单光子电离质谱法在线分析牙膏中的香精物质

摘要

A new method was developed for the on-line analysis of flavor compounds in toothpastes without any sample preparation by direct injection time-of-flight mass spectrometry with single photon ionization (SPI-TOFMS). The samples were directly taken into the ionization source by the quartz capillary tube and the pressure condition of the ionization source was optimized. Under the discrimination of characteristic mass spectra of flavor compounds, rapid and accurate identification of flavors in toothpastes was achieved. The analysis time for a single sample was only 0. 5 min. This method was applied to on-line and in-situ monitoring of flavor compounds during tooth brushing process. The influence of water content on release of flavor compounds from toothpastes was studied. The results indicate that direct injection SPI-TOFMS can monitor the composition and concentration of flavor compounds in real time. The method could be suitable to analyze the flavors from various samples such as food and cosmetics.%在无需样品前处理的条件下,建立了直接进样单光子电离飞行时间质谱在线分析牙膏样品中香精物质的方法.本方法采用石英毛细管直接将样品导入质谱仪电离区,优化了电离区气压条件,并利用香精标准品的特征质谱信号对牙膏样品中香精成分进行了快速、准确鉴定,单个样品分析仅需0.5 min.将本方法应用于模拟刷牙过程中挥发性香精的在线、原位监测,考察了水含量对牙膏香精挥发过程的影响.结果表明,直接进样单光子电离飞行时间质谱法能够实时监控刷牙过程中挥发香精的成分与浓度,可以应用于其他样品如食品、化妆品中香精成分的分析.