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Determination of Melting Point of Coumarin Derivatives by Open Capillary Method (CAT#: STEM-PPA-0101-YJL)

Introduction

Coumarin has clinical medical value by itself, as an edema modifier i.e. anti-inflammatory activity. Coumarin and other benzopyrones, such as 5,6 benzopyrone, 1,2 benzopyrone, diosmin and others are known to stimulate macrophages to degrade extracellular albumin, allowing faster resorption of edematous fluids. Coumarin is also used as a gain medium in some dye lasers. Coumarin has appetitesuppressing properties, suggesting one reason for its widespread occurrence in plants, especially grasses and clovers, is because of its effect of reducing the impact of grazing animals. Coumarin is used in the pharmaceutical industry as a precursor molecule in the synthesis of a number of synthetic anticoagulant dicoumarol, notably warfarin (which has a common and confusing brand name Coumadin) and some even more potent rodenticides that work by the same anticoagulant mechanism.




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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