What Is E422? Food Additives and the E Number System Explained

The consumer who sees E422 on a label and reaches for a search engine, and the food manufacturer who buys the same substance by the IBC, are chasing the same question: what does this number actually mean? An E number is not a warning sign but an identity number — it shows that a substance has been assessed and placed on the approved food-additive list. Behind E422 sits glycerin, a material that has been on kitchen, pharmacy and cosmetic shelves for decades. This guide explains how the E number system is read, what E422 does in food, and which documents have to be on the table when you buy an additive in food grade — written from the perspective of a wholesale raw-material supplier.

What Is an E Number? The System Behind the Code

An E number is a standard identity code showing that a substance has been assessed and admitted to the approved food-additive list. The leading letter points to Europe: the system took shape in European legislation, was consolidated under EU Regulation (EC) No 1333/2008, and has been adopted by many national food codes, Türkiye's included. In Türkiye, additive use is governed by the Turkish Food Codex Food Additives Regulation, which uses the same numbering. At the international level, the Codex Alimentarius numbering system (INS) mirrors the same codes without the "E" prefix.

The system does two practical jobs:

• A language-independent shorthand: writing E422 instead of "propane-1,2,3-triol" carries the same information into every market.
• Traceability by function: the number roughly indicates the functional class under which the substance was approved, which is what inspectors and formulation reviewers work from.

A substance does not acquire an E number automatically. It is placed on the list after scientific assessment — in the EU, following an opinion from EFSA; internationally, through the JECFA evaluations that feed Codex — and the food categories and maximum use levels permitted for it are defined separately. In other words, an E number does not mean "unrestricted"; it means "permitted under defined conditions".

What Do the Number Ranges Tell You?

The leading digits give away the functional group. The table below pairs each range with an example that actually exists in the Yüksek Kimya catalogue:

E range	Primary functional group	Example from our catalogue
E100–E199	Colours	E170 Calcium Carbonate
E200–E299	Preservatives (and some acidity regulators)	E211, E202, E223, E250, E260
E300–E399	Antioxidants and acidity regulators	E331 Sodium Citrate, E338 Phosphoric Acid
E400–E499	Thickeners, stabilisers, emulsifiers, humectants	E422 Glycerin
E500–E599	Acidity regulators and anticaking agents	E500 Sodium Bicarbonate
E600–E699	Flavour enhancers	—
E900–E999	Sweeteners, glazing agents, antifoams	—

These ranges should not be read as hard walls. A substance can perform more than one function and is named on the label according to its actual role in that product. Acetic acid (E260) is both an acidity regulator and a preservative; calcium carbonate (E170) is numbered among the colours but in practice also works as an anticaking agent and a mineral source. The number describes the substance's place in the system, not the full range of what it does.

An Honest Frame for the "E Number Means Harmful" Shortcut

The most entrenched consumer shortcut reads an E number straight across as "artificial and risky". That shortcut has no chemical basis and collapses against a few concrete examples: vitamin C (ascorbic acid) is E300; calcium carbonate (E170) is limestone; E422 is glycerin derived from vegetable oils. The code says nothing about whether a substance is natural or synthetic — only what its identity is on the additive list.

Swinging to the opposite extreme and declaring that "anything with an E number is harmless" is equally wrong. The accurate frame is this:

1. Listing is the outcome of an assessment, not a declaration of free use.
2. Permitted food categories and maximum use levels are defined separately for every additive; unlimited use does not exist.
3. Not every batch carrying that E number is fit for food. The same molecule is also traded in technical grade, and the real exposure is not the substance itself but the wrong grade entering a food recipe.

That third point is the problem we meet most often in the field as a raw-material supplier — and it is what the rest of this guide is about.

What Is E422? Glycerin (Glycerol) and Its Role in Food

E422 is the food-additive code for glycerin (glycerol), identified in chemical terms by CAS 56-81-5. It is a colourless, odourless, syrup-viscous and markedly hygroscopic liquid: it draws moisture from the air and from the matrix it sits in. Almost every one of its food functions derives from that single property.

