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US 6,784,309 B2Granted
Method for the purification of N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester
AssigneeThe NutraSweet Company
InventorsIndra Prakash, Kurt Wachholder
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Abstract
This invention relates to the purification of N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester by slurrying a mixture containing N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester with organic or aqueous organic solvents.
Claims7
A process for purifying N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester comprising the steps of:
- (a) washing N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester with water;
- (b) recovering by filtration the water washed N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester in solid form;
- (c) combining the recovered N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester with an organic solvent to form a slurry;
- (d) recovering by filtration N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester from the slurry in solid form;
- and
- (e) washing said recovered N-[N-(3,3-dimethylbutyl)-L-α-aspartyl]-L-phenylalanine 1-methyl ester with water and organic solvent.
3 more elements
Dependencies are inferred from the claim text.