Lab Insights: What Our Data Shows About PurePitch Next Generation Performance

TLDR: Why This Matters for Brewers

• Longest shelf life available for liquid yeast
  PurePitch Next Generation allows you to buy and store yeast longer, reducing the need for tight brew-day timing. This makes planning easier and lets you order yeast for multiple batches at once, saving on shipping costs.
• Consistently higher yeast quality
  The improved packaging maintains exceptional viability and fermentation performance throughout storage, giving you predictable attenuation, clean fermentations, and reliable results batch after batch.
• Packaging designed specifically for liquid yeast
  PurePitch Next Generation is the only packaging engineered specifically for liquid yeast cultures. No other yeast packaging on the market is built with yeast health as the primary design focus.

Read on to learn about the studies performed!

PurePitch Next Generation is the only packaging designed specifically to store liquid yeast cultures. This updated design builds on the original PurePitch, delivering the same top-quality cultures with an improved, modular, and easy-to-use format. Unsurprisingly, these improvements provide clear benefits to brewers, including extended storage and more consistent fermentation performance.

We conducted two studies to evaluate the improvements of PurePitch Next Generation. 

Key Findings: Exceptional Viability and Consistent Fermentations

Study 1

The first study tracked the viability, performance, and purity of PurePitch Next Generation pouches throughout storage.

The scope of this experiment was simple: monitor yeast viability over time, run mini fermentations to evaluate performance, and check for microbial contamination after each sampling and recapping of the port. This was performed numerous times on various strains. Below we demonstrate an example for WLP066 London Fog Ale Yeast.

Data tracked over 28 days below for a lot of WLP066 London Fog Ale Yeast in PurePitch Next Generation packaging shows outstanding results consistent with our testing performed. Viability remained remarkably high, consistently ranging from 99.31% to 99.53% throughout the entire study with variance due to the inherent variance in cell counting. Starting viability on Day 0 was 99.45% and remained consistent with a final test viability of 99.48% on Day 28.

Mini fermentation results demonstrated excellent consistency in performance. The attenuation at 72 hours remained strong, ranging from 82.40% to 83.20% across all measured time points (Day 3, 7, 10, 14, and 28). 

The starting pH was 4.68, lower than typical knock-out pH targets due to these mini-fermentations being run in a lab and not for consumer consumption. The important factor to evaluate is the consistent, quick pH drop in the initial 72 hours. All fermentations showed that pH after 72 hours consistently dropped signaling active metabolism and healthy fermentations.

Microbial contamination checks (HLP, WLD, LCSM) showed clean results with proper handling. Contamination was None Detected on Day 0, Day 3, Day 7, and Day 28.

Want to see how PurePitch Next Generation performs with your house strains?
Browse yeast strains available in PurePitch® Next Generation packaging.