Free radical scavenging activities and bioactive substances of Jerusalem artichoke (Helianthus tuberosus L.) leaves

Phytochemical screening, antimicrobial and antioxidant efficacy of different extracts of Rumex dentatus L. – A locally used medicinal herb of Kashmir Himalaya

“…The extracts of this plant scavenged free radicals in a dose-dependent manner corresponding with many studies on R. dentatus and Azadirachta indica [44,45] . These findings are also supported by earlier reports that plant metabolites such as flavonoids, tannins, catechins and other phenolic compounds possess antioxidant activity [46] .…”

Phenolics and antifungal activities analysis in industrial crop Jerusalem artichoke (Helianthus tuberosus L.) leaves

“…According to another report, 3,5-DiCQA (isochlorogenic acid) was found to be active against Rhizopus stolonifer (Stange et al, 2001). We explored the structure-activity relationships of phenolic acids and found that the 3,4-DiCQA and 1,5-DiCQA were two isomers of isochlorogenic acids, with the isomers significantly varying in bioactivity (Yuan et al, 2012). Isomers 3,4-DiCQA and 1,5-DiCQA exhibited higher activities than the other two isomers (3,5-DiCQA and 4,5-DiCQA) (Table 4).…”

“…Hence, the constituents of these two fractions were worth studying further. According to the previous research (Yuan et al, 2012), the main constituents in the leaves of Jerusalem artichoke were chlorogenic and isochlorogenic acids, with chlorogenic acid being effective in inhibiting mycelium growth (Maddox et al, 2010). It remains to be established whether the main antifungal activity in the EA and NB fractions comes from chlorogenic acid or other compounds.…”

“…In addition, previous phytochemical studies have disclosed that effective compounds such as coumarins, unsaturated fatty acids, polyacetylenic derivatives, phenols and sesquiterpenes have been isolated from Jerusalem artichoke (Pan et al, 2009). These Jerusalem artichoke compounds were found to possess antioxidant, antimicrobial, antifungal and anticancer activities (Ahmed et al, 2005;Pan et al, 2009;Yuan et al, 2012;Meng et al, 2012).…”

“…The main constituents in the leaves of Jerusalem artichoke are chlorogenic and isochlorogenic acids that have good antioxidant properties. In general, the activity of phenolics is related to their chemical structures (Yuan et al, 2012); based on structural features of Jerusalem artichoke phenolics, its leaf extracts could exhibit antifungal capacities. However, to the best of our knowledge, antifungal or other antiphytopathogenic activities of Jerusalem artichoke main phenolics have not previously been reported.…”