The Gram Negative Vial is a general screening vial for gram negative organisms in personal care and cosmetic products. The vial has an assay time of 24 hours for most applications. The vial uses a selective media and antibiotic supplement. As organisms grow in the broth medium, the carbon dioxide (CO2) produced diffuses through a membrane layer in to a soft agar plug containing a dye indicator. The membrane layer also serves as a barrier, eliminating product interference within the reading window. The color change in the dye is read by the instrument.
Analyte Gram-negative bacteria
Brand Soleris®
Incubation Time 24 Hours
Limit of Detection Dilute to Specification or Presence/Absence (with pre-incubation)
Platform Rapid Microbiology
Quantity per Package 100 vials
Result Type Quantitative
Testing Time 24.00 Hours
Volume 9 mL

  1. BioLumix System (BLX-32)
  2. Vancomycin (not available through Neogen)

Dependent on sample tested:

  1. pH meter of pH paper
  2. Sterile 1 N to 5 N sodium hydroxide (NaOH) and/or hydrochloric acid (HCl)
  3. Tryptic Soy broth, 90 mL (BLX-TSB90) or other designated neutralization broths.


Our customers’ success is our shared success. Our experts are ready to train you and your team on our solutions, so you can rest easy knowing procedures are performed properly and yield accurate results. In addition, we provide certificates upon completion of training to provide you with the documentation needed for audit traceability.



Our experts are here to help. If you need information beyond what is provided in Validation Reports under the Documents tab, please contact us and we will be happy to assist you. Learn more