Study on Identification and Antioxidant Activity of Phenolic Contents from the Flower of Lagerstroemia speciosa Pers.
Report the use of single-factor and orthogonal array design methods to optimize the integrated ultrasonic assisted extraction of phenolic contents in the flower of Lagerstroemia speciosa Pers.The optimal technological conditions for extracting phenolic contents in the flower of Lagerstroemia speciosa Pers.were as follows:ethanol concentration of 70% ,the ratio of material to solvent of 1:70(g/mL),extraction temperature of 45 ℃ and extraction time of 20 min.DPPH,ABTS and FRAP methods were used to determine the antioxidant activities of phenolic contents in the flower of Lagerstroemia speciosa Pers.,and Folin-Ciocaheu method was used to determine the total phenolic contents(TPC).The phenolic contents in the flower of Lagerstroemia speciosa Pers.were identified by UPLC-ESI-Q-TOF-MS/MS.The results indicated that phenolic contents in the flower of Lagerstroemia speciosa Pers.were significant sources of antioxidants in terms of their antioxidant activities and total phenolic contents.
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