Optimised extraction of Erythronium sibiricum bulb polysaccharides and evaluation of their bioactivities

In this study, the extraction of Erythronium sibiricum bulb polysaccharides (ESBP) through hot water decoction was optimised using response surface methodology (RSM) and a three-level, four-factor Box–Behnken design. The optimum extraction conditions were as follows: extraction time of 4.28h, extraction temperature of 90°C, ratio of liquid to raw material of 37mL/g and extraction cycle number of three. The experimental yield (37.25%±0.17%) agreed with the predicted value of the RSM model (37.465%). Preliminary ESBP characterisation was conducted through physicochemical analysis. Biological activity test results showed that ESBP exhibited antioxidant activities and excellent anti-inflammatory and analgesic activities, indicating its potential as an anti-inflammatory and analgesic agent.