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KMID : 0380620100420060699
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Korean Journal of Food Science and Technology
2010 Volume.42 No. 6 p.699 ~ p.704
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Rancidity Analysis of Rapeseed Oil under Different Storage Conditions Using Mass Spectrometry-based Electronic Nose
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Hong Eun-Jeung
Lim Chae-Lan
Son Hee-Jin
Choi Jin-Young
Noh Bong-Soo
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Abstract
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Rapeseed oil was stored under different conditions such as in the dark, with UV treatment, and with prooxidantscytochrome C and copper ion. The rapeseed oils stored at different temperatures were analyzed by a mass spectrometrybased electronic nose and discriminant function analysis (DFA). Volatile components in the rapeseed oil increased with storage time, and the discriminant function first score (DF1) moved from a positive position to a negative position as storage time increased. Changes in DF1 were higher under UV treatment than under the dark condition (DF1: r2=0.9481, F=307.03). The different DF1 values (F1) under the dark condition were 0.099, 0.187, and 0.278 as storage temperature increased. The different values under UV treatment were 0.554, 0.588, and 0.542, as storage temperature increased from 4 to 26oC. As concentrations of prooxidants copper ion and cytochrome C increased, amounts of volatile components also increased. These were confirmed by DFA. Furthermore, changes in responses at each ion fragment agreed with reported results for GC/MS, which formed after rancidity of the oil, including pentane, pentanal, 1-pentanol, hexanal, n-octane, 2- hexenal, heptanal, 2-heptenal, decane, 2-octenal, undecane, and dodecane.
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KEYWORD
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electronic nose, mass spectrometry, rapeseed oil, rancidity, discriminant function analysis (DFA)
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