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Correlations between the cumulative mass of phenolic acids ChA, GA, 3,4-DHB and the antioxidant activity (DPPH, ABTS) of the acceptor fluid collected during the 24-h permeation study: (A) DPPH vs. ChA mass, (B) DPPH vs. GA mass, (C) DPPH vs. 3,4-DHB mass, (D) ABTS vs. ChA mass, (E) ABTS vs. GA mass and (F) ABTS vs. 3,4-DHB mass. The correlations are presented only for phenolic acids penetrated to the highest degree.
