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Nucleotide Sugar Purification Using Membranes

a technology of nucleotide sugar and membrane, which is applied in the direction of sugar derivates, organic chemistry, chemistry apparatus and processes, etc., can solve the problems of unfavorable presence of contaminants, high cost of chromatographic purification methods, and inability to use them for commercial production of saccharides, etc., to achieve a higher carbohydrate ratio and carbohydrate ratio

Inactive Publication Date: 2009-02-19
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention also provides methods for removing one or more contaminants from a solution that contains a carbohydrate of interest. The methods involve contacting the solution with a first side of a semipermeable membrane having rejection coefficients so as to retain the carbohydrate while allowing the contaminant to pass through the membrane. The membrane is selected from the group consisting of an ultrafiltration membrane, a nanofiltration membrane, and a reverse osmosis membrane, depending on the size and charge of the carbohydrate of interest relative to those of the contaminants. The membrane separates a feed solution containing a carbohydrate into a retentate portion and a permeate portion. If the rejection coefficient of

Problems solved by technology

The presence of these contaminants is undesirable for many applications for which the carbohydrate compounds are useful.
For example, chromatographic purification methods are not amenable to large-scale purifications, thus precluding their use for commercial production of saccharides.
Moreover, chromatographic purification methods are expensive.

Method used

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Examples

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example 1

Fmoc-Glycyl-Mannosamine Synthesis and Purification

[0146]The synthesis of Fmoc-glycyl-mannosamine (FGM) occurred in a non-aqueous solution involving two main compounds: D-Mannosamine HCl and Fmoc-Glycyl-OSu. Both materials were dry powders that were introduced into a system comprised of anhydrous methanol and sodium methoxide. The reaction was agitated at 25° C. for 1 hThe reaction was complete when the FGM concentration was greater than 15 mg / mL, determined by HPLC. The FGM synthesis was then rotovapped (20° C.) to about 8% of the initial volume. The chromatographic purification was performed using a Biotage pre-packed silica column. The FGM solution was loaded onto the column in a 50:50 CHCl3:CH3OH solution. The silica column was then washed with 18 column volumes (CV) of 3% CHCl3 / 97% CH3OH. Following the wash, FGM was eluted from the column using 14 CV of 15% CHCl3 / 85% CH3OH. Fractions containing material were pooled and then rotovapped (20° C.) to dryness and stored at 4° C. The ...

example 2

I. Description of CMP-Glycyl-Sialic Acid and CMP-Sialic Acid-PEG Synthesis and Purification

[0149]The production of CMP-Sialic Acid-PEG (PSC) was performed in two segments. First, a key intermediate, CMP-Glycyl-Sialic Acid (GSC), was synthesized, purified, and dried, and second, this intermediate was PEGylated, purified, and dried. A synthetic pathway for CMP-SA-PEG is shown below.

Synthetic Pathway for CMP-SA-PEG

[0150]The first step in the synthesis of GSC was the reaction of mannosamine with Fmoc-Gly-OSu in methanol under basic conditions. The resulting Fmoc-glycyl-mannosamine was purified on a silica flash chromatography column. The purified Fmoc-glycyl-mannosamine then entered a two step enzymatic reaction. Fmoc-glycyl-mannosamine (FGM) was reacted with pyruvate to convert to Fmoc-glycyl-sialic acid. This reaction was catalyzed by a commercially available sialic acid aldolase. Fmoc-glycyl-sialic acid was then coupled to cytidine-5′-monophosphate through a CMP-NAN synthetase cataly...

example 3

I. Summary of Consistency Batches of 10k and 20k Cmp-SA-PEG After Process Development

[0164]Consistency batches were performed for 10K and 20K CMP-Sialic Acid-PEG after development of the synthesis and purification operations. These batches demonstrated that a reproducible process had been developed to produce high-purity CMP-SA-PEG with very low contaminant levels, suitable for the glycopegylation projects.

[0165]10K CMP-SA-PEG was produced at greater than 80% purity at overall process yields of approximately 60%, and 20K CMP-SA-PEG was produced at greater than 70% purity at overall process yields of approximately 50%. The products were low in endotoxin, bioburden, and protein, and NMR has shown that the balance of the material was nearly all mPEG-OH, a by-product of the synthesis process.

Materials and Methods

[0166]CMP-SA-PEG (PSC) was produced in a reaction of CMP-Glycyl-Sialic Acid (GSC) with paranitrophenyl-carbomate-polyethylene glycol (pNP-PEG). The reaction conditions for the c...

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Abstract

The invention provides methods of removing contaminants from a mixture of a desired product and contaminants by pH adjustments and molecular weight cut-offs. The contaminants include phosphate groups, magnesium sulfate, sodium pyruvate and tetrasodium pyrophosphate groups. The desired product includes nucleotide sugars, glycolipids, LnNT, sialyl lactose, and salts.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a U.S. national phase application of PCT / US2006 / 043048 filed Nov. 3, 2006, which claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application No. 60 / 829,242, filed Oct. 12, 2006, U.S. Provisional Application No. 60 / 823,538, filed Aug. 25, 2006, U.S. Provisional Application No. 60 / 746,754, filed May 8, 2006, U.S. Provisional Application No. 60 / 796,281, filed Apr. 28, 2006, and U.S. Provisional Application No. 60 / 733,975, filed Nov. 3, 2005, the disclosures of which are incorporated herein by reference for all purposes.BACKGROUND OF THE INVENTION[0002]Increased understanding of the role of carbohydrates as recognition elements on the surface of cells has led to increased interest in the production of carbohydrate molecules of defined structure. For instance, compounds comprising the oligosaccharide moiety, sialyl lactose, have been of interest as neutralizers for enterotoxins from bacteria such a...

Claims

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Application Information

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IPC IPC(8): C07H1/06
CPCC12P19/305C07H19/06Y02P20/582
Inventor FELO, MICHAELDEFREES, SHAWN
Owner NOVO NORDISK AS
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