Syringic acid is correlated with high antioxidant activity and inhibition of LDL oxidation.
Syringic acid is a phenol present in some distilled alcohol beverages. It is also a product of microbial (gut) metabolism of anthocyanins and other polyphenols that have been consumed[1]. Research suggests that phenolics from wine may play a positive role against oxidation of low-density lipoprotein (LDL), which is a key step in the development of atherosclerosis. Syringic acid is correlated with high antioxidant activity and inhibition of LDL oxidation[2].
References:
[1]. Forester SC, et al. Identification of Cabernet Sauvignon anthocyanin gut microflora metabolites. J Agric Food Chem. 2008 Oct 8;56(19):9299-304.
[2]. Kalkan Yildirim H, et al. Protection capacity against low-density lipoprotein oxidation and antioxidant potential of some organic and non-organic wines. Int J Food Sci Nutr. 2004 Aug;55(5):351-62.