Laser ionization/time-of-flight mass spectrometry for the direct analysis of emulsions

Abstract

A direct method for the monitoring of emulsions was developed using laser ionization/time-of-flight mass spectrometry.

A Quantitative Analysis of an Oil Component in an Emulsion by Multiphoton Ionization Mass Spectrometry

“…17 With this technique, we demonstrated the possibility of evaluating the creaming of emulsions from the time course of a peak area. 15 In the present study, we demonstrated the possibility of a quantitative analysis of an oil component in an emulsion via MPI-TOFM, which has not been achieved. We constructed a calibration curve of styrene, as an oil phase, in an O/W emulsion.…”

“…This system consists of a pair of concentric capillary columns. 15 By using MPI-TOFMS combined with this introduction system, we continuously obtained a series of mass spectra, and then constructed a time profile of the peak area of a constituent. Previously, we often found intense spikes on the time profiles for a constituent of an oil phase in an oil-in-water (O/W) emulsion; such spikes indicated the existence of oil droplets or their aggregates.…”

“…Recently, we reported on the results of the online monitoring of emulsions with no pretreatment using multiphoton ionization time-of-flight mass spectrometry (MPI-TOFMS). [15][16][17][18] MPI-TOFMS has several advantages, such as spectroscopic selectivity and robustness, [19][20][21][22][23][24][25] and several applications have been reported such as online monitoring of the environment.…”

Application of Laser Ionization Time-of-Flight Mass Spectrometry for the Direct Measurement of a Silane Coupling Agent in Slurries

“…In addition, we also applied LI-TOFMS to the measurement of liquid samples, 34,35 including emulsions. [36][37][38][39] In the present study, we treated TiO2 nanoparticles with PTES and prepared slurry samples where PTES either remained or was removed by washing. Then, a direct mass analysis of the slurries was performed by LI-TOFMS, and we confirmed whether the remaining PTES could be detected.…”

Multiphoton Ionization Time-of-Flight Mass Spectrometry for the Detection of Bioactive Lignan

“…12,13 Recently, we reported on the use of vaporization and subsequent ionization techniques for measuring of a liquid sample without using a frit. 14,15 Volatile compounds in aqueous solution are usually detected online. 14 In that report, we irradiated a pulsed laser for vaporization to an inlet nozzle, and analyte molecules could be partially introduced in a pulsed form.…”