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Colloidal silver is dispersed in an matrix incl. a hydrolysable silane.
Bactericidal coatings for medical devices formed by atmospheric plasma processing
Atmospheric plasma chemical vapour deposition (APCVD) is used to create bactericidal surfaces in medical applications. Sketch shows apparatus. Coatings must be tested in particular for very low extraction rates of coating components when immersed in biological fluids or tissue. Procedure for this is described as are tests for bactericidal properties. SEMs show typical surfaces created by the process. Silver is widely used bactericidal agent. Histogram shows rates of silver release over 24 hours. Cytotoxic and bactericidal behaviour is discussed. Histograms show results of test measurements, citing German Standards used in testing. APCVD’s claim to be a cost-effective method for forming coatings on a wide range of substrates including textiles and the bactericidal action when challenged by a wide range of microorganisms is described. 32 refs
Bactericidal composition and method for its preparing.
Bactericidal composition comprising active substance based on ionized silver prepared by electrolysis and amino acid, and ammonium nitrogen and ammonium ions also in the following ratio of components, wt.-%: ionized silver, 0.01-0.4; amino acid, 0.1-4.0; ammonium nitrogen and ammonium ions, 0.0015-0.045, and distilled water, the balance. The bactericidal composition comprises amino acid being preferably glycine. Method for preparing the ionized silver-base bactericidal composition by electrolysis shows that electrolysis solution contains amino acid, preferably glycine, and ammonia in the following ratio of components, wt.-%: amino acid, preferably glycine, 0.1-5.0; ammonia, 0.002-0,055, and distilled water, the balance. Electrolysis is carried out by using two silver electrodes switched to the direct current source and in change polarity of electrodes in each 5-600 s, current power between electrodes 0.05-0.5 A and voltage 0.5-20 V. Invention provides preparing the highly effective bactericidal composition. ^ EFFECT: improved preparing method.
To obtain a biocidal composition exhibiting antimicrobial activity at low concentration by dispersing an antimicrobial agent containing a sparingly soluble silver compound deposited on a synthetic oxide support such as titania into a surfactant such as DOSS. SOLUTION: This biocidal composition contains a sparingly soluble silver compound deposited on a synthetic oxide (e.g. titania) support (e.g. silver chloride in an amount of 1-75 wt.% based on the support) and the effective component is dispersed in an amount of 5-1,000 ppm, especially 10-50 ppm based on total weight of the composition. The composition exhibits excellent activity as a biocidal component and/or a preservative component even in a considerably low concentration and among various kinds of materials. The composition is used as leave- on or rinse-off cosmetic. The composition may be a water-base polymer or a plastic or a polymer composition or further, a concentrated biocidal composition composed of 1-15 wt.% biocidal component, 1-5 wt.% DOSS solution and balance of water.
A bactericidal composition that is obtained by adding sodium laurylsulfate as a surface active agent to a silver salt of sulfa drug, thus markedly increasing the bactericidal effect of the sulfa drug which has been used as a bactericidal or bacteriostatic agent. The objective composition is obtained by adding sodium laurylsulfate to a silver salt of sulfa drugs such as compounds of given formula. The amount of the sodium laurylsulfate is 0.01-1% based on the composition and 6.5-20,000 at a weight ratio. When the drug is not heat-treated, the addition of more than 0.01% of sodium laurylsulfate increases the bactericidal effect 8- 250 times.
Bactericidal detergent composition.
Bactericidal detergent composition, including: (a) 5-30 wt. % of a nonionic surfactant including alkyl glucoside; (b) 1-10 wt% of a nonionic surfactant including any one selected from among fatty acid alkanol amide, alkyl ethoxylate, and amine oxide; (c) 1-10 wt. % of a nonionic surfactant including sucrose fatty acid ester; and (d) 10-100 ppm of nano-silver having a size of 3-20 nm, which is advantageous because it is highly biodegradable and harmless to human beings, and also, exhibits high bactericidal and germicidal activity due to nano-silver while having high stability in spite of using nano-silver.
Ceramic enamel incl. rare earth oxide (ceria) along with Si, Al, Ca oxides, etc., and permits existence of electronic transfers capable of affecting redox process of live matter that are converted into bactericidal capacity.
Bactericidal fiber and bactericidal filter.
To provide bactericidal fiber and filter having high and durable bactericidal effect by supporting silver ion on a specific crosslinked acryllc fiber. A crosslinked acrylic fiber having a nitrogen content increased by 1.0-8.0wt.% by the crosslinking treatment with an aqueous solution of hydrazine sulfate or hydrazine hydrochloride is treated with an alkali, 0.3-4.5mmol/g of carboxyl group is introduced into a part of the non-crosslinked residual nitrile group and amide group is introduced into the remaining nitrile group. The product is treated with an aqueous solution of silver nitrate to obtain a bactericidal fiber containing 0.1-30wt.% of silver ion and having excellent durability resistant to the peeling and falling-off of the silver ion. A bactericidal filter for water having filtering performance and bactericidal performance and easily enabling the filtration and disinfection of the bath water of home, public bathhouse, etc., or pool water can be produced by using the fiber as the filtering material.
Bactericidal fiber material and method for producing the same.
