Determination of Melting Point of Galangoisoflavonoside by Open Capillary Method (CAT#: STEM-PPA-0080-YJL)

Introduction

Galangoisoflavonoside was isolated from the rhizomes of Alpinia galanga. Methanolic extract of Alpinia galanga was subjected to column chromatography and eluted with ethyl acetate-methanol (9:1) to yield compound (AG 12) Galangoisoflavonoside. The structure of newer compound was elucidated by various spectral techniques (UV, IR, 1 HNMR, 13 CNMR, and MS). Chemical investigation of the methanolic extract of the rhizomes of Alpinia galanga furnished a new flavonoid (AG 12) Galangoisoflavonoside.

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Principle Applications Procedure Materials Notes Related Products

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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