Certified Reference Microorganisms (CRMs) are materials which are produced under ISO guide 34 and certified according ISO/IEC 17025. Sigma-Aldrich provides two product lines of microbiology CRMs. The LENTICULE® discs and Vitroids™ is the own innovative developed line of Sigma-Aldrich with discs containing ATCC strains. This discs containing a defined certified colony forming units (CFU) with a standard deviation and an expanded uncertainty.
Both LENTICULE® discs and VitroidsTM discs consist of bacteria or fungi in a solid water soluble matrix. Microorganisms in this form are stable for at least one year and are in a viable stage (no lag phase or recovery time). They are intended to be used as daily internal quality control organisms. Additionally they are excellent for use in method development and validations, as starter cultures, for use in research studies and for educational purposes.
The product concentrations are designed in a range where no or only minimal dilution must be done. The discs dissolve in liquid media and on agar plates which mean easy handling but it is also a very economical solution. Most solid and liquid medium or rehydration buffer can be used.
For more information, visit Sigma-aldrich.com/vitroids or visit the booth at LabAnalyse.