Table 4 Quantification of flavonoids, phenolics, and condensed tannins in hydroalcoholic extracts, along with the Estimation of their free radical-scavenging and antioxidant activities.

From: Chemical composition and in vitro bioactivities of hydroalcoholic extracts from Turnera pumilea, Hyptis lantanifolia, and Ageratina popayanensis cultivated in Colombia

Hydroalcoholic extract

Flavonoidsa

(mg RE/g DT)

Phenolicsb

(mg GAE/g DT)

Condensed tanninsc

(mg CE/g DT)

Scavenging radical (%)

TEACd

T. pumilea

171.2 ± 2.3

238.3 ± 1.3

28.7 ± 0.5

18

105

H. lantanifolia

175.9 ± 2.4

191.3 ± 0.5

22.0 ± 0.7

22

93

A. popayanensis

108.8 ± 0.7

198.0 ± 0.8

43.0 ± 0.2

44

226

  1. (a) A415 = 0.0085x + 0.0084, R2 = 0.9993, rutin curve obtained at concentrations of 0.002–0.125 mg/mL. The total flavonoid content was expressed as milligrams of rutin equivalents per gram of dry tissue (mg RE/g DT). (b) A760 nm=0.0046x + 0.044, R² = 0.9966, gallic acid curve obtained at concentrations of 0.003–0.200 mg/mL. Total phenolic content was expressed as milligrams of gallic acid equivalents per gram of dry tissue (mg GAE/g DT). (c) A500 nm=0.0037x + 0.1181, R²=0.9873, catechin curve obtained at concentrations of 0.0078–1.00 mg/mL. Condensed tannin content was expressed as milligrams of catechin equivalents per gram of dry tissue (mg CE/g DT). Data are the mean ± SEM (n = 3). (d) Evaluation at the concentration of 125 µg/mL. b. TEAC (trolox equivalent antioxidant capacity), y = 0.1753x − 0.9145. R² = 0.9941. The data are presented as the mean ± SEM (n = 2).
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