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Determination of Melting Point of 4-Substituted Semicarbazones Of Levulinic Acid by Capillary Method (CAT#: STEM-PPA-0115-YJL)

Introduction

Epilepsy is a common disorder of the central nervous system (CNS). Approximately 0.4%~1% of the population worldwide suffers from this disorder. The conventional antiepileptic drugs suffer from a range of side effects. Furthermore, the convulsions of 25% of epileptics are inadequately controlled by currently available medications. During the past decade several new drugs were approved, e.g., felbamate, fosphenytoin, gabapentin, lamotrigine, vigabatrin and zonisamide. However none of the available antiepileptic drug is ideal as they can be associated with chronic and adverse side effects. Thus the search for new anticonvulsant drugs continues to be an active area of investigation in medicinal chemistry. Aryl semicarbazones have recently acquired an im-portant place as anticonvulsants and can be consid-ered a new class of compounds with anticonvulsant activity.




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.
In all major pharmacopoeias the open capillary method is described to determine the melting point (slip point) for fats, fatty acids, paraffin, and waxes. In a glass capillary tube open at both ends (1), 10 mm of sample is introduced (2), chilled to a given temperature and immersed into a water bath (3/4). The melting point with open capillary, also known as slip point or slip melting point, is the temperature at which the substance begins to rise in the capillary due to the effect of the increasing temperature and buoyancy.

Applications

Chemical industry; Cosmetic/pharmaceutical industry

Procedure

1. Prepare the substance.
2. Affix one of the capillaries to a thermometer.
3. Place the thermometer with an affixed capillary into a glass.
4. Increase the temperature.

Materials

• Sample Type: crystalline compounds
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