Abstract
To determine the effect of different harvesting time on antioxidant capacity in Jerusalem artichoke polysaccharides (inulin), the Jerusalem artichoke before and after overwintering were collected from the same region, and then evaluate their antioxidant capacity in vitro by reducing power assay, DPPH radical-scavenging assay and hydroxyl radical-scavenging assay. Ascorbic acid at similar mass concentration was served as positive control. The results showed no significant difference were observed in reducing power when the absorbance values were about 0.3. When the mass concentrations before and after overwintering were 0.9 mg/mL and 1.7 mg/mL, the DPPH radical-scavenging rate both reached at 50%. And when the mass concentrations were both 10 mg/mL, the hydroxyl radical-scavengings were 35.8% and 27.9%, respectively. Thus, it could be concluded that the antioxidant capacity in Jerusalem artichoke polysaccharides before overwintering was higher than that after overwintering, and showed a good dose-dependent manner with its mass concentration.
Highlights
Jerusalem artichoke (Helianthus tuberosus L.), called Jiang Guizi, Yang Jiang, is a species of the Asteraceae family, genus Helianthus, originally grown in North America and later in China where it is introduced by Europe, and it has several advantages such as high growth rate, good tolerance to frost and drought and poor soil
The main reason was that starch in Jerusalem artichoke for a long winter was converted into soluble sugars, which increaseing the content of inulin [9]
The DPPH-scavenging rate increased with increasing of constant concentration (Fig. 3), which may attribute that inulin is a high polymer with multiple fructose groups linked by the same glycosidic bond and directly giving electrons [10]
Summary
Jerusalem artichoke (Helianthus tuberosus L.), called Jiang Guizi, Yang Jiang, is a species of the Asteraceae family, genus Helianthus, originally grown in North America and later in China where it is introduced by Europe, and it has several advantages such as high growth rate, good tolerance to frost and drought and poor soil. The Jerusalem artichoke polysaccharide is named inulin, as a natural carbohydrates which is soluble fiber and contains a short chain of fructose molecules as β- 2, 1 fructan, is abundant in the tubers, and has been used for bioethanol production. Modern pharmacological researches reported that Jerusalem artichoke has an effect on reducing blood glucose, serum cholesterol and triglycerides, improving insulin secretion, increasing absorption of calcium and magnesium and the number of bifidobacteria and lactobacilli in the colon [1]. Inulin had reported to have antioxidant capacity [3,4] and Jerusalem artichoke was mostly collected in the south and northwest parts of China. We first collected Jerusalem artichoke before and after overwintering, and investigated the link of the antioxidant capacity and different time
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