In the SI, the. angle of optical rotation is expressed in radians (rad). The optical rotation is measured on a layer of suitable thickness (optical path length. l. ) at the wavelength Î». and temperature T specified in the monograph. A typical optical path length is 100 mm, the most common. wavelength is 589 nm (Sodium D-Line), while the reference temperature is usually between 20-25 Â°C.
Cetearyl, Cetyl, Myristyl and Behenyl Alcohols are straight-chain alcohols. Isostearyl Alcohol is a branched chain alcohol. Cetearyl Alcohol is a mixture of mostly of Cetyl and Stearyl Alcohols, which are fatty alcohols that occur naturally in small quantities in plants and animals. Myristyl Alcohol is a 14 carbon chain. Cetyl Alcohol has 16 carbons, while Stearyl and Isostearyl Alcohols have 18 carbons.
Alcohol, or ethyl alcohol (ethanol), refers to the intoxicating ingredient found in wine, beer and hard liquor. Alcohol arises naturally from carbohydrates when certain micro-organisms metabolize them in the absence of oxygen, called fermentation. Beer, wine and other liquor contain different amounts of alcohol. The amount of alcohol in distilled liquor is known as ?proof?. Proof refers to the amount of alcohol in the liquor; for example, 100 proof liquor contains 50% alcohol, 40 proof liquor contains 20% alcohol, and so on.