As someone who’s spent the last 12 years working as an oxidant supplier—walking the floors of food processing plants at 5 a.m., troubleshooting why a batch of frozen spinach went brown, and listening to quality control managers stress about extending shelf life without compromising safety—I get the question “Are there any oxidants that are used in the food industry for preservation?” more times a month than I can count. For years, the general public (and even some in food production) has bought into the myth that “oxidants in food = bad.” They associate terms like “oxidizing agents” with harsh, industrial chemicals that do more harm than good. But if you’ve ever had a carton of pasteurized milk that didn’t spoil in three days, or a jar of pickles that stayed crisp for six months, you’ve relied on oxidants quietly working behind the scenes to keep food safe, fresh, and consistent. Let’s cut through the confusion: the oxidants used in food preservation aren’t the same as the ones in lab bottles or pool chemicals. They’re carefully regulated, rigorously tested tools that balance microbial control, color stability, and nutrition—all while meeting strict global food safety standards. Oxidant
First, let’s clarify what an oxidant actually does in a food context, because the term is part of the problem. Oxidation is a natural chemical reaction that happens when oxygen molecules interact with food components: it’s why apples turn brown when cut, why bread goes stale, and why meat gets gray. Oxidants (also called oxidizing agents) work by moderating these reactions and targeting harmful microbes that cause spoilage and foodborne illness. They do this by transferring oxygen or accepting electrons from other substances, disrupting the cellular processes of bacteria, yeasts, and mold before they can make you sick or ruin a product. The key here is that food-grade oxidants are dosed precisely—used in tiny, controlled amounts that are too small to leave dangerous residues, while still delivering maximum benefit.
Take chlorine, for example. It’s the most widely used oxidant in food processing, and it’s been a staple for over a century. I remember my first year in this business, a vegetable processing plant in central California switched from using no chlorine to a dilute chlorine wash for their fresh-cut lettuce. Within six months, their food safety audit scores jumped 20 points, and they reduced product loss from spoilage by 18%. How does it work? Chlorine in water forms hypochlorous acid, which easily penetrates the cell walls of E. coli, Salmonella, and Listeria—three microbes that are top of mind for every produce producer. It’s used not just for produce, but for sanitizing processing equipment, water lines, and even the ice used to transport seafood and poultry. The Environmental Protection Agency (EPA) and the Food and Drug Administration (FDA) set strict limits: for produce washes, chlorine levels rarely exceed 200 parts per million (ppm), and residual chlorine in final products is so low it’s undetectable in taste or nutrition. I’ve supplied chlorine-based sanitizers to poultry processors for years—they use it to chill carcasses, and it cuts microbial counts by 99.9% without changing the flavor of the chicken. It’s cheap, effective, and when used correctly, one of the safest tools we have.
Next, ozone. For a long time, ozone was seen as an industrial pollutant—something that’s bad for air quality in cities. But in the last 15 years, it’s become one of the fastest-growing oxidants in food preservation, and for good reason. Ozone is three oxygen molecules bound together; when it reacts with food or microbes, it breaks down into regular oxygen, leaving no harmful residues. That’s a huge selling point for producers who want to avoid chemical additives. I’ve worked with a berry farm in Oregon that switched from sulfur dioxide (another oxidant, common for dried fruit) to ozone for washing their strawberries. They reported that ozone reduced mold growth on stored berries by 40%, and customers preferred the taste of the berries since there was no residual sulfur aftertaste. Ozone is also used to treat drinking water for food processing facilities, extend the shelf life of fresh juices, and even sanitize packaging materials. It’s highly reactive, so it’s important to generate it on-site (rather than transporting it, which is dangerous) and control levels, but when done right, it’s a game-changer for ready-to-eat foods that don’t want chemical residues.
Another oxidant that might surprise you is hydrogen peroxide. You probably have a bottle of 3% hydrogen peroxide in your first aid kit, but food-grade hydrogen peroxide is much more concentrated and regulated, and it’s used in a wide range of food applications. I supply 35% food-grade hydrogen peroxide to a pasteurized egg producer in the Midwest, who uses it to disinfect eggshells before breaking them for liquid egg products. Hydrogen peroxide works by releasing oxygen that kills bacteria on the shell, and when it’s properly rinsed, it breaks down into water and oxygen—no residues left. It’s also used to bleach flour (to improve its baking performance and color), treat grain and nuts to reduce aflatoxin (a toxic mold), and even as a packaging sterilant for aseptic cartons, like the ones used for almond milk or soup. A few years ago, we had a customer who made organic baby food; they couldn’t use most synthetic preservatives, so they switched to hydrogen peroxide to sterilize their processing lines. They were able to keep their products organic, meet FDA standards, and extend their shelf life from 30 days to 60 days without adding any artificial ingredients.
