Journal
ENERGY & FUELS
Volume 24, Issue 8, Pages 4518-4521Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ef100545a
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Funding
- National Science Foundation (NSF) [0936994]
- NSF Division of Molecular and Cellular Biosciences (MCB) [0920713]
- NSF [0718275]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0936994] Funding Source: National Science Foundation
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [0920713] Funding Source: National Science Foundation
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Biodiesel, fatty acid methyl esters derived from vegetable oils, is a well-established alternative to petroleum diesel. We have developed a rapid H-1 diffusion-ordered nuclear magnetic resonance spectroscopy (DOSY NMR) method to resolve mixtures of mono-, di-, and triacyglycerols along with their methyl esters. Because of the differences in diffusion coefficients between the starting materials (triglycerides), intermediates (mono- and diglycerols), and products (methyl esters), we were able to accurately predict the formula weights of these species in solution. This technique was used to monitor transesterification reactions of virgin and waste vegetable oils. In addition to proving its utility to assess conversion of starting materials, we found that 1,3-diacylglycerol is the major intermediate formed during alkali-catalyzed biodiesel production.
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