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Hydrate crystals

a monatin monosodium salt and hydrate crystal technology, applied in the field of new (2r, 4r) monatin monosodium salt hydrate crystals, can solve the problems of difficult handling of salt and lack of thermal stability

Inactive Publication Date: 2011-09-08
AJINOMOTO CO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0029]The new (2R,4R) monatin monosodium hydrate crystals characterized by having specific characteristic X-ray diffraction peaks make it possible to provide stable monatin sodium salt crystals. They also make it possible to clarify the utility and various physical properties of these stereoisomers as sweeteners. And they make it possible to provide orally consumed products such as foods, beverages, pharmaceutical products, topical pharmaceutical products, and feeds containing general-purpose, stable, and safe monatin sodium salt crystals. This invention can also be applied to (2S,4S) monatin, of course.

Problems solved by technology

The crystals of the characteristic existing (2R,4R) monatin sodium salt are fine, the salt is difficult to handle, and its thermal stability is somewhat lacking (see, WO 2003-045914).

Method used

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Examples

Experimental program
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Effect test

manufacturing example 1

Preparation of (2R,4R) Monatin Monopotassium Salt Monohydrate

[0100]In accordance with Example 17 of WO 2003-045914, 10 g of (2R,4R) monatin monoammonium salt crystals were dissolved in water and the solution was processed with cation-exchange resin DIAION PK228 (potassium type, made by Mitsubishi Chemical Corp.). The exiting solution was concentrated, ethanol was added dropwise at 35° C., the crystals were separated, and the mixture was dried under reduced pressure, yielding (2R,4R) monatin monopotassium salt monohydrate crystals (9.3 g).

[0101]Melting point: 220.0 to 222.3° C.

example 1

Preparation of (2R,4R) Monatin Monosodium Salt Hydrate Crystals (A)

[0102]A 4 g (11.5 mmol) quantity of the (2R,4R) monatin monopotassium salt monohydrate crystals of Manufacturing Example 1 was dissolved in 40 mL of water, the solution was passed through a column packed with 20 mL of cation-exchange resin DIAION UBK550 (sodium type, made by Mitsubishi Chemical Corp.) for replacement with sodium, and the exiting solution was condensed to 6.4 g. The condensed solution obtained was left standing for 6 hours at 5° C. The crystals were separated from the crystallization solution and washed with 2 mL of cold water. The wet crystals were then dried overnight in a reduced pressure drier at 40° C., yielding 2.28 g (6.4 mmols) of (2R,4R) monatin monosodium salt hydrate crystals (A).

[0103]1HNMR (D2O) δ: 1.94-2.01 (q 1H), 2.57-2.61 (q 1H), 2.99-3.03 (d 1H), 3.19-3.23 (d 1H), 3.54-3.57 (q 1H), 7.05-7.17 (m 3H), 7.40-7.42 (m 1H), 7.64-7.66 (m 1H).

[0104]ESI-MS: 293.1 (M+H)+, 291.1 (M−H)−

Moisture c...

example 2

Hydrate Crystallization and Redrying Test

[0105]The (2R,4R) monatin monosodium salt hydrate crystals (A) (corresponding to 2.5 hydrate) obtained in Example 1 were dried for another 24 hours under reduced pressure at 40° C. and cooled overnight to room temperature in a desiccator in the presence of silica gel to obtain the following (2R,4R) monatin monosodium salt hydrate crystals (A):

[0106]Moisture content (immediately after drying): 6.9 wt % (corresponding to 1.3 hydrate)

[0107]Moisture content (immediately following powder X-ray measurement of crystals stored in desiccator): 8.0 wt % (corresponding to 1.5 hydrate)

[0108]Characteristic X-ray diffraction peaks (2θ+0.2°, CuKα): 7.8°, 10.9°, 16.7°, and 17.1° (see, FIG. 4)

[0109]This test revealed that a change in the hydrate from 2.5 to 1.5 had almost no effect on the characteristic X-ray diffraction peaks.

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Abstract

New (2R,4R) monatin monosodium salt hydrate crystals characterized by having specific characteristic X-ray diffraction peaks provide general-purpose, stable, and safe monatin sodium salt crystals incorporating no organic solvent. These crystal may be prepared by a method that requires no organic solvent in the crystallization, separation, and drying steps. These crystal are useful as sweeteners and for the preparation of orally consumed products, such as foods, beverages, pharmaceutical products, topical pharmaceutical products, and feeds containing general-purpose, stable, and safe monatin sodium salt crystals.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Patent Application No. 61 / 036,349, filed on Mar. 13, 2008; U.S. Provisional Application No. 61 / 119,396, filed on Dec. 3, 2008; Japanese Patent Application No. 060859 / 2008, filed on Mar. 11, 2008; and Japanese Patent Application No. 307637 / 2008, filed on Dec. 2, 2008, all of which are incorporated herein by reference in their entireties.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to new (2R,4R) monatin monosodium salt hydrate crystals, characterized by having specific, characteristic X-ray diffraction peaks. It also relates to monatin crystals comprising these crystals, and to orally consumed products comprising these crystals.[0004]2. Discussion of the Background[0005]Monatin is a naturally occurring amino acid derivative isolated from the bark of the roots of Schlerochiton ilicifolius, which is a plant naturally grown in the area of no...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K31/405C07D209/20A23L1/236A23L27/00A23L27/20A23L27/30A61K47/22
CPCC07D209/20A61P3/00A61P3/10
Inventor MORI, KENICHIONO, ERIKO
Owner AJINOMOTO CO INC
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