Overview
Melibiose is a naturally occurring disaccharide composed of galactose and glucose linked by an α(1→6) glycosidic bond. It is commonly found in plant exudates, such as honeydew from aphids, and is produced during the fermentation of certain yeasts and bacteria. Unlike sucrose, melibiose is a non-reducing sugar, which gives it unique stability in various industrial processes. In nature, melibiose serves as an energy source for specific microorganisms and plays a role in plant-microbe interactions. Its synthetic counterpart is used in laboratories and industries for research and production purposes, particularly in food and pharmaceutical applications.
Physical and Chemical Properties
Melibiose appears as a white crystalline powder with a sweet taste, though less sweet than sucrose. It has a molecular weight of 342.30 g/mol and a melting point range of 180-185°C, where it decomposes rather than melts cleanly. The compound is highly soluble in water but only slightly soluble in ethanol, making it suitable for aqueous formulations. Chemically, melibiose is stable under normal conditions but can be hydrolyzed into its monosaccharide components (galactose and glucose) by acidic conditions or specific enzymes like α-galactosidase. This property is exploited in various industrial processes, such as the production of prebiotics and specialty sweeteners.
Main Applications
In the food industry, melibiose is used as a mild sweetener and texturizing agent, particularly in products requiring low sweetness intensity. It serves as a substrate in the production of functional oligosaccharides, which are valued as prebiotics for their ability to promote beneficial gut bacteria. The pharmaceutical industry utilizes melibiose as an excipient in tablet formulations and as a stabilizer for certain protein-based drugs. In research, it is employed as a standard in carbohydrate analysis and as a tool for studying enzyme kinetics, particularly those involving α-galactosidases.
Safety and Storage
Melibiose is generally recognized as safe (GRAS) for consumption by major food safety authorities. It does not pose significant toxicity risks through ingestion, though excessive consumption may cause mild gastrointestinal discomfort due to its incomplete absorption in the small intestine. For storage, melibiose should be kept in a cool, dry environment (15-25°C) in tightly sealed containers to prevent moisture absorption and microbial growth. Bulk storage areas should have proper ventilation and be protected from direct sunlight to maintain product stability over extended periods.
B2B Procurement Guide
When procuring melibiose commercially, buyers should clearly specify required purity levels (typically 95-99%), packaging formats (bags, drums, or bulk), and any necessary certifications (e.g., food-grade, pharmaceutical-grade). Lead times may vary depending on supplier inventory, with specialty grades potentially requiring longer production schedules. Quality assurance documents, including certificates of analysis (CoA) and material safety data sheets (MSDS), should be requested for each batch. For large-scale purchases, consider establishing long-term supply agreements to ensure price stability and consistent quality. Technical support for application-specific questions is often available from reputable suppliers.
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