The In Vitro Antioxidant Activity and Inhibition of Intracellular Reactive Oxygen Species of Sweet Potato Leaf Polyphenols

Table 3

Antioxidant activity of individual phenolic compounds from sweet potato leaves.

Samples	·O2^− scavenging activity (μg·ACE/mL)	Oxygen radical absorbance capacity (μg·TE/mL)
SPLP	30.56 ± 2.59	33.72 ± 2.61
CA	51.12 ± 5.35	56.78 ± 4.12
3-CQA	22.97 ± 2.81	41.23 ± 1.06
4-CQA	19.36 ± 1.45	39.15 ± 1.58
5-CQA	20.12 ± 2.79	42.58 ± 3.66
3,4-CQA	20.68 ± 1.55	39.91 ± 8.37
3,5-CQA	21.69 ± 1.42	35.21 ± 2.11
4,5-CQA	22.14 ± 2.15	42.16 ± 3.89
3,4,5-CQA	15.03 ± 1.12	32.21 ± 1.62

The concentration of all tested samples was 10 μg/mL; SPLP: total polyphenols from sweet potato leaves; CA: caffeic acid; 3-CQA: 3-O-caffeoylquinic acid; 4-CQA: 4-O-caffeoylquinic acid;5-CQA: 5-O-caffeoylquinic acid; 3,4-CQA: 3,4-di-O-caffeoylquinic acid; 3,5-CQA: 3,5-di-O-caffeoylquinic acid; 4,5-CQA: 4,5-di-O-caffeoylquinic acid; 3,4,5-CQA: 3,4,5-tri-O-caffeoylquinic acid. Data in the same column that were significantly different were represented by different letters ().