Phenolic Profiles and Antioxidant Activity of Lotus Root Varieties

Abstract

Lotus root attracts increasing attention mainly because of its phenolic compounds known as natural antioxidants. Its thirteen varieties were systematically analyzed on the content, distribution, composition and antioxidant activity of phenolic compounds for a better understanding of this aquatic vegetable. The respective mean contents of total phenolics in their flesh, peel and nodes were 1.81, 4.30 and 7.35 mg gallic acid equivalents (GAE)/g fresh weight (FW), and those of total flavonoids were 3.35, 7.69 and 15.58 mg rutin equivalents/g FW. The phenolic composition determined by a high-performance liquid chromatography method varied significantly among varieties and parts. The phenolics of flesh were mainly composed of gallocatechin and catechin; those of peel and node were mainly composed of gallocatechin, gallic acid, catechin and epicatechin. The antioxidant activities of phenolic extracts in increasing order were flesh, peel and node; their mean concentrations for 50% inhibition of 2,2-diphenyl-1-picrylhydrazyl radical were 46.00, 26.43 and 21.72 µg GAE/mL, and their mean values representing ferric reducing antioxidant power were 75.91, 87.66 and 100.43 µg Trolox equivalents/100 µg GAE, respectively. "Zoumayang", "Baheou", "No. 5 elian" and "Guixi Fuou" were the hierarchically clustered varieties with relatively higher phenolic content and stronger antioxidant activity as compared with the others. Especially, their nodes and peels are promising sources of antioxidants for human nutrition.

<i>In vitro</i> antioxidant and antimicrobial activities of aerial parts of Algerian <i>Jurinea humilis</i> DC (Asteraceae)

“…These results are similar to those of previous studies on J. dolomiaea [4][5][6]. The present work was consistent with reported findings which confirmed that polyphenols and flavonoids are responsible for most of the antioxidant capacity of the extracts [17][18][19][20].…”

Antioxidant and Anti-Inflammatory Activities of Fractions from Bidens engleri O.E. Schulz (Asteraceae) and Boerhavia erecta L. (Nyctaginaceae)

“…As the metabolites were the main contributor to the antioxidant and anti-inflammatory powers, the phenolic and flavonoid contents were evaluated [ 16 , 23 ]. The yield of extraction is shown in Table 1 .…”

Effect of cooking methods on nutritional composition and antioxidant properties of lotus (Nelumbo nucifera) rhizome

“…It contains alkaloids that is used in treating arrhythmia, sunstroke, fever, diarrhoea, dysentery, dizziness and stomach problems (Shad et al, 2011). Furthermore, it also has pharmacological activities such as antidiarrhoeal, anti-inflammatory, antioxidant, antipyretic, diuretic, hypoglycaemic, immunomodulatory and psychopharmacological activities (Bhardwaj and Modi, 2016;Yi et al, 2016). The extract of lotus rhizome especially from its nodes contains a high amount of antioxidant such as phenolic, tannin and flavonoid (Moro, 2012).…”