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Proposal of a simplified technique for staining bacterial spores without applying heat--successful modification of
1Department of Biomedical Laboratory Sciences, School of Health Sciences, Shinshu University School of Medicine, Matsumoto 390-8621, Japan.
Background And Aims:
As the bacterial spores are difficult to stain, a number of staining techniques including their modifications have been proposed to date. Most of the conventional staining procedures unexceptionally contain the step of staining with steamed dye reagent in order to increase the stainability of the spores. We made an attempt to improve the conventional Moeller's methods for staining bacterial spores.
Methods:
Spores of Bacillus species were stained with our modified Moeller's spore stain and evaluated for its staining properties. We investigated the stainability of both of the conventional and the modified Moeller's methods and the evaluation was made whether or not the step of steaming of Kinyoun's carbol-fuchsine dye reagent could be omitted by adding to aliquots of Tergitol 7, in place of the conventional dye solution steamed for some interval over hot blue flame of a Bunsen burner.
Results:
We successfully omitted the heating step of steaming the Kinyoun's carbol fuchsine dye solution in the Moeller's method of bacterial spore stain, by the replacement of Kinyoun's carbol-fuchsine dye solution involving 2 drops of Tergitol 7, nonionic polyglycol ether surfactants type NP-7 (Sigma-Aldrich Japan, Tokyo, Japan) per 10 ml of Kinyoun's carbol-fuchsine dye solution. Bacillus spores stained pink to red and vegetative bacterial cells stained blue, although without applying any heating step during the whole course of staining processes including the fixation process. The novel staining method of our proposal resulted in far better satisfactory stainability in comparison with the conventional Moeller's method with the steaming dye solution.
Conclusions:
The modified spore stain without applying any heating step using the Kinyoun's carbol-fuchsine dye solution with an addition of Tergitol 7 aliquots was demonstrated to be reproducible and yielded consistent and satisfactory stainability. This simplified staining procedure is rapid to perform and found to be applicable to detect the bacterial spores in routine clinical microbiology laboratories.
Insights
A modified Moeller's spore stain omits the heating step, using Kinyoun's carbol-fuchsine dye with Tergitol 7. This method provides improved bacterial spore stainability and is suitable for routine clinical microbiology.
Area of Science:
- Microbiology
- Bacteriology
Background:
- Bacterial spores are notoriously difficult to stain.
- Conventional staining methods often require a heating step with steamed dye reagents to enhance spore stainability.
- Existing techniques, including Moeller's method, have limitations in ease of use and effectiveness.
Purpose of the Study:
- To improve the conventional Moeller's method for bacterial spore staining.
- To investigate the feasibility of omitting the heating step in bacterial spore staining procedures.
- To develop a simplified and effective method for visualizing bacterial spores.
Main Methods:
- Modified Moeller's spore stain utilizing Kinyoun's carbol-fuchsine dye with the addition of Tergitol 7.
- Evaluation of staining properties of the modified method compared to conventional Moeller's method.
- Investigation into omitting the steaming step of the dye reagent.
Main Results:
- The heating step for steaming Kinyoun's carbol-fuchsine dye was successfully omitted by adding Tergitol 7.
- Bacillus spores stained pink to red, and vegetative cells stained blue without any heating.
- The modified method demonstrated superior stainability compared to the conventional Moeller's method.
Conclusions:
- A reproducible modified spore stain, omitting the heating step and using Kinyoun's carbol-fuchsine with Tergitol 7, yields satisfactory results.
- This simplified staining procedure is rapid and applicable for routine detection of bacterial spores in clinical microbiology.
- The novel method offers a practical alternative for enhanced bacterial spore visualization.
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