Residual Quat Testing for Berries

SKU: 33819-100

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Indigo® QAC test strips detect and verify quaternary ammonium residues in berry wash systems, ensuring safe sanitation, minimizing allergen cross-contact risks, and helping processors comply with HACCP, FSMA, and FDA food safety standards.

Fresh and frozen berries such as strawberries, blueberries, raspberries, and blackberries are highly perishable and easily damaged by microbial contamination. Sanitizers like quaternary ammonium compounds (QACs) are widely used in berry handling facilities, but residues must be carefully controlled to avoid affecting taste, shelf life, or consumer perception. Indigo® residual quat test strips, which detect as low as 10 ppm, provide packers and processors with a simple, effective tool to confirm that cleaning agents have been fully rinsed away. This protects both compliance with food safety regulations and the reputation of berries as a clean, natural product.

All Indigo® Quat (QAC) test strips come in 100 (not 50) strips per pack & 3 year minimum guaranteed shelf life backed by a Certificate of Analysis, Stability & SDS documents as listed below; Certificate of Conformance on request. Be prepared for any health & safety audit or inspection.
Details Specs Docs Reviews
Details

Best Practices for Berry Processors

  • Monitor residues on washing flumes, sorting belts, and packaging lines; ensure levels are ≤100 ppm, using Indigo® residual QAC test strips which detect down to 10 ppm.
  • Protect consumers who expect “natural” or “chemical-free” labeling by minimizing sanitizer carryover.
  • Demonstrate compliance with HACCP plans and GFSI-benchmarked schemes (e.g., SQF, BRCGS).
  • Reinforce food safety assurances for both domestic and export berry markets.

 

The directions on the test strip bottle are for testing liquid quat solutions. Test surfaces for residues by first wetting the strip's testing pad with water (deionized or distilled if available). Then press against fruits, vegetables, cutting boards, utensils, etc. for at least 10 seconds & then compare against the color chart.

Levels less than "10" ppm are impossible to determine but some organic certifications call for "0" ppm. This is because water alone causes a reading of 10ppm. Read more in our blog on What 10ppm really means? when measured on surfaces of knives, cutting boards, fruits or vegetables.

Related information or images
Residual Quat 10-100 ppm

Residual Quat 10-100 ppm

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Specifications

Swish strip in liquid 5 times & then compare to color chart after 10 seconds for reading at ≤10-30-60-80-100ppm ppm for quaternary ammonium disinfectant concentration.

  • Indigo® test strips have a guaranteed minimum 3 year shelf life but are stored in desiccant lined vials so actual shelf life can be 5+ years.
  • For technical explanation, read: Sanitizer Test Strip Expiration; Good Today, Dead Tomorrow?
  • These strips measure any quat formulation
  • Indigo® QAC test strips are calibrated for Oasis 146: see details. Consult your supplier if necessary.
  • The number of strips (100) per vial is approximate.
Documentation

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Quat - QAC Test Strips 10-100ppm Stability Statement Indigo Quat - QAC Test Strips 10-100ppm Certificate of Analysis Indigo Quat - QAC Test Strips 10-100ppm SDS

Indigo® brand test strips are Made in USA & tested for accuracy using NIST compliant standards. Be prepared for any health & safety audit or inspection.

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