Pharmaceutical composition containing sialic acid derivatives
First Claim
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1. A pharmaceutical composition characterized by containing as an active ingredient a sialic acid derivative represented by the general formula (1) or (2) below:
- ##STR15## wherein R1 represents a glycopeptide residue; and
X1 and X2, which may be identical or different, represent NeuAc(α
2,6)Gal(β
1,4)GlcNAc(β
1,2)-, Gal(β
1,4)GlcNAc(β
1,2)-, or GlcNAc(β
1,2)-, provided that at least one of X1 and X2 represents NeuAc(α
2,6)Gal(β
1,4)Glc NAc(β
1,2)-;
##STR16## wherein R2 and R3, which may be identical or different, represent a hydrogen atom or a linear, branched or cyclic, saturated or unsaturated acyl group having 1 to 30 carbon atoms;
n is an integer of 1 to 20; and
X3 represents a sialic acid derivative residue or a sialyloligosaccharide derivative residue represented by the general formula (3) below;
##STR17## wherein X4 and X5, which may be identical or different, represent NeuAc(α
2,6)Gal(β
1,4)GlcNAc(β
1,2)-, Gal(β
1,4)GlcNAc(β
1,2)- or GlcNAc(β
1,2)-, provided that at least one of X4 and X5 represents NeuAc(α
2,6)Gal(β
1,4)Glc NAc(β
1,2)-; and
Y represents a sugar residue.
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Abstract
The present invention is a pharmaceutical composition used as an antiviral agent, a diarrheal remedy, an antiulcer agent, an anti-inflammatory agent, an anti-allergic agent and an agent for promoting the proliferation of Bifidobacteria, characterized by containing a sialic acid derivative as an active ingredient. The method for producing a sialic acid derivative of the present invention is characterized in that an almond or apricot seed is added to an avian egg yolk, by which the desired product can easily be obtained in a high yield.
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Citations
27 Claims
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1. A pharmaceutical composition characterized by containing as an active ingredient a sialic acid derivative represented by the general formula (1) or (2) below:
- ##STR15## wherein R1 represents a glycopeptide residue; and
X1 and X2, which may be identical or different, represent NeuAc(α
2,6)Gal(β
1,4)GlcNAc(β
1,2)-, Gal(β
1,4)GlcNAc(β
1,2)-, or GlcNAc(β
1,2)-, provided that at least one of X1 and X2 represents NeuAc(α
2,6)Gal(β
1,4)Glc NAc(β
1,2)-;
##STR16## wherein R2 and R3, which may be identical or different, represent a hydrogen atom or a linear, branched or cyclic, saturated or unsaturated acyl group having 1 to 30 carbon atoms;
n is an integer of 1 to 20; and
X3 represents a sialic acid derivative residue or a sialyloligosaccharide derivative residue represented by the general formula (3) below;
##STR17## wherein X4 and X5, which may be identical or different, represent NeuAc(α
2,6)Gal(β
1,4)GlcNAc(β
1,2)-, Gal(β
1,4)GlcNAc(β
1,2)- or GlcNAc(β
1,2)-, provided that at least one of X4 and X5 represents NeuAc(α
2,6)Gal(β
1,4)Glc NAc(β
1,2)-; and
Y represents a sugar residue. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- ##STR15## wherein R1 represents a glycopeptide residue; and
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2. A method for producing a sialic acid derivative represented by the following general formula (4) ##STR18## wherein R4 represents a sugar residue;
- X1 and X2, which may be identical or different, represent NeuAc(α
2,6)Gal(β
1,4)GlcNAc(β
1,2)-, Gal(β
1,4)GlcNAc(β
1,2)- or GlcNAc(β
1,2)-, provided that at least one of X1 and X2 represents NeuAc(α
2,6)Gal(β
1,4)GlcNAc(β
1,2)- comprising the steps of;(a) adding water or brine selected from a potassium salt, a sodium salt and a salt capable of buffering over the range of pH 5 to 10 to avian egg yolk, (b) stirring and filtering the mixture obtained in step (a), (c) adding almond or apricot seed to the filtrate obtained in step (b), (d) stirring the mixture obtained in step (c), (e) subjecting the mixture obtained in step (d) to an anion exchange resin and carrying out elution, and (f) desalting the eluate obtained in step (e). - View Dependent Claims (3, 4, 5, 6, 7, 8)
- X1 and X2, which may be identical or different, represent NeuAc(α
Specification