Skip to main content

Table 1 Antioxidant activities of the turmeric extracts before and after gastrointestinal digestion

From: In vitro gastrointestinal digestion of a bisdemethoxycurcumin-rich Curcuma longa extract and its oral bioavailability in rats

Digestive phase Standardized C. longa extract Regular turmeric extract p value#
DPPH radical scavenging (%)
Undigested 5.77 ± 1.21 10.65 ± 0.71 0.004**
Gastric 27.33 ± 0.46 28.43 ± 1.55 0.304
Intestinal 9.31 ± 1.07 11.96 ± 1.91 0.104
Digestive phase Standardized C. longa extract Regular turmeric extract p value*
ABTS cation scavenging (%)
Undigested 25.71 ± 1.37 23.69 ± 2.47 0.283
Gastric 15.29 ± 1.87 14.43 ± 0.60 0.492
Intestinal 67.36 ± 2.20 61.58 ± 1.36 0.018*
Nitric oxide scavenging (%)
Undigested 62.20 ± 5.98 25.89 ± 3.4 < 0.001***
Gastric 49.11 ± 3.82 64.01 ± 4.38 0.011*
Intestinal 45.55 ± 3.86 18.86 ± 5.24 0.002**
Superoxide radical scavenging (%)
Undigested 36.98 ± 0.83 24.35 ± 0.62 < 0.001***
Gastric 86.47 ± 2.14 87.28 ± 0.91 0.576
Intestinal 72.58 ± 0.85 68.94 ± 2.17 0.054
  1. The values are presented as mean ± standard deviation of three independent experiments. #Independent t test. *p < 0.05; **p < 0.01; ***p < 0.001