Investigations on Antioxidant Potential of Phenolic Acids and Flavonoids: The Common Phytochemical Ingredients in Plants

Polyphenol Profile, Antioxidant and Hypoglycemic Activity of Acalypha hispida Leaf Extract

“…The results of the DPPH antioxidant assay are shown in active [27] . The strong antioxidant activity of the extract may be correlated with the presence of the flavonoid compounds, such as kaempferol, quercetin, and rutin [28] ; it may also be attributed to the presence of gallic acid and rosmarinic acid in the extracts [29,30] . The IC 50 value (<10 µg/ml) of the ethanol and aqueous extracts in the present study was lower than that of the IC 50 value of the ethanol (14 µg/ml) and aqueous (17 µg/ml) extracts reported in a previous study [31] .…”

Biologically Active Compounds of Plants: Structure-Related Antioxidant, Microbiological and Cytotoxic Activity of Selected Carboxylic Acids

“…Additionally, BA did not show radical scavenging activity against ABTS •+ radical cation [ 70 ] or it was extremely low (<1%) [ 90 ]. p -CA revealed moderate radical scavenging activity equal 51.7% [ 84 ], and its minimal IC 50 value reported by Singh et al [ 91 ] was 50.0 µmol/L. However, Villaño et al [ 62 ] indicated that p -CA did not show the scavenging activity against ABTS •+ .…”

“…A review of the literature showed that there are only a few papers in which antioxidant capacity of two out of six carboxylic acids described in this work were tested under the same experimental conditions. The results obtained by Masek et al [ 84 ] and Singh et al [ 91 ] showed that p -CA exhibited higher ABTS radical scavenging activity comparing to CFA. However, these results are in contrary to the results obtained by Villaño et al [ 62 ], who found that CFA demonstrated higher antioxidant activity than p -CA.…”

“…The antioxidant activity of p -CA and CFA obtained by CUPRAC assay at room temperature [ 116 ] was higher than that achieved at enhanced (50 °C) temperature [ 66 ]. Moreover, different values were reported for the antioxidant activity of p -CA and CFA estimated by using the same experimental protocols of ABTS and DPPH [ 91 , 99 ] and by FRAP and CUPRAC methods [ 84 ]. It is obvious that the lack of standardized analytical methods for examination of antioxidant capacity and clear and comparable ways of expressing measurement results leads to the inconsistency of the reported data.…”

The impact of the co‐exposure of melanoma cells to chlorogenic acid and a moderate‐strength static magnetic field

“…Phenolic compounds such as chlorogenic acid, CGA, constitute an important group of antioxidants that are found in foods of a plant origin (Singh et al., 2018). Phenolic acids and their derivatives, which are bioactive components of the human diet, are signal molecules that transfer information from the external environment that affects the level of gene expression in cells.…”