Description

18-Mercaptooctadecanoic Acid is a high-purity, long-chain thiol fatty acid derivative, serving as a critical functionalized building block for advanced material synthesis. Its unique bifunctional structure, featuring both a terminal thiol (-SH) and a carboxylic acid (-COOH) group, enables precise surface modification and controlled self-assembly. This compound is essential for researchers and manufacturers in nanotechnology, polymer science, and surface chemistry seeking to engineer specific interfacial properties.

Application

• Self-Assembled Monolayers (SAMs): A key precursor for forming highly ordered, covalently bonded monolayers on gold, silver, and other metal surfaces for sensor development and corrosion inhibition.
• Polymer Modification & Crosslinking: Acts as a chain transfer agent or crosslinker in polymerizations to introduce thiol functionality, enhancing material properties like adhesion and elasticity.
• Nanoparticle Functionalization: Used to cap and stabilize metallic (e.g., Au, Ag) and semiconductor quantum dots, controlling their dispersion and surface chemistry for biomedical and optoelectronic applications.
• Lubricant & Fuel Additives: Serves as an intermediate in synthesizing extreme-pressure (EP) additives and multifunctional friction modifiers for high-performance lubricants.
• Bioconjugation & Drug Delivery: Facilitates the covalent attachment of biomolecules (peptides, proteins) or therapeutic agents to carrier systems via thiol-maleimide or thiol-disulfide chemistry.
• Surface Coatings & Adhesives: Improves the adhesion of coatings to difficult substrates and is used in the formulation of high-strength, thiol-based adhesive systems.

Basic Information

Product Name	18-Mercaptooctadecanoic Acid
CAS No.	600730-11-8
Molecular Formula	C₁₈H₃₆O₂S
Molecular Weight	316.54 g/mol
Synonyms	Octadecanoic acid, 18-mercapto-; 18-Sulfanyloctadecanoic acid; 18-Thiaoctadecanoic acid; Stearic acid, 18-mercapto-; Thiolated stearic acid; Mercaptostearic acid; 18-Mercaptostearic acid; HS-(CH₂)₁₇-COOH
EINECS	Contact for details

Quality Control

Our 18-Mercaptooctadecanoic Acid is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including HPLC, NMR, and titration methods, to ensure high chemical purity and consistent performance. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming compliance with agreed specifications. We support cGMP and ISO 9001 standards for research and industrial-grade materials.

Storage

Preserve in a tightly closed container, protected from light. Store under an inert atmosphere (e.g., nitrogen or argon) at 2-8°C to minimize oxidation and prolong shelf life. Keep the container in a cool, dry, and well-ventilated area, separate from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Melting Point	85 - 95 °C
Loss on Drying	≤ 1.0 %
Heavy Metals (as Pb)	≤ 20 ppm

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