Cellular fatty acid composition in staphylococci isolated from bovine milk

Area of Science:

• Microbiology
• Bacteriology
• Lipidomics

Background:

• Coagulase-negative staphylococci (CoNS) are significant in bovine mastitis.
• Accurate identification of staphylococcal species is crucial for epidemiological studies and control strategies.
• Cellular fatty acid profiles offer a potential method for bacterial classification.

Purpose of the Study:

• To analyze the cellular fatty acid composition of coagulase-negative staphylococci from bovine milk.
• To compare fatty acid profiles between different staphylococcal species, including Staphylococcus aureus.
• To evaluate the utility of fatty acid composition in classifying staphylococcal strains.

Main Methods:

• Gas chromatography was used to determine the fatty acid composition of 61 CoNS strains and 19 reference strains (S. aureus, S. epidermidis).
• Strains were classified into nine species based on Kloos & Schleifer criteria.
• Analysis of variance and similarity calculations were performed on the fatty acid data.

Main Results:

• The primary fatty acids across all staphylococcal strains were iso-C15:0, anteiso-C15:0, C18:0, and C20:0.
• While overall differences were minor, S. capitis, S. cohnii, S. epidermidis, and S. xylosus showed slightly distinct fatty acid profiles.
• Similarity analysis (≥0.89) divided strains into two main groups: one characterized by iso-C15:0 and the other by anteiso-C15:0.

Conclusions:

• Cellular fatty acid composition, particularly the prevalence of iso-C15:0 and anteiso-C15:0, can aid in differentiating staphylococcal species.
• This analysis provides a basis for classifying staphylococcal strains, with potential applications in veterinary microbiology.
• Further research can refine the use of fatty acid profiles for precise identification and epidemiological tracking of staphylococci.