Determinación de Staphylococcus aureus en bases líquidas de maquillaje expendidas en el mercado 9 de octubre de la ciudad de Cuenca- Ecuador

Abstract

Introduction: The microbiological safety of cosmetic products is a growing concern due to their direct contact with the skin and the possibility of causing infections if contaminated. In particular, Staphylococcus aureus (S. aureus) is a microorganism that, due to its ability to colonize the skin and mucous membranes, represents a significant health risk, especially in daily-use products such as liquid foundation. Objective: This research aimed to determine the presence or absence of S. aureus in liquid foundation sold in the “9 de Octubre” Market, Cuenca, Ecuador. Methodology: The research methodology was descriptive and observational, with a qualitative cross-sectional approach. Cultures were prepared using Petri dishes with Modified Letheen Agar (MLA) and seeded in duplicate. The colonies identified were transferred to mannitol salt differential agar and confirmatory biochemical tests were performed. Results: After analyzing 40 liquid foundation samples on differentiation agar (Mannitol salt), the presence of S. aureus was determined in only two different brands of the samples. Biochemical tests confirmed the presence of S. aureus in these samples. Conclusion: The analysis of the liquid foundation in this study determined a low prevalence of S. aureus. In conclusion, the positive results obtained are not representative to generalize the contamination of this cosmetic product