Abstract
Near infrared spectroscopy offers advantages in the analysis of vegetable oils such as rapidity, relative cost-effectiveness, and usually no need for sample preparation. Virgin Sunflower oils were used as reference standards to develop spectra library for qualitative identification and validation of the method. This model was validated by correct classification method using positive and negative control samples. Various market samples of virgin sunflower oil were purchased and compared with spectra library. The results of spectral analysis of reference library and market samples were correlated using Mahalanobis distance method. Analysis involved 22 market samples. When these samples were matched against calibration samples, 4 samples out of 22 which are about 18.2% were not matched by the reference model. These market samples had Mahalanobis distance values between 4.2 and 6.7, which are greater than maximum permissible value of 3. Some of adulterants mentioned were Korie oil and pumpkin seeds oil.
Highlights
Sunflower oil is obtained from good mature sunflower seeds of the species of a family Helianthus annuus L of a family Compositae, by a process of expression or solvent extraction [1]
The following is a spectral display of absorbance of 300 sunflower oil samples that were used to develop a qualitative model in a near infrared region of 350 nm to 2500 nm
Samples showed similar pattern of absorbance though there were differences in the level of absorbance between samples. These might have arisen due to the fact that samples were collected from different sources with different geographic conditions which may have had an influence on the quality of sunflower seeds and on sunflower oil
Summary
Sunflower oil is obtained from good mature sunflower seeds of the species of a family Helianthus annuus L of a family Compositae, by a process of expression or solvent extraction [1]. Sunflower oil obtained by either expression or solvent extraction exists in two forms of either raw grade or refined grade. These methods are designed for analysis of only one specific parameter at a time and tend to be tedious, expensive and often require hazardous solvents and reagents. It is due to these reasons that a fast and relatively cheap method like Near Infrared Spectroscopy (NIR) has been designed
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