A Universal Standard for Direct Injection Hydrogen Enthalpimetry of Some Common Unsaturated Lipids

Abstract

The method of hydrogen enthalpimetry as previously applied to unsaturated and polyunsaturated lipids has employed an authentic sample of each lipid analyte for construction of the enthalpimetric calibration curve. This study shows that individual lipid standards are not necessary for several common naturally-occurring fatty acids, methyl esters and simple triglycerides, each of which can be expressed as equivalent mg of methyl oleate. Data are given for six lipids having from one to nine moles of double bonds per mole of analyte, i. e., from oleic acid to trilinolenin.

Key Words:

• enthalpimetry
• lipids
• fats
• fatty acids
• triglycerides
• hydrogen calorimetry
• unsaturated lipids