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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お礼
ありがとうございます。現場を離れて約7年。周りに合成ができる人がおらず、しかし、しなければいけない状況に追い込まれて、思わず、質問してしまいました。身近ではないところに、質問できる方はいるのですが、身近ではないゆえ、この様な低レベルの質問はしづらいために質問させていただきました。何とか感と知識を取り戻し（吸収し）必要な合成ができるようになりたいと思います。今回、ご回答ありがとうございました。（本当に感謝しております）