Abstract
The nuclear magnetic resonance (NMR) technique was applied to monitor the quality of tea oil herein. The adulteration of virgin tea oil was monitored by 19F NMR and 1H NMR. The 19F NMR technique was used as a new method to detect the changes in quality and hydroperoxide value of tea oil. The research demonstrates that 19F NMR and 1H NMR can quickly detect adulteration in tea oil. High temperature caused a decrease in the ratio D and increase in the total diglyceride content. Some new peaks belonging to the derivatives of hydroperoxides appeared at δ-108.21 and δ-109.05 ppm on the 19F NMR spectrum when the oil was autoxidized and became larger when the hydroperoxide value increased. These results have great significance in monitoring the moisture content, freshness and oxidation status of oils and in detecting adulteration in high priced edible oils by mixing with cheap oils.
Highlights
Camellia oleifera, commonly called oil tea tree, belongs to the Theaceae family and has been widely cultivated in China for a long time (Qin et al, 2018)
The main principle of the method is based on the derivatization of the active hydroxy groups like diglycerides (DGs) and water with 4-fluorobenzoyl chloride, and the integration of the appropriate peaks in the 19F nuclear magnetic resonance (NMR) spectrum in the MestReNova
The quality of tea oil was analyzed by calculating the characteristic peak appearing on the 19F NMR spectrum
Summary
Commonly called oil tea tree, belongs to the Theaceae family and has been widely cultivated in China for a long time (Qin et al, 2018). Camellia oil is widely referred to as tea oil and is commonly utilized for cooking in China (Tu et al, 2017) It is rich in unsaturated fatty acids such as linolenic, linoleic and oleic acids (Weng et al, 2018). There are some unsaponifiable compounds such as tocopherols, squalene, phytosterols, and flavonoids present in tea oil (Memon, 2011; Xiao et al, 2016). These nutrients can be digested and absorbed by the human body, and are beneficial to lowering cholesterol, preventing and treating hypertension, and cardiovascular diseases (Wang et al, 2012; Lee and Yen, 2006). Some unscrupulous merchants adulterate tea oil with other low-price plant oils in order to make higher profits
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