Optical activity is the ability of a substance to rotate the plane of Plane Polarized Light (PPL). This occurs in molecules that contain a chiral center (a carbon atom bonded to four different groups). This phenomenon is a cornerstone of stereochemistry and is vital in pharmaceutical analysis for identifying drugs and checking their purity. The … Read more
Stereochemistry is the ‘chemistry of space’. It deals with the spatial arrangements of atoms and groups in a molecule. Stereoisomerism is crucial to understand because the spatial arrangement of atoms can completely change a drug’s effect: one isomer might cure a disease, while its “mirror image” could be toxic. It is essential to know about stereoisomerism … Read more
In the analysis of fats and oils, mathematical constants are used to normalize results to a standard sample weight (usually 1 gram or 100 grams). These are used to convert titrant volumes into the weight of the substance being measured. The Constant 56.1 (Saponification & Acid Value) The constant 56.1 is the most frequently used … Read more
The Acetyl Value is an important analytical constant used to determine the concentration of hydroxyl groups (—OH) in a fat, oil, or wax. This is particularly significant for evaluating oils like Castor Oil. It is naturally rich in 18-carbon hydroxylated fatty acid known as ricinoleic acid. Definition The Acetyl Value is defined as the number … Read more
The Ester Value is a critical analytical parameter used primarily to determine the quality and purity of waxes, fats, and essential oils. It is often studied immediately after the Acid value and Saponification value because it is mathematically derived from them. Definition The Ester Value is defined as the number of milligrams (mg) of Potassium … Read more
The Iodine Value (IV), also known as the Iodine Number. It is a fundamental analytical parameter in the analysis of fats and oils. It is a direct measure of the degree of unsaturation (number of double bonds) in a lipid sample. Definition The Iodine Value is defined as the number of grams of iodine absorbed … Read more
The Saponification Value (or Saponification Number) is a critical chemical constant used to characterize and assess the quality of fats and oils. It is essentially a measure of the average molecular weight (or chain length) of all the fatty acids present in a sample. Definition and Units: The Saponification Value is defined as the number … Read more
In the context of surface coatings and chemistry, drying oils are a vital class of materials. Definition Drying oils are liquid vegetable or animal fats that, when exposed to air, undergo a chemical reaction (polymerization) to form a tough, solid and elastic film. Contrary to the name, they do not “dry” through the evaporation of … Read more
In simple words, rancidity is the chemical decomposition of food that contains fats, oils, and other lipids. It happens when these fats react with oxygen or moisture. It results in unpleasant smell, a stale taste, and a change in color. Beyond the sensory changes, rancidity can reduce the nutritional value of food by destroying essential … Read more
Saponification is the chemical process of converting fats or oils into soap and glycerol. Chemically, it is the alkaline hydrolysis of an ester. When a triglyceride (the main component of oil) reacts with a strong base, the ester bonds are broken, releasing glycerol and creating the metal salts of fatty acids, which is known as … Read more