Atom Sci. Congo Red C.I. 22120

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Specifications:
Application Microbiology
Storage Temperature Ambient
Product Type Dye Forms Powder
Product Brand Atom Scientific
Product Grade Analytical grade Formula C₃₂H₂₂N₆Na₂O₆S₂

Anionic Benzidine-Based Diazo Dye for Amyloid Staining and Cell Wall Studies

Congo Red is a classic histochemical stain widely used in biological and pathological research. As an anionic diazo dye, it binds specifically to amyloid structures, β-D-glucans, and other polysaccharides, making it a valuable tool in the study of protein aggregation, fungal cell walls, and plant cell microstructures. Its sharp colorimetric transition and strong binding properties support its use in microscopy, histology, and amyloid detection assays.

Key Features

  • High purity C.I. 22120 dye for biological and analytical applications
  • Binds to amyloid fibrils and β-glucans with high affinity
  • Distinct pH-dependent color shift (blue to red from pH 3.5–5.0)
  • λmax at 585 nm suitable for spectrophotometric quantification
  • Stable dry powder form with <2.5% moisture content

Specifications

PropertyValue
Chemical NameCongo Red
C.I. Number22120
Molecular FormulaC₃₂H₂₂N₆S₂Na₂
Molecular Weight696.66 g/mol
Absorbance Maximum (λmax)585 nm
Melting Point360 °C
Loss on Drying<2.5%
pH Transition Range3.5–5.0 (Blue to Red)
AppearanceReddish powder
StorageAmbient temperature

Applications

  • Amyloid Detection – Histochemical stain for visualizing amyloid deposits in brain and tissue sections
  • Fungal Cell Wall Studies – Used to inhibit and study fungal growth (e.g., Cryptococcus neoformans)
  • Plant Histology – Confocal microscopy staining of plant cell walls (e.g., potato tissue analysis)
  • Biophysical Research – Investigation of β-D-glucans, galactoglucomannans, and polysaccharide interactions
  • Protein Aggregation – Quantification of amyloid β-peptide aggregation and fibrillization

Ordering Information

Product CodePack Size
RRBD75-U10 g
RRBD75-W25 g
RRBD75-2W50 g
RRBD75-X100 g


Congo Red (C.I. 22120) is a reliable and widely used dye for staining amyloid structures, studying fungal cell walls, and visualizing polysaccharide networks in plant and biological tissues. Its strong binding properties and well-characterized optical behavior make it indispensable in both research and clinical histology laboratories.

  • Pack Size:   100g 10g 25g 50g
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