Bacterial Attachment on Magnesium Alloy AZ31B with a Note on its Antibacterial Property(Materials, Metallurgy & Weldability)
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概要
- 論文の詳細を見る
Magnesium (Mg) alloys attract the focus of leading industries such as telecom, computer etc, and medical and household appliances due to their strength and weightlessness. However, magnesium is one of the major cell components of bacteria, which predisposes it to microbial attachment and growth. To understand its vulnerability to bacterial attachment that leads to microbiologically influenced corrosion (MIC), laboratory exposure studies using a magnesium alloy AZ31 B were carried out with a biofilm forming bacteria Pseudomonas sp. A high rate of bacterial attachment (calculated using image processing software) viz. 14.33±6.72% and 33.69±10.25%, was observed for one and two days of exposure, respectively. However, the area of bacterial adhesion reduced to 2.71±1.36% by the sixth day. The total viable count (TVC) on the surface of the experimental coupons also showed the maximum value on the first day, and reduced to a very low number by the sixth day. Mg ion concentration in the experimental medium showed a gradual increase over the time period. This was true with the control as well. The maximum concentrations were 25.5 and 23.5mg/ml for control and experimental samples respectively by the sixth day. Consequently, the medium pH also increased to 9.7 and 9.8 in the control and experimental media respectively. The coupon surface pH also rose to more than 11 by the third day. Magnesium reacts with water producing magnesium hydroxide, which forms a protective film over the coupon surface in addition to the dissolution into the medium. The formation of such a film and the dissolution of Mg elevated the pH of the coupon surface and the medium to the alkaline range. The combined effect of high pH and high concentration of magnesium ion adversely affected the growth and survival of Pseudomonas sp. both in the medium and on the coupon surface resulting in a modest attachment and very low TVC by the sixth day. Thus, Magnesium alloys exhibited antibacterial property that prevented bacterial attachment and formation of biofilm.
- 大阪大学の論文
著者
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KIKUCHI Yasushi
Osaka University
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Kurissery Sreekumari
Osaka University
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Kanavillil Nandakumar
Marine Resources And Environment Research Institute Aist
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