Enhanced hydrothermal extraction of bamboo shoot polysaccharides by plasma-activated water: A process and characterization study
Yue Yu, Fuqiang Zhang, Binbin Tao, Caie Wu, Tingting Li, Xiaojing Li, Dandan Zhou, Gongjian Fan
Abstract
This study presents a novel, efficient approach for bamboo shoot polysaccharide hydrothermal extraction by plasma-activated water. The highest yield (122.14 ± 1.34 mg/g) of polysaccharides was obtained at jet power of 600 W, jet time of 94 s, extraction temperature of 81 °C, extraction time of 93 min. The polysaccharides mainly consisted of glucose, galactose, arabinose. Plasma-activated water and hydrothermal extracted polysaccharides (PAWP) have significantly lower molecular weight than conventional hot water extracted (CHWP). Furthermore, FT-IR spectroscope analysis and Congo red test showed both of them have pyranose rings, but the former also had α-Glycosidic bonds and β-Triple helix conformation. In addition, PAWP showed better water-holding, emulsifying abilities, rheological behaviors, DPPH and ABTS radical scavenging activities (DPPH IC 50 = 7.73 mg/mL, ABTS IC 50 = 1.01 mg/mL) than CHWP. This study provides a theoretical foundation for further research on the utilization of bamboo shoot polysaccharides. • PAW extraction is an efficient method for bamboo shoot polysaccharides extraction. • PAWP have better water-holding capacity and rheological behaviors than CHWP. • PAWP have better emulsifying capacity and antioxidant activities than CHWP.