MRM Method Builder

    Build GC-QQQ MRM methods for pesticide & environmental analytes — in minutes

    Paste compound names or CAS.
    Get curated GC-QQQ Q1/Q3 transitions + RI-based RT windows — export ready.

    Built for pesticide residue screening & environmental contaminant labs.

    Supports pesticide & environmental analytes

    Features

    Build GC-QQQ methods for pesticide and environmental analytes in minutes — 1,100+ compounds supported.

    Pesticide & environmental library

    Check coverage for pesticide residues and environmental contaminants by CAS or compound name before you build.

    Auto MRM transitions (Q1/Q3)

    Generate curated Q1/Q3 pairs for screening workflows from your compound list or CSV.

    RI→RT prediction & RT windows

    Calibrate with C8–C35 alkanes to predict RT windows from RI and reduce manual RT entry.

    Live demo

    See what you get: GC-QQQ transitions + RT/RI-ready exports in minutes.

    mrmbuilder.com

    Method Generation

    Input Compounds
    127 compounds matched
    Select GC Method
    Standard Constant Flow (~40.5 min)
    RI→RT Prediction
    In progress...
    Export
    Pending...

    Generated Transitions

    0 transitions
    CompoundCASTransition #Q1 (precursor m/z)Q3 (product m/z)RIRT (min)RT window
    Chlorpyrifos2921-88-2
    #1
    		314.0286.0184518.11±0.30
    Chlorpyrifos2921-88-2
    #2
    		314.0258.0184518.11±0.30
    + 3 more transitions (Show more)
    Malathion121-75-5
    #1
    		173.099.0170216.45±0.28
    Malathion121-75-5
    #2
    		173.0127.0170216.45±0.28
    + 3 more transitions (Show more)
    Fenitrothion122-14-5
    #1
    		277.0260.0159814.23±0.25
    Fenitrothion122-14-5
    #2
    		277.0109.0159814.23±0.25
    + 3 more transitions (Show more)
    Diazinon333-41-5
    #1
    		305.1169.1165015.02±0.27
    Diazinon333-41-5
    #2
    		305.197.0165015.02±0.27
    + 3 more transitions (Show more)
    Carbendazim10605-21-7
    #1
    		192.0160.0152012.45±0.22
    Carbendazim10605-21-7
    #2
    		192.0132.0152012.45±0.22
    + 3 more transitions (Show more)
    Aldrin309-00-2
    #1
    		363.0293.0175517.02±0.30
    Aldrin309-00-2
    #2
    		363.0255.0175517.02±0.30
    + 3 more transitions (Show more)
    Parathion56-38-2
    #1
    		292.0109.0163214.85±0.27
    Parathion56-38-2
    #2
    		292.0139.0163214.85±0.27
    + 3 more transitions (Show more)
    Permethrin52645-53-1
    #1
    		183.1152.1189018.95±0.32
    Permethrin52645-53-1
    #2
    		183.1127.1189018.95±0.32
    + 3 more transitions (Show more)

    Pricing

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    Forever Free

    Free

    Try the workflow and preview results

    $0
    Check library coverage (CAS or compound name)
    Preview limited: 10 compounds × 2 transitions each
    RI→RT prediction included
    1 free CSV export credit (one-time)
    GC method (.txt) export: always free
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    $19/credit
    Full preview: all compounds, all transitions
    $19 = 1 CSV export credit
    No compound limit per export
    RI→RT prediction included
    GC method (.txt) export: always free

    FAQ

    Answers to common questions about RT prediction and method generation

    Ready to build your method?

    Paste your list → Check coverage → Generate transitions

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