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Micro-scaled high-throughput digestion of plant tissue samples for multi-elemental analysis
Thomas H Hansen1, Kristian H Laursen, Daniel P Persson
1Plant and Soil Science Laboratory, Department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark. jks@life.ku.dk.
Plant Methods
|September 29, 2009
Summary
A new micro-scaled microwave digestion method accurately analyzes elemental profiles in small plant samples. This high-throughput technique improves accuracy and efficiency for plant research and breeding programs.
Area of Science:
- Analytical Chemistry
- Plant Science
- Biogeochemistry
Background:
- Quantitative elemental analysis requires complete sample digestion, a challenge for small or low-concentration samples.
- Accurate multi-elemental analysis using inductively coupled plasma (ICP) spectrometry necessitates efficient sample preparation.
- Limited sample quantities and low elemental concentrations demand digestion in minimal volumes with reduced dilution and contamination.
Purpose of the Study:
- To develop and optimize a micro-scaled microwave digestion procedure for accurate elemental profiling of plant materials.
- To validate the novel method using certified reference materials and compare results with conventional large-volume digestion techniques.
- To enable high-throughput analysis of small plant samples for applications in mutant screening and elemental distribution studies.
Main Methods:
- Development of a micro-scaled microwave digestion procedure utilizing a 64-position rotor with 5 ml disposable glass vials.
- Optimization of the digestion protocol for plant materials ranging from 1-20 mg dry weight.
- Validation using certified reference materials (CRMs) with diverse matrices (starch, lipid, protein) and analysis of single rice grains and Arabidopsis seeds.
Main Results:
- The micro-scaled method was successfully validated for accurate elemental profiling of plant materials.
- Elemental profiles of single rice grains and small batches of Arabidopsis seeds closely matched conventional large-volume digestion results.
- Analysis of rice grain fractions demonstrated that accumulated elemental contents accurately reflected the whole grain content.
Conclusions:
- A high-throughput, micro-scaled digestion method was developed for elemental profiling of small plant samples using ICP-spectrometry.
- The method serves as a valuable tool for screening plant mutants, transformants, and studying elemental distribution in plant organs.
- This advancement offers higher capacity, reduced labor and costs, less contamination, and improved analytical accuracy compared to existing methods.
