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. 2017 Apr 19;7:46501. doi: 10.1038/srep46501

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Copyright © 2017, The Author(s)

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Antioxidant interactions among antioxidant compounds of O. fragrans flowers and green tea before (A,B) and after (C,D) the simulated digestion. Surface responses of joint effect for each pair of the 45 antioxidant combinations in DPPH assay under different hypotheses. R: radical scavenging activity in DPPH antioxidant assay fitted into interaction model Eq. (4). R’: radical scavenging activity in DPPH antioxidant assay fitted into null interaction model Eq. (3). Response surfaces consist of experimental results (points) and fittings to the models (surfaces). Numerical results of RUV were shown in Table 2. Act: actoside; IsoAct: isoacteoside; ChA: chlorogenic acid; CA: caffeic acid; C: catechin; EGCG: (−)-Epigallocatechin gallate; EC: L-Epicatechin; ECG: (−)-Epicatechin gallate; EGC: (−)-Epigallocatechin; GA: gallic acid; GC: (−)-gallocatechin; GCG: (−)-Gallocatechin gallate.