Four Core Functions of E422 in Food

• Humectant: it holds water in the product and delays drying and hardening. Protein bars, soft confectionery, cake and pastry fillings and dried-fruit coatings are typical cases.
• Solvent and carrier: it dissolves flavours, colours and botanical extracts, and serves as an alternative carrier to alcohol in flavour concentrates and extraction processes.
• Body and mouthfeel: it raises viscosity and lends body, which matters particularly in reduced-fat formulations.
• Sweetness contribution: it is perceived at roughly half the sweetness of sucrose. It is not positioned as a sweetener in its own right, but it quietly shapes the taste profile.

Glycerin's use map beyond food is considerably wider; we covered the cosmetic, pharmaceutical and industrial sides in our guide on what glycerin is. The focus here is on what changes in the supply conditions when the same material enters a plant under its E422 identity.

Are Glycerin and Glycerol the Same Thing?

Yes. Glycerol is the chemical name (propane-1,2,3-triol). Glycerin is the established commercial name and usually describes the traded product adjusted to a specific concentration with water — 99.5% glycerin means glycerol with a trace of water in it. Which name appears on a label varies by country and product; the substance does not change.

The practical consequence: seeing "glycerol" on one specification and "glycerin" on another quotation does not mean two different materials are being offered. The comparison has to be made not on the name but on the purity percentage, the monograph (USP/EP) and the lot-specific COA.

Vegetable or Animal Origin? Where the Halal and Vegan Question Comes From

Glycerin is a by-product of the splitting of fats (triglycerides). The source can come from three main routes:

• Vegetable oils — palm, coconut, rapeseed or soy derived. Large volumes emerge as a by-product of soap and biodiesel production.
• Animal fats — the classic tallow-based production route.
• Petrochemical synthesis — synthesised from propylene; today a relatively small share.

The molecule produced by all three routes is the same; the difference is in the origin, not in the chemistry. That is precisely why halal, kosher and vegan requirements surface here: the E number says nothing about origin. Only the supplier's declaration and the traceability of the chain do.

So a buyer with a vegetable-origin requirement has one clear job: state the requirement in writing at the order stage and see the origin declaration in the documentation for the delivered batch. Answering the question after the fact is usually harder than rejecting the batch would have been.

Food Grade (USP/EP) vs Technical Grade

With glycerin, the grade distinction carries far more weight than the price difference:

• Food and pharma grade: normally defined against the USP or EP monograph. The typical expectation is 99.5% minimum purity, tight water/ash/heavy-metal limits, colour and odour criteria, and specific tests for impurities.
• Technical grade: sold across a wider purity band (mostly 95–99%) with looser limits. It is adequate for non-cosmetic industrial uses, antifreeze formulations and certain process applications.

The two grades do not carry the same shelf label and they do not carry the same paperwork. This logic is not unique to glycerin; the same split runs through the glycols, and our guide on the difference between MEG and MPG explains why grade is a compliance question before it is a cost question. For food-grade glycerin requirements you can review the specifications on our glycerin (glycerol) product page.

Food-Related Materials in Our Catalogue and Their E Numbers

The table below gathers the materials in the Yüksek Kimya catalogue that carry a food-additive E number. It is built for purchasing teams who want to see at a glance which raw material is known by which identity on the food side:

E number	Substance	CAS	Typical food function
E422	Glycerin (Glycerol)	56-81-5	Humectant, solvent, body
E211	Sodium Benzoate	532-32-1	Preservative (acidic products)
E202	Potassium Sorbate	24634-61-5	Preservative (mould and yeast)
E250	Sodium Nitrite	7632-00-0	Curing and preservation in meat products
E331	Sodium Citrate	68-04-2	Acidity regulator, emulsifying salt
E500	Sodium Bicarbonate	144-55-8	Raising agent, acidity regulator
E223	Sodium Metabisulfite	7681-57-4	Antioxidant and preservative
E170	Calcium Carbonate	471-34-1	Colour, anticaking agent
E338	Phosphoric Acid	7664-38-2	Acidity regulator (cola beverages)
E260	Acetic Acid	64-19-7	Acidity regulator, preservative

A critical note: a substance having an E number does not mean every batch you buy is automatically food grade. Every material above is also traded in technical grade. The grade must be stated explicitly on the order and verified against the COA of the delivered batch. You can review the full catalogue on our products page.

