Which mass spectrometers are compatible with imaging mass spectrometry ion sources? A summary of compatibility with mainstream models

When procuring mass spectrometry imaging ion sources, the most frequently asked question is not ‘what is the resolution?’, but rather ‘will it fit on the main instrument in our laboratory?’. Compatibility determines whether a solution is viable. This article summarises the compatibility status with current mainstream mass spectrometry platforms and outlines the essential checks that must be carried out prior to installation.

The three major mainstream platforms for which compatibility has been confirmed

Neo Source INSTRUMENT’s MSI DPI (20–200 μm) and MSI LDPI (2–3 μm) imaging sources have been successfully adapted for compatibility with the three major mass spectrometry platforms: Agilent, AB SCIEX and Thermo. These three platforms cover the majority of existing instruments in research and quality control settings, and are the brands most frequently found on users’ shortlists. The compatibility work involved verification of mechanical interfaces, vacuum ports and data acquisition protocols.

It is important to emphasise that ‘completing platform-level compatibility’ is a prerequisite, not the end goal. Even within the same brand, instruments from different series or manufactured in different years may still differ in terms of sample port structure, vacuum flanges and software versions. When it comes to a specific instrument, it is still necessary to verify each unit individually by model.

Why verify each unit individually rather than applying a generic model?

Mass spectrometer sample ports are not entirely standardised. Even within the same brand, interface dimensions, vacuum chamber openings and the position of the ion transfer tube may vary across different generations. For an imaging source to operate stably, it is essential to ensure precise spatial alignment between the desorption/ionisation zone and the mass spectrometer’s ion inlet, whilst ensuring that the vacuum load remains within the instrument’s tolerable limits. These parameters can only be confirmed by consulting the configuration specifications for the specific model.

Software protocols are another aspect that is often overlooked. Imaging requires a raster scan of the sample surface, and the scan control must be synchronised with the main unit’s acquisition trigger. If the main unit’s software protocol is closed and cannot interface with external scan control, the imaging process will not function even if the hardware interfaces match. Verifying the protocol in advance can prevent the awkward situation of ‘the hardware being installed but the scan failing to start’.

How to handle other brands

For brands other than Agilent, AB SCIEX and Thermo, compatibility cannot be assumed—nor can it be ruled out. The prudent approach is to provide the instrument model, photographs of the injection port and the software version, so that the supplier can assess the interfaces and vacuum configuration on a case-by-case basis. This ‘case-by-case’ verification is a more accurate reflection of real-world workflows than a blanket promise of ‘compatibility with all instruments’.

Compatibility verification checklist

When submitting instrument information, it is advisable to provide the following four items: brand and specific model, photographs of the injection port and vacuum flange, mass spectrometer type (TOF / orbitrap / triple quadrupole, etc.), and the version of the data acquisition software. The supplier will use this information to determine the mechanical configuration, vacuum adaptation method and scan control integration path. Ensure everything is verified before placing an order; this will make the subsequent installation and commissioning process much smoother.

The value only becomes apparent once compatibility is confirmed

Once compatibility is confirmed, the advantages of retrofitting an imaging source are clear: existing instruments need not be replaced, standard mass spectrometry functions are retained, whilst MSI capability is gained. For laboratories with limited budgets or where space is at a premium, this ‘one instrument, two uses’ approach offers greater flexibility than purchasing a complete new system. Compatibility is the gateway to this approach; ensuring it is verified thoroughly will ensure that the subsequent process runs smoothly.

Summary

The adaptation of mass spectrometry imaging ion sources centres on existing instruments from the three major platforms—Agilent, AB SCIEX and Thermo—but each unit still requires individual verification of mechanical, vacuum and software protocols. By addressing compatibility issues upfront, both the success rate of retrofitting schemes and the speed of commissioning will be significantly improved.