RESUMEN
<p><b>OBJECTIVE</b>To develop a LC-MS-MS method for determination of adenosine and cordycepin in Cordyceps sinensis and it's substitutes.</p><p><b>METHOD</b>The sawple was extracted with. 90% methanol. Multi-reactions monitoring (MRM) technique was adopted.</p><p><b>RESULT</b>The regression equations and coefficients were Y = 89.04X + 506.85 (r = 0.999 7) for adenosine, Y = 99.66X + 1 251.34 (r = 0.998 8) for cordycepin respectively. The linear range was 5.0-1 000.0 microg x L(-1) for adenosine and cordycepin. The limits of detection (LOD) were 0. 44 microg x L(-1) for adenosine and 0.31 microg x L(-1) for cordycepin, respectively. The average recoveries of adenosine and cordycepin were 98.1% and 97.9%, respectively.</p><p><b>CONCLUSION</b>The method was highly sensitive, selective and fast, which can be used for the determination of adenosine and cordycepin in C. sinensis and it's substitutes. This method can also be applied for the quality control of the medicinal materials.</p>