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Abstract
Purpose: To describe a chemoenzymatic approach joining an enzymatic regioselective hydrolysis of peracetylated N-acetyl-α-D-glucosamine (A) with a mild controlled acyl relocation which resulted 2-acetamido-2 deoxy-1,3,6-tri-O-acetyl-α-D-glucopyranose (1B). Methods: Immobilization of lipase on decaoctyl (DSEOD) and octyl-agarose (OSCL) was carried out as reported by the work of Bastida et al. The newly developed RP-HPLC method for examining the enzymatic hydrolysis was carried out isocratically utilizing a HPLC system. Results: The new approach resulted the target compound (B) in 95% yield after purification utilizing flash column chromatography. Candida rugosa-lipase immobilized ondecaoctyl-sepabeads was the best catalyst in terms of activity and region-selectivity in the hydrolysis of substrate (A), delivering the deacetylation at C6 position (98% general yield). Also, a reversed-phase high-performance liquid-chromatographic (RP-HPLC) method for controlling the region-selective hydrolysis of peracetylated N-acetyl-α-D-glucosamine (A) with a mild monitored acyl movement which led to 2-acetamido-2-deoxy-1,3,6-tri-O-acetyl-α-D-glucopyranose (1B) has additionally been developed. The developed RP-HPLC method was utilized as fingerprints to follow the hydrolysis of substrate (A) and to determine its purity and additionally yield. Furthermore, the acquired compound (B) was further purified by flash chromatography. Compound (B) was further characterized utilizing 1HNMR and mass spectrometry. Conclusion: An efficient chemoenzymatic procedure to optimize the preparation of peracetylated lactosamine B containing acetyl ester as extraordinary protecting group is presented. Compound B is a significant intermediate for the synthesis of pharmacologically active compound (e.g. complex oligosaccharides for biochemical, biophysical, or biological examinations). Besides, reaction monitoring utilizing HPLC proposes more exact information than spectroscopic methods.
Highlights
Carbohydrates are viewed as a key part in various biological processes
The second is acetyl xylan esterase (ACEXE) obtained from Bacillus pumilus which immobilized on acrylic resin and epoxy groups as functional groups
The results of the previous reaction was in agreement with the results reported for the hydrolysis of A that catalyzed by Candida rugosa lipase (CRGL) and immobilized at pH 4.21,22 CRGL immobilized on DSEOD showed a higher regioselectivity as well as activity in 24 h (98%) in comparison with the hydrolysis which catalyzed by CRGL immobilized on octyl-sepharose CL-4B (OSCL) within 48h (27%) once the hydrolysis took place at pH 5
Summary
Carbohydrates are viewed as a key part in various biological processes. Given their differing difficulty in all cells, it is not surprising that glycans have various assorted part in different physiological processes. A generous number of bioactive compounds are glycosylated and the sugar moiety is considered as a key for their bioactivity.[1] Of them, glycoproteins found in cell–cell recognition of various pathologies are of remarkable interest.[2] oligosaccharides found in glycoproteins are recognized by lectin receptors, the key part for carbohydratemediated recognition actions.[3] For example, lacto oligosaccharides series are incorporated into a couple of structures with high biological concern (e.g., glycolipids and glycoproteins) (Figure1).[4,5,6]
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