Synthesis of polyhydroxylated aromatic mandelic acid amides and their antioxidative potential
摘要:
Six hydroxymandelic acid amides of phenolic amines were synthesized by condensation of 3,4-dihydroxymandelic or 4-hydroxy-3-methoxymandelic acid N-succinimidyl esters and several phenolic benzylamino and phenethylamino hydrochlorides in moderate to good yield. The radical scavenging activities determined by 2,2-diphenyl-1-picrylhydrazyl assay and superoxide trapping assay were superior compared to standards L-ascorbic acid, a-tocopherol, and butylated hydroxytoluene (BHT). The antioxidative activities tested by accelerated autoxidation of bulk Lipids were 2-3.5 times more potent compared to standards alpha -tocopherol and BHT. 3,4-Dihydroxymandelic acid dopamide (4b) and 4-hydroxy-3-methoxymandelic acid dopamide (4a) showed the best overall performance as antioxidants. (C) 2001 Elsevier Science Ltd. All rights reserved.
The present invention relates to hydroxymandelic acid amides of phenolic amines which can be used as antioxidants or as free-radical scavengers, particularly in the cosmetic or dermatological field, in foods and in cosmetic and dermatological compositions.
Hydroxymandelsäureamide phenolischer Amine können als Antioxidantien oder als Radikalfänger, insbesondere auf dem kosmetischen oder dermatologischen Gebiet, in Nahrungsmitteln sowie in kosmetischen und dermatologischen Zusammensetzungen verwendet werden.