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Phenol Red powder used as a pH indicator in cell culture and microbiology research
  • Phenol Red powder used as a pH indicator in cell culture and microbiology research
  • Phenol Red powder used as a pH indicator in cell culture and microbiology research
Phenol Red Powder

Phenol Red Powder

$19.00
Weight

Phenol Red Powder (Phenolsulfonphthalein)

pH Indicator for Cell Culture & Microbiological Research

Catalog Number: ASC-1005
CAS Number: 143-74-8
Molecular Formula: C₁₉H₁₄O₅S
Molecular Weight: 354.38 g/mol

Overview

Phenol Red Powder (Phenolsulfonphthalein) is a widely used laboratory pH indicator supplied in solid powder form for controlled research applications. It is commonly incorporated into cell culture media and microbiological formulations to allow visual monitoring of pH changes during growth and metabolic activity.

The dye exhibits a clear colour transition from yellow under acidic conditions to red under neutral to mildly alkaline conditions, making it a reliable indicator of environmental pH within culture systems. Due to its stability and well-characterised behaviour, Phenol Red is a standard component in many research and teaching laboratories.

Ausamics Phenol Red Powder is supplied as a high-quality bioreagent, offering consistent colour response, solubility, and batch-to-batch reliability.

Typical Applications

Cell Culture Research

  • Visual monitoring of pH changes in culture media

  • Supportive indicator for metabolic activity in cell growth systems

Microbiology & Laboratory Research

  • pH indicator in liquid and solid media

  • Observation of acid or base production during microbial growth

Research & Teaching Laboratories

  • Demonstration of pH-dependent colour indicators

  • Method development and experimental optimisation

Principle of the Indicator

Phenol Red responds to changes in hydrogen ion concentration by altering its molecular structure, resulting in a visible colour shift. It appears yellow in acidic environments (approximately pH < 6.8) and transitions to red in neutral to alkaline environments (approximately pH > 8.2). This behaviour allows rapid visual assessment of pH trends in laboratory media under controlled conditions.

Physical & Chemical Properties

  • Appearance: Red to dark red crystalline powder

  • Solubility: Soluble in water

  • pH Transition Range: Approx. 6.8–8.2

  • Chemical Class: Sulfonephthalein dye

Storage & Stability

Store in a cool, dry place at 15–25 °C.
Protect from light and moisture.
Keep container tightly sealed when not in use.

Stable under recommended storage conditions.

Intended Use

For laboratory research and educational use only.

Not for human or animal use.
Not intended for diagnostic, therapeutic, veterinary, agricultural, food, or feed applications.

Quality & Documentation

  • Certificate of Analysis (COA) available

  • Safety Data Sheet (SDS) available upon request

  • Manufactured and supplied under controlled quality conditions

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