英論文について
The peroxide value (PV) was determined by the ferric
thiocyanate method [9]. A 0.1-g oil sample was weighed
and 9.7 ml ethanol added. Thus, the oil was dissolved.
Next, 0.1 mL NH4SCN and 0.1 mL FeCl2 were added to
the above-mentioned solution, and kept at room temperature
for 5 min. Absorbance of the sample was measured at
500 nm. The results were expressed in mequiv/kg oil.
TBARS (2-thiobarbituric acid-reactive substances) was
determined as described by Abuzaytoun et al. [16].
A 0.05–0.20-g oil sample was weighed into 25-mL volumetric
flasks, dissolved in a small volume of 1-butanol, and
made up to the mark with the same solvent. A 5.0-mL
portion of this mixture was transferred into a dry test tube,
and then a fresh 2-TBA reagent (5 mL of a solution of
200 mg 2-TBA in 100 mL 1-butanol) was added to it. The
contents were mixed and heated in a water bath at 95 C
for 2 h. The absorbance of the resultant colored complex
was measured at 532 nm. The TBARS values were calculated
by multiplying the absorbance reading by a factor
of 0.347. This factor was determined from a standard line
prepared using 1,1,3,3-tetramethoxypropane as a precursor
of malonaldehyde (MA). The results were expressed in
mmol MA equiv/g oil.
The induction period of the oil samples were determined
by the Metrohm Rancimat apparatus model 743 (Metrohm,
Switzerland) [17]. Then, 4.0 g of each oil sample was
weighed in the reaction vessel glassware. The conductimetry
cells were filled with deionized water up to 90 mL.
Samples were heated at 110 C and air was passed through
the heated oil at a rate of 20 L/h. The induction period was
determined automatically by the device and expressed in
hours.
The infrared spectra of the samples were recorded on a
FTIR (Varian 1000 Model) system with a horizontal
attenuated total reflectance (ATR) apparatus [18]. The
spectrometer was equipped with a deuterated triglycine
sulfate detector and purged with dry nitrogen (DuraDry,
Haverhill, MA). The ATR crystal was cleaned with pure
chloroform before each measurement. A 40-lL oil sample
was spread as a thin layer in the ATR crystal and periodical
scans (18 scans, 4 cm-1 resolution) were obtained in the
spectral range of 400–4,000 cm-1 at 20-min intervals for
360 min. The induction times, i.e. the time needed for a
dramatic increase in absorbance, were determined algebraically
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