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    ZymoBIOMICS Microbial Community DNA Standard II (Log Distribution)


    ZymoBIOMICS Microbial Community DNA Standard II (Log Distribution)

    Cat # Name Size
    D6311 ZymoBIOMICS Microbial Community DNA Standard II (Log Distribution) 220ng / 20µl



    • Log abundance distribution: assess detection limit of as low as the DNA of three microbes.
    • Accurate composition: cross validated with multiple types of measurements.
    • Microbiomics QC: ideal for quality control of microbiome measurements.

    ZymoBIOMICS Microbial Community DNA Standard II (Log Distribution) is a mixture of genomic DNA of eight bacterial and two fungal strains. The microbial standard is accurately characterized and contains negligible impurity (< 0.01%). It was constructed by pooling DNA extracted from pure cultures of the ten microbial strains. The DNA from each pure culture was quantified before pooling. After mixing, the microbial composition was confirmed using NGS-based sequencing. This microbial standard can be used to assess the performance of microbiomics workflows and can also be used as a positive control for the routine QC purpose. Theoretical Composition Based on Genomic DNA: Listeria monocytogenes - 89.1%, Pseudomonas aeruginosa - 8.9%, Bacillus subtilis - 0.89%, Saccharomyces cerevisiae - 0.89%, Escherichia coli - 0.089%, Salmonella enterica - 0.089%, Lactobacillus fermentum - 0.0089%, Enterococcus faecalis - 0.00089%, Cryptococcus neoformans - 0.00089%, and Staphylococcus aureus - 0.000089%.

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    Applicable For NGS, microbiomics, metagenomics.
    Purity Contains < 0.01% foreign microbial DNA.
    Sample Source Eight bacteria (3 Gram-negative and 5 Gram-positive) and 2 yeasts.

    We recommend working backwards from the analysis. First optimize your library prep with the ZymoBIOMICS Microbial Community DNA Standard (D6305, D6311) to assess bias in PCR, sequencing, bioinformatics, etc. Once your results have low/no bias when compared to the theoretical composition, then use the whole cell ZymoBIOMICS Microbial Community Standard (D6300, D6310) to assess bias in lysis efficiency.

    No, the Microbial Community Standard is designed to assess the efficiency of the lysis method and is intended to be run in parallel with your samples. If all the organisms can be detected at/near the theoretical abundance, you can be confident your extraction method is unbiased.

    The chemistry of the Qiagen Kits (QIAamp Powerfecal, DNeasy Powersoil) and the storage solution the Microbial Community Standard is stored in (DNA/RNA Shield) are not completely compatible. Instead, less input volume should be used (25 ul).

    You can find the reference genome and 16S/18S sequences here:

    This may indicate an issue with the lysis method, which can be biased toward gram negative bacteria. See the Optimized Lysis Protocols under Documents for a table of bead beating devices and protocols validated by Zymo Research.

    Devices found to underrepresent tough-to-lyse organisms under all tested conditions:

    • Retsch Mixer Mills
    • Tissues Lyzers
    • MP Fast Prep 96

    We use an in-house curated database to generate the data for the standards.

    Please contact Technical Support at for raw sequencing data.

    The expected DNA fragment size is <15kb.

    This could indicate bias in the workflow, such as inefficient lysis, library prep or bioinformatics analysis.

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