Red rose (Rosa Crimson Glory) is the main edible rose in China, with the characteristics of high yield and rich in polyphenols, however, the antioxidant properties of polyphenols in it have not been studied enough.In this study, polyphenols were extracted and the stability of rose polyphenols extraction (RPE) was evaluated.The antioxidant capacity of RPE was evaluated using vitamin C, gallic acid, α-tocopherol, butyl hydroxyanisole, terbutyl hydroquinone, tea polyphenol, and EDTA as controls by free radical scavenging ability, metal ion chelating ability, and iron ion reducing ability.Results showed that eight polyphenols were identified from RPE, including cyanidin-3,5-diglucoside, ellagic acid, catechin, quercetin, myricetin, kaempferol, bis-hexahydroxydiphenoyl-glucoside, and gallic catechin, which was stable at pH≤4 and lower than 20 ℃.The obtained RPE showed good antioxidant activity in scavenging ABTS cationic radicals and DPPH free radicals and in the reduction of iron ions.At the same concentration, the antioxidant activity of RPE was stronger than that of the selected 6 kinds of common antioxidants.At the concentration of 0.1 mg/mL, the scavenging rates of RPE on ABTS cationic radicals (7 mmol/L) and DPPH free radicals (0.14 mmol/L) were (89.53±0.09)% and (100±0.00)%, respectively, but the metal ion chelating ability of RPE was lower than that of EDTA.Results show that RPE has strong antioxidant activity, which is expected to provide theoretical and experimental support for its further application.
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