Kojibiose: Rare Sugar with Prebiotic Properties
Kojibiose is a naturally occurring disaccharide composed of two glucose molecules. Found in fermented foods, it has interesting nutritional and prebiotic properties with a low glycemic impact.
Things worth knowing about "Kojibiose"
Kojibiose is a naturally occurring disaccharide composed of two glucose molecules. Found in fermented foods, it has interesting nutritional and prebiotic properties with a low glycemic impact.
What Is Kojibiose?
Kojibiose is a disaccharide consisting of two glucose units linked by an alpha-1,2-glycosidic bond. It belongs to the group of rare sugars and occurs naturally in relatively small amounts. Chemically, kojibiose is designated as 2-O-alpha-D-glucopyranosyl-D-glucose.
Natural Sources and Occurrence
Kojibiose is naturally produced during fermentation by the mold Aspergillus oryzae, which is traditionally used in the production of koji-based products such as miso, sake, and soy sauce. It also forms as a byproduct during the enzymatic hydrolysis of starch, and trace amounts can be detected in certain types of honey.
Chemical Properties and Structure
Kojibiose differs from the better-known disaccharide maltose in the type of glycosidic bond it contains. While maltose has an alpha-1,4 linkage, kojibiose features an alpha-1,2 linkage. This structural difference significantly influences how the sugar is digested and metabolized in the human body.
Biological Effects and Prebiotic Potential
Kojibiose is only slowly or minimally digested in the human small intestine, as the enzyme kojibiase (alpha-1,2-glucosidase) is present at comparatively low levels in humans. As a result, a portion of kojibiose reaches the large intestine intact, where it can be fermented by certain gut bacteria. This mechanism makes kojibiose a potential prebiotic:
- Stimulation of the growth of beneficial gut bacteria such as Bifidobacterium and Lactobacillus strains
- Potential positive influence on the composition of the gut microbiome
- Reduced glycemic response compared to regular glucose or sucrose
Nutritional Significance
Due to its slow digestibility and lower glycemic index compared to common sugars, kojibiose is discussed as potentially beneficial for individuals with insulin resistance or type 2 diabetes. It may also be used as a reduced-calorie sugar alternative in functional foods. The sweetness of kojibiose is lower than that of sucrose.
Safety and Tolerability
Kojibiose is generally considered well tolerated. However, as with other poorly digestible carbohydrates, higher intakes may cause gastrointestinal discomfort such as bloating or a feeling of fullness. People with existing bowel conditions should exercise caution when consuming larger amounts of fermentable carbohydrates. No serious adverse effects or toxicity risks associated with kojibiose have been reported to date.
Applications in the Food Industry
Kojibiose is attracting growing interest as a functional food ingredient in the food and nutrition industry. Potential areas of application include:
- Functional beverages and dietary supplements to support gut health
- Sugar-reduced food products with prebiotic effects
- Research into low-glycemic sweeteners
References
- Sigma-Aldrich / Merck: Kojibiose - Product Data Sheet and Chemical Characterization. Available at: www.sigmaaldrich.com
- Tokuda, M. et al. (2016): Physiological effects of rare sugars. Journal of Nutritional Science and Vitaminology, 62(1), 1-8. PubMed PMID: 27108163
- Morita, T. et al. (2011): Prebiotic potential of rare sugars including kojibiose. Food Chemistry, 128(3), 617-623.
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