Efficient Fractionation of Green Bamboo Using an Integrated Hydrothermal–Deep Eutectic Solvent Pretreatment for Its Valorization

Adopting an integrated strategy to realize efficient fractionation of lignocellulose into well-defined components for its valorization is challenging. Combinatorial pretreatments in this study decomposed hemicellulose of green bamboo during hydrothermal pretreatment (HP), and the hydrothermally pretreated bamboo was subsequently subjected to delignification using deep eutectic solvent (DES) consisting of choline chloride and lactic acid, finally facilitating enzymatic hydrolysis of cellulose residue. Upon hydrothermal treatment at 180 °C for 35 min, hemicellulose removal of 88.6% was achieved with xylo-oligosaccharide yield and purity of 50.9% and 81.6%, respectively. After DES treatment at 140 °C for 2 h, lignin removal was determined to be 79.1%. Notably, the regenerated lignin with high purity of 96.8% displayed superior antioxidant activity, and the decrease in the ratio of syringyl units to guaiacyl units led to a slight decrease in radical scavenging activity of lignin after five recycling runs of DES. Moreover, the two-step treated residue had much higher enzymatic digestibility than that of single HP residue and untreated green bamboo. Results show that synergistic pretreatment is a promising strategy to tackle the recalcitrance of lignocellulose towards high value-added utilization

The impacts of some sedative drugs on α -glycosidase, acetylcholinesterase and butyrylcholinesterase enzymes-potential drugs for some metabolic diseases

Background: The present paper focuses on the in vitro inhibition of some sedative drugs such as Midazolam, Propofol, Hipnodex, Ketamine, and Pental sodium on acetylcholinesterase (AChE), Butyrylcholinesterase (BChE), and α-glycosidase (α-Gly) enzymes. Methods: These drugs were tested in diverse concentrations, which showed positive effects in vitro AChE, BChE, and α-Gly activities. Ki values were 20.14, 94.93, 636.78, 416.42, and 953.75 μM for AChE, 17.52, 32.03, 88.02, 93.48, and 91.84 μM for BChE, and 10.87, 156.68, 48.21, 37.88, 151.01 μM for α-glycosidase, respectively. Results: An enhancing number of experiential observations show potentially harmful effects of sedative drugs on the extension of brain Conclusion: Midazolam exhibited effective inhibitory activity compared with the other drugs for these enzymes. © 2019 Bentham Science Publishers