Using Biotransformation to Develop Low-Calorie Sugars and Functional Jujube Foods

A Fruit Juice That Makes Its Own Sweetener

Jujube syrup is a sugar-dense ingredient. This study turns it into something more useful. By applying two enzymes, researchers produced D-allulose directly in concentrated jujube juice. The final concentration reached 110 g/L. That is a meaningful number for formulators looking for fruit-derived sweetness with a lower caloric load.

The paper comes from Food Science & Nutrition (DOI: 10.1002/fsn3.963). It covers both process development and the physiological effects of D-allulose. For B2B buyers, the process side matters most. But the GLP-1 data adds another layer.

Background

Jujube, or red date, contains high levels of glucose and fructose. Those sugars bring sweetness, but they also bring calories. D-allulose is a low-calorie rare sugar. Manufacturing it usually requires enzymatic isomerization of fructose. This study asked a simple question: can you skip the purified fructose and use jujube juice as the feedstock?

The answer is yes.

What the Study Did

The researchers used two enzymes: D-glucose isomerase and D-allulose 3-epimerase. D-glucose isomerase converts glucose into fructose. D-allulose 3-epimerase then converts fructose into D-allulose. Together, they shift the sugar profile of jujube juice toward a low-calorie sweetener.

They worked with concentrated jujube juice, not a synthetic sugar solution. That matters for manufacturers. Real fruit juice carries other compounds, and those can interfere with enzymes. The team optimized reaction conditions to get the conversion to work in that complex matrix.

Key Findings

The numbers are clear. D-allulose accumulated to 110 g/L in concentrated jujube juice. Meanwhile, glucose dropped by 13.4% and fructose dropped by 18.1%. That is a real change, though not a complete sugar replacement.

Parameter	Result
D-allulose concentration	110 g/L
Glucose reduction	13.4%
Fructose reduction	18.1%
Oral D-allulose effect	GLP-1 release, vagal activation, reduced food intake, improved glucose tolerance

The D-allulose effect is worth attention. Oral D-allulose triggered GLP-1 release. It also activated vagal afferent signals. Those signals connect the gut to the brain. In the study, this led to reduced food intake and better glucose tolerance. That means the sweetener may do more than replace sugar. It could contribute to appetite regulation and glycemic control.

What It Means for Manufacturers

This is not a lab curiosity. The enzymatic process works in a real fruit juice system. Formulators can source jujube juice, convert its native sugars, and produce a syrup with D-allulose already present. No separate D-allulose addition step is needed.

There are limits. The reductions in glucose and fructose are modest. The syrup still contains significant sugar. To make a high-intensity sweetener or a zero-calorie claim, you would need further processing or blending. But as a fruit-derived functional sweetening ingredient, it has a strong starting profile.

For B2B buyers, the key question is supply economics. Jujube is a well-established agricultural crop, especially in China. The enzymes are known quantities in the sugar industry. The process fits existing biotransformation workflows. That lowers the barrier for scale-up.

FAQ

Can jujube juice become a direct source of D-allulose? Yes, after enzymatic treatment and concentration. The study reached 110 g/L of D-allulose in the final juice.

How much of the original sugar is actually reduced? Glucose drops by 13.4% and fructose drops by 18.1%. It is a partial conversion, not a complete one.

Does the D-allulose from this process have functional benefits? Oral D-allulose in the study triggered GLP-1 release and vagal afferent activation. That led to reduced food intake and improved glucose tolerance.

Jujube is a familiar ingredient. Now it has a new role. With the right enzymes, it becomes a low-calorie sweetener source with metabolic benefits. For formulators, that is worth testing in your own line.