Psychrotrophic Count Testing
Psychrotrophic bacteria are cold-tolerant microorganisms capable of growing at refrigeration temperatures, often responsible for spoilage in perishable foods. Psychrotrophic Count Testing assesses microbial load in chilled products, helping ensure shelf-life integrity, cold-chain hygiene, and product safety.
Purpose & Relevance
- Shelf-Life Estimation: Identifies microbial growth potential in refrigerated conditions, especially in dairy, meats, and seafood.
- Spoilage Monitoring: Detects organisms that cause off-odors, gas, slime, or discoloration during cold storage.
- Process Hygiene Indicator: Helps verify post-pasteurization contamination or packaging cleanliness.
- Cold Chain Validation: Assesses microbial load increase during transportation or storage breaks.
- Export & Quality Compliance: Meets expectations of regulatory agencies and quality assurance protocols.
Sample Types
- Pasteurized milk, cream, and UHT dairy
- Fresh and processed meats and poultry
- Chilled seafood (raw or packed)
- Pre-cut fruits and salads
- Refrigerated sauces, dips, and RTE (Ready-to-Eat) foods
Testing Methodology
- Plating on Standard Media: Samples are diluted and plated on Plate Count Agar (PCA) or similar, with incubation at 6–8°C for 10 days or 7°C for 10 days as per ISO 17410..
- Colony Enumeration: Growth is recorded as CFU/g or CFU/mL, with attention to colony morphology.
- Confirmation Techniques: Further identification may use Gram staining, oxidase testing, or MALDI-TOF if spoilage traits or elevated counts are noted.
Reporting & Standards
- Accreditation: ISO/IEC 17025-certified laboratory procedures
- Report Format: Digital Certificate of Analysis with test method, incubation time/temp, CFU values, and expert remarks
- Reference Standards: ISO 17410, BAM (FDA), AOAC
Leading food testing laboratory ensuring safety and quality in the food industry.
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