PY Lactate

Peptone Yeast Extract Broth with Lactate (PY LACTATE)

Peptone Yeast Extract Broth with Lactate (PY LACTATE) is designed for the determination of lactate fermentation by anaerobic bacteria for identification.

PY Lactate Broth

PY Lactate Broth Packaging

Catalog #
AS-846 PY Lactate 10 tubes not available

Non-stock item: 15 pack minimum order, allow 2-4 weeks for delivery.


Product Description & Summary

PY LACTATE is a non-selective broth medium that was formulated by the VPI group for use in chromatographic analysis of cellular fatty acids within the MIDI MIS system. This media is also useful in the analysis of short chain fatty acid end products from the fermentation of lactate. Appropriate control strains cultured in this medium should show characteristic metabolic products when analyzed using gas liquid chromatography. Both types of analysis are useful in the identification of clinically significant anaerobic bacteria. A peptone yeast extract basal medium is supplemented with glucose and Tween 80 to stimulate the growth of gram-positive organisms. This media is prepared, dispensed, and packaged under oxygen-free conditions to prevent the formation of oxidized products prior to use.

Interpretation of Results & Limitations

Uninoculated PY-based broths should show only trace amounts, if any, of volatile and nonvolatile fatty acids when tested with gas liquid chromatography.

PY LACTATE will not provide complete information for identification of bacterial isolates. Additional test procedures and media are required for complete identification. Consult reference materials for additional information.

Quality Control

The following organisms are routinely used for quality assurance performance testing, for growth and the fermentation of lactate, at Anaerobe Systems. PY LACTATE is suitable for use in lactate utilization on the basis of propionate production through chromatographic methods; however, Anaerobe Systems quality control procedures are limited to growth performance.


Organism Tested ATCC # Results Time
Bacteroides fragilis 25285 Growth 24 hrs
Prevotella melaninogenica 25845 Growth 24 – 48 hrs
Bacteroides vulgatus 8482 Growth 24 hrs
Fusobacterium nucleatum 25586 Growth 24 – 48 hrs
Fusobacterium necrophorum 25286 Growth 24 – 48 hrs
Clostridium perfringens 13124 Growth 24 hrs
Peptostreptococcus anaerobius 27337 Growth 24 hrs
Veillonella parvula 10790 Growth 24 – 48 hrs

Product Storage & Shelf Life

Storage: Upon receipt, store at room temperature in original package until used. Avoid overheating or freezing. Do not use media if there are signs of deterioration (shrinking, cracking, or discoloration due to oxidation of media) or contamination. The expiration date applies to the product in its original packaging and stored as directed. Do not use product past the expiration date shown on the label.

Shelf Life: 1 year from date of manufacture.