Hydroxy Acids

Hydroxy Acids

 

(or hydroxycarboxylic acids), organic compounds containing one or more carboxyl (—COOH) and hydroxyl (—OH) groups per molecule. Examples are glycolic acid, HOCH2COOH; α-hydroxypropionic (lactic) acid, CH3CH(OH)COOH; and β-hydroxypropionic (hydracrylic) acid, HOCH2CH2COOH. Hydroxy acids are extremely reactive compounds. They readily undergo dehydration upon heating to form various products, depending on structure, as follows: (1) α-hydroxy acids yield lactides (cyclic esters), (2) β-hydroxy acids form unsaturated acids, (3) γ- and δ-hydroxy acids yield inner esters (lactones).

Hydroxy acids may be prepared by oxidation of glycols containing at least one primary –OH group, by saponification of hydroxynitriles, and by reaction of nitric acid and amino acids. Hydroxy acids and their derivatives are widespread in nature. Another commercially valuable hydroxy acid is o-hydroxybenzoic acid (salicylic acid), whose derivatives are used as pharmaceuticals and in the manufacture of azo dyes.

References in periodicals archive ?
Now, with the clinically-proven skin rejuvenation benefits of three Alpha Hydroxy Acids in one complete system, physicians can uniquely customize patient skincare treatment plans for any skin type.
There are fading treatments available, alpha hydroxy acids, retinoids and even chemical peels and laser treatments.
I'm currently using an excellent range of beauty products which include Vitamins C and E and AHAs (alpha hydroxy acids derived from fruits such as papaya, mango and green tea) all of which are wonderfully regenerating for the skin.
Ideal to use morning and evening, it contains alpha hydroxy acids as a mild exfoliator and really gets to work on wrinkly hands.
On April 12, the court rejected Valeant's motion to overturn and issued a permanent injunction prohibiting Valeant from the manufacture, sale and marketing of products covered by the infringed patents, such as the use of alpha hydroxy acids to enhance the therapeutic effect of other substances.
The Exuviance Multi-Protective Lip Balm, pounds 8 (020-7636 0234), uses poly hydroxy acids, the gentle little sister of alpha hydroxy acids, to attract water to the lips and chemically exfoliate dry areas.
Rick and Arlene Noodleman, the husband and wife team specializing in anti-aging dermatology and preventive medicine, respectively, Revercel(R) skin care is an artful combination of proven cosmeceutical ingredients, including peptides, retinols, alpha hydroxy acids, botanicals and anti-oxidants combined to produce results-packed products.
ECZEMA Stay away from drying cleansers, spot creams and alpha hydroxy acids (AHAs).
Many products contain alpha hydroxy acids (AHAs) which work on wrinkles and discolouring by removing the outer layer of the skin.
CONSUMERS have an arsenal of materials, including hydroxy acids, peptides and antioxidants, at their disposal to combat the signs of aging.
The top product containing AHAs is Exuviance Rejuvenating Treatment Masque, pounds 20, a moisturising treatment containing a blend of Alpha hydroxy acids and vitamins.
Manicare's concentrated capsules contain Alpha Hydroxy Acids plus Vitamins A & E and panthenol.