Antifungal Activity of Some Essential Oils Emulsions Against Fungi Contaminating Ras Cheese

Area of Science:

• Food Science and Technology
• Microbiology
• Natural Product Chemistry

Background:

• Ras cheese is a popular dairy product susceptible to fungal contamination during ripening and storage.
• Fungal growth can lead to spoilage and the production of harmful mycotoxins, posing a risk to consumers.
• Identifying and controlling these fungi is crucial for ensuring the safety and quality of Ras cheese.

Purpose of the Study:

• To detect and identify fungal species contaminating Ras cheese.
• To evaluate the efficacy of essential oils from clove, thyme, and peppermint in inhibiting fungal growth.
• To explore natural methods for controlling fungal contamination in Ras cheese.

Main Methods:

• Fungal isolation and identification from contaminated Ras cheese samples.
• In vitro testing of various concentrations of clove, thyme, and peppermint essential oil emulsions against isolated fungi.
• Quantification of mycotoxins (Ochratoxin A, Aflatoxin M1, B1, B2) in cheese samples.

Main Results:

• Fungal genera including Aspergillus, Mucor, Eurotium, and Mortierella were identified.
• Ochratoxin A and Aflatoxin M1 were detected in some samples; Aflatoxin B1 and B2 were not detected.
• Clove essential oil emulsion completely inhibited fungal growth at 0.5%, followed by thyme at 1%. Peppermint oil was less effective.

Conclusions:

• Clove and thyme essential oil emulsions demonstrate significant antifungal activity against fungi isolated from Ras cheese.
• These essential oils show promise as natural preservatives to enhance the safety and shelf-life of Ras cheese.
• Further research is recommended to optimize the application of these essential oils for industrial food production.