Overview
Digitonin is a naturally occurring glycoside extracted from the seeds and leaves of Digitalis plants, such as Digitalis purpurea (foxglove). It is widely utilized in biochemical and cell biology research due to its ability to selectively bind to cholesterol and permeabilize cell membranes without disrupting protein-protein interactions. Originally identified for its cardiac effects, digitonin has found niche applications in scientific research, particularly in membrane studies. Its non-ionic detergent properties make it valuable for solubilizing membrane proteins while maintaining their native structure.
Physical and Chemical Properties
Digitonin is a white crystalline powder with a molecular weight of 1229.31 g/mol. It decomposes at 235-240°C and is soluble in water, ethanol, and methanol. Its solubility in organic solvents makes it versatile for laboratory applications. The compound’s key feature is its selective binding affinity for cholesterol, forming insoluble complexes. This property is exploited in protocols requiring controlled membrane disruption, such as organelle isolation or immunostaining procedures where gentle permeabilization is critical.
Main Applications
Digitonin is primarily used in research settings for cell membrane permeabilization, enabling the study of intracellular components. It is indispensable in cholesterol extraction protocols and the purification of membrane-bound proteins, such as G-protein-coupled receptors (GPCRs). Additionally, digitonin serves as a tool in histology to enhance antibody penetration for immunofluorescence. Its ability to lyse cells without denaturing proteins makes it preferable to harsher detergents like SDS in delicate experiments.
Safety and Storage
Digitonin is classified as harmful if ingested or inhaled. Laboratory personnel should wear gloves, goggles, and work in a fume hood to minimize exposure. Skin contact may cause irritation, and proper ventilation is essential during handling. For long-term stability, store digitonin in a tightly sealed container at 2-8°C, protected from moisture and light. Solutions should be prepared fresh or aliquoted and frozen at -20°C to prevent degradation.
B2B Procurement Guide
When sourcing digitonin for industrial or research use, prioritize suppliers with ISO certification and batch-specific purity reports (HPLC ≥95%). Bulk purchases (100g+) may qualify for discounts, but verify shelf life and storage conditions during transit. Consider alternative brands like Merck Millipore or Sigma-Aldrich for consistent quality. For specialized applications (e.g., diagnostic kits), request custom purity grades or endotoxin testing to meet regulatory requirements.
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