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|Type:||Artigo de periódico|
|Title:||Free and Total Glycerin in Biodiesel: Accurate Quantitation by Easy Ambient Sonic-Spray Ionization Mass Spectrometry|
de Sa, GF
|Abstract:||Quantitation of free and total glycerin content in biodiesel is performed via a simple and direct ambient desorption/ionization mass spectrometric technique. Easy ambient sonic-spray ionization mass spectrometry (EASI-MS) is applied to either the crude or derivatized sample spiked with an internal standard allowing for immediate quantitation of free and total glycerin, a major quality parameter for biodiesel. The linear range obtained by EASI-MS for free glycerin was from 0.005 to 0.100% (m/m), and that for bound glycerin (mono-, di-, and triacylglycerides) was from 0.01 to 0.50% (m/m). These values are in concordance with those required by major regulatory agencies for biodiesel quality control, which are, for free glycerin, a 0.02% (m/m) maximum and, for total glycerin, a 0.25% (m/m) maximum. The simple and fast EASI(+)-MS protocol seems to offer a proper substitute or alternative for the more demanding and time-consuming gas chromatography with flame ionization detection (GC-FID) standard methodology.|
|Editor:||Amer Chemical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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