Effects of Different Digestion Methods on the Contents of Six Beneficial Elements in Cyclocarya Paliurus Tea

OBJECTIVE To determine the content of six beneficial elements in Cyclocarya paliurus Tea and compare effects of three digestion methods on the content of the measured elements. METHODS The samples of Cyclocarya paliurus Tea were treated by dry digestion, wet digestion and graphite digestion, respectively. Then, 6 elements(Ca, K, Mg, Mn, Zn and Cu) were simultaneously determined by inductively coupled plasma optical emission spectrometry(ICP-OES) and carried out methodological investigation. RESULTS The six elements R² measured by the three digestion methods were 0.998 8-0.999 9, the RSD was 0.1%-5.2%, and the recovery rate was 82.4%-101.8%, all of which met the measurement requirements. Cyclocarya paliurus Tea was rich in Ca, K, Mg and Zn. Wet digestion has superiority. Ca, K could be selected by wet method. Mg and Mn were all available. Dry and wet methods were preferred for Zn. Cu was suitable for dry digestion. CONCLUSION The wet digestion method has superiority to dry digestion and graphite digestion. Graphite digestion has great potential for development as an emerging digestion technology.