Pesticides in Food

Consumers are increasingly interested in having knowledge about what pesticides are applied to the food products they consume.Pesticides being widely used in the control of plant pathogens can remain in small quantities on the fruits, vegetables, grains and other food products we consume. To regulate the amount of pesticide residues consumers are exposed to, global food safety organizations, including the US EPA, control both the pesticides that can be applied to food products and the limits of pesticide residues allowed to remain on the food product as it is passed to the consumer.

High Throughput Homogenizers for QuEChERs Pesticide Extraction

The most common method for extraction of pesticide residues from food material is the QuEChERs method, that was introduced in 2003 for “Quick, Easy, Cheap, Effective, Rugged and Safe” extraction of multiple pesticides and has since been modified and optimized to support a wide range of analytes. The QuEChERs method is widely used and is formalized in two documented methods, AOAC 2007.01 and EN 156223. Prior to the QuEChERs extraction, the sample must first be comminuted. The comminuting process can be performed in a number of ways including, manual chopping, blending and milling.

Omni International offers a variety of technologies for preprocessing of food products prior to pesticide extractions. For large plant samples, the Omni Mixer and Macro homogenizers are capable of rapid sample dissociation within sealed chamber assemblies. The Omni Mixer and Macro homogenizers are ideal for lower throughput labs that require complete plant sample disruption and the flexibility to process samples in a wide range of volumes.

Automated Homogenizers for Plant Sample Processing

When high throughput sample processing is required, the Omni Prep 96 automated rotor-stator homogenizer provides walk-away sample processing of up to 96 samples per cycle. The Omni Prep 96 is compatible with both stainless steel and Omni Tip disposable generator probes.

A more recent approach has been to homogenize the plant material through bead beating on the Bead Ruptor 24, a process in which the plant material is placed in a sealed tube with beads and vigorously shaken to produce a final homogenate of sub-micron particle sizes. The advantage of this approach is that the homogenization can be performed in a 50 mL centrifuge tube containing 15 g of plant material and 5 to 15 mL of acetonitrile which is the starting solvent for common QuEChERs extractions. The Bead Ruptor offers a single platform for both sample dissociation of even fibrous plant samples and repeatable shaking of the QuEChERs reagents during the pesticide extraction phase.

Product Lines

  • Prep 96 Homogenizer

    Omni International "The Homogenizer Company" Model: Prep 96 Homogenizer

    The Omni Prep 96 Homogenizer processes up to 96 samples per cycle with volumes ranging from 250 µl to 30 mL. Compatible with 5, 7, and 10 mm stainless steel probes or Omni Tip disposable generator...

  • Bead Ruptor 24 Elite

    Omni International "The Homogenizer Company" Model: Bead Ruptor 24 Elite

    The most powerful and scalable bead mill available
    Power. 0.8 - 8 m/s | Vol. 0.25 mL - 50 mL | Samples. 1-96