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  • Quick-Load® Low Molecular Weight DNA Ladder


    Quick-Load® Low Molecular Weight DNA Ladder is a pre-mixed, ready-to-load molecular weight marker containing bromophenol blue as a tracking dye.

    The DNA Ladder consists of a proprietary plasmid which is digested to completion with appropriate restriction enzymes to yield 11 bands suitable for use as molecular weight standards for agarose gel electrophoresis. This digested DNA includes fragments ranging from 25–766 base pairs. The 200 base pair band has increased intensity to serve as a reference point.


    Quick-Load LMW DNA Ladder visualized by ethidium bromide staining on a 1.8% TBE agarose gel. Mass values are for 0.5 µg/lane.

    Properties and Usage



    Effective Size Range

    25bp to 766bp

    Storage Temperature


    Storage Conditions

    3.3 mM Tris-HCl
    11 mM EDTA
    0.015% bromophenol blue
    0.017% SDS
    2.5% Ficoll®-400
    pH 8.0 @ 25°C


    1. Preparation of DNA: The double-stranded DNA is di­gested to completion with appropriate restriction enzymes, phenol extracted and equilibrated in storage buffer.
    2. Quick-Load Low Molecular Weight DNA Ladder is stable for at least 6 months at 25°C.
    3. In general, it is recommended to load 1µl per mm of gel lane.
    4. For long term storage, store at 4°C or -20°C. If stored at -20°C, mix well after thawing.


    1. Sambrook, J., Fritsch, E. F. and Maniatis, T. (1989). Molecular Cloning: A Laboratory Manual. (2nd ed.),pp.10.51-10.67, Cold Spring Harbor Laboratory Press.

    Supporting Documents

    Material Safety Datasheets

    The following is a list of Material Safety Data Sheets (MSDS) that apply to this product to help you use it safely. The following file naming structure is used to name these document files: [Product Name] MSDS. For international versions please contact us at info@neb.com.


    The Product Summary Sheet, or Data Card, includes details for how to use the product, as well as details of its formulation and quality controls. The following file naming structure is used to name the majority of these document files: [Catalog Number]Datasheet-Lot[Lot Number]. For those product lots not listed below, please contact NEB at info@neb.com or fill out the Technical Support Form for appropriate document.
    1. Why are the DNA ladders showing up on my Southern blot? What is the sequence or composition of the ladder bands?
    2. Why are there extra bands visible on polyacrylamide gels?
    3. Why is the separation of the lower bands incomplete?
    4. Can I use GelRed with the DNA Ladders from NEB?
    5. Can I use SYBR® with the DNA Ladders from NEB?
    6. Can I use Midori Green with the DNA Ladders from NEB?

    Selection Tools

    Mix well before use, especially after thawing.