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Quantitation of volatile compounds in heated triolein by static headspace capillary gas chromatography/infrared spectroscopy‐mass spectrometry
Author(s) -
Mahungu Symon M.,
Hansen Steven L.,
Artz William E.
Publication year - 1994
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/bf02540530
Subject(s) - triolein , nonanal , heptanal , chemistry , octanal , heptane , mass spectrometry , chromatography , hexanal , octane , analytical chemistry (journal) , organic chemistry , aldehyde , lipase , enzyme , catalysis
Static headspace and capillary gas chromatography/infrared spectroscopy‐mass spectrometry were used to collect, separate, identify and quantitate the oxidative and thermal decomposition products in heated triolein. Approximately 4 L of triolein was heated in a deep‐fat fryer at 190°C for 12 h each day for a total of 60 h, until it contained>‐20% polymeric material. The concentration of heptane and octane increased after 12 h heating, then decreased upon further heating, while the concentration of volatile aldehydes decreased gradually during heating. After 12 h of heating, the concentrations of the major volatiles changed as follows: heptane (16.36 to 30.17 ppm), octane (24.48 to 40.77 ppm), heptanal (21.68 ppm to 9.11 ppm), octanal (35.53 to 36.64 ppm), nonanal (68.95 to 43.16 ppm), (E)‐2‐decenal (135.00 to 89.00 ppm) and (E)‐2‐undecenal (88.50 to 61.00 ppm). After 60 h of heating, when the oil contained over 20% polymeric material, the concentrations of heptane, octane, heptanal, octanol, nonanal, (E)‐2‐decenal and (E)‐2‐undecenal were 5.16, 4.39, 5.45, 7.02, 18.07, 12.50 and 6.00 ppm, respectively.