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The Characterization of Pharmaceutical Formulations and Drug Delivery Systems by Isothermal Titration Calorimetry (ITC) (CAT#: STEM-MB-2519-LGZ)

Introduction

Isothermal titration calorimetry (ITC) has long been regarded as the "method of choice" for characterizing the thermodynamics and stoichiometry of molecular interactions, with high sensitivity, and has been applied in many fields of pharmaceutical analysis. ITC can be used to measure binding thermodynamics and their use for pharmaceutical formulations and drug delivery system characterization particularly cyclodextrin–guest interactions, investigation of micellar-based systems, polyelectrolytes, nucleic acid interactions with multivaluing optimal cations and the




Principle

A reactant is placed in a temperature-controlled sample cell and coupled to the reference cell through a thermocouple loop. The sample cell and the reference cell are in the same external environment. A specific titration agent (selected as required by the test) is added to the sample cell quantitatively. The change in energy in response can be sensitively detected and triggered by a positive or negative feedback thermostat to keep the temperature constant.

Applications

For characterizing thermodynamic parameters of biomolecular interactions.

Procedure

1. Preparation before the experiment.
2. Add 40ul of ligand or small molecule protein solution to the titration syringe, 200ul of large molecule protein solution to the sample pool, and 200ul of distilled water to the reference pool.
3. Set Experimental Parameters in the interface.
4. In the set up interface, set the storage path of experimental data and experimental methods, as well as the current user.
5. Put the titration syringe into the sample pool and click Start to start the experiment. Display real-time images of the experiment on the Real Time Plot interface.

Materials

• Sample Type: protein 50 micrograms, small molecules 10mM/500ul, the higher the sample concentration is the better, protein peptides need to be sent at low temperature.
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