Overview
Dextran conjugate is a functionalized derivative of dextran, a natural polysaccharide composed of glucose units. By chemically coupling functional groups (e.g., amines, carboxyls, or fluorescent tags) to its hydroxyl groups, dextran gains tailored properties for specialized applications. Its biocompatibility and solubility make it a versatile platform in biomedical fields. First developed in the mid-20th century, dextran conjugates are now critical in targeted drug delivery systems, where they improve solubility and prolong circulation time. They also serve as carriers for contrast agents in imaging and as matrices in bioseparations.
Physical and Chemical Properties
Dextran conjugates retain the core properties of native dextran, including high water solubility and resistance to enzymatic degradation in humans. Their hydrodynamic volume depends on molecular weight, which ranges from 1kDa for small conjugates to 2,000kDa for larger complexes. Modified groups alter reactivity; for example, amine-conjugated dextran enables covalent bonding with carboxylated molecules. Thermal stability is moderate, with decomposition occurring around 200°C. The conjugates are stable in pH 3–11 but may hydrolyze under strong acidic/alkaline conditions. UV-visible properties vary if fluorescent tags (e.g., FITC) are attached.
Main Applications
In pharmaceuticals, dextran conjugates are used to enhance drug delivery, particularly for anticancer agents and proteins. Their hydrophilic surface reduces immune clearance, while conjugation allows targeted release. For instance, dextran-doxorubicin conjugates improve tumor accumulation. Diagnostics leverage fluorescent or magnetic dextran conjugates as imaging probes. In chromatography, they act as size-exclusion or affinity matrices. Industrial applications include enzyme immobilization and hydrogel fabrication for tissue engineering scaffolds.
Safety and Storage
Dextran conjugates are generally non-toxic and non-immunogenic at standard doses. However, modified versions (e.g., with cytotoxic drugs) require handling per GHS Category 2 guidelines. Use PPE (gloves, goggles) to avoid inhalation or skin contact with powders. Store lyophilized products at 2–8°C in airtight containers; aqueous solutions may require refrigeration and antimicrobial preservatives. Avoid freeze-thaw cycles to prevent aggregation. Shelf life is typically 2–3 years when stored properly.
B2B Procurement Guide
When sourcing dextran conjugates, specify molecular weight (e.g., 40kDa for drug delivery), functionalization type (e.g., COOH for EDC/NHS coupling), and purity (≥95% for critical applications). Bulk orders (100g+) may reduce costs by 20–30%. Reputable suppliers include Sigma-Aldrich, Thermo Fisher, and TCI America. Request certificates of analysis (CoA) for endotoxin levels (<0.1 EU/mg for injectables) and residual solvent data. Lead times vary from 2 weeks (standard products) to 8 weeks (custom modifications).
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