Overview
Lactococcus plantarum is a Gram-positive, facultative anaerobic bacterium belonging to the lactic acid bacteria (LAB) group. It is non-motile and forms short chains or pairs of cocci. First isolated from plant materials, it has since been identified in fermented foods, dairy products, and the human gastrointestinal tract. As a versatile microorganism, L. plantarum plays a significant role in food biotechnology due to its ability to ferment carbohydrates into lactic acid. Its robustness in diverse environments (pH 3.5-7.0, temperatures 10-40°C) makes it commercially valuable for industrial applications.
Physical and Chemical Properties
L. plantarum exhibits typical LAB characteristics: it is catalase-negative, homofermentative (producing primarily L-lactic acid), and grows optimally at 30°C. The cells are 0.5-1.5 μm in diameter and stain purple in Gram tests due to their thick peptidoglycan layer. Metabolically, it can utilize various sugars (glucose, fructose, maltose) but lacks proteolytic activity. Its cell wall contains teichoic acids and surface proteins that contribute to adhesion properties. Commercial preparations often use protective agents (e.g., skim milk, trehalose) in freeze-dried forms to maintain viability.
Main Applications
In food production, L. plantarum is used as a starter culture for vegetable fermentations (sauerkraut, kimchi), dairy products (cheese, yogurt), and sourdough bread. Its acidification inhibits spoilage organisms while enhancing flavor profiles. The strain is increasingly used in probiotic supplements (109-1011 CFU/dose) for gut health, supported by clinical studies on its ability to modulate microbiota. Industrial applications include silage inoculants (improving animal feed preservation) and biocontrol agents (producing bacteriocins against pathogens like Listeria).
Safety and Storage
L. plantarum is classified as biosafety level 1 (BSL-1), posing minimal risk to healthy humans. However, proper handling procedures (gloves, masks) are recommended for powder forms to avoid inhalation. For storage, liquid cultures require refrigeration (2-8°C) with viability declining after 1-2 months. Freeze-dried powders remain stable for 12-24 months at ≤25°C if vacuum-sealed with desiccants. Avoid repeated freeze-thaw cycles and exposure to humidity >60% to prevent clumping and CFU loss.
B2B Procurement Guide
When sourcing L. plantarum, prioritize suppliers providing Certificate of Analysis (CoA) with: strain designation (e.g., ATCC 8014), viability (CFU/g), purity (absence of contaminants), and endotoxin levels (for pharmaceutical-grade). Bulk buyers should request trial batches to test performance in specific applications (e.g., acidification rate in dairy). Consider MOQs—typical industrial quantities range from 1kg to 25kg drums. Logistics must ensure cold chain maintenance for liquid/suspended forms during transit.
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