatant as the pectin extract;

[0047] (3) While constantly stirring the pectin extract with a glass rod, continuously add ethanol with a volume fraction of 95%. Wash the jelly ...

Embodiment 2

[0054] This embodiment is roughly the same as Embodiment 1, the difference is:

[0055] In step (4), the alkali concentrations are 0 g / L, 0.1 g / L, 0.5 g / L, and 1.5 g / L, respectively.

[0056] The nano-silver solution after the reaction of Example 1 and Example 2 was subjected to spectral scanning at 300 nm to 600 nm. Depend on figure 1 It can be seen that when the alkali concentration is 1 g / L, the absorption peak near 410 nm is the highest.

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Abstract

The invention discloses a preparation method for silver nanoparticles based on citrus pectin. The preparation method comprises the following steps that the citrus pectin is dissolved into a NaOH solution under magnetic stirring, a citrus pectin solution is obtained, a reaction with an AgNO3 solution dropwise added under stirring at 60 DEG C-90 DEG C is made, and the silver nanoparticles are obtained. Correspondingly, the invention further provides application of the silver nanoparticles based on the citrus pectin to the bacteriostat field, and the preparation method and the application have the advantages of being environment-friendly, low in toxicity, low in cost, high in yield and the like.

Description

technical field [0001] The invention belongs to the technical field of metal nanoparticle preparation, and in particular relates to a preparation method and application of citrus pectin-based silver nanoparticles. Background technique [0002] In recent years, nanotechnology has become a research hotspot in various industries, and nanocomposites are mainly composed of polymers and metal particles. Among the numerous metal nanoparticles, silver nanoparticles (AgNPs) have been widely used in the fields of sensors, catalysts, biomedicine, water and air purification, and food preservation detection due to their diversity and broad-spectrum antibacterial activity. The traditional chemical reduction method for the preparation of AgNPs has the advantages of low cost and convenient operation, but the main drawbacks are toxic solvents, generation of harmful by-products, and high consumption. Plants, algae, fungi, bacteria, viruses, and various biopolymers have been adopted for the g...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00C08B37/06
CPCB22F9/24B82Y40/00C08B37/0048
Inventor 单杨苏东林李培骏李高阳梁金叶陶丽君
Owner HUNAN AGRI PRODS PROCESSING INST
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