The main benefits of using ACGI purity in-tube rinsing along with the DIM technique for flavoring analysis is that it can be used for the rapid detection of a wide range of compounds in complex food matrices. The method is based on a combination of chemical ionisation (CI) which is used to form the working end of the inlet membrane and EI source for determination. When the inlet membrane is exposed to positive ions from the CI source, the membrane ions are carried towards the inlet end and react leading to an ion current before reaching the inlet electrode. This causes oxidation of the samples which leads to a change in conductance and can be used to measure conductivity. This change can be a useful and simple method to perform on-site monitoring of food preparation and quality control but future work is required to optimise acquisition parameters and compound identification.
The use of a portable mass spectrometer in combination with the DIM probe has several advantages over the current analysis methods to provide a new strategy for on-site/online analysis of different fragrant compounds in complex matrices. The use of chemical ionisation source, removes the need for a bulky analyser instrument or LC separation which is often required with direct inlet membrane and the ability to detect and identify compounds in complex samples using a handheld mass spectrometer allowing the rapid detection of compounds. This enables users to purchase a DIM probe and DIM or mass spectrometer instrument and use the technology.
This paper demonstrates the effectiveness of a DIM probe coupled to a portable mass spectrometer to provide a handheld method for the on-site/online analysis of complex samples with minimal sample preparation. The analytical results show that the DIM probe coupled with a portable mass spectrometer can be used as a valuable tool for quality control in the flavours and fragrance industry. Future work will involve optimising the membrane parameters to enhance the performance of the DIM probe. It is not possible to perform a validation of the method as no standards exist. This is a prototype instrument and further work is required to optimise the performance and develop quality control methods. d2c66b5586