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Differentiation between chelated and non-chelated DNA-Pt complexes by atomic absorption spectrophotometry
Biochimica Et Biophysica Acta
|August 18, 1976
Summary
This study examined DNA-platinum complexes using atomic absorption spectrophotometry. Platinum binding differs between chelate and non-chelate complexes, with trans-platinum complexes showing higher absorbance.
Area of Science:
- Coordination Chemistry
- Biochemistry
- Spectroscopy
Background:
- The platinum series, including cis-trans isomers, are investigated for their properties.
- Previous studies explored platinum-DNA interactions, necessitating further investigation into specific complexes.
Purpose of the Study:
- To investigate DNA-platinum complexes formed by various platinum compounds.
- To quantify platinum binding to DNA using atomic absorption spectrophotometry.
- To compare the binding characteristics of different platinum complexes.
Main Methods:
- Formation of DNA-platinum complexes with [Pt(dien)Cl]Cl, cis-Pt(en)Cl2, cis-Pt(NH3)2Cl2, and K2[PtCl4].
- Quantification of platinum binding using atomic absorption spectrophotometry.
- Analysis of platinum fixation to DNA, particularly for trans-Pt(NH3)2Cl2.
Main Results:
- Chelate platinum complexes (cis-Pt(en)Cl2, cis-Pt(NH3)2Cl2, K2[PtCl4]) exhibit consistent absorbance.
- Non-chelate complexes ([Pt(dien)Cl]Cl, trans-Pt(NH3)2Cl2) binding to N7-(Guanine) show approximately double the absorbance of chelate complexes.
- Atomic absorption spectrophotometry successfully monitored platinum fixation to DNA for trans-Pt(NH3)2Cl2.
Conclusions:
- The binding mode of platinum complexes to DNA significantly influences their interaction.
- Atomic absorption spectrophotometry is a viable method for studying platinum-DNA complexation dynamics.
- Results align with previous findings using ionic chlorine liberation procedures.