Piper betle Linn. is a traditional plant associated with the Asian and southeast Asian cultures. Its use is also recorded in folk medicines in these regions. Several of its medicinal properties have recently been proven. Phytochemical analysis showed the presence ofmainly terpenes and phenols in betel leaves. These constituents vary in the different cultivars of Piper betle. In this paper we have attempted to profile eight locally available betel cultivars using the recently developed mass spectral ionization technique of direct analysis in real time (DART). Principal component analysis has also been employed to analyze the DART MS data of these betel cultivars. The results show that the cultivars of Piper betle could be differentiated using DART MS data. DART?-OS 實(shí)時(shí)直接分析 DART?-MS 實(shí)時(shí)直接分析質(zhì)譜系統(tǒng) DART? SVP 實(shí)時(shí)直接分析-質(zhì)譜系統(tǒng)