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Determination of Melting Point of β-sitosterol Diglucosyl by Open Capillary Method (CAT#: STEM-PPA-0079-YJL)

Introduction

Alpinia galanga is a perennial herb, which belongs to the Zingiberaceae family, commonly known as Kulingen. Various essential oil constituents, such as, cineole, methyl cinnamate, myrecene, and methyl eugenol are obtained from this plant. This plant is also reported to contain various flavones like galangin, alpinin, kampferide, and 3-dioxy-4-methoxy flavone. Alpinia galanga is attributed with various pharmacological activities such as, antimicrobial, antioxidant, antifungal, anti-cancer, and gastroprotective. The methanolic extract of the rhizomes of plant Alpinia galanga was subjected to column chromatography and was eluted with ethyl acetate-methanol (99:1) to yield compound (AG5) β-sitosterol diglucosyl caprate.

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Principle Applications Procedure Materials

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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