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Determination of Melting Point of 3-aryl-(aralkyl)-8-hydrazinemethylxanthines and Their N-substituted Derivatives by Capillary Method (CAT#: STEM-PPA-0055-YJL)

Introduction

The most wide spread drugs are those, which contain in their structures heterocyclic fragment. Such trend could be explained by the fact that, heterocycle containing compounds are the part of the number of substances, which play an important role in the metabolic processes. It should be noted, that most of these drugs have unpleasant side effects and some of them are rather toxic. Xanthine derivatives are low toxic natural compounds with wide spectrum of pronounced pharmacological properties (antioxidant, diuretic, antibacterial, anti-infl ammatory etc.) and high variability of chemical modifi cation, that make these compounds handy objects for pharmaceutical research. Thus, synthesis of novel less toxic biologically active compounds – potential medicines – by chemical modifi cation of well-known natural substances, is one of the most important tasks of modern pharmaceutical science. It is of great significance to develop synthetic methods for 3-aryl(aralkyl)-8-hydrazinemethylxanthines and their N-substituted derivatives and study their physical and chemical properties.




Principle

Melting point is a characteristic property of solid crystalline substance. It is the temperature at which the solid phase changes to the liquid phase. This phenomenon occurs when the substance is heated.
The melting point measurement is usually performed in thin glass capillary tubes with an internal diameter of 1 mm and a wall thickness of 0.1 – 0.2 mm. A finely-ground sample is placed in the capillary tube to a filling level of 2 – 3 mm and introduced in a heated stand (liquid bath or metal block) in close proximity to a high accuracy thermometer. The temperature in the heating stand is ramped at a user-programmable fixed rate. The melting process is visually inspected to determine the melting point of the sample.

Applications

Chemical industry; Cosmetic/pharmaceutical industry

Procedure

1. Seal capillary.
2. Fill the sample.
3. Install the instrument.
4. Determine the melting point.

Materials

• Sample Type: crystalline compounds