Structural characterization and immunomodulatory activities of polysaccharides from Russula vinosa lindblad extracted using KOH

Russula vinosa Lindblad (R. vinosa Lindblad) is a nutrient-rich wild edible fungus, abundant in carbohydrates. In this study, two polysaccharides (Russula polysaccharides extracted from 1% KOH (RP-1) and Russula polysaccharides extracted from 5% KOH (RP-5)) were extracted from Russula fruit bodies using KOH-graded extraction technology. The molecular weights of RP-1 and RP-5 were 187 000 and 97 300 u, respectively. Their glycosyl compositions (galactose꞉glucose꞉xylose꞉ mannose, i.e., Gal꞉Glu꞉...

The state-of-the-art preparation, purification and biological activities of mannan oligosaccharides

Mannan oligosaccharides (MOSs), a class of functionally edible oligosaccharides, show a range of advantages given its abundant, sustainable, bioactive, and biocompatible properties. They have been widely applied into the fields of pharmaceutical, food and feed industries. To fully understand the progress of the preparation and biological activities of MOSs in these fields in decades, we summarized and compared various techniques for the preparation of MOSs from yeast cell walls and different ...

The role of N-containing carbohydrates in organic catalysis: a review

Weak-coordination-auxiliary aminocatalysis enables directed [3 + 2] cyclization for 2-acylindolizines

The synthesis of 2-acylindolizines, possessing a readily modifiable ketone group, is of significant importance as it provides versatile precursors for the preparation of various indolizines. However, due to the electronically less active and more sterically demanding nature of α,β-unsaturated ketones toward iminium formation with an aminocatalyst, the efficient one-pot transformation of α,β-unsaturated ketones for distinct 2-acylindolizines bearing sensitive groups represents a challenge for ...