Preservatives used in food processing are substances designed to prevent spoilage and extend shelf life. Their primary function is to inhibit or delay the growth of residual bacteria or microorganisms in food. Notably, preservatives are not equivalent to sterilizing agents (e.g., disinfectants) and cannot kill or eliminate microbes entirely. Therefore, their effective application typically requires combined measures such as sterilization, sealing, or oxygen exclusion to achieve optimal preservation.
To maximize preservative efficacy, professionals must consider:
Compatibility: Whether the preservative is suitable for the specific food product.
Food Matrix: How the food’s physical state (e.g., liquid, solid) affects preservative dispersion and performance.
pH Sensitivity: The acidity/alkalinity of the food, which influences preservative solubility and antimicrobial activity.
Categories of Food Preservatives
Preservatives are classified into:
Organic acids and their salts (most widely used, e.g., sorbic acid, benzoates)
Esters (e.g., parabens)
Amines
Aldehydes
Biological agents (e.g., natamycin, bacteriocins)
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![Ethoxyquin]()
EthoxyquinLight yellow to amber viscous liquid, which gradually turns dark brown after long-term storage in light and air, but does not affect its antioxidant effect. It has a boiling point of 134 ~ 136 ℃read more -
![Sodium Dehydroacetate]()
Sodium Dehydroacetate(calculated by dehydroacetic acid) the use standard of sodium dehydroacetate is the same as that of dehydroacetic acid.. Sodium dehydroacetate has a wide range of antibacterial effects on variousread more -
![Dehydroacetic Acid]()
Dehydroacetic AcidColorless to white acicular or tabular crystal or white crystalline powder. Slightly sour and odorless. Melting point 108 ~ 111 ℃ (sublimation), boiling point 269.9 ℃. It is easy to dissolve in theread more -
![Sodium Diacetate]()
Sodium DiacetateAs a food preservative, sodium diacetate can be used as dried bean, dried bean reprocess, puffed food, raw grain and cooked aquatic products (which can be eaten directly), and its maximum dosage isread more -
![Potassium Sorbate]()
Potassium SorbateColorless to light yellow powder with a slight odor. It is easy to oxidize and darken in the air. Hygroscopic, soluble in water, 59G / 100ml (water); 6.7g/100ml (95% ethanol). 1% aqueous solution pHread more -
![Sorbic Acid]()
Sorbic AcidSorbic acid can be used as food preservative in cooked meat products and prefabricated aquatic products (semi-finished products), with the maximum dosage of 0.075g/kg; The maximum dosage in wine isread more -
![Nisin]()
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![Natamycin]()
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![Diphenyl Oxide]()
Diphenyl OxideAs a food preservative, diphenyl oxide can be used in surface-treated fresh fruits (Citrus only), with a maximum use limit of 3.0g/kg (residue ≤ 12 mg/kg)read more -
![Cinnamaldehyde]()
CinnamaldehydeCinnamaldehyde has a strong smell of cinnamon oil and light yellow oily liquid. The relative density is 1.0497. Boiling point 248 ℃, melting point - 8 ℃. Slightly soluble in water (0.143g / 100ml),read more -
![Ethyl-p-hydroxybenzoate]()
Ethyl-p-hydroxybenzoateColorless, fine crystal or crystalline powder, almost odorless, slightly astringent, stable to light and heat, no hygroscopicity, melting point 115 ~ 118 ℃. Insoluble in water (0.001g/100ml), solubleread more -
![Propyl-p-hydroxybenzoate]()
Propyl-p-hydroxybenzoate(calculated by p-hydroxybenzoic acid) the use standard of propyl p-hydroxybenzoate is the same as that of ethyl p-hydroxybenzoate.Due to the low water solubility of p-hydroxybenzoates, they areread more
A preservative is a substance or a chemical that is added to products such as food products, beverages, pharmaceutical drugs, paints, biological samples, cosmetics, wood, and many other products to prevent decomposition by microbial growth or by undesirable chemical changes. In general, preservation is implemented in two modes, chemical and physical. Chemical preservation entails adding chemical compounds to the product. Physical preservation entails processes such as refrigeration or drying.Preservative food additives reduce the risk of foodborne infections, decrease microbial spoilage, and preserve fresh attributes and nutritional quality. Some physical techniques for food preservation include dehydration, UV-C radiation, freeze-drying, and refrigeration. Chemical preservation and physical preservation techniques are sometimes combined.
Firstly, these preservatives act as a barrier against the growth of bacteria. Hence, the composition of food items does not change and can be consumed without worrying about microbes, bacteria, etc.
