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Determination of Melting Point of Some New Sulfadiazine Derivatives by Capillary Method (CAT#: STEM-PPA-0116-YJL)

Introduction

The molecular structures of sulfa drugs that containing the 4- aminobenzenesulfonamide moiety play important roles as a chemotherapeutic agent. The biological activity of these drugs is thought to come from the structural similarity between sulfanilamide group and p-amino benzoic acid where the sulpha drug simulators this metabolite and blocks folic acid synthesis in bacteria, thereby causing cell death. Sulfadiazine exhibits in vitro inhibitory activity against several aerobic gram-positive and gram-negative bacteria, Sulfadiazine is one of the medication populace of barbituric acids has concern. Azirine a small heterocyclic ring system are of largest importance in theoretical, synthetic organic, bio organic and medicinal chemistry, and in particular aziridines are very useful and interesting systems as they occur in a sum of accepted and biologically lively substances.




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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