Description

Alpha, Beta, Beta 20R 24S-Methylcholestane is a high-purity, sterane-based reference standard and synthetic intermediate of significant importance in analytical chemistry and organic synthesis. Its precisely defined stereochemistry makes it an invaluable tool for the calibration and validation of analytical instruments, particularly in petrochemical and geochemical biomarker studies. This compound is essential for researchers and quality control laboratories in the petroleum, environmental science, and advanced organic synthesis sectors.

Application

• Analytical Reference Standard: Primary use as a certified reference material (CRM) for gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) in biomarker analysis.
• Petroleum Geochemistry: Critical for the identification and quantification of sterane biomarkers in crude oils and source rocks to assess thermal maturity and depositional environment.
• Organic Synthesis: Serves as a key chiral building block or intermediate in the synthesis of complex steroidal compounds and other biologically active molecules.
• Environmental Forensics: Used as a tracer in studies of environmental contamination and oil spill fingerprinting.
• Pharmaceutical Research: Potential intermediate in the research and development of novel therapeutic agents due to its sterane core structure.
• Method Development & Validation: Employed by analytical laboratories to develop, optimize, and validate chromatographic methods for sterane separation and detection.

Basic Information

Product Name	Alpha, Beta, Beta 20R 24S-Methylcholestane
CAS No.	71117-90-3
Molecular Formula	C₂₈H₅₀
Molecular Weight	386.70 g/mol
Synonyms	20R-24S-Methylcholestane; 24S-Methyl-5α-cholestane (20R); 5α-Cholestane, 24-methyl-, (20R,24S)-; (20R,24S)-24-Methylcholestane; 20R-24S-Methyl-5α-cholestane; Sterane Reference Standard C28; Biomarker Standard C28; 24S-Methylcholestane (20R)
EINECS	Contact for details

Quality Control

Every batch of Alpha, Beta, Beta 20R 24S-Methylcholestane is produced and analyzed under strict quality management protocols to ensure the highest standards of identity, purity, and stereochemical integrity. Our products undergo rigorous quality testing, including chromatographic purity assays and spectroscopic identification, to ensure compliance with research and analytical standards. A comprehensive Certificate of Analysis (COA) detailing batch-specific results is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store at controlled room temperature (15-25°C) in a cool, dry, and well-ventilated area. Keep away from heat and open flame.

Specification

Item	Specification
Appearance	White to off-white crystalline solid
Identification (IR)	Conforms to structure
Purity (GC)	≥ 98.0%
Purity (GC-MS)	≥ 97.0%
Stereo-isomeric Purity	≥ 95.0% (20R,24S)
Melting Point	Contact for details

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