5856-20-2

Upstream product

• 74-88-4 methyl iodide 
• 81562-07-4 p-nitrophenyl 4,6-O-benzylidene-3-O-D-galactopyranosyl-β-D-galactopyranoside 

Relevant academic research and scientific papers

A novel low-molecular-mass pumpkin polysaccharide: Structural characterization, antioxidant activity, and hypoglycemic potential

The novel natural low-molecular-mass polysaccharide (SLWPP-3) from pumpkin (Cucurbia moschata) was separated from the waste supernatant after macromolecular polysaccharide production and purified using a DEAE cellulose-52 column and gel-filtration chromatography. Chemical and instrumental studies revealed that SLWPP-3 with a molecular mass of 3.5 kDa was composed of rhamnose, glucose, arabinose, galactose and uronic acid with a weight ratio of 1: 1: 4: 6: 15, and primarily contained →3,6)-β-D-Galp-(1→, →4)-α-GalpA-(1→(OMe), →4)-α-GalpA-(1→, →2,4)-α-D-Rhap-(1→, →3)-β-D-Galp-(1→, →4)-α-D-Glcp, and →4)-β-D-Galp residues in the backbone. The branch chain passes were connected to the main chain through the O-4 atom of glucose and O-3 atom of arabinose. Physiologically, the ability of SLWPP-3 to inhibit carbohydrate-digesting enzymes and DPPH and ABTS radicals, as well as protect pancreatic β cells from oxidative damage by decreasing MDA levels and increasing SOD activities, was confirmed. The findings elucidated the structural types of pumpkin polysaccharides and revealed a potential adjuvant natural product with hypoglycemic effects.

New constituent from Argemone mexicana Linn.

The present paper reports the isolation and structure elucidation of a new compound A identified as 5,7,4′-trihydroxy-8-methoxy flavanone-4′- α-L-rhamno-pyranosyl-7-O-β-D-xylopyranosyl-(1→3) -O-β-D-galactopyranoside along with two known compounds B and C identified as chrysoeriol and tricin, respectively from the methanolic extract of the defatted seeds of the plant by various colour reactions, chemical degradation and spectral analysis.

Chemical properties and antiulcerogenic activity of a galactomannoglucan from Syagrus oleracea

A galactomannoglucan (GMG) with an estimated weight-average molar mass of 415,000. g/mol was obtained from an aqueous extract of the mesocarp of fruits of Syagrus oleracea (Mart.) Becc. by fractionation by Sephacryl S-300 HR and Sephadex G-25. Chemical and spectroscopic studies indicated that GMG has a chain of (1 → 4)-linked β-d-mannopyranosyl residues attached to an initial chain of (1 → 3)-linked β-d-galactopyranosyl residues and a terminal chain of (1 → 4)-linked α-d-glucopyranosyl residues which comprised galactose, mannose and glucose in the molar ratio of 30:33:37. Results of the present study indicated that the polysaccharide GMG of S. oleracea significantly inhibited gastric lesions induced by ethanol, showing a gastroprotective property.

SYNTHESIS OF p-NITROPHENYL 3-O-β-D-GALACTOPYRANOSYL-β-D-GALACTOPYRANOSIDE AND p-NITROPHENYL 3-O-α-D-GALACTOPYRANOSYL-β-D-GALACTOPYRANOSIDE

Glycosylation (catalyzed by mercuric cyanide) of p-nitrophenyl 2,4,6,-tri-O-acetyl-β-D-galactopyranoside (2) with 2,3,4,6-tetra-O-acetyl-α-D-galactopyranosyl bromide in acetonitrile afforded the α-(1->3)- and β-(1->3)-linked disaccharide heptaacetates (4