Acidic Electrolyzed Water Research Articles

電解水による歯科用器具の消毒とその腐食傾向

The excellent bactericidal activity of the electrolyzed acid water has recently been noticed in dentistry. The authors previously demonstrated the validity of the strong acid water as a disinfectant for impression showing rapid and reliable sterilization effect. In the present study, the applicability of the electrolyzed water to sterilization of dental metallic instruments was examined. The contamination bacteria tested were Streptococcus salivarius (IFO 13956). As the problem with the acid water is that it is potentially corrosive to metals, corrosion tests were also carried out. The instruments having simple configuration such as reamer and explorer could be sterilized by one-minute immersion in the strong acid water, while those of comlicated configuration such as diamond stones and burs required much longer time for equivalent sterilization. When the ultrasonic cleaning action was added in the strong acid water, all the instruments were sufficiently sterilized by one-minute treatment although such a cleaning itself could give little effect of removing bacteria from the instruments even by 20-minute treatment in distilled water. Another type of electrolized water, the week acid water 5.2 in pH showed almost the same effects as the strong acid water. The reamer and diamond stone showed no corrosion in 24-hour immersion in the acid water. The working end of the explorer was also sound while many corrosion pits were observed on its handle. A marked corrosion was found on the overall surface of the steel burs, and a localized loss occurred at the brazed area between the blade and shank of the carbide burs without the blade being harmed. It was confirmed that the week acid water was less corrosive than the strong. Significant damages of the burs by corrosion appeared after 3-hour immersion in the acid water. The term corresponds to 180-time repetitions of one-minute immersion treatment, indicating that such a corrosion behavior may not result in any practically serious problem because it may far exceed the mechanical lives in service of their blades. These findings suggest that both the electrolyzed strong and week acid waters may well be available as the disinfectant for dental instruments.

電解水の義歯洗浄効果 細菌学的検討

The purpose of this study was to investigate efficacies of acidic and neutral electrolyzed water as denture cleansers from the bacteriological aspect.Twenty-five upper full dentures of patients of an elderly care center were used in this study. Nine dentures were immersed in acidic electrolyzed water, eight in neutral electrolyzed water and eight in denture cleanser (Pika®). Plaque samples were collected from fitting surface of the dentures by scrubbing before and after immersion, and the changes in the number of bacteria were observed.The results were as follows:1. Acidic and neutral electrolyzed water were effective as denture cleansers, and the rates of removal [log10 (bacteria number after immersion)/logic, (before immersion)] tended to be constant.2. MRSA decreased by immersion in acidic electrolyzed water and in denture cleanser (MRSA was isolated from four dentures. Two were immersed in acidic electrolyzed water and two in denture cleanser).

電解酸性水による印象の殺菌

電解酸性水による印象の殺菌

Bactericidal Activity of Electrolyzed Acid Water for Alginate Impression

Bactericidal Activity of Electrolyzed Acid Water for Alginate Impression

Is It Possible for the Electrolyzed Acid Water to be Applied to the Dental Region ?

Is It Possible for the Electrolyzed Acid Water to be Applied to the Dental Region ?

2202. Spotting the culprit in plastics sterilized with ethylene oxide: Brown, D.J. (1970). Determination of ethylene oxide and ethylene chlorohydrin in plastic and rubber surgical equipment sterilized with ethylene oxide. J. Ass. off. analyt. Chem.53, 263.

Brown rice is prone to be contaminated by microorganism and it is a common problem during brown rice soaking and germination. In this study, efficacy of acidic electrolyzed water (AEW) and slightly acidic electrolyzed water (SAEW) with different available chorine concentrations (ACC) on inactivation of natural microbiota and inoculated Bacillus cereus spores on brown rice was determined. Effect of replacing treatment solution during soaking and properties of brown rice after treatment was also determined. Brown rice was treated with AEW and SAEW at ACC of 50, 100 and 150 mg/L for 30 or 60 min at the ratio of 1: 5 (w/v) to remove the natural microbiota and then soaked in sterilized deionized water for the following 24 h. The results showed AEW with ACC of 150 mg/L for 30 or 60 min treatment decontaminated natural microbiota completely with no significant impact on properties of brown rice and could be used to remove microbiota on brown rice for the following inoculation trials. AEW and SAEW with ACC of 50, 100 and 150 mg/L were used to soak brown rice for 24 h and achieved the reduction of B. cereus spores inoculated on brown rice about 1.6–3.3 logs. AEW and SAEW with ACC of 50 and 100 mg/L replaced for 5 times during brown rice soaking achieved additional 2.40, 2.87 and 2.80, 2.78 log reductions respectively, in comparison with electrolyzed oxidizing (EO) waters with the same ACC soaked brown rice without replacement. However, germination potential and germination rate of brown rice were negatively affected by AEW for 24 h soaking. Results suggested that the application of SAEW to soak brown rice could reduce the microorganism with no adverse effect or even promote the properties of brown rice and hence could be used safely in food industry for brown rice soaking. Other approaches will be needed to combine with EO water for brown rice germination to reduce microbiota.