The following are the important characteristics of a solution: Advantages The advantages of a solution are as follows: Disadvantages The disadvantages in using a solution are as follows:
Learning Objectives A solution is a homogenous mixture composed of only one phase. In such a mixture, a solute (drug substance) is dissolved in another substance, called a solvent. The concentration of a solute in a solution is a measure of the amount of solute dissolved in that solvent.
Labeling of Powders and Granules The following information should be there in the labels of powders and granules: Storage Conditions
Pharmaceutical powder particles range from about 10 mm in diameter to 1 micron or less. Particle size analysis is helpful in the determination of size, shape, distribution of drug and other components used in pharmaceutical formulations. Powder particle size influences a various physical and physiological factors. They are as follows: Methods of particle size analysis
Granules are agglomerates of powders. Depending upon the application, various granules of different size can be prepared. The usual size ranges of granules are in the range of 4–12 sieve. Advantages of Granules
In the preparation of powders, some special modifications are followed for incorporation of some of the substances. The modified procedures are as follows:
The classification of powders is as follows:
Learning Objective A powder is a homogenous mixture of more or less finely divided particulate material in dry form. Although the use of powders as a SDF has declined yet they are the starting material in the manufacture of many dosage forms. Powders are one of the oldest dosage forms and are used both internally…
Wet Seal Cachets They are made up of two similar convex halves having flat edges. The weighed amount of powder is placed in one half. The edges of the other are moistened with water and placed exactly over the first half containing the powder. Edges of both the halves are pressed together so as to…