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Quantification of soybean oil ethanolysis with 1 H NMR
Author(s) -
Costa Neto Pedro Ramos,
Balparda Caro Miguel Soriano,
Mazzuco Lilian Maria,
Nascimento Maria da Graça
Publication year - 2004
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-004-1026-0
Subject(s) - biodiesel , transesterification , glycerol , chemistry , soybean oil , ethyl ester , proton nmr , chromatography , high performance liquid chromatography , organic chemistry , methanol , food science , catalysis
In this study, proton NMR spectroscopy (200 MHz) was used for quantifying the content of ethyl esters in known mixtures of soybean oil and ethyl soyate (biodiesel). For this purpose, the peak areas of ester ethoxy and glycerol methylenic peaks in the region of 4.05–4.40 ppm were measured and a calibration plot of the respective peak areas vs. the known composition of the oil/ethyl ester mixtures was used. The transesterification values determined in this way were compared with viscosity and total glycerol determinations and a good correlation was obtained. Therefore, for routine analysis, the conversion (in %) of oil to ethyl esters was determined. The methodology presented in this work proved to be quicker and simpler than others reported in the literature, such as GC and/or HPLC.