Not all preservatives are chemically made; there are also natural preservatives that are non-harmful such as sugar and salt. Such natural preservatives avoid the decomposition of food items.
Preservatives are heavily used in mass production like wheat, paddy, or other crops that are grown and stored in bulk. To avoid their decomposition, preservatives are added to serve billions of people.
Artificial preservatives act as antioxidants and make food acidic, reducing the moisture level in food items, and thereby slowing down the ripening process.
Preservatives assist in the reduction of food waste by extending the shelf life of food that would otherwise spoil before it is used.
As the process of ripening is slowed down using preservatives, that means your trips to grocery stores would also be limited.
Preservatives are added to meats to remove all their toxins and make them safer for consumption.
Another added advantage is that preservatives added to food make them visually attractive. For example, sodium nitrates and nitrites are used to preserve the color of meat; the white color of flour is preserved through bleaching.
Salt is a natural preservative and enemy of all bacteria; any microorganism drawn to food will be unable to thrive in the presence of salt.
Types of Preservatives
Potassium Sorbate
With high safety, it is widely used in jams, pastries, alcoholic beverages, cheese, and other foods. It can effectively inhibit the growth of microorganisms in food and extend the shelf life of food.
Sodium Benzoate
It belongs to acidic preservatives, and can play a better inhibiting role when the pH range is between 2.5-4.0. It is often used in the preservation of various acidic foods.
Sodium Propionate
It is suitable for use in foods such as pastries, bread, and soy products. In an acidic environment, it has a strong inhibition effect on yeast, molds, etc., and can effectively extend the shelf life of these foods.
Lactobacillus Peptide
Completely non-toxic and very stable, with good heat and acid resistance. It can be widely used in dairy products, meat products, convenience foods, and other foods, playing a good role in preservation.
Natamycin
It is mainly used in dairy products, meat products, and other foods to prevent the growth of molds and avoid food spoilage, to keep the food fresh and safe.
How Preservatives Work
Preservatives and preservation techniques prevent foods from spoiling and oxidizing quickly, allowing grocery manufacturers to distribute foods across the country and the globe without impacting food safety or quality. Two significant factors that cause foods to go bad quickly are microbes and oxidation.
Microbes that cause spoiling are undesirable bacteria, fungi, and yeasts that can grow in our food products. These microorganisms feed off the foods’ nutrients and can cause serious harm to humans if consumed. Without preservatives, bacteria such as listeria and botulism can invade our foods and if consumed by humans, can cause us to become critically ill. Less harmful bacteria, fungi, and yeasts will grow on foods making them inedible.
Oxidation, which is a term for certain types of chemical reactions, can impact food safety and flavor by cause an undesirable chemical change that can turn fats rancid and can cause vegetables and fruits, such as cut potatoes and apples, to brown. Enzymes and other chemical breakdown processes are responsible for the oxidation that transforms foods into an unpalatable, and at times, unsafe product.
Application of Preservatives
Preservatives In Food
Food has a natural expiration process that is the result of bacteria, fungus, and molds taking over the food. By adding preservatives, whether they be natural, artificial, or a combination of both - it prevents these foods from expiring as fast. Preservatives are also used to help keep the food color, shape, smell, and size — which can make the food item more appealing to the consumer.
Preservatives In Medicine And Pharmaceuticals
Preservatives are used in medicine and pharmaceuticals to help prevent microbial contamination. This is most commonly found in over-the-counter medicines such as acetaminophen and cough syrup.
Preservatives In Cosmetics
In makeup and other personal and hygiene products (i.e. shampoo, conditioner, cleansers, etc.), preservatives are used to prevent and slow down bacteria growth and product breakdown. Most of the preservatives in cosmetics are artificial/chemical-based. However, this doesn’t go to say that there aren’t natural preservatives in cosmetics. In fact, there are brands that are dedicated to creating all-natural products that are free of chemicals and artificial preservatives.
Preservatives In Wood
Although it may sound strange, preservatives are often added to wood, and for a good purpose. Doing so prevents the wood from splintering, rotting, and breaking - which is especially important in wooden structures like powerline/telephone poles, fences, and patios.
