Nuclear Magnetic Resonance technique for quality control
of cold-pressed rice bran oil
ประเภทบทความ :
บทความวิชาการ
หมวดหมู่ :
วิทยาศาสตร์
A Nuclear Magnetic Resonance (NMR) method is developed and applied for fingerprint characterization
of rice bran oil from Thai domestic production and quantitative determination of fatty acid compositions. Freshness
evaluation was investigated by analysis of diacylglycerol or monoacylglycerol level in cold-pressed rice bran oil.
The investigation using -carbon intensity of triacylglycerol as reference peak and internal standard demonstrated
that the method presented variance (Analysis of variance, p 0.05) with high Level of Confidence (95%). This
method allows rapid identification of rice bran oil in the market, claimed as cold-pressed rice bran oil from domestic
production in Thailand. Applying NMR technique, Thai export industry of rice bran oils can meet satisfied
specification by international importers without many wet, dirty and error prone chemical methods in Quality
Control laboratory. Qualitative analysis of diacylglycerol or monoacylglycerol showed no signal in freshly samples,
but revealed with slightly stronger peaks after one year storage, represent by proportion of 1,2-diacylglycerol and 1-
monoacylglycerol in triacylglycerol which changed over time. Results obtained in this study will serve as quality
control and useful reference for supplement development and pharmaceutical industry.
วันที่ลง01/07/2019
613
