研究目的
Investigating the nature of the cooperativity effect of hydrogen bonds in Watson & Crick and wobble base pairs formed with thymine, uracil and its 5-halogenated derivatives through SERS and chemometric tools.
研究成果
The study revealed remarkable differences between Watson & Crick and wobble pairs, with a stronger cooperativity effect in Watson & Crick pairs. The behavior was correlated to the withdrawing character of different substituents at the 5-position of uracil. A novel indirect methodology for quantifying 5-bromouracil was designed, achieving low LOD values in the presence of interferences.
研究不足
The study is limited by the need for aqueous medium and the low solubility of the compounds under study. The technique's sensitivity is a condition and a limitation at the same time.
1：Experimental Design and Method Selection:
SERS technique over nanostructured colloidal gold assisted by chemometric approaches.
2：Sample Selection and Data Sources:
Mixtures containing from 1 to 5 compounds (T, U, 5-FU, 5-ClU, 5-BrU) were prepared and then separately mixed with A and G to form their respective W&C or wobble pairs.
3：List of Experimental Equipment and Materials:
Chloroauric acid, guanine, adenine, thymine, 5-fluorouracil, 5-chlorouracil, 5-bromouracil, anhydrous sodium citrate, sodium chloride, Milli-Q water.
4：Experimental Procedures and Operational Workflow:
Gold nanoparticles synthesis, mixtures preparation, spectral acquisition using a Renishaw inVia confocal microscope equipped with a 785 nm laser.
5：Data Analysis Methods:
MCR-ALS, PCA, PLS, and iPLS models for data processing and analysis.
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