Antioxidant and anti-inflammatory properties of flavonoids from lotus plumule
Gui-Lin Chen1, Min-Xia Fan2, Jian-Lin Wu3
1Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, China.
Abstract:
The antioxidant and anti-inflammatory mechanisms of action of flavonoids in lotus plumule were systematically analyzed using radical scavenging assays and ELISA kits. By this means, flavonoids displayed significant antioxidant activity by donating electron, H atom as well as capturing DPPH and ABTS+ free radicals, and anti-inflammatory effect by inhibiting the production of the inflammatory mediators (NO radicals, PGE2 and TNF-α) and pro-inflammatory cytokines (IL-1β and IL-6). Meanwhile, the bioactive components against inflammation targeting COX-2 were also revealed using ultrafiltration coupled to LC-MS (UF-LC/MS). In this way, 12 components showing specific binding to COX-2 were screened out and identified. The structure-activity relationships suggested that flavonoids O-glycosides displayed comparable binding affinities to COX-2 compared with flavonoids C-glycosides and could be considered as the main active components. This study will provide valuable information for the further exploration of lotus plumule as functional foods or in pharmaceutical industries in the near future.
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