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Preparation And Antibacterial Effect Of Silver Nano-inorganic Antibacterial Materials Detection

Posted on:2006-11-23Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y GaoFull Text:PDF
GTID:2191360155965105Subject:Biochemical Engineering
Abstract/Summary:PDF Full Text Request
Antiseptic products are developing quickly as people have higher health requirements. After the SARS epidemic and birds flu in early this century, production of antibiotic products has come to be a new industry with practical meaning.This article first introduces study of antiseptic products, then states the types and mechanism of antiseptics. Property and production of silver nanometer inorganic antiseptics are also discussed. Discussion of the future applications of silver antiseptics is made in the end.Production test is described in the article, Trial tests are made to find effects to silver amount by temperature drop, reaction temperature, and time being soaked. Through these tests, 1h soakage, reaction under 350°C and isolating oxygen when temperature drops is concluded the best condition for producing silver diatomite. This condition is also applicable for producing of silver molecular sieve. While 0.5h soakage, reaction under 350℃ and isolating oxygen when temperature drops is concluded the best condition for producing silver zeolite, lh soakage, reaction under 300°C is the best for producing silver active carbon. In these four products, active carbon carries the most of silver, diatomite and molecular sieve rank the second with 3.5% of silver and zeolite ranks the last with about 2% silver.Escherichia coli and Staphylococcus aureus are adopted in the tests. The antiseptic property is checked with methods of inhibition zone, dilution and immersion. After the tests, these products are proved to have good antiseptic property and also have long time effects.The inhibition zone test proves that these silver materials have obvious inhibiting effects on Escherichia coli and Staphylococcus aureus.In the dilution test, the minimum inhibition density of silver diatomite and molecular sieve to Escherichia coli are 50μg/g, 100μg/g to Staphylococcus aureus. That of silver zeolite to Escherichia coli and Staphylococcus aureus is 50μg/g, that of silver active carbon toEscherichia coli and Staphylococcus aureus is 100Hg/g.In the test to find sterilizing rate, rates of silver diatomite, silver molecular sieve and zeolite to Escherichia coli are all 99.8%. rate of active carbon to Escherichia coli is 91.2%. Rates of silver diatomite, molecular sieve, zeolite and active carbon to Staphylococcus aureus are 92.3%, 91.2%, 93. 5% and 86. 1% respectively.In the end of this article, the applications of these silver products are discussed. All the silver products have good killing effects on microbes on leather.
Keywords/Search Tags:silver diatomite, silver molecular sieve, silver zeolite, silver active carbon, antiseptic property
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