|
KMID : 1007519960050030210
|
|
Food Science and Biotechnology
1996 Volume.5 No. 3 p.210 ~ p.214
|
|
|
Determination of Rancidity of Soybean Oil by Near - Infrared Reflectance Spectroscopy
|
|
Kim, Jee Young
Cho, Seung Yong/Rhee, Chul
|
|
|
Abstract
|
|
|
|
We used the technique of near-infrared reflectance (NIR) spectroscopy in order to test its use as a potential method for determining the rancidity of soybean oils undergoing autoxidation. Commercial soybean oil was used as substrate and was oxidized at 75℃ until the oxidized oil reached the hydroperoxide decomposition stage. Peroxide values (POVs) and acid values (AVs) of the substrate were determined periodically and the results were correlated with NIR spectral absorbances. The POV calibration equation accurately predicted the rancidity of oil in the hydroperoxide accumulation stage. Two wavelengths (2080 and 2020㎚) were used for the POV calibration, and the resulting coefficient of multiple determination for regression was quite high (r=0.9970, SEC=9.10 meq/㎏ oil and SEP=9.67 meq/㎏ oil). However, the AV calibration equation was a better predictor of oil rancidity than the POV calibration equation at higher POV ranges. Three wavelengths (2008, 1442 and 1752㎚) were used for AV calibration. High correlations were achieved between chemically analyzed and NIR predicted AV (r=0.9987, SEC=0.127㎎ KOH/g oil, and SEP=0.137㎎ KOH/g oil).
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|