Microgreens & Sprouts Quat Residue Testing

SKU: 33819-100

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Safeguard microgreens and sprouts with Indigo® residual quat test strips. Verify sanitizer rinses are ≤100 ppm (detectable down to 10 ppm) to protect vegan and raw diets, meet HACCP/FSMA standards, and prevent microbial risks in high-moisture growth environments.

Microgreens and sprouts are prized by consumers seeking fresh, nutrient-dense foods and are especially popular in vegan, vegetarian, and raw diets. Because these delicate products are consumed raw without a kill step, they are particularly vulnerable to foodborne pathogens such as E. coli and Salmonella. In indoor farming and hydroponic facilities, quaternary ammonium sanitizers (QACs) are widely used to disinfect trays, irrigation systems, and harvest equipment.

However, residual sanitizer levels must be tightly controlled to protect both consumer safety and probiotic gut health associated with vegan lifestyles. Indigo® residual quat test strips provide fast, reliable verification that sanitizer residues are ≤100 ppm, with sensitivity down to 10 ppm, ensuring compliance with HACCP, FSMA, and organic certifications while maintaining consumer trust.

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 Microgreens & Sprouts

  • Verify low residues: Confirm surfaces are ≤100 ppm with Indigo® strips, detecting down to 10 ppm.
  • Protect raw consumption: Test trays, irrigation lines, and harvest tools to prevent sanitizer carryover.
  • Address high-risk pathogens: Focus on Salmonella, E. coli O157:H7, and Listeria in growing and handling areas.
  • Support vegan & organic claims: Demonstrate sanitizer control to reassure consumers seeking natural, plant-based foods.
  • Preserve product quality: Avoid sanitizer residues that can cause leaf burn, bitterness, or shortened shelf life.
  • Document compliance: Maintain records for FSMA, HACCP, and organic audits to satisfy inspectors.

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
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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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