Overview
Difucosyllactose (DFL) is a fucosylated human milk oligosaccharide (HMO) comprising lactose with two fucose residues. It constitutes approximately 3-5% of total HMOs in breast milk and is increasingly replicated synthetically for commercial use. As a bifidogenic compound, DFL selectively promotes beneficial gut bacteria in infants, contributing to immune system development and pathogen inhibition. Structurally, DFL belongs to the trisaccharide class with α1-2 and α1-3/4 fucosyl linkages. Its unique configuration enables specific interactions with gut microbiota and epithelial cells. While naturally occurring in human milk, industrial-scale production involves enzymatic synthesis using fucosyltransferases, with purity levels critical for functional efficacy in applications.
Physical and Chemical Properties
DFL exhibits high stability under pasteurization conditions (up to 100°C) and acidic environments (pH 2-7), making it suitable for incorporation into sterilized infant formulas. The compound's water solubility (>50 g/100 mL at 25°C) facilitates homogeneous distribution in liquid formulations, while its low hygroscopicity ensures powder stability during storage. Spectroscopic characterization typically includes HPLC-ELSD for quantification and NMR for structural confirmation. The molecule shows optical rotation [α]D20 +30° to +40° (c=1 in water). Unlike simpler carbohydrates, DFL resists hydrolysis by human digestive enzymes, allowing it to reach the colon intact where it exerts prebiotic effects through microbial fermentation.
Main Applications
The primary use of DFL is in advanced infant nutrition products, where it replicates the functional benefits of breast milk oligosaccharides. Clinical studies demonstrate its role in reducing enteric infections and supporting cognitive development. Pharmaceutical applications include adjunct therapy for inflammatory bowel diseases and as a carrier molecule in targeted drug delivery systems. In the food industry, DFL serves as a bioactive ingredient in functional foods for all age groups, particularly in gut health supplements. Emerging research explores its potential in veterinary nutrition and as an anti-adhesive agent against pathogenic bacteria. Commercial formulations often combine DFL with other HMOs like 2′-FL and LNnT for synergistic effects.
Safety and Storage
DFL has obtained GRAS status in major markets including the EU (EFSA) and US (FDA) when used in infant formula at appropriate concentrations (<3% w/w). Toxicological assessments show no adverse effects at anticipated exposure levels. Occupational handling requires standard powder precautions to prevent respiratory irritation. Long-term stability testing indicates 24-month shelf life when stored in original packaging below 25°C and <60% relative humidity. Opened containers should be flushed with inert gas (nitrogen/argon) to prevent moisture absorption. For laboratory use, aliquoting into smaller vials minimizes repeated exposure to ambient conditions that could affect purity.
B2B Procurement Guide
Bulk procurement of DFL requires verification of third-party certificates including ISO 22000, FSSC 22000, or NSF-GMP. Key specifications to evaluate include: oligosaccharide purity (≥95%), residual solvents (<50 ppm), heavy metals (<0.5 ppm), and microbial limits (TAMC <100 CFU/g). Leading manufacturers offer custom glycosylation profiles and private-label formulation services. MOQs typically start at 5kg for pharmaceutical-grade material, with lead times of 8-12 weeks due to complex synthesis processes. Logistics should maintain cold chain (2-8°C) for international shipments. Sample testing through HPLC-MS is recommended before large-scale purchases to confirm structural integrity and absence of process contaminants.
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