Trial of a Rapid Measurement Method by Absorption Photometer for the Determination of the Number of Bacteria in the Air

  • HINOUE Mitsuo
    Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health, Japan
  • ISHIMATSU Sumiyo
    Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health, Japan
  • HORI Hajime
    Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health, Japan

Bibliographic Information

Other Title
  • 吸光光度計による気中細菌数定量のための迅速測定法の試み
  • キュウコウ コウドケイ ニ ヨル キチュウボソキンスウ テイリョウ ノ タメ ノ ジンソク ソクテイホウ ノ ココロミ

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Abstract

A quick method to measure the number and the concentration of airborne bacteria was examined by combining bacteria staining with a crystal violet solution and absorptiometry. The suspension of the bacteria isolated from the environment was adjusted to 3.0 × 108 colony forming units (CFU) / ml in E. coli equivalent, and a 10-fold dilution series was created. After centrifugation of each bacterial suspension, the supernatant was removed and the bacteria were stained by adding a crystal violet solution. The sample was centrifuged again, and the supernatant was collected and named the unabsorbed sample. The residual bacteria were washed two times, and ethanol was added to the stained cells. The recovered solution collected by centrifugation of the cells was named the recovered sample.The chemicals in the samples were examined by high performance liquid chromatography, but no peak could be observed without the staining material. Absorption spectrophotometry showed that the determination limit of bacteria in the unabsorbed samples was 3.0 × 107 CFU / ml in E. coli equivalent and that in the recovered samples was 3.0 × 108 CFU / ml, indicating that the unabsorbed sample had a lower determination limit.

Journal

  • Journal of UOEH

    Journal of UOEH 36 (2), 153-158, 2014-06-01

    The University of Occupational and Environmental Health, Japan

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