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Second-harmonic imaging of plant polysaccharides.
Guy Cox1, Nuno Moreno, José Feijó
1University of Sydney, Electron Microscope Unit, NSW 2006, Australia. guy@emu.usyd.edu.au
Journal of Biomedical Optics
|May 25, 2005
Summary
Second-harmonic generation (SHG) microscopy can image starch in plants and food products. However, imaging cellulose requires high laser power, limiting live-cell applications.
Area of Science:
- Plant science
- Microscopy
- Biomaterials
Background:
- Second-harmonic generation (SHG) microscopy is underexplored for plant material analysis.
- Plant polysaccharides like cellulose and starch are crucial biologically and commercially.
- Lignin is a key component of plant cell walls.
Purpose of the Study:
- To investigate the potential of SHG microscopy for plant polysaccharide identification and characterization.
- To assess the feasibility of using SHG microscopy for live plant cell imaging.
- To explore applications in food product analysis.
Main Methods:
- Application of second-harmonic generation (SHG) microscopy.
- Imaging of cellulose, starch, and lignin in plant materials.
- Varying laser powers and fluences to optimize imaging conditions.
- Assessment of cell viability during imaging.
Main Results:
- Cellulose imaging necessitates high laser powers, exceeding optimal levels for live cells.
- Starch is readily imaged at laser fluences compatible with cell viability.
- SHG microscopy shows potential for analyzing starchy food products.
- Lignin exhibits strong three-photon excited fluorescence, potentially enhanced by resonance.
Conclusions:
- SHG microscopy is suitable for imaging starch in plants and food products.
- High laser power requirements limit SHG's utility for live-cell cellulose imaging.
- Further research into lignin's optical properties using multiphoton microscopy is warranted.