Extraction of Polygonatum odoratum polysaccharides using response surface methodology and preparation of a compound beverage

► An ultrasonic procedure for the extraction of Polygonatum odoratum (Mill.) Druc (P. odoratum) polysaccharides was established. ► Response surface methodology (RSM) was applied to optimize the ultrasound-assisted extraction parameters. ► The yield of P. odoratum polysaccharides can increase from 11.40% to 15.15%. ► The physicochemical properties of P. odoratum polysaccharides were characterised. ► An orthogonal experiment was developed for the preparation of a compound beverage of P. odoratum polysaccharides.