Determination of Melting Point of Nymphasterol by Open Capillary Method (CAT#: STEM-PPA-0097-YJL)

Introduction

Nymphaea stellata is widely distributed in warmer regions of Asian and African continents. The plant is a large perennial aquatic herb with globular fruit, longitudinally striate seeds, flowers solitary usually pale violet, rootstock ovoid, short, acute, leaves peltate. It is mentioned for treatment of liver disorders in Ayurveda, an ancient Indian system of Medicine. The seeds of the plant are still used by Ayurvedic practitioners for diabetes symptomatic disorders and are also considered a powerful stomachic in Indo-China. Flowers are said to be refrigerant and alleviative of cough, bile, vomiting, giddiness, and worms and burning of the skin.

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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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