Physicochemical and microbiological profile of packed table olives

Area of Science:

• Food Science
• Microbiology
• Agricultural Science

Background:

• Table olives are a widely consumed food product with diverse processing methods.
• Understanding the physicochemical and microbiological profiles is crucial for food safety and quality.
• Water activity (aW), pH, and salt content are key indicators of microbial stability.

Purpose of the Study:

• To analyze the water activity, physicochemical properties, and microbial load of commercial table olive products.
• To assess the safety implications of observed microbial populations in relation to product characteristics.

Main Methods:

• Commercial table olive samples (green, directly brined, ripe) were analyzed for water activity (aW).
• Physicochemical parameters including pH and salt concentration were measured.
• Microbiological analysis was performed to identify and quantify microbial flora, including bacteria and yeasts.

Main Results:

• Average aW values were 0.976 (green), 0.977 (directly brined), and 0.990 (ripe olives).
• Mean pH values were 3.69 (green), 3.92 (directly brined), and 6.52 (ripe), with corresponding salt levels of 5.53%, 4.98%, and 2.55%.
• Lactic acid bacteria and yeasts were detected in some green and directly brined olives; spore-forming aerobes were present at low levels in some samples.

Conclusions:

• The physicochemical properties (aW, pH, salt) of the studied commercial table olives suggest microbial stability.
• Detected microorganisms, including lactic acid bacteria, yeasts, and low levels of spore-forming aerobes, do not pose a safety risk due to the product's characteristics.
• Further monitoring of microbial profiles in relation to processing methods is recommended for consistent product safety.