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Simultaneous Affinity Enrichment of Two Post-Translational Modifications for Quantification and Site Localization

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Variable-angle synchronous fluorescence spectrometry and rank annihilation methods for mixture resolution.

F García Sánchez, M Cedazo, J Lovillo

|August 1, 1996

Summary

Variable Angle Synchronous Spectroscopy (VASS) offers superior fluorescent mixture resolution compared to the Rank Annihilation Method (RAM). VASS provides highly accurate and precise quantitative results for pesticide analysis in complex mixtures.

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Area of Science:

Analytical Chemistry
Spectroscopy
Environmental Science

Background:

Fluorescent mixtures present challenges in quantitative analysis.
Conventional spectrofluorimetry methods can suffer from interferences.
Accurate pesticide detection is crucial for environmental monitoring.

Purpose of the Study:

To evaluate Variable Angle Synchronous Spectroscopy (VASS) for resolving fluorescent mixtures.
To compare the performance of VASS against the Rank Annihilation Method (RAM).
To assess the quantitative accuracy and precision of both methods for pesticide analysis.

Main Methods:

Acquisition of excitation-emission matrices (EEMs) for standard pesticide solutions and mixtures.
Utilizing cyclodextrin-enhanced fluorescence.
Applying VASS and RAM for spectral deconvolution and quantitative analysis.

Main Results:

VASS demonstrated superior precision and accuracy over RAM for quantitative analysis.
Recoveries for ternary mixtures using VASS were high (99-104%).
RAM showed lower recoveries (84-130%) and poorer accuracy.

Conclusions:

VASS is a highly effective technique for the quantitative resolution of fluorescent pesticide mixtures.
VASS offers significant advantages in accuracy and precision compared to RAM.
Careful spectral route selection enhances analyte signal purity and analytical performance.