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Quantitative temperature gradient focusing performed using background electrolytes at various pH values.

Jonathan G Shackman1, Matthew S Munson, Cheuk-Wai Kan

  • 1Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8394, USA.

Electrophoresis
|September 1, 2006
PubMed
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Temperature gradient focusing (TGF) effectively concentrates and separates samples across a broad pH range (3.0-10.5). This study details methods for predicting buffer suitability and demonstrates quantitative TGF performance with fluorescent analytes.

Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Temperature gradient focusing (TGF) is a practical method for sample concentration and separation.
  • Previous studies established TGF's utility for various sample types.

Purpose of the Study:

  • To demonstrate the applicability of TGF across a wide pH range.
  • To develop methods for predicting buffer suitability for TGF.
  • To quantitatively assess TGF performance in diverse buffer conditions.

Main Methods:

  • Experimental assessment of buffer suitability for TGF using fluorescent analytes.
  • Simultaneous concentration and separation of analytes with varying concentrations.
  • Analysis of peak area linearity with input dye concentration.
  • Determination of resolution (Rs) between analytes.

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Main Results:

  • TGF was successfully conducted quantitatively in background electrolyte (BGE) solutions from pH 3.0 to 10.5.
  • Peak area demonstrated a linear relationship with input dye concentration, indicating quantitative performance.
  • High resolution (Rs > 3) was achieved for fluorescein and carboxyfluorescein, and two LysoSensor-based dyes.
  • Methods for first-order prediction of BGE suitability for focusing were discussed.

Conclusions:

  • TGF is a versatile technique applicable over an extensive pH range, broadening its utility in analytical chemistry.
  • The developed methods allow for effective prediction and assessment of buffer suitability for TGF.
  • Quantitative and high-resolution separation of fluorescent analytes is achievable using TGF across diverse pH conditions.