Wait, but what about the concerns? I know there are people who worry about oxidants causing “free radical damage” in food or in the body. It’s true that high levels of oxidants can be harmful, but in food preservation, we’re talking about parts per million, not parts per thousand. For example, the FDA allows chlorine residues in food up to 10 ppm— that’s less than a single drop of chlorine in 100 gallons of water. When hydrogen peroxide is used as a sterilant, residual levels are required to be below 0.5 ppm, which is negligible. Ozone, when used in water treatment, dissipates within minutes, so there’s no chance of it being present in the final product. The body actually handles small amounts of these compounds easily; in fact, our own cells produce oxidants to fight off infections. The key is that we’re not overusing these chemicals, and they’re approved by global regulatory bodies—FDA, EFSA (European Food Safety Authority), and Codex Alimentarius—after years of safety testing.
One oxidant that’s been around for decades, but is getting a new look lately, is nitrites. Most people associate nitrites with cured meats like bacon and hot dogs, and there’s been a lot of debate about their safety. But nitrites are actually powerful oxidants that play a critical role in preserving cured meats, and when used correctly, they’re one of the safest tools we have. Nitrites kill Clostridium botulinum, the bacteria that causes botulism—a deadly toxin that can grow in vacuum-sealed, low-oxygen foods like canned ham or sausage. Without nitrites, cured meats would be at high risk for botulism. EFSA and FDA set strict limits for nitrite levels in meat products, and modern processing methods ensure that nitrites don’t react with meat components to form harmful nitrosamines (a concern raised in past studies). In fact, I work with several small, artisanal cured meat producers who use controlled amounts of nitrites along with natural antioxidants like vitamin C to prevent any potential issues. They tell me that their customers value the taste and safety of cured meats that don’t spoil in a few days, and nitrites are non-negotiable for meeting food safety standards.
So why am I telling you all this? As an oxidant supplier, my job isn’t to sell chemicals—it’s to help food producers make safe, high-quality food that gets to consumers without spoiling. I’ve seen too many small producers go out of business because they couldn’t extend their shelf life without raising prices or compromising safety. I’ve also seen big brands face recalls because they cut corners on microbial control, endangering thousands of people. Oxidants are the middle ground between those two extremes. They’re not a “set it and forget it” solution—they require testing, precise dosing, and compliance with regulations—but when used correctly, they’re essential.
If you’re a food processor, farmer, or product developer reading this, I want you to know that oxidants aren’t something to fear. They’re tools, like any other piece of processing equipment or preservative. Whether you’re washing fresh produce, pasteurizing dairy, curing meat, or making shelf-stable juices, there’s an oxidant that’s right for your needs. The next time you pick up a carton of milk that’s still good a week after opening, or a bag of frozen berries that taste like they were picked yesterday, take a second to thank the oxidant that made it possible.
If you’re looking to improve your product’s shelf life, reduce food waste, or meet stricter food safety standards, I’m here to help. I work with producers of all sizes, from small artisanal operations to large multinational brands, to find the right oxidant solution for their specific needs. We offer custom formulations, on-site testing, and ongoing support to make sure you’re using oxidants safely and effectively. Don’t hesitate to reach out to discuss your project, ask questions, or request a sample. Together, we can make food that’s safe, fresh, and accessible for everyone.
Agrochemical Raw Material(TC) References
- U.S. Food and Drug Administration. (2023). Food Additive Status List. Retrieved from regulatory databases
- European Food Safety Authority. (2022). Safety assessment of oxidizing agents for use in food processing. EFSA Journal
- Food and Agriculture Organization of the United Nations / World Health Organization (Codex Alimentarius). (2021). Recommended International Code of Practice for the Use of Sanitizing Agents in Food Processing. Codex Stan. 192-1995
- Zhang, Y., et al. (2020). Ozone as a sanitizer for fresh produce: Efficacy and safety. Journal of Food Protection
- Smith, A. B., et al. (2019). Hydrogen peroxide use in food processing: Applications and regulatory considerations. Journal of Food Science and Technology
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