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Preparation method of starch/nano-silver antibacterial composite film

A nano-silver antibacterial and composite film technology, applied in medical science, absorbent pads, bandages, etc., to achieve the effect of improving utilization, protecting the environment, and reducing defects

Inactive Publication Date: 2012-07-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of starch in the field of functional polymer materials is mainly limited to the application of starch as a filler, modifier or crosslinking agent in adhesives, modified films and modified resins, and starch is the main research material, and its application There are few reports on research and application in the field of self-assembled thin films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 10g of cornstarch in 40mL of 20% ethanol solution, and oscillate with ultrasonic waves for 3 hours, then wash and filter; dissolve the above starch in 20% dimethyl sulfoxide solution, stir for 24 hours, wash and filter, and repeat the operation Three times; the starch prepared above and the sodium hydroxide solution with a concentration of 0.3% were formulated into a mixed solution according to a mass ratio of 1:4, and stirred continuously for 3 hours, then centrifuged for 15 minutes with a centrifuge, and the upper liquid was removed and washed with water and filtered , repeat the operation three times; then dissolve the starch prepared above in a mixed solution of methanol and ether with a mass ratio of 1:1, stir for 1 hour, and centrifuge for 10 minutes with a centrifuge, remove the upper liquid, wash, filter, and repeat the operation three times , and then dried to constant weight.

[0030] will step Put the dry starch prepared in the three-necked fla...

Embodiment 2

[0034] Dissolve 10g of tapioca starch in 40mL of 20% ethanol solution, and oscillate with ultrasonic waves for 3 hours, then wash and filter; dissolve the above starch in 20% dimethyl sulfoxide solution, stir for 24 hours, wash and filter, and repeat the operation Three times; the starch prepared above and the sodium hydroxide solution with a concentration of 0.3% were formulated into a mixed solution according to a mass ratio of 1:4, and stirred continuously for 3 hours, then centrifuged for 15 minutes with a centrifuge, and the upper liquid was removed and washed with water and filtered , repeat the operation three times; then dissolve the starch prepared above in a mixed solution of methanol and ether with a mass ratio of 1:1, stir for 1 hour, and centrifuge for 10 minutes with a centrifuge, remove the upper liquid, wash, filter, and repeat the operation three times , and then dried to constant weight.

[0035] will step Put the dry starch prepared in the three-necked ...

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Abstract

The invention discloses a preparation method of a starch / nano-silver antibacterial composite film, belonging to the field of functional high molecular material science. In the composite film, starch is taken as a major raw material; by degrading and oxidizing the starch, the molecular weight of the starch is reduced, an active functional group of the starch is modified, and a low-molecular-weightstarch solution containing a reduced group is prepared; the starch film is prepared in the solution in a self-assembly way; and the starch / nano-silver antibacterial composite film is prepared by soaking the starch self-assembly film into a silver ammonia solution according to a silver mirror reacting principle. The composite film has high biocompatibility and antisepsis and sterilization properties, and is environmentally-friendly; starch is taken as a major raw material of the composite film, so that the source is rich, the price is low, and the composite film has a wide application prospecton the aspect of medical antibacterial materials; and meanwhile, a preparation process of the composite film is simple, and has low equipment requirements.

Description

technical field [0001] The invention relates to the scientific field of functional polymer materials, in particular to a preparation method of a starch / nano-silver antibacterial composite film. Background technique [0002] Starch mainly comes from the seeds, roots, stems and fruits of plants, and is a general form of energy storage in plants. Starch is a natural polymer compound, its basic structural unit is glucose, and a starch granule is composed of tens of thousands of glucose units linked by glycosidic bonds. It is precisely because of the characteristics of the molecular structure of starch that it has played an important role in human life and production since ancient times. my country's starch resources are abundant, widely sourced, and low in price. Due to its good viscosity, film-forming properties, biocompatibility, degradability, environmental protection, and renewable properties, starch has become a functional polymer material in recent years. Research hotspot...

Claims

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Application Information

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IPC IPC(8): A61L15/28A61L15/44C08B31/18C03C17/36C04B41/50
Inventor 李立东夏碧华马宁唐馥崔倩玲
Owner UNIV OF SCI & TECH BEIJING
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