A Short Warning on E223 and Sulphite Declaration

Sodium metabisulfite (E223) is used in food as an antioxidant and preservative — but sulphites are an allergen group requiring declaration. That feeds straight into the formulation decision: above a defined threshold, products containing sulphites trigger a labelling obligation. For that reason an E223 purchase has to be assessed not only on purity but on expected residual level and the labelling consequences together.

Curing Salt Is Not the Same Product as Sodium Nitrite

Nitrite curing salt is the common name for a ready-made curing blend in which a low proportion of sodium nitrite (E250) is mixed into table salt (sodium chloride). Pure sodium nitrite is the raw material for that blend — the two are not the same product and are not interchangeable.

The distinction matters, because nitrite is among the most tightly controlled items in food-additive legislation; neither the blend ratio nor the use level is a free parameter. We supply sodium nitrite as a raw material; the blend ratio and the use level are decisions your food technologist must make against your product type and the current regulation. A current MSDS accompanies every shipment for safe handling of the raw material.

Choosing a Preservative: E211 or E202?

The second most common question on the food side is preservative selection, and the answer comes down to one parameter: your product's pH.

• Sodium benzoate (E211) works strongly only at low pH, in practice below pH 4.5, and leads on the yeast and bacteria side. It is the classic choice for acidic soft drinks, fruit juices and pickled or brined products.
• Potassium sorbate (E202) retains activity across a wider range up to pH 6 and is superior against moulds and yeasts. It is the first preservative that comes to mind for cheese surfaces, bakery goods and jam.

Using the two together is common practice: the spectra complement each other and the total preservative load can be kept below legal limits. We compared this pair's pH window, microbial spectrum and packaging options in depth in a separate article — if you are at the preservative-selection stage, our sodium benzoate vs potassium sorbate comparison is the natural continuation of this guide.

The Document Chain in Food-Grade Supply

In food-grade raw-material purchasing, quality is verified on paper, not by eye. A white powder or a clear liquid proves nothing. The chain below has to be complete if a food manufacturer is going to stand behind it in an audit.

1. Lot-Specific Food-Grade COA

The COA (Certificate of Analysis) is the shipment's identity and must be lot specific — there is no such thing as a "general COA". What to look for on it: purity (assay), moisture/loss on drying, ash, heavy-metal limits, appearance and, where applicable, a declaration of conformity to the monograph (USP/EP). The lot number on the COA must match exactly the lot number on the packaging you receive.

2. Specification and Technical Data Sheet

A COA describes a single batch; the specification commits to the ranges within which the product will be delivered on an ongoing basis. Asking for both when starting with a new supplier shortens the argument when the second batch arrives different.

3. Allergen and GMO Declarations

A food manufacturer's labelling responsibility begins with the raw-material declaration. An allergen declaration (covering sulphites, soy, gluten and so on) and a GMO declaration are file requirements rather than negotiating points, especially for exporters. For glycerin specifically, the vegetable-origin declaration also belongs under this heading.

4. Halal and Kosher Certification

These do not arrive as standard unless requested, and they are difficult to obtain retroactively. If your target market requires them, the quotation stage is the right moment to ask.

5. Traceability and Lot Tracking

In a food recall scenario the first question asked is: which raw-material lot was this batch produced from? That means linking the incoming lot number to your own production record, and on the supplier side it means lot-level traceability held in warehouse records. If one link is missing, there is no chain.

