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Pesticide Multi-Residue Analysis (MRA) - Organic Screen

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  • 7-9 business days
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Pesticide Multi-Residue Analysis (MRA) - Organic Screen

Technical data sheet


Method description

Pesticides in this screen are extracted using modifications of the QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method. The QuEChERS method, originally developed by the FDA and USDA, is an AOAC Official Method (2007.01).

Modifications were necessary for the extractions of pesticides in dry commodities (J. Agric. Food Chem, 2010, 58, 5959-5972) and high-fat commodities (J. Agric. Food Chem, 2010, 58, 5950-5958).

A mixture of acetonitile and water (for dry commodities) or acidified acetonitrile (for high moisture fruits, vegetables, and other samples with high water content) is used to extract any pesticide residue from the sample. The sample and solvent are then treated with an extraction media to isolate the pesticide residues in the acetonitrile. The extract is cleaned using dispersive solid-phase extraction. Cleaned extracts are analyzed by Capillary Gas Chromatography Time of Flight Mass Spectrometery (GC/TOFMS), Ultra Performance Liquid Chromatography Tandem Mass Spectrometry (UPLC/MSMS), and Gas Chromatography Tandem Mass Spectrometry (GC/MSMS). Identification, confirmation, and quantification are performed using both technologies. Sample extracts are compared against a matrix-matched standard. Method and instrument performance standards are analyzed with each sample to ensure quality results.

Acceptable matrices

Baking mixes, beans, cereals, doughs, flaxseed, fruit and vegetable juices, fruits, grains, pasta and semolina, pastries, popcorn (no butter), soups, sugar (corn syrup), vegetables, water, nuts, hay, fresh (not dried) herbs

Please contact us for matrix-specific questions.

Unacceptable matrices

Honey, nutraceuticals, raw ingredients with oil base, Starches, fiber ingredients, supplements, vitamin premixes, dairy, meat

Unacceptable matrices will be sent to a third-party lab for testing.



Method reference

AOAC 2007.01 with modifications

Reportable unit

ppm (mg/kg)

Sample size requirements

500 grams

Information required by submitter

Please provide fat estimates.

Please do not write with a marker or a Sharpie on the sample or sample packaging as this may contaminate the sample and affect results.

Additional information

If an incurred residue is detected, it must be validated prior to being reported as a verified residue. A non-verified residue is a presumed detection or estimated concentration. The concentration reported could change with further validation work. Validation of a non-verified residue can be requested within 30 days from the time the residue is reported. Validation testing costs $213 for up to 5 analytes.

Samples will be reported as follows:

Non-Detect Samples with no detected residues
Verified Residues < LOQ: Residues between the limit of detection (LOD) and the limit of quantitation (LOQ), with the LOQ following in parenthesis.
Samples with residues detected above the LOQ will be reported with a value.
Non-Verified Residues < LOQ: Residues between the limit of detection (LOD) and the limit of quantitation (LOQ), with the LOQ following in parenthesis.
Samples with residues detected above the LOQ will be reported with a value.
Approaching LOD: Analyte is approaching the LOD for the method.  The LOD will follow in parenthesis.
Detected but not quantified: Analyte has been detected but is unable to be quantified.

Certain analytes may be excluded from a screen due to specific matrix interference. For a complete list, please contact us.

The analytes found in the organic screen are chosen based on the National Organic Program recommendations.

This test is ISO/IEC 17025 accredited through A2LA Certificate #2769.01

*Prices and offerings are subject to change without notice.

Common Pesticide Multi-Residue Analysis (MRA) - Organic Screen Testing Questions

While our sales and customer service team are happy to answer general testing questions, consultations typically start at a rate of $250 per 30 minutes regarding the interpretation of reported test results or questions about our test methods. We cannot consult on regulations, tolerance limits, or claims.

We make every effort to keep our methods and detection limits up to date according to the latest standards and qualifications. If you have any questions regarding the limit of detection/quantification or method references, please contact our Customer Service team at 1-800-245-5615.

Our standard turnaround time is 10 business days for most assays. There are some assays that require a longer turnaround time. We also offer a RUSH service that is half the time of the standard turnaround time of the assay at double the cost of the assay. A few assays that we provide cannot be rushed due to the nature of the test. Please check the specific assay you are interested in regarding the ability to RUSH the turnaround time.

Medallion Labs, a division of General Mills, offers multiple areas of expertise for analytical testing and product evaluation for the food and ingredient industry. Our areas of expertise include Chemical Analysis, Nutritional Analysis, Food Safety, Shelf Life Studies, Microbiology, Specialty Fibers, Physical Testing, Allergen Testing, as well as Product Evaluation (which includes Product Performance and Sensory Evaluation) and Technical Consulting/Method Development. Our methods are developed for the testing of food products and ingredients.

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