Safety evaluation of the food enzyme d-allulose 3-epimerase from a genetically modified Corynebacterium glutamicum strain

A clean safety verdict for enzyme-made D-allulose

The enzyme that turns fructose into D-allulose just passed an EFSA safety review. Buyers and formulators now have a published reference point for this production route.

Background

D-allulose is the special carbohydrate that food makers keep asking about. It also goes by another name: D-psicose. The two are synonyms. The enzyme that makes it is d-allulose 3-epimerase. It processes fructose into this special carbohydrate.

Manufacturers produce the enzyme with a genetically modified strain of Corynebacterium glutamicum. That raises the standard question. Is the enzyme safe? EFSA's expert panel took up that question in the paper reviewed here.

What the study did

The panel evaluated the food enzyme as a production aid. The preparation works on fructose to make D-allulose. The review followed EFSA's safety assessment framework.

The panel defined its safety endpoint. That endpoint is the no observed adverse effect level, or NOAEL. The NOAEL landed at 1796 mg TOS per kilogram of body weight per day.

That number deserves attention. It was the highest dose tested in the study. Even at that top dose, test animals showed no adverse effects. The panel fixed the NOAEL at the ceiling. No lower dose had to serve as the reference.

TOS means total organic solids. It is the standard metric EFSA uses to express the dose of an enzyme preparation. TOS captures the non-water, organic fraction of the preparation.

Key findings

Three facts matter most for ingredient buyers. First, the enzyme does its job. It converts fructose into D-allulose. Second, the toxicology picture is clean at the maximum tested dose. Third, the finished sweetener carries no residual enzyme baggage.

Parameter	Finding	What it means
NOAEL	1796 mg TOS/kg bw per day, highest dose tested	No adverse effects seen even at the top dose
TOS in D-allulose	Removed during production	The enzyme does not carry into the final ingredient
Recombinant DNA	Not detected in D-allulose	No genetically modified material remains in the sweetener

That table tells the story. The enzyme is gone before D-allulose reaches your formula. So is the DNA of the production organism.

The removal of TOS matters more than most formulators realize. Toxicity testing uses the concentrated enzyme preparation. Consumers never see that preparation. They eat the finished D-allulose. In that finished product, the enzyme residue is stripped out.

What it means for manufacturers

Suppliers of enzyme-made D-allulose can now cite a defined safety endpoint. That is useful. Regulatory teams need clean numbers. The EFSA opinion delivers one.

Ingredient buyers can also use this in supplier qualification. Ask your supplier if their D-allulose comes from this enzyme route. Check whether they can point to the EFSA opinion. Then confirm their finished product specs for enzyme residue and DNA.

The safety margin logic is simple. The NOAEL comes from a concentrated enzyme preparation. Your product contains none of that preparation. Real-world exposure sits far below the tested endpoint.

This matters for formulation too. A sweetener that clears EFSA with a clean toxicology profile creates fewer hurdles in finished product claims. It simplifies conversations with your own quality and regulatory groups.

One caution. This opinion covers the enzyme and its production route. It does not cover every D-allulose production method on the market. Match the process to the opinion before you rely on it.

FAQ

Is d-allulose 3-epimerase the same as D-psicose 3-epimerase? Yes. The paper lists D-allulose and D-psicose as synonyms. The enzyme name follows the same pattern.

Does final D-allulose contain recombinant DNA? No. The panel found no recombinant DNA in D-allulose produced with this enzyme. The production organism's genetic material is not detected in the finished sweetener.

What does a NOAEL of 1796 mg TOS/kg bw per day mean in plain terms? Test animals received up to 1796 mg of the enzyme preparation's total organic solids per kilogram of body weight each day. They showed no adverse effects at that level. Because it was the highest dose tested, the panel could not push higher. The true safe ceiling may be higher still.

The science on D-allulose keeps maturing. This EFSA opinion gives the industry a concrete safety benchmark. Buyers can file it, cite it, and move forward. That is exactly the kind of clarity a growing sweetener market needs.