Market Demand for Preservatives in Feed
The global increasing incidences of animal feed damage caused mostly due to fungal and bacterial contamination is projected to drive the demand for feed preservative in the upcoming years. Moreover, the feed prepared without the addition of preservatives have shown harmful effects in all classes of farm animals owing to the production of mycotoxins by certain species and strains of moulds which are predicted to boost the demand for feed preservatives. Fungal contagion of animal feeds, especially high-moisture cereal grains such as sorghum, wheat, and others can be stopped by the use of preservatives before the storage. For instance, propionic acid has an excellent property to prevent the growth of mold and formic acid is very effective in preventing the growth of bacteria.Besides from preventing animal feed deterioration too rapidly, preservatives will also add a healthy and nutritive dimension for poultry, pigs, and cattle. The various supportive rules and regulations about the uses of feed preservatives are expected to leverage the market of animal feed preservatives positively. For instance, Food and Drug Administration (FDA) of US permitted use of formaldehyde as animal feed additive to preserve fodders, to maintain animal feeds quality and feed ingredients free from bacteria and to control molds within them. Furthermore, the increasing demand for feed preservatives in the preparation of feed premixes owing to its rising popularity among farm animal producers is expected to positively impact the global market of feed preservatives.
How to Use Preservatives
Food preservatives can inhibit the growth and reproduction of microorganisms in food and extend the shelf life of food. This is critical for food storage, transportation, and distribution, reducing food loss and waste while allowing consumers to enjoy fresh food for longer. For example, sodium propionate can prevent mold and inhibit the re-fermentation process in soy sauce, thereby extending its shelf life.
Some food preservatives can prevent browning, deterioration, and hardening of the texture of the food, thus preserving the original flavor and taste of the food. This is especially important for perishable foods such as fruits, vegetables, and meats. For example, ascorbic acid prevents foods from browning, making them look more appealing. Sodium lactate prevents the meat from dehydrating, thus keeping it fresh tasting, and flavorful.
Food preservatives reduce the risk of food poisoning by inhibiting the growth of bacteria, molds, and yeasts in food. This is essential for food safety and consumer health, especially for people who are allergic to specific ingredients or who require high preservation conditions for their food.
With food preservatives, even out-of-season food can be grown in other seasons with the help of preservatives, thus meeting the demand for a variety of ingredients and enriching dietary diversity, thus expanding the sales range of food and increasing the revenue of the food industry.
Some preservatives can not only extend the shelf life of food but also supply extra specific nutritional value to make the food more nutritious. This can provide more diversified nutritional choices for some specific groups of people.
How to Choose the Right Preservatives
Functionality
Define the specific functionality you want the additive to provide. For example, if you need a preservative, consider additives such as citric acid or sodium benzoate. If you want to enhance the texture, consider hydrocolloids like xanthan gum or carrageenan. Understanding your desired outcome will help you narrow down the options.
Safety
Ensure that the selected food additives are approved for use by regulatory authorities such as the Food and Drug Administration (FDA) or the European Food Safety Authority (EFSA). Check for any potential health risks or allergenic properties associated with the additives. Conduct a thorough risk assessment to ensure consumer safety.
Regulatory Compliance
Familiarize yourself with the regulations and guidelines governing food additives in your target market. Different regions may have specific requirements and permitted levels for certain additives. Ensure your chosen additives comply with these regulations to avoid legal issues and maintain consumer trust.
Consumer Preferences
Stay informed about changing consumer preferences and trends. Increasingly, consumers are seeking natural and clean-label products, free from artificial additives. Consider using natural alternatives, organic additives, or additives derived from renewable sources to align with consumer preferences and market demands.
Compatibility And Interaction
Consider the compatibility of the chosen additive with other ingredients in your product formulation. Some additives may interact with certain ingredients, affecting the overall quality or stability of the product. Conduct compatibility tests to ensure the additive integrates well and does not cause adverse effects.
Shelf Life And Stability
Evaluate the impact of the chosen additive on the shelf life and stability of your product. Some additives may extend shelf life, enhance product stability, or prevent spoilage. Consider the storage conditions required for the additive and assess its compatibility with your product’s packaging materials.
Sensory Impact
Assess the sensory impact of the additive on the final product. Consider factors such as taste, texture, color, and aroma. Ensure that the additive enhances the sensory attributes of the product and aligns with your target consumers’ preferences.
Supplier Reliability
Choose reputable and reliable suppliers for your food additives. Consider their track record, quality control measures, and adherence to industry standards. Establish a good working relationship to ensure consistent supply, technical support, and responsiveness to your needs.
Cost-effectiveness
Evaluate the cost-effectiveness of the chosen additive. Consider the dosage required, its availability, and the impact on your production costs. Balance the quality enhancement provided by the additive with the overall profitability of your product line.
FAQ
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