Phospholipid composition of articular cartilage boundary lubricant
| Autor: | G. L. Powell, Martine LaBerge, A. V. Sarma |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Cartilage
Articular chemistry.chemical_classification Phosphatidylethanolamine Spectrometry Mass Electrospray Ionization Chromatography Phosphatidylethanolamines Electrospray ionization Fatty Acids Phospholipid Fatty acid Mass spectrometry Sphingomyelins chemistry.chemical_compound Oleic acid chemistry Biochemistry Phosphatidylcholine Fatty Acids Unsaturated Phosphatidylcholines Animals Cattle lipids (amino acids peptides and proteins) Orthopedics and Sports Medicine Lipid bilayer Phospholipids |
| Zdroj: | Journal of Orthopaedic Research. 19:671-676 |
| ISSN: | 1554-527X 0736-0266 |
| Popis: | The mechanism of lubrication in normal human joints depends on loading and velocity conditions. Boundary lubrication, a mechanism in which layers of molecules separate opposing surfaces, occurs under severe loading. This study was aimed at characterizing the phospholipid composition of the adsorbed molecular layer on the surface of normal cartilage that performs as a boundary lubricant. The different types of phospholipid adsorbed onto the surface of cartilage were isolated by extraction and identified by chromatography on silica gel paper and mass spectroscopy. The main phospholipid classes identified were quantified by a phosphate assay. Gas chromatography and electrospray ionization mass spectrometry were used to further characterize the fatty acyl chains in each major phospholipid component and to identify the molecular species present. Phosphatidylcholine (41%), phosphatidylethanolamine (27%) and sphingomyelin (32%) were the major components of the lipid layer on the normal cartilage surface. For each lipid type, a mixture of fatty acids was detected, with a higher percentage of unsaturated species compared to saturated species. The most abundant fatty acid observed with all three lipid types was oleic acid (C18:1). Additional work to further quantify the molecular species using electrospray ionization mass spectrometry is recommended. |
| Databáze: | OpenAIRE |
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