The yellow (YP) and white (WP) sections of giant swamp taro (GST) contain 40.0 g/kg and 51.5 g/kg (dry wt) respectively of pure mucilage made up of D-glucose (44.95–78.85 %), D-galactose (8.70–25.35 %), D-mannose (3.20–10.45 %), D-arabinose (2.45–5.20 %) and small amounts of glucuronic acid and rhamnose. Arabinogalactan-proteins (5.30–8.83 g/kg) contain mainly arabinose and galactose (in a 1:1 proportion) and also significant amounts of rhamnose, xylose, glucuronic acid and mannose. Antioxidant activity of YP was higher than those of WP while chelating ability and reducing power increased with mucilages content. Generally YP and WP showed better reducing power (1.06 ± 0.35 at 5 mg/mL) than ascorbic acid (0.89 ± 0.22). WP and YP chelated ferrous ions by 20.0–76.0 % and 16.4–71.0 % respectively. Effective concentrations (EC50) of mucilages (WP 1.28 ± 0.05 mg/mL; YP 1.42 ± 0.04 mg/mL) were lower than those of citric acid (1.58 ± 0.04 mg/mL). Generally mucilage from the WP and YP sections are excellent sources of chelating agents.
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机译：巨型芋头（GST）的黄色（YP）和白色（WP）部分分别包含40.0 g / kg和51.5 g / kg（干重）的纯粘液，由D-葡萄糖（44.95–78.85％），D组成-半乳糖（8.70–25.35％），D-甘露糖（3.20–10.45％），D-阿拉伯糖（2.45-5.20％）和少量的葡萄糖醛酸和鼠李糖。阿拉伯半乳聚糖蛋白（5.30–8.83 g / kg）主要包含阿拉伯糖和半乳糖（比例为1：1），还包含大量的鼠李糖，木糖，葡萄糖醛酸和甘露糖。 YP的抗氧化活性高于WP，而螯合能力和还原能力随黏液含量的增加而增加。通常，YP和WP的还原能力（5 mg / mL时为1.06±±0.35）比抗坏血酸（0.89±0.22）更好。 WP和YP螯合的亚铁离子分别为20.0–76.0％和16.4–71.0％。黏液的有效浓度（EC50）（WP 1.28±0.05 mg / mL; YP 1.42±0.04 mg / mL）低于柠檬酸（1.58±0.04 mg / mL）。通常，来自WP和YP部分的粘液是螯合剂的极好来源。
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