Related Experiment Video
Updated: Jan 19, 2026
09:22
Atmospheric-pressure Molecular Imaging of Biological Tissues and Biofilms by LAESI Mass Spectrometry
Published on: September 3, 2010
14.7K
Antireflection Surfaces for Biological Analysis Using Laser Desorption Ionization Mass Spectrometry
Jing Yang1, Hongjun Zhang2, Jia Jia3
1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
Research (Washington, D.C.)
|September 25, 2019
Summary
This study introduces matrix-free Laser Desorption Ionization Mass Spectrometry (LDI-MS) using antireflection metal surfaces. This novel approach enhances biological analysis by eliminating matrix interference and enabling direct sample examination.
Area of Science:
- Analytical Chemistry
- Surface Science
- Biotechnology
Background:
- Laser desorption ionization mass spectrometry (LDI-MS) is crucial for biological analysis but often requires chemical matrices.
- Matrix compounds can interfere with analysis and necessitate sample pretreatment, limiting applications like metabolomics and direct tissue imaging.
- Developing matrix-free LDI-MS methods is essential for simplifying sample preparation and improving analytical accuracy.
Purpose of the Study:
- To investigate antireflection (AR) metal surfaces as substrates for matrix-free LDI-MS.
- To optimize laser fabrication processes for creating specific micro/nanostructures on AR metal surfaces.
- To evaluate the performance of matrix-free LDI-MS for analyzing diverse biological molecules and complex samples.
Main Methods:
- Fabrication of antireflection (AR) metal surfaces using ultrafast laser processing.
- Optimization of surface morphology and micro/nanostructures by tuning laser parameters.
- Analysis of various biological compounds (carbohydrates, drugs, metabolites, amino acids) using matrix-free LDI-MS.
- Direct analysis of metabolites in yeast cells to demonstrate applicability for complex biological samples.
Main Results:
- AR metal surfaces demonstrated high light-to-heat energy conversion efficiency.
- Surface morphology and micro/nanostructures were successfully controlled via laser processing.
- A high UV absorption of 97% facilitated efficient thermal desorption and ionization.
- Successful matrix-free LDI-MS analysis of diverse biomolecules and direct metabolite profiling in yeast cells was achieved.
Conclusions:
- Antireflection metal surfaces are effective substrates for matrix-free LDI-MS.
- Ultrafast laser processing enables tailored surface fabrication for enhanced ionization efficiency.
- This method overcomes matrix interference issues, paving the way for direct analysis in metabolomics and biological imaging.
Related Concept Videos
01:08Matrix-Assisted Laser Desorption Ionization (MALDI)
976
Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
976
01:19MALDI-TOF Mass Spectrometry
6.5K
Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
6.5K
01:12Electrospray Ionization (ESI) Mass Spectrometry
2.2K
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
2.2K
01:24Mass Spectrum: Interpretation
2.7K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
2.7K
01:21Mass Spectrometry: Complex Analysis
1.7K
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
1.7K