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Novel fluorescent colloids as a DNA fluorescence probe.
Liu Jinshui1, Wang Lun, Gao Feng
1College of Chemistry and Material Science, Anhui Normal University, Wuhu 241000, P.R. China.
Analytical and Bioanalytical Chemistry
|July 25, 2003
Summary
Researchers developed a new method using fluorescent perylene nanoparticles to quantify DNA. This technique offers sensitive detection of fish sperm DNA and calf thymus DNA, enabling precise nucleic acid concentration measurements.
Area of Science:
- Nanotechnology
- Biochemistry
- Analytical Chemistry
Background:
- Fluorescent perylene colloids are synthesized via reprecipitation.
- Cetyltrimethylammonium bromide (CTAB) is used to control nanoparticle size and stability.
- Nanoparticles exhibit interactions with DNA.
Purpose of the Study:
- To develop a novel quantitative method for DNA assay.
- To investigate the use of modified fluorescent perylene nanoparticles for nucleic acid detection.
- To establish detection limits for different DNA types.
Main Methods:
- Preparation of fluorescent perylene colloids (80-90 nm) using reprecipitation.
- Modification of nanoparticles with CTAB to inhibit growth.
- Measurement of fluorescence quenching in the presence of nucleic acids.
- Optimization of conditions for DNA concentration determination.
Main Results:
- Fluorescence intensity decrease of colloid-CTAB correlates with nucleic acid concentration.
- Quantitative detection range established from 0.02-5.1 micro g mL(-1) for fish sperm (FS) DNA and calf thymus (CT) DNA.
- Achieved low detection limits: 0.01 micro g mL(-1) for FS DNA and 0.012 micro g mL(-1) for CT DNA.
Conclusions:
- A new, sensitive quantitative method for DNA assay based on fluorescence quenching of perylene nanoparticles is presented.
- The method demonstrates effective quantification of DNA with high sensitivity.
- The developed approach shows promise for nucleic acid analysis.