You are viewing United States

Keeper® and Keeper® Professional for Post-Harvest Processing

In producing post-harvest fruits and vegetables, their safety and shelf-life are important concerns. Microbiological contaminants can negatively affect post-harvest products at various stages of the production process further affecting product yield. Kemin Bio Solutions offers Keeper® and Keeper® Professional products for post-harvest products. Keeper products are antimicrobial agents used to eliminate pathogens, extend shelf life, and improve the quality of post-harvest products.     

Keeper Products

Keeper and Keeper Professional are antimicrobial products for post-harvest processing. Keeper products are acidified sodium chlorite that generates chlorine dioxide once activated with any food grade Generally Recognized as Safe (GRAS) acid to acidify sodium chlorite. 

  • Keeper - contains 3.35% sodium chlorite
  • Keeper Professional - contains 8.35% sodium chlorite


Keeper products for post-harvest processing effective against Campylobacter, E. coli O157:H7, Listeria, Salmonella, and other pathogens of concern (Figure 1). Keeper products for post-harvest processing have shown to be more effective than other common antimicrobial agents including quaternary ammonia, iodophors, peracetic acid, and sodium hypochlorite (chlorine) (Figure 2). 

bacteria vs keeper

Figure 1. Treatment with 100 ppm Keeper for 1 minute resulted in a >99.9% reduction in Campylobacter, E. coli O157:H7, Listeria, and Salmonella compared to untreated samples.

bacteria s biocides

Figure 2. Concentration of Keeper compared to other common biocides to reduce E. coli O157:H7 and S. aureus by 99.9%.


Keeper Post-Harvest Application Chart


  • Two convenient concentrations:
    • Keeper: 3.35% sodium chlorite
    • Keeper Professional: 8.35% sodium chlorite
  • Broad spectrum antimicrobial activity
  • Effective over a broad pH range (1-10)
  • Can be used at or near neutral pH
  • Prevents the formation of slime
  • Low toxicity
  • Low corrosion potential
  • No significant chlorination or trihalomethane formation
  • Can be used with automated delivery systems


  • U.S. Food and Drug Administration (21 CFR 173.325)
  • U.S. Department of Agriculture Foor Safety and Inspection Service Directive 7120
  • Orthodox Union Kosher
  • OMRI Listed® for organic use


Activation of Keeper products for post-harvest can be applied manually or is offered with a variety of user-friendly, cost-effective application systems that are safe and eliminate the need for manual mixing. Test kits are also available to conveniently monitor concentrations of Keeper products in process water for post-harvest. Our Kemin Application Solutions team works with you to develop application solutions to provide support to ensure our liquid products are applied safely, accurately, and efficaciously.  

The Kemin Customer Laboratory Services team provides dedicated laboratory and analytical support to our customers to ensure Kemin ingredients meet your performance goals. 

Let's Work Together! Contact Us: Contact Us