Affinity mass spectrometry from a tailored porous silicon surface

Area of Science:

• Materials Science
• Analytical Chemistry
• Biotechnology

Background:

• Desorption/Ionization on Silicon (DIOS) mass spectrometry requires specialized materials for efficient analysis.
• Immobilizing species for on-chip purification and detection presents challenges in bond stability and cleavage.

Purpose of the Study:

• To develop chemically stable porous silicon (pSi) materials suitable for DIOS mass spectrometry.
• To create efficient covalent linkers that can be cleaved by the DIOS laser pulse.
• To enable on-chip affinity purification coupled with mass detection.

Main Methods:

• Synthesis of chemically stable porous silicon (pSi) substrates.
• Development of novel covalent linkers designed for laser-induced cleavage.
• Implementation of methods for efficient immobilization of target species onto pSi surfaces.
• Integration of affinity purification and DIOS mass spectrometry for analysis.

Main Results:

• Demonstrated the chemical stability of developed porous silicon materials under DIOS conditions.
• Successfully utilized covalent linkers that efficiently cleave upon exposure to the DIOS laser pulse.
• Achieved effective on-chip affinity purification of immobilized species.
• Validated the capability for simultaneous mass detection of purified analytes.

Conclusions:

• The developed porous silicon materials and linker strategies are effective for on-chip affinity purification and DIOS mass spectrometry.
• This integrated approach offers a powerful platform for sensitive and specific molecular analysis.
• The technology facilitates streamlined workflows for sample preparation and analysis in various scientific fields.