Abstract
Different species of functional agricultural crops may vary in antioxidant capacities. In this study, the antioxidant activities of methanol extracts from four species of Carya genus were compared by various antioxidant assays, including the reducing power, 1,1-diphenyl-2-pycrylhydrazyl (DPPH) radical scavenging activity and the superoxide anion scavenging activity. The reducing power of extracts from Carya dabieshanensis, Carya cathayensis, Carya hunanensis and Carya illinoensis were 0.246, 0.237, 0.22 and 0.073 at the concentration of 0.50 mg/ml, respectively. The scavenging effect on the DPPH radical (IC50) were 1.140, 1.364, 1.437 and 3.682 mg/ml, respectively, while the scavenging effect on superoxide anion radical were 27.44, 22.80, 26.15, 1.99 mg AE/g, respectively. Among the four species, C. dabieshanensis possessed the highest antioxidant activity, while C. illinoensis was the lowest. The total phenolic (TP) contents and condensed tannins (CT) were determined in all samples spectrophotometrically. For all species, C. dabieshanensis possessed the highest TP content (80.54 mg GE/g defatted kernel) and C. hunanensis possessed the highest CT content (59.62 mg CE/g defatted kernel). In addition, strong correlations of total phenolic contents and condensed tannins contents with reducing powers, DPPH radical and superoxide anion scavenging activities were also found in this work.
Highlights
Tree nuts have long been considered as important components of the diet due to several bioactive and health-promoting components
The antioxidant activities of methanol extracts from four species of Carya genus were compared by various antioxidant assays, including the reducing power, 1,1-diphenyl-2-pycrylhydrazyl (DPPH) radical scavenging activity and the superoxide anion scavenging activity
Strong correlations of total phenolic contents and condensed tannins contents with reducing powers, DPPH radical and superoxide anion scavenging activities were found in this work
Summary
Tree nuts have long been considered as important components of the diet due to several bioactive and health-promoting components. Epidemiological evidence indicates that, the consumption of tree nuts may lower the risk of cardiovascular disease. The European prospective investigation into cancer and nutrition (EPIC) cohort study, conducted in ten European countries showed that, women consuming more than 6.2 g per day of nuts and seeds reduced their risk of colon cancer. Pecan, belonging to the Carya genus, has been reported to possess the highest antioxidant capacity and the highest phenolic content among the common fruits and vegetables across the US (Wu et al, 2004). Villarreal-Lozoya et al (2007) found that, kernels from different pecan cultivars had high antioxidant capacity and total phenolic content Pecan, belonging to the Carya genus, has been reported to possess the highest antioxidant capacity and the highest phenolic content among the common fruits and vegetables across the US (Wu et al, 2004). Villarreal-Lozoya et al (2007) found that, kernels from different pecan cultivars had high antioxidant capacity and total phenolic content
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