Characterization of physicochemical properties and antioxidant activity of polysaccharides from shoot residues of bamboo (Chimonobambusa quadrangularis): Effect of drying procedures. (15th September 2019) - Chen, Guangjing
Highlights: Four drying methods were comparatively studied on the properties of CPS from BSR. Freeze-drying (FD) method had lower molecular weight for BSR polysaccharides. BSR polysaccharides dried with FD method exhibited better antioxidant ability. The relationship between characteristics and activities of CPS was investigated. FD method was a good choice for industrial production of high quality of CPS. Abstract: In the present study, the bamboo shoot ( Chimonobambusa quadrangularis ) residue (BSR)-derived polysaccharides (CPS) were dried using different drying procedures, including hot air-, vacuum-, freeze-, and spray-drying. The influences of different drying procedures on the chemical compositions, physicochemical characteristics, and antioxidant activity of CPS were investigated. The results indicate that freeze-dried CPS possessed the highest polysaccharide yield (8.86%) and uronic acid content (9.42%), and the lowest medium-high molecular weight (117.49 kDa) and glucose content (5.81 mol%). Also, freeze-dried CPS had better water (5.17 g/g) and oil retention capacities (2.32 g/g) than hot air- and vacuum-dried CPS. Moreover, freeze-dried CPS exhibited the most potent antioxidant ability. Based on correlation analysis, a higher uronic acid content, lower molecular weight and lower glucose content might be closely associated with the better antioxidant activity of the freeze-dried CPS. Hence, the above results revealed freeze-drying was the optimal method for industrial production of high quality CPS.