Reaction between DPPH and trans-aconitic acid (TAA) is explained by a joint experimental/theoretical study.
Hydrogen atom abstraction by DPPHborder="0" alt="radical dot" data-inlimg="/entities/rad" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB"> should be located on methylene bridge in TAA.
Trans-aconitic acid (TAA) alone is an antioxidant with low efficiency.
In combination with vitamin C, trolox, gallic, caffeic acids, TAA provides an antioxidant synergistic or additive effect depending on TAA concentration.