Toxicological Evaluation of D-Allulose Produced by a Novel One-Step Fermentation Process Using Genetically Engineered E. coli AS10

A new toxicology benchmark for allulose

If you are qualifying D-allulose for a food product, you need process-specific safety data. A paper with DOI 10.1155/jt/6597561 provides exactly that. Researchers set the no-observed-adverse-effect level (NOAEL) for D-allulose from a one-step fermentation process at 8,000 mg/kg body weight/day in rats. That number gives formulators and buyers a concrete benchmark.

Allulose and the process question

D-allulose offers physical properties close to sucrose. Solubility, texture, and thermal stability all look similar. That makes it valuable for lower-sugar bakery, beverage, and confectionery systems. But how allulose is made matters. Enzymatic conversion and fermentation can produce the same molecule with different impurity profiles. So when a production route uses a genetically engineered strain, you need evidence that the final ingredient, as produced, is safe.

The study addresses that need directly.

What the study did

Researchers ran a 90-day oral toxicity study in rats. The test material was D-allulose made by a novel one-step fermentation process using engineered E. coli strain AS10. Daily dosing covered a full subchronic period. The goal was to characterize potential toxicological effects from repeated exposure.

Results were clean. At 8,000 mg/kg bw/day, no adverse effects appeared. The study team determined the NOAEL to be 8,000 mg/kg bw/day. That is a strong result for an ingredient intended for regular dietary use.

Key findings at a glance

Parameter	Finding
Test system	Rats, 90-day oral administration
Production method	One-step fermentation with engineered E. coli AS10
NOAEL	8,000 mg/kg body weight/day
Physicochemical properties	Similar to sucrose: solubility, texture, thermal stability

The table condenses the essentials. The physical properties support formulation work. The NOAEL supports safety positioning.

What this means for food manufacturers

You can use this study to strengthen a safety dossier. A defined NOAEL helps toxicologists set acceptable exposure limits. It also helps you compare ingredients from different suppliers.

Ask suppliers whether their D-allulose comes from the same one-step fermentation process. Ask if they can provide the full study report. If they can't, your risk review should reflect that gap.

For formulators, the physicochemical similarity to sucrose is practical. Less reformulation may be needed for texture or thermal behavior. The comparison below reflects that.

Property	D-allulose from AS10 process	Sucrose
Solubility	Similar to sucrose	Reference standard
Texture	Similar to sucrose	Reference standard
Thermal stability	Similar to sucrose	Reference standard

Keep in mind that the study focuses on toxicity and physical properties. You will still need separate sensory testing for sweetness and flavor in your actual product.

FAQ

Why is the 8,000 mg/kg/day NOAEL useful for product development?

It tells you that rats tolerated that dose for 90 days without adverse effects. Food safety reviewers use NOAEL values to set acceptable daily intakes after applying safety factors. It is a reference point, not a direct human recommendation.

Does this study apply to all D-allulose?

No. This study tested D-allulose from a specific process and strain. If your supply chain uses a different enzyme, strain, or purification route, you need comparable process-specific data.

Can I replace sucrose with this D-allulose?

Physically, yes, in terms of solubility, texture, and thermal stability. Those properties are similar to sucrose. But sugar replacement involves sweetness, bulking, and reactivity, so test those in your actual system.

The 8,000 mg/kg/day number is now part of your due diligence. It gives you a documented safety anchor for one specific allulose process. That makes the ingredient easier to evaluate and easier to defend in internal reviews. For a food industry that keeps moving toward lower sugar, that is a useful place to stand.