Bactericidal fiber material which exhibits an excellent bactericidal power without deteriorating over a long period. This bactericidal fiber material comprises silver colloid-carrying hydrophilic organic fibers formed in the presence of a cationic surfactant. The method for producing the bactericidal fiber material is characterized by contacting hydrophilic organic fibers with a water-soluble silver compound in the presence of a cationic surfactant in an aqueous medium and then reducing the product with a composite metal hydride to produce the silver colloid and simultaneously bind the silver colloid to the hydrophilic organic fibers.
Bactericidal filtering device and production of bactericidal filter bed used therefor.
To be porous the Ag carried on a resin filter, to be easily chlorinated and to make it favorable as a bactericidal filter bed by carrying silver chloride on the filter bed consisting of a porous ceramic plate or the resin filter, etc., or a filter material consisting of ceramic particles, etc. Warm water being flowed in from a raw water inflow pipe is eliminated large dusts, etc., with a flow straightening plate consisting of the porous ceramic plate to simultaneously distribute the raw water on the filter material consisting of ceramic particles or glass carried with silver chloride distributed on the bed without carrying silver chloride, to almost uniformly supply the water to eliminate small dusts and scales, etc., and simultaneously to sterilize the water. The purified warm water is cycled from a purification discharge pipe to a water bath. When the filter bed is made from the resin filter or the porous ceramic plate carried with silver chloride, even though the particles such as ceramic particles of glass beads, not carrying silver chloride are used for the filter material, the water is sterilized and purified as well. The silver carried on the resin filter is porous and it is easily chlorinated and it becomes suitable as a bactericidal filter bed.
Bactericidal glass and its production.
To offer a bactericidal glass which can maintain the bactericidal performance for a long period, and to offer the production method. Glass is dipped in a solvent for ion exchange and heat treated so that sodium ion in the glass is exchanged with metal ion such as silver ion, copper ion, etc., having a bactericidal effect. To make an uneven distribution of the metal ion deposited o the glass so that many ions are present on the glass surface, the heat treatment near the glass transition point is performed in a short period. Thereby, this method can solve such problems concerning to environmental contamination and health such as influences on a human body due to the metal ion released from the glass.
Bactericidal glaze and bactericidal ceramic.
Bactericidal glass and ceramic is compounded with glaze material 96-98%, calcium salt 1.5-2.5% and silver nitrate or sulfate 0.5-1.5%. It has special effect of killing bacteria and bacteriostasis in certain light and heat condition and thus can reduce greatly people's work in cleaning ceramic utensils. Unlike common ceramic, the bactericidal ceramic can produce bactericidal efficiency of 39.25% at 25°C in 30 min and 57.98% at 56°C in 30 min and has no side effect on body.
Bactericidal material and bactericidal method.
To provide a bactericidal material having excellent chemical resistance and heat resistance and enabling sustained release of small amount of silver ion, a composite bactericidal material having high bactericidal efficiency per unit time even at a low supported silver concentration and a technique for recycling the composite bactericidal material. SOLUTION: This bactericidal material contains a compound of general formula I (Ag2O)a(A2O)b(BO)c(C2O3)d(SiO2)e (DO2)f(E2O5)g [I] [A is one or more substances selected from alkali metal, copper, hydrogen and ammonium; B is one or more elements selected from iron, copper, zinc, alkaline earth metal, Ni, Mn, Co, Cd, Hg and Au; C is one or more elements selected from iron, Al, Mn, B, Co, Cr, V, Sc, Y, La, Ga, In, Sb and Bi; D is one or more element selected from Ce, Mn, C, Hf and Os; and E is one or more elements selected from P, Sb, V, Nb and Ta] as an active component.
Bactericidal mechanism of silver/aluminium oxide against Escherichia coli.
Escherichia coli cells became severely disrupted by contact with the prepared silver;aluminium oxide bactericide. In contrast, little change in the cells resulted from treatment with aqueous silver ions. Furthermore, prior treatment of the binary biocide with superoxide dismutase and/or catalase, which respectively deactivate superoxide anion radicals and hydrogen peroxide, weakened the bactericidal efficacy of the modified aluminium oxide. Hence, it was concluded that the bactericide acted by a catalysed oxidation of the bacterial cells. Ultraviolet irradiation weakened this, whilst blackening the initially white bactericide. This indicated that silver oxide was beneficial for the bactericidal activity. Synergy of the two components in the cell disruption was also identified.
Bactericidal membrane for water purifier and method of making the same.
Coated products. A bactericidal membrane for a water purifier comprises a porous sheet of a water-insoluble non-woven cloth having coatings of a silver halide formed such that the surface of each fibre of the cloth in a surface layer on each side of the sheet is covered with the halide. The product may be obtained by immersing the sheet in an aqueous solution of a water-soluble silver salt, immersing the sheet further in an aqueous solution of a halide to convert the silver salt into the silver halide, washing the coated and impregnated sheet and drying. Alternatively the coatings may be formed by immersing the sheet in aqueous ammonia containing silver chloride as the ammine complex and drying. The preferred halide is the chloride. The substrate may be a canvas, non-woven cloth, asbestos cloth, glass fibre cloth and Japanese paper. A preferred non-woven cloth is formed from a synthetic fibre such as nylon, rayon, acetate, polyethylene terephthalate or other polyester, polypropylene, partially acetal formed polyvinyl alcohol and mixtures of these.