6. Food-Contact Packaging

Delivering a food-grade material in a container that is not fit for food contact cancels out the grade advantage. The packaging must therefore be declared suitable for food contact, and its integrity (seal, closure, inner liner) must be checked on delivery. We collected the cost and handling consequences of choosing between drums, IBCs, bags and big-bags in our guide on wholesale chemical packaging options.

7. Current MSDS and Labelling

Being food grade does not remove the occupational-safety dimension. For corrosive materials such as phosphoric acid and acetic acid, the MSDS and the GHS label are vital on the production floor; how to read the pictograms and H/P statements is covered in our GHS/CLP labelling guide. The documentation side as a whole — including the legal framework for safety data sheets and registration obligations — sits in our KKDIK, REACH and MSDS guide.

Technical Grade Is Not Bought for Food Because It Is Cheaper

Let the one blunt sentence in this guide be this: being the same molecule does not make it the same product. Slipping a technical-grade material into a food recipe looks like a small win on unit cost in the short term. When documentation is requested in an inspection or a customer audit, the price of the resulting compliance gap — batch hold, recall exposure, lost customer — is many times the price step between grades. Grade is not a cost line. It is a risk decision.

On Dosage: Why There Is No Recipe Here

No use level has been given for any substance in this guide, deliberately. The reason is simple: dose is a property of the product, not of the substance. The correct level for the same preservative shifts with the product's pH, water activity, target shelf life, thermal process, packaging and microbial risk profile. On top of that, maximum permitted levels are defined separately per food category.

The right route is:

1. Confirm the permitted additives and maximum levels for your food category against the current applicable regulation — the Turkish Food Codex Food Additives Regulation in Türkiye, EU Regulation 1333/2008 for the European market, or the corresponding framework of your destination market.
2. Validate the dose through your own product validation work.
3. Take the decision together with your food technologist or quality manager.

We are a raw-material supplier: we document the grade and the measured analysis values of the lot we ship with a COA, and pass on the declarations you ask for together with their paperwork. The recipe is written by the party who knows the product.

Three Mistakes We See Most Often in Purchasing

• Not writing the grade on the order. Typing "glycerin" and moving on creates the risk of taking delivery of technical grade. The correct form is an explicit definition such as "food grade, USP, 99.5% min".
• Asking for the COA after delivery. Seeing the document before the order means a non-conforming batch never leaves the warehouse. That habit also heads the list of criteria we apply when choosing a supplier ourselves; the full list is in our guide on choosing a chemical supplier.
• Confusing similarly named materials. Soda ash (sodium carbonate) and sodium bicarbonate (E500) are different substances with different functions; we set out the distinction in our article on soda ash and sodium carbonate.

Wholesale Food-Grade Additive Supply

Yüksek Kimya is a wholesale chemical raw-material supplier based in Kestel, Bursa — not a manufacturer, but the supply link that matches the right grade to the right documentation. On food-related items our way of working is straightforward:

• A COA sample appropriate to the grade and a current MSDS are shared before the order.
• Lot-level traceability is held in our warehouse records.
• On request we pass on origin, allergen and GMO declarations; halal/kosher certification belongs to the manufacturer, so where it exists we request it from them and forward it to you.
• Our quality system is audited under ISO 9001, ISO 14001 and ISO 45001 together with GHP certification; the full set is on our quality and certificates page.
• For items in the dangerous-goods class, shipment is planned with ADR-compliant vehicles.

To request a quote: send us the substance and E number you need, the grade (food/technical), the monograph you are looking for (USP/EP), your monthly or one-time volume and your packaging preference via our contact page. We will come back to you as quickly as we can with a COA sample appropriate to the grade and a current price.

Related reading

• Sodium Benzoate and Potassium Sorbate: Preservative Uses and Differences
• What Is Glycerin (Glycerol)? Uses in Cosmetics, Food and Industry
• KKDIK, REACH and MSDS: A Chemical Regulation Guide
• Choosing a Chemical Supplier: 10 Criteria for Picking the Right Partner