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| Identification of tea oil adulteration by ultravioletspectrum combined with chemometrics |
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| Abstract: |
| An approach of ultraviolet（UV）spectra combined with chemometrics was used to identify the
adulteration of tea oil in this study. The pure tea oil and adulterated peanut oil，adulterated rapeseed oil，adulterated
palm oil samples were scanned by UV spectra. The results showed that，the ultraviolet spectra of pure tea oil and three
adulterated samples were different. The spectral data were smoothed in the wavelength range from 200 to 400 nm，then
were compressed by using principal component analysis，and were recognized by establishing model and the principal
component were projective. The results showed that，the cumulative credibility of the first three principal components of
three adulterated samples also achieved the requirement. In the two dimensional combination projection，the projection
distribution of PC1 to PC2 was the best in three kinds of adulteration oil，the projection among different adulteration
ratios of peanut oil，rapeseed oil，palm oil and pure tea oil could be clearly distinguished，the greater of adulteration
ratio，the better differentiating effects between adulteration samples and pure tea oil were obtained. The differentiating
effect order between pure tea oil and three adulteration oil samples was as follows：adulterated peanut oil > adulterated
rapeseed oil > adulterated palm oil. The results indicate that this method can be used as a simple and reliable method to
identify the adulteration of tea oil. |
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