What is Undecylenic acid?

Undecylenic acid is an organic unsaturated fatty acid derived from castor oil. It is the common name of the 10-undecenoic acid, (CH2CH(CH2)8COOH). It is used in the manufacture of pharmaceuticals, cosmetics and perfumery, including antidandruff shampoos, antimicrobial powders and as a musk in perfumes and aromas.
Uses
Undecylenic acid is a natural fungicide and is FDA approved in over-the-counter medications for skin disorders. It is the active ingredient in medications for skin infections, and relieves itching, burning, and irritation.
Undecylenic acid can be used in silicon-based biosensors. Monolayers can be made on bare silicon transducer surfaces with the help of covalent bonds between silicon atom and the double bonds of undecylenic acid. The carboxylic acid groups remain available for the conjugation of biomolecules such as DNA or proteins.
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