Product Overview

Cresol Red is a sulfonephthalein dye commonly used as a pH indicator and tracking dye in biochemical and analytical laboratories. It exhibits two distinct pH transition ranges: from red to yellow between pH 0.2 and 1.8, and from yellow to violet between pH 7.2 and 8.8, making it highly versatile for use in both strongly acidic and weakly basic environments.

In molecular biology, Cresol Red is often included in electrophoresis loading buffers to track sample migration during gel runs. Its moderate molecular weight allows it to migrate differently than nucleic acids, providing a visual reference without interfering with analysis.

Key Features:

• Dual pH transition ranges:
• Red to yellow: pH 0.2 to 1.8
• Yellow to violet: pH 7.2 to 8.8
• Useful as both a pH indicator and tracking dye
• Compatible with gel electrophoresis systems
• Available in powder or ready-to-use solution formats
• Stable in aqueous solutions and buffer systems

Applications:

• Acid-base titrations and buffer analysis
• Loading dye for DNA/RNA electrophoresis
• Colorimetric pH monitoring in lab procedures
• Educational demonstrations of pH transitions 
• General analytical and research use

Cresol Red is a flexible and easy-to-use dye, favored for its wide pH sensitivity and utility in both classical chemistry and modern molecular workflows.