Biotin Solution

Updated: 2026-07-15

Overview

Biotin solution is a ready-to-use liquid formulation of biotin (vitamin B7 or H), a water-soluble vitamin critical for metabolic processes. Prepared by dissolving biotin in solvents like water or DMSO, it is widely used in life science research and diagnostics due to its high binding affinity to avidin and streptavidin proteins. As a coenzyme, biotin supports carboxylation reactions in fatty acid synthesis, gluconeogenesis, and amino acid metabolism. The solution format offers convenience for laboratory workflows, eliminating the need for weighing and dissolution steps.

Physical and Chemical Properties

Biotin solutions are typically clear, though they may appear faintly yellow depending on concentration and solvent. The compound itself has a molecular weight of 244.31 g/mol and features a ureido ring fused with a tetrahydrothiophene ring, giving it stability and specificity in biological interactions. In solution, biotin exhibits good solubility in polar solvents. The pH of aqueous solutions is usually neutral (6-8). Stability is highest when stored refrigerated and protected from light, as prolonged exposure to heat or UV can degrade the compound.

Main Applications

In biochemistry, biotin solutions are primarily used for labeling proteins, nucleic acids, and other molecules via biotinylation. This enables detection or purification using streptavidin-coated surfaces in techniques like ELISA, Western blotting, and affinity chromatography. The solution is also added to cell culture media as a growth factor, particularly for eukaryotic cells. In diagnostics, it serves as a component in hormone assays and tumor marker tests. Industrial applications include its use in fermentation processes and as a supplement in animal feed.

Safety and Storage

While biotin itself has low toxicity (LD50 >5 g/kg in rats), the solution may contain solvents like DMSO that enhance skin absorption. Standard laboratory precautions—gloves, goggles, and lab coats—are recommended when handling. For storage, maintain temperatures between 2-8°C in amber glass bottles to prevent degradation. Shelf life is typically 12-24 months when unopened. Avoid freezing aqueous solutions to prevent precipitation. Always check for precipitation or discoloration before use.

B2B Procurement Guide

When sourcing biotin solution, specify concentration (common ranges: 1-10 mg/mL), solvent type (aqueous, DMSO, or PBS), and purity (≥95% by HPLC). Bulk buyers should request certificates of analysis (CoA) and stability data. Suppliers may offer custom formulations for specific applications like high-throughput screening. Compare pricing per milligram of active biotin rather than per volume, as concentrations vary. Consider vendors with ISO 13485 certification for diagnostic-grade solutions.