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Determination of Melting Point of Lipospheres Formulation by Capillary Method (CAT#: STEM-PPA-0060-YJL)

Introduction

Lipospheres formulation is an aqueous micro dispersion of solid water insoluble spherical micro the lipospheres are prepared of solid hydrophobic triglycerides with a monolayer of phospholipids embedded on the shell of the particle. Repaglinide is a water insoluble ant diabetic drug which belongs to the class of medications known as meglitinides. An attempt was made to develop and characterized the lipospheres in order to enhance the bioavailability of a highly permeable and a poorly soluble anti-diabetic drug by using different concentrations of bees wax, stearic acid, cetyl alcohol, tween 80 and phospholipids coat such as soybean phosphotidylcholine. The lipospheres were prepared by solvent evaporation technique and characterized for particle size, scanning electron microscopy, % entrapment efficiency, % yield, % drug content, in vitro drug release and stability study.




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.
The melting point measurement is usually performed in thin glass capillary tubes with an internal diameter of 1 mm and a wall thickness of 0.1 – 0.2 mm. A finely-ground sample is placed in the capillary tube to a filling level of 2 – 3 mm and introduced in a heated stand (liquid bath or metal block) in close proximity to a high accuracy thermometer. The temperature in the heating stand is ramped at a user-programmable fixed rate. The melting process is visually inspected to determine the melting point of the sample.

Applications

Chemical industry; Cosmetic/pharmaceutical industry

Procedure

1. Seal capillary.
2. Fill the sample.
3. Install the instrument.
4. Determine the melting point.

Materials

• Sample Type: crystalline compounds
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