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Determination of Melting Point of Rifampicin by Open Capillary Method (CAT#: STEM-PPA-0074-YJL)

Introduction

Tuberculosis (TB) is one of the most common causes of morbidity and mortality in the world today. Despite all the efforts, the disease is not coming to grip. Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis and rarely by other organisms of the “tuberculosis complex”. It is usually transmitted by inhalation of infected droplet nuclei which are discharged into the air when a patient with untreated sputum positive TB coughs or sneezes. Rifampicin is bactericidal to Mycobacterium tuberculosis and many other Gram positive and gram negative bacteria. The deviation from the melting point of a sample is an indication of the impurities in the sample. A Small amount of Impurity can be determined by lowering as well as the widening of the melting point range. The melting point of Rifampicin was determined by the open capillary method.




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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