Overview
Brevibacterium linens is a Gram-positive, rod-shaped bacterium classified under Actinobacteria. It thrives in saline environments and is best known for its pivotal role in the dairy industry, where it contributes to the characteristic flavors and aromas of surface-ripened cheeses. First isolated from human skin, this bacterium was later identified as the key microorganism responsible for the orange rind and pungent smell of washed-rind cheeses. Its ability to break down proteins and lipids makes it indispensable for developing complex flavor profiles during cheese maturation.
Physical and Chemical Properties
This bacterium forms distinctive orange-pigmented colonies due to carotenoid production. It is aerobic, mesophilic (optimal growth at 20-30°C), and highly halotolerant, surviving salt concentrations up to 15%. B. linens exhibits strong proteolytic and lipolytic activity, generating volatile sulfur compounds like methanethiol that define the aroma of smear-ripened cheeses. Its cell wall contains meso-diaminopimelic acid, a characteristic component of Actinobacteria.
Main Applications
The primary industrial use of B. linens is in cheese production, particularly for Limburger, Munster, and Livarot varieties. It forms part of the 'smear' culture applied to cheese surfaces during ripening. Beyond dairy, selected strains show potential in bioremediation due to their ability to degrade aromatic compounds. Some pharmaceutical applications exploit its enzymatic activities for specific biotransformations.
Safety and Storage
While B. linens is GRAS-certified for food use, industrial cultures should be handled under biosafety level 1 conditions. Proper strain maintenance requires lyophilization or storage at 4°C in appropriate media. Cross-contamination risks exist in cheese facilities, as this bacterium can colonize equipment. Regular sanitation protocols are necessary to maintain controlled fermentation conditions.
B2B Procurement Guide
When sourcing B. linens cultures, verify the supplier provides Certificate of Analysis documents confirming strain identity, purity, and CFU counts. Opt for suppliers specializing in dairy cultures with proven cheese application experience. Consider purchasing trial quantities (10-100g) to test performance before large-scale orders. Pricing varies significantly based on strain specificity and preparation method (lyophilized vs. frozen cultures).
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