A high-performance liquid chromatographic(HPLC)method was established for the separation of various phenols.The extraction efficiency of phenols from camellia oil by the liquid-liquid extraction(LLE)was compared with that by the solid-phase extraction(SPE)method,and the experimental conditions,e.g.mobile phase types,detected wavelength and injection amount of samples were optimized.Under the optimal conditions,all 23 phenols were successfully separated in 60 min.Good linear relationships were obtained in the concentration range of 0.059-9.115 μg/g for 23 phenols,with their correlation coefficients of 0.977 6-1.000 0.The detection limits were in the range of 0.041-0.379 μg/g.The relative standard deviations were between 0.7% and 10.1%.The average recoveries of 23 phenols in camellia oil were between 72% and 101%.The proposed method was applied in the determination of phenols in camellia oil sample,and nine phenolics,including hydroxytyrosol,protocatechuic acid,catechins,p-hydroxybenzoic acid,chlorogenic acid,vanillic acid,catechin gallic acid,p-coumaric acid and ferulic acid,were identified with their contents of 1.178,2.749,1.714,1.287,0.223,0.363,0.219,0.363,0.097 μg/g,respectively.The results indicated that the method was accurate and reliable,and was suitable for the analysis of different phenols in various camellia oils.
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Changzhou Industrial and Consumable Products Inspection Company Limited
Nanjing Customs Testing Center for Dangerous Goods and Packaging
School of Chemical and Environmental Engineering,Jiangsu University of Technology