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Quantitative Analysis01:12

Quantitative Analysis

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Quantitative analysis is a technique for measuring the amount of specific constituents in a sample. When the sample's composition is unknown, qualitative analysis is performed first to identify its components, which ensures that the correct substances are measured during the quantitative phase.
In quantitative analysis, two key measurements are made: the sample quantity and a property proportional to the amount of the analyte (the substance being analyzed). This forms the basis of the...
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Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

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Resonance

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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Enthalpy of Solution

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There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
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Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Advancing Integrating-Sphere-Assisted Resonance Synchronous Spectroscopy for Quantitative Absorbance Analysis in

Joshua McEachin1, Pathum Wathudura1, Huy Pham1

  • 1Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States.

Analytical Chemistry
|February 13, 2026
PubMed
Summary
This summary is machine-generated.

Integrating-Sphere-Assisted Resonance Synchronous (ISARS) spectroscopy now quantifies UV-vis absorbance in highly turbid solutions. This enhanced technique expands spectral range and dynamic range, enabling reliable measurements in complex samples like milk.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Biophysical Chemistry

Background:

  • Conventional UV-vis spectrophotometry struggles with turbid solutions due to scattering.
  • Integrating-Sphere-Assisted Resonance Synchronous (ISARS) spectroscopy offers an alternative for turbid samples.
  • Existing ISARS methods had limitations in spectral range, dynamic range, and sample volume sensitivity.

Purpose of the Study:

  • To enhance the capabilities of ISARS spectroscopy for broader applications.
  • To overcome limitations of spectral range, linear dynamic range, and sample volume variations.
  • To enable accurate absorbance quantification in optically complex media.

Main Methods:

  • Expanded spectral range to 250-750 nm using neutral-density-filter (NDF) strategy.
  • Extended linear dynamic range using short-path cuvettes and direct "first-strike" geometry.
  • Developed polynomial models and a Python GUI for data analysis and conversion to double-beam values.

Main Results:

  • Achieved a significantly expanded usable spectral range (250-750 nm).
  • Enabled reliable quantification of protein absorbance in undiluted commercial milks (optical density > 150).
  • Demonstrated ISARS's unique capability in solutions with extremely high scattering.

Conclusions:

  • The enhanced ISARS method overcomes critical limitations of the original technique.
  • ISARS is now a powerful and accessible platform for absorbance analysis in optically complex media.
  • This advancement opens new possibilities for analyzing challenging biological and industrial samples.