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Related Concept Videos

DNA Agarose Gel Electrophoresis02:35

DNA Agarose Gel Electrophoresis

Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
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Two-dimensional Gel Electrophoresis01:22

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Electrical Transport01:29

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The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
Electrical Conductivity01:13

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SDS-PAGE01:27

SDS-PAGE

Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
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Thermal Scanning Conductometry (TSC) as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
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Wet method for measuring starch gelatinization temperature using electrical conductivity.

E Morales-Sanchez1, J D C Figueroa, M Gaytan-Martínez

  • 1CICATA-IPN Unidad Querétaro, Cerro Blanco Nr 141, Colinas del Cimatario, Querétaro, México. eduardo_morales_sanchez@yahoo.com.mx

Journal of Food Science
|November 10, 2009
PubMed
Summary

This study introduces a novel electrical conductivity method to determine starch gelatinization temperatures. The technique accurately measures onset and end gelatinization points for various starches, offering a viable alternative to traditional methods.

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Area of Science:

  • Food Science
  • Materials Science
  • Analytical Chemistry

Background:

  • Starch gelatinization is a critical process in food and material applications.
  • Accurate determination of gelatinization temperatures is essential for process control.
  • Existing methods like DSC can be complex or require specific sample preparation.

Purpose of the Study:

  • To develop and validate a new method for measuring starch gelatinization temperatures using electrical conductivity.
  • To compare the electrical conductivity method with Differential Scanning Calorimetry (DSC).
  • To present a wet method for determining gelatinization parameters in starch-water suspensions.

Main Methods:

  • Native starches (corn, rice, potato, wheat) were suspended in water at varying concentrations.
  • Electrical conductivity was monitored as a function of temperature from room temperature to 90°C.
  • Measurements were compared with results obtained using Differential Scanning Calorimetry (DSC).

Main Results:

  • Electrical conductivity showed a linear relationship with temperature up to the onset gelatinization point.
  • Changes in conductivity after the onset point correlated with starch swelling and gelatinization.
  • The onset and end gelatinization temperatures determined by electrical conductivity closely matched DSC results.

Conclusions:

  • Electrical conductivity provides a reliable and sensitive method for determining starch gelatinization temperatures.
  • This technique offers a practical approach for analyzing starch-water systems.
  • The method is comparable to DSC for evaluating key gelatinization parameters.