Quantity of trace formaldehyde and acetaldehyde in beer could be directly determined by LC-MS/MS based on standard curve after derived by 2, 4- DNPH.

• 摘要啤酒中的微量甲醛和乙醛经2，4-二硝基苯肼衍生后直接用LC-MS/MS检测，标准曲线定量。