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Sporicidal Characteristics of Heated Dolomite Powder against Bacillus subtilis Spores

机译：加热白云石粉对枯草芽孢杆菌孢子的杀孢特性

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摘要

Dolomite is a double salt composed of calcium carbonate (CaCO3) and magnesium carbonate (MgCO3). The heat treatment of CaCO3 and MgCO3 respectively generates calcium oxide (CaO) and magnesium oxide (MgO), which have antimicrobial activity. In this study, heated dolomite powder (HDP) slurry was investigated for its sporicidal activity against Bacillus subtilis ATCC 6633 spores. The B. subtilis spores used in this study were not affected by acidic (pH 1) or alkaline (pH 13) conditions, indicating that they were highly resistant. However, dolomite powder heated to 1000 degrees C for 1 h could kill B. subtilis spores, even at pH 12.7. Sporicidal activity was only apparent when the dolomite powder was heated to 800 degrees C or higher, and sporicidal activity increased with increases in the heating temperature. This temperature corresponded to that of the generation of CaO. We determined that MgO did not contribute to the sporicidal activity of HDP. To elucidate the sporicidal mechanism of the HDP against B. subtilis spores, the generation of active oxygen from HDP slurry was examined by chemiluminescence analysis. The generation of active oxygen increased when the HDP slurry concentration rose. The results suggested that, in addition to its alkalinity, the active oxygen species generated from HDP were associated with sporicidal activity.
机译：白云石是由碳酸钙（CaCO3）和碳酸镁（MgCO3）组成的复盐。 CaCO3和MgCO3的热处理分别产生具有抗菌活性的氧化钙（CaO）和氧化镁（MgO）。在这项研究中，研究了加热的白云石粉（HDP）浆料对枯草芽孢杆菌ATCC 6633孢子的杀孢活性。本研究中使用的枯草芽孢杆菌孢子不受酸性（pH 1）或碱性（pH 13）条件的影响，表明它们具有很高的抗性。但是，即使在pH 12.7的条件下，加热到1000摄氏度1 h的白云石粉也可以杀死枯草芽孢杆菌的孢子。仅当将白云石粉末加热至800℃以上时，才具有杀孢子活性，并且随着加热温度的升高，杀孢子活性增加。该温度对应于CaO产生的温度。我们确定MgO不会促进HDP的杀孢活性。为了阐明HDP对枯草芽孢杆菌孢子的杀孢机理，通过化学发光分析检查了HDP浆液中活性氧的产生。 HDP浆液浓度升高时，活性氧的生成增加。结果表明，除碱度外，HDP产生的活性氧与杀孢活性有关。

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