Liquid Lactobacillus strain YF‑998 Sour yes sour 100 mL

YF‑998 Sour yes sour! is a liquid strain of Lactobacillus plantarum specifically designed for producing sour and tart beers. It acts quickly and cleanly, lowering the pH between 2.5 and 3.5 without forming spores. Active at 37 °C, it creates a bright acidity and dominant citrus notes while preserving the purity of the aromatic profile. Easy to control, it can be neutralized by boiling after acidification, offering great flexibility for both home and professional brewers.

Why choose this product?

• Fast and clean acid fermentation for sour and fruity beers.
• Dominant citrus profile and stable pH between 2.5 and 3.5.
• Non‑spore‑forming strain, easy to remove by boiling.

Technical characteristics

• Strain: Lactobacillus plantarum
• Fermentation type: Wild (lactic acid)
• Origin: Natural
• Optimal temperature: 15–37 °C (maximum activity at 37 °C)
• Final pH: 2.5–3.5
• Recommended styles: Gose, Lambic, Berliner Weisse, Sour IPA
• Format: 100 mL
• Content: > 100 billion viable cells
• Equivalent: 1 packet of dry yeast 11 g
• Suitable for: 20–25 L brews (gravity ≤ 1.055)
• Storage: 2–5 °C, up to 4 months
• Nutrients or starters not included

Rolling Beers Tips

• Maintain temperature around 37 °C for fast and clean acidification.
• Monitor pH: stop fermentation between 2.5 and 3.5 for optimal balance.
• Remove the strain by boiling after acidification if needed.

Product FAQ

• Is it suitable for sour beers? Yes, it is specifically developed for Gose, Lambic and Berliner Weisse styles.
• Can it be neutralized? Yes, it does not form spores and can be eliminated by boiling.
• Is a starter required? No, the strain is ready to use for standard brews.