Food Grade Sanitisers Are Used in the Kitchen To Kill Bacteria

Anyone who’s worked in a commercial kitchen knows the rhythm — wipe down the counter, rinse the cutting board, then reach for the sanitiser. That third step isn’t optional; it’s the one that actually kills the bacteria cleaning alone leaves behind. This guide explains why food grade sanitisers are used in the kitchen to make surfaces safe, which chemicals work best, and exactly how to use them.

U.S. foodborne illness cases per year: 48 million (CDC) · Reduction of bacteria from proper sanitizing: up to 99.999% (NSF) · Concentration range for chlorine sanitizer on food surfaces: 50-200 ppm (FDA) · Contact time required for most chemical sanitizers: 30 seconds to 2 minutes (EPA)

Four legal requirements, one pattern: concentration and contact time are everything.

What is a food grade sanitiser used for?

Definition of food grade sanitiser

• A food grade sanitiser is a chemical agent approved for use on surfaces that come into contact with food, applied after cleaning to kill remaining bacteria.
• It must be labeled as “food grade” or “food contact surface safe” and used at concentrations defined by health codes.

The implication: not every disinfectant or bleach product qualifies — only formulations explicitly rated for food contact.

How it differs from detergent

• Detergents remove grease, dirt, and food debris; they do not kill bacteria.
• Sanitisers reduce the microbial load to safe levels, but they cannot penetrate soil — so cleaning must come first (University of Minnesota Extension (food safety authority)).

The trade-off: skipping the cleaning step means the sanitiser won’t reach the bacteria, no matter how strong the chemical.

Common types: chlorine, quaternary ammonium, iodine

• Chlorine (bleach): used at 50-200 ppm, requires 10-30 seconds of contact; inexpensive but can corrode certain metals.
• Quaternary ammonium compounds (quats): used at 200-400 ppm, contact time 30 seconds; stable at higher water temperatures and leaves an antimicrobial film.
• Iodine/iodophors: used at 12.5-25 ppm, contact time at least 30 seconds; effective but can stain surfaces (WebstaurantStore (industry resource)).

Each type has a sweet spot. The catch: water hardness and pH can neutralise quats, and high water temperature can break down chlorine too quickly.

What is the main reason for using a sanitiser in food preparation areas?

Preventing foodborne illness

• The CDC estimates that 48 million Americans get sick from foodborne pathogens each year. Proper sanitising after cleaning can reduce bacteria on surfaces by up to 99.999% (CDC (public health authority)).
• The main reason is practical: cleaning removes the dirt; sanitising kills the germs that cause illness.

Bottom line: Restaurants and home cooks who skip the sanitiser step are betting that a rinse is enough to prevent cross-contamination. The CDC data says otherwise.

Compliance with health department regulations

• In most U.S. jurisdictions, the FDA Food Code requires that food contact surfaces be sanitised after cleaning in commercial operations (Clatsop County, Oregon health code guidance).
• During a health inspection, the sanitiser concentration in sink compartments or spray bottles must be verified with test strips.

For commercial kitchens, compliance isn’t optional. Failing to maintain proper concentration can lead to failed inspections and fines.

Reducing cross-contamination risk

• A cutting board used for raw chicken then wiped with a damp cloth still harbours bacteria. A sanitiser spray kills them before the board touches cooked food (FoodSafePal (food safety training)).
• Cross-contamination is one of the top causes of restaurant foodborne outbreaks, and proper sanitising is a direct barrier.

What are the 4 cleaning agents or chemicals used for cleaning kitchen equipment?

Detergents

• Detergents like dish soap or all-purpose cleaners break down grease and food residue. They are the first step in any cleaning process.
• They are not designed to kill bacteria — only to lift and suspend soil for rinsing.

Solvents

• Used to dissolve tough grease or baked-on grime, typically on oven surfaces or range hoods.
• Solvents are abrasive and must be thoroughly rinsed before sanitising.

Acid cleaners

• Effective for removing mineral deposits, lime scale, and rust on dishwashers or coffee machines (WebstaurantStore (industry resource)).
• Acids should never be used as sanitisers because they may damage equipment and are not regulated for microbial kill.

Abrasive cleaners

• Powders or pads that scrub off stubborn deposits on pots, pans, and bakeware.
• After abrasion, surfaces must be cleaned with detergent and then sanitised to restore hygienic condition.

What this means: sanitisers are not part of this list — they are a separate, specific category applied after these cleaning agents have done their job.

What are the 4 C’s of kitchen hygiene?

Cleaning

• Includes both washing with detergent and sanitising food contact surfaces. In the “Clean” C, the final step is always sanitising (USDA FSIS (food safety regulator)).

Cooking

• Cooking food to the correct internal temperature kills pathogens. Sanitising the surfaces where food is prepared before cooking prevents initial contamination.

Chilling

• Refrigeration at 40°F (4°C) or below slows bacterial growth. Sanitising shelves and drawers regularly prevents cross-contamination from spills.

Cross-contamination

• Using separate cutting boards for raw meat and produce, and sanitising them between uses, is the core defence (UMN Extension (food safety)).

The pattern: sanitising sits inside the “Clean” C but reinforces all four — a properly sanitised kitchen is a safer kitchen from prep to serving.

What is the best way to sanitize dishes?

Heat sanitising (water temperature minimum 77°C)

• Hot water at 77°C (170°F) for at least 30 seconds kills most vegetative bacteria — no chemicals required (CDC (public health authority)).
• Method: immerse cleaned dishes in hot water or run through a commercial dishwasher with a final rinse at that temperature.

Chemical sanitising (chlorine 50-200 ppm, quat 200 ppm)

• Chlorine: 50-200 ppm, contact time 10-30 seconds, water temperature 55-75°F (13-24°C) (Clatsop County, Oregon health code guidance).
• Quats: 200-400 ppm, 30-second contact, stable up to 100°F (38°C).
• Test strips are essential to verify concentration before each use.

Approved methods for home and commercial kitchens

• Home kitchens can use EPA-approved food grade sanitisers (look for “food contact surface safe” on label).
• For cutting boards and countertops, a spray bottle of 1 tablespoon chlorine bleach per gallon of water (approx 50 ppm) works — but must be freshly mixed daily (USDA Agricultural Marketing Service (regulator)).
• Commercial kitchens must follow the jurisdiction-specific concentration and contact time tables.

The trade-off: heat sanitising leaves no chemical residue but uses energy; chemical sanitising is fast and cheap but requires careful testing to avoid under- or over-concentration.

“Food contact surfaces must be sanitised after cleaning to reduce microorganisms to safe levels. It is not enough to simply wipe them clean.”
NSW Food Authority (government regulator)

“Sanitising is a necessary step to prevent foodborne illness. Even a well-washed board can harbour enough bacteria to make someone sick.”
DoFoodSafely – Victoria Health (public health authority)

“Concentration is critical: too low and the sanitiser won’t kill bacteria; too high and it may leave unsafe residues on food contact surfaces.”
University of Minnesota Extension (food safety authority)

Summary

Food grade sanitisers are not an optional extra in the kitchen — they are the difference between a surface that looks clean and one that is microbiologically safe. For anyone running a commercial kitchen or a serious home cook, the choice is clear: test your concentration daily, respect the contact time, and never sanitise before you’ve cleaned. Restaurants and home cooks who skip the sanitiser step are betting other people’s health on a rinse.

Frequently asked questions