UPLC-ESI-MS/MS Analysis and Evaluation of Antioxidant Activity of Total Flavonoid Extract from <i>Paeonia lactiflora</i> Seed Peel and Optimization by Response Surface Methodology (RSM)

<div><i>Paeonia lactiflora</i> seed peel extract obtained by optimized ultrasonic-assisted extraction. Peak identification: 1: protocatechuic acid; 2: 3,4-dihydroxybenzaldehyde; 3: gentisic acid; 4: 4-hydroxybenzoic acid; 5: aesculin; 6: catechin; 7: chlorogenic acid; 8: cryptochlorogenic acid; 9: vanillic acid; 10: caffeic acid; 11: syringic acid; 12: aesculetin; 13: epicatechin; 14: 4-hydroxycinnamic acid; 15: transpiceid; 16: rutin; 17: delphinidin 3-glucoside; 18: hesperidin; 19: phlorizin; 20: naringenin. (a) The peak with higher content in the extract. (b) The peaks of other flavonoids in the extract.</div>

BioMed Research International

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Figure 4: UPLC-ESI-MS/MS Analysis and Evaluation of Antioxidant Activity of Total Flavonoid Extract from <i>Paeonia lactiflora</i> Seed Peel and Optimization by Response Surface Methodology (RSM) 

Figure 4 | UPLC-ESI-MS/MS Analysis and Evaluation of Antioxidant Activity of Total Flavonoid Extract from Paeonia lactiflora Seed Peel and Optimization by Response Surface Methodology (RSM) 