Description

Alizarin Red S is a water-soluble, anthraquinone-derived dye and a versatile biochemical reagent. It serves as a critical tool for the selective histochemical staining of calcium deposits and is widely used in analytical chemistry as a metallochromic indicator. This product is essential for professionals in life science research, histopathology, and industrial quality control who require reliable and consistent staining results.

Application

• Histological Staining: Primary application for the visualization of calcium salts (e.g., calcium phosphate, calcium carbonate) in bone, cartilage, and pathological calcifications in tissue sections.
• Biochemical Research: Used as a calcium-specific dye in assays to study mineralization processes in cell cultures, such as osteoblast differentiation.
• Analytical Chemistry: Functions as a complexometric indicator for the titration of metals like aluminum, fluoride, and thorium.
• Industrial Quality Control: Employed in the detection and quantification of calcium in various materials, including water, cement, and food products.
• Geological Studies: Stains carbonate minerals in rock thin sections for petrographic analysis.
• Educational Laboratories: A standard reagent for teaching histological techniques and complexometric titration principles in university settings.

Basic Information

Product Name	Alizarin Red S
CAS No.	130-22-3
Molecular Formula	C14H7NaO7S
Molecular Weight	342.26 g/mol
Synonyms	Alizarin Carmine; Alizarin Red; Alizarin Sulfonate Sodium Salt; Mordant Red 3; C.I. 58005; Sodium Alizarinsulfonate; 3,4-Dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-sulfonic acid sodium salt; 9,10-Dihydro-3,4-dihydroxy-9,10-dioxo-2-anthracenesulfonic acid sodium salt
EINECS	204-981-8

Quality Control

Our Alizarin Red S is manufactured under a strict quality management system. Each batch is tested to ensure high purity and performance consistency for critical applications like histochemical staining. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and relevant functional tests is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at room temperature (15-25°C). The product is light-sensitive and should be handled accordingly to maintain stability.

Specification

Item	Specification
Appearance	Orange-brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0 %
pH (1% Solution)	4.0 - 6.0
Water Solubility	Completely soluble
Staining Performance	Passes visual test on control tissue

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