Abstract
We adopted and developed an ultrasonic-assisted extraction method to obtain polysaccharides from tree peony pods using polyethylene glycol (PEG) as the solvent. The technological parameters have been designed as a single factor to enhance the tree peony pod polysaccharide extraction yield. Specific conditions (ultrasound irradiation power, 250 W; ultrasound irradiation time, 30 min; reaction temperature 50°C; liquid-solid ratio, 25 mL/g; and concentration of PEG, 0.2 g/mL) generated an experimental yield of 14.14% ± 0.44%. Subsequently, the monosaccharide composition of the tree peony pod polysaccharides was determined by HPLC using a 1-phenyl-3-methyl-5-pyrazolone precolumn derivatization method. The results indicated that tree peony pod polysaccharides contained mannoses, rhamnose, glucuronic acid, galacturonic acid, glucose, galactose, arabinose, and fucose with a molar ratio of 1.44 : 2.87 : 0.32 : 18.99 : 3.99 : 10.21 : 0.96 : 1.85 : 0.21. The tree peony pod polysaccharides obtained are mainly galacturonic acid and galactose, which are acidic polysaccharides. Finally, the antioxidant activities (DPPH and FRAP) of the tree peony pod polysaccharides were assessed, and the compounds exhibited moderate antioxidant activities.
Highlights
Plant polysaccharides are a class of macromolecular compounds that contain more than ten monosaccharides and are polymerized by glycosidic bonds
Tree peony pod was used as a raw material with PEG400 solution as an extraction solvent for the ultrasoundassisted extraction of polysaccharides
The tree peony pod polysaccharides are composed of mannoses, rhamnose, glucuronic acid, galacturonic acid, glucose, galactose, arabinose, and fucose with a molar ratio of 1.44 : 2.87 : 0.32 : 18.99 : 3.99 : 10.21 : 0.96 : 1.85 : 0.21
Summary
Plant polysaccharides are a class of macromolecular compounds that contain more than ten monosaccharides and are polymerized by glycosidic bonds. Studies have shown the pharmacological effects of polysaccharides, such as antitumor [1, 2], anti-inflammatory [3], antioxidation [4, 5], antiaging [5], and cardiovascular disease inhibition [6]. Research on the separation, purification, chemical structure, and pharmacological activities of polysaccharides has gone viral. Tree peony is a ligneous plant that belongs to the family Ranunculaceae [7]. It is an endemic species in China and exists mainly in central and southwestern China. Peony has more than 2,000 years of cultivation history in China, mainly for ornamental and medicinal use [7]. Peony root skin as a traditional Chinese medicine is included in the Pharmacopoeia of the People’s Republic of China (TCM) [7]
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