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rajibray Classification of powders according to I.P 1) Course powder: Powders of which all particles pass through a sieve with a nominal mesh aperture of 1.70 mm (No. 10 sieve) and not more than 40.0 percent through a sieve with a nominal mesh aperture of 355 μm (No. 44 sieve) is called coarse powder. 2) Moderately … Read more
Principle of ball mill Ball mill: It works on the principle of impact and attrition. Construction of ball mill It consists of a hollow cylinder that is mounted on a metallic frame in such a way, that it can be rotated on its longitudinal axis. The cylinder contains balls that occupy 30-50% of the mill … Read more
Principle of Hammer mill Hammer mill: It works on the principle of impact, i.e. material is more or less stationary and hit by an object moving at high speed. Construction of Hammer mill It consists of a stout metal casing, enclosing a central shaft, to which four or more swinging hammers are attached. The lower … Read more
Preservatives are substances used to prevent the growth of microorganisms and increase the product’s shelf life and stability. These preservatives are used in various pharmaceutical and food products. Types of preservatives It is divided into 2 categories, 1. Based on the Mechanism of Action (a) Anti-oxidants: The agent which prevents the oxidation Eg Vitamin E, … Read more
Sweetening agents: These are the agents that improve the taste of the product by masking the bitter taste of the partially dissolved drug and improving palatability. Types of sweetening agents Uses of sweetening agents 1. It is used pharmaceutical, and food industries. 2. Used to enhance the taste of food products and pharmaceutical dosage forms. … Read more
Definition: coloring agents (or) colorants are a substance that is added (or) applied in order to change the color of a material (or) surface. Also enhancing the appearance. Also read: Different types of metals are used in the pharmaceutical industry. Types of coloring agents used in pharmaceutical formulation 1. Organic dyes and their lakes: Dyes … Read more
What are Aerosols? Aerosol may be defined as a dispersed phase system, in which very fine solid particles or liquid droplets get dispersed in the gas, which acts as a continuous phase. These are also called pressurized dosage forms. Containers used for Aerosol: The aerosol container can be divided into 4 parts, By using a … Read more
Principles and procedures involved in limit test for iron Principle: limit test for iron depends upon the interaction of thioglycolic acid with iron in the presence of citric acid and ammonical alkaline medium, this results in the formation of purple or pink-colored ferrous salt of thioglycolic acid. Procedure Test solution Standard solution Compare the test … Read more