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Melibiose (CAS 585‑99‑9) is a disaccharide formed by one galactose unit and one glucose unit linked via an α‑1,6 glycosidic bond. It naturally occurs in beans and some plant polysaccharide hydrolysates. Human digestive enzymes cannot break down melibiose, yet certain gut microbiota can ferment it. It is moderately sweet, water‑soluble white crystalline powder. Main uses cover biochemical research as carbohydrate substrate, microbial culture medium component, and reference standard for oligosaccharide analysis. It also appears in small amounts within prebiotic raw‑material mixtures for functional food studies.
Melibiose is an α‑1,6‑linked disaccharide naturally existing in legumes and honey, with mild sweetness around 30‑40 % of sucrose. Human small intestinal enzymes cannot digest it, so it reaches the colon for microbial fermentation. Compared with mass‑produced prebiotics such as stachyose, melibiose remains largely research‑oriented in food rather than a mainstream bulk ingredient, due to high production cost and FODMAP‑related gastrointestinal risk at high doses.
In functional food and dietary supplement sectors, melibiose acts as a candidate prebiotic substrate. It can selectively stimulate the growth of bifidobacteria and lactic acid bacteria, boosting short‑chain‑fatty‑acid production to support gut homeostasis. Formulators blend small doses into synbiotic powder sachets and nutritional formulations. It may enhance bioavailability of plant phenolic compounds, making it attractive for plant‑based nutritional product developmentEMBL-EBI. However, over‑consumption may trigger bloating and flatulence, limiting permitted addition levels in finished food.
In fermented food processing, melibiose serves as a carbon source for screening and selecting food‑grade lactic‑acid‑bacteria strains. Only microbes producing α‑galactosidase can utilise melibiose, which supports strain screening in yoghurt and fermented‑beverage development. It rarely gets directly added into commercial dairy consumer products, mostly applied in laboratory‑scale fermentation trialsPMC.
For confectionery and bakery applications, its decent thermal stability and low‑Maillard‑reaction tendency offer formulation potential. It can partially substitute sucrose to reduce glycemic response, retain moisture and soften texture in biscuits or cereal bars. Still, high raw‑material price restricts large‑scale industrial adoption; most relevant cases stay at lab‑test stage instead of mass production.
Additionally, melibiose functions as an analytical marker. It is measured in honey authenticity testing, helping regulators distinguish genuine honey from adulterated syrup‑blended products. It rarely appears as an intentional added ingredient in mainstream food markets, mostly occurring as natural trace component or enzymatic‑hydrolysis by‑product from raffinose‑family oligosaccharide processing Further cost reduction and safety‑profile data are required for broader commercial food‑grade utilisation.
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