Description

Neutral Red is a vital metachromatic dye and biological stain with the CAS registry number 553-24-2. This compound is essential for its role as a pH indicator and redox probe in various life science and analytical applications. It is primarily used by researchers and industrial laboratories in biotechnology, histology, and microbiology for vital staining and viability assays.

Application

• Biological Staining: Used as a vital stain for living cells in microscopy and histology to differentiate cell types and structures.
• Microbial Viability Assays: A key component in assays to determine bacterial and yeast viability, often used in food safety and pharmaceutical testing.
• pH Indicator: Functions as a pH indicator in culture media and biochemical solutions, with a color change range typically between pH 6.8 (red) and 8.0 (yellow).
• Redox Indicator: Employed in biochemical studies to monitor redox potential and electron transport in mitochondrial and cellular respiration experiments.
• Lysosome Tracking: Used in cell biology to selectively stain lysosomes and study their function and acidity.
• Industrial Dye Intermediate: Serves as a precursor or intermediate in the synthesis of more complex dyes and pigments.

Basic Information

Product Name	Neutral Red
CAS No.	553-24-2
Molecular Formula	C15H17ClN4
Molecular Weight	288.78 g/mol
Synonyms	Basic Red 5; Toluylene Red; Neutral Red Chloride; 3-Amino-7-dimethylamino-2-methylphenazine hydrochloride; C.I. 50040; Aminodimethylaminotoluophenazonium Chloride; Neutral Red (Indicator)
EINECS	209-035-8

Quality Control

Our Neutral Red is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including identification, purity assay, and impurity profiling, to ensure it meets the high standards required for research and industrial use. Certificates of Analysis (COA) detailing specifications and test results are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark green crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
pH (Saturated Solution)	6.8 - 8.0 (Color transition range)
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in water and ethanol

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.