| dc.description.abstract | The flavonol glycosides belong to a large group of flavonoids diverse in chemical
structures and properties. In plants, these compounds are usually in O-glycosides with common
quercetin or myricetin aglycon. Quercetin is generally the most abundant and prominent
component. Flavonols and flavone glycosides were common cloves chemotypes with potential
natural antioxidants. The changes and antioxidant capacities of flavonol glycosides during the
flowering stages of clove (FS-1 to FS-4) were investigated. Identifications of flavonol
glycosides constituent, total phenolic, flavonoids, and antioxidant capacities were evaluated the
extracts generated in every stage of clove flowers formation. The experiment showed various
concentrations of flavonols (quercetin, quercetin-3-O-glycoside, myricetin, myricetin-3-Oglycoside) and flavones (luteolin-7-O-glycoside, apigenin-7-O-glycoside), as the highest
concentration of quercetin-3-O-glycoside was found during the bloom stage (FS-4) at 110.27
μg/g. The blooming stage also had a significantly higher in-vitro antioxidant capacity than FS1, FS-2, and FS-3. Antioxidant activity was based on 1,1-diphenyl-2-picrylhydrazyl (DPPH),
hydroxyl radical (OH•), and superoxide radical (•O2) scavenging. It is suggested as the best
stage in harvesting the cloves for the natural antioxidant source. | en_US |
