摘要:
A crystallization process for forming a stable crystal of N-(3,3-dimethylbutyl)-APM, which comprises using either water or a mixture of water with a lower alcohol as the crystallizing solvent and controlling the crystallization point to 30° C. or above; and another crystallization process therefor, which comprises using either water or a mixture of water with a lower alcohol as the crystallizing solvent and using as the seed crystal a crystal of N-(3,3-dimethylbutyl)-APM exhibiting peculiar peaks of diffracted X-ray at least at diffraction angles (2θ, CuKα ray) of 6.0°, 24.8°, 8.2° and 16.5° to thereby crystallize the above objective crystal preferentially. These crystallization processes enable the constant formation of stable crystals of N-(3,3-dimethylbutyl)-APM at a low cost.
摘要:
Disclosed in the present application are a method for preparing highly-stable A-type crystals by controlling and maintaining the product temperature of B-type N-(3,3-dimethylbutyl)-APM crystals at 25 to 80° C. under an absolute humidity of 0.203 kg/kg or less environment, thereby effecting crystal transition; and a method for preparing A-type crystals by controlling and maintaining the product temperature of D-type crystals of N-(3,3-dimethylbutyl)-APM at 25 to 80° C. under an absolute humidity of 0.0550 kg/kg or less environment, thereby effecting crystal transition. According to these crystal transition methods, highly stable crystals can be prepared stably and at a low cost.
摘要:
For example, N-[N-(3,3-dimethylbutyl)-L-&agr;-aspartyl]-L-phenylalanine methyl ester (A-type crystal) showing characteristic peaks in diffractive X-ray at diffraction angles (2&thgr;, CuK&agr; ray) of at least 6.0°, 24.8°, 8.2° and 16.5° is dried to its water content below 3% by weight. The crystal thus dried is a novel crystal (C-type crystal) of N-[N-(3,3-dimethylbutyl)-L-&agr;-aspartyl]-L-phenylalanine methyl ester excellent in dissolution rate, and when measured by powder X-ray diffractometry, this crystal shows characteristic peaks in diffractive X-ray at diffraction angles (2&thgr;, CuK&agr; ray) of at least 7.1°, 19.8°, 17.3° and 17.7°. The dissolution rate (solubility) of the C-type crystals is further improved by converting the crystals into granules.
摘要:
One embodiment of the present invention provides a sweetener composition, which includes N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester, and Aspartame, wherein a ratio of the Aspartame to a total amount of the Aspartame and the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester is in the range of 10 to 99.5% by weight, methods of making and of using. Another embodiment of the present invention provides a method for preparing a sweetener composition, which includes drying an A-type crystal of N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl }-L-phenylalanine 1-methyl ester to obtain a C-type crystal of N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl }-L-phenylalanine 1-methyl ester. Another embodiment of the present invention provides a method for producing a sweetener, which includes admixing N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl }-L-phenylalanine 1-methyl ester with Aspartame, wherein a ratio of the Aspartame to a total amount of the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl }-L-phenylalanine 1-methyl ester and the Aspartame is in the range of 10 to 99.5% by weight. Another embodiment of the present invention provides a method for improving the dissolution rate of N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl }-L-phenylalanine 1-methyl ester, which includes, prior to dissolving the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl }-L-phenylalanine 1-methyl ester, admixing the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl }-L-phenylalanine 1-methyl ester with Aspartame, wherein a ratio of the Aspartame to a total amount of the N-{N-(3,3-dimethylbutyl)-L&agr;-aspartyl}-L-phenylalanine 1-methyl ester and the Aspartame is in the range of 10 to 99.5% by weight.
摘要:
A homogeneous sweetener composition containing aspartame (APM) and N-[N-(3,3-dimethylbutyl)-L-&agr;-aspartyl]-L-phenylalanine methyl ester having tasting properties similar to sucrose, can be efficiently produced in high yields and with a high purity by reductive alkylation of APM with an at most equimolar amount 3,3-dimethylbutylaldehyde followed by separating the reducing agent from the liquid reaction mixture, and separating of the precipitated crystals of the sweetener composition.
摘要:
A process for easily and efficiently separating aspartame (APM) from N-[N-(3,3-dimethylbutyl)-L-(&agr;-aspartyl]-L-phenylalanine methyl ester (APM derivative), and thus separating and purifying the APM and the above-mentioned APM derivative, more specifically the N-(3,3-dimethylbutyl)-APM each at a high purity, which comprises subjecting an aqueous solution containing the APM and the APM derivative, to column chromatography using a nonpolar highly porous polymer based resin.
摘要:
One embodiment of the present invention provides a sweetener composition, which includes a mixture of N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester, and Acesulfame K, wherein a ratio of the Acesulfame K to a total amount of the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester and the Acesulfame K is in the range of 10 to 97% by weight, methods of making and of using. Another embodiment of the present invention provides a method for preparing a sweetener composition, which includes drying an A-type crystal of N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester to obtain a C-type crystal of N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester. Another embodiment of the present invention provides a method for producing a sweetener, which includes admixing N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester with Acesulfame K, wherein a ratio of the Acesulfame K to a total amount of the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester and the Acesulfame K is in the range of 10 to 97% by weight. Another embodiment of the present invention provides a method for improving the dissolution rate of N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester, which includes, prior to dissolving the N-{N-(3,3 -dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester, admixing the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester with Acesulfame K, wherein a ratio of the Acesulfame K to a total amount of the N-{N-(3,3-dimethylbutyl)-L-&agr;-aspartyl}-L-phenylalanine 1-methyl ester and the Acesulfame K is in the range of 10 to 97% by weight.
摘要:
There is provided a novel mixed crystal comprising aspartame (APM) and N-[N-(3,3-dimethylbutyl)-L-&agr;-aspartyl]-L-phenylalanine methyl ester, which can be used as a sweetener having considerably improved quality of sweetness, etc. The above mixed crystal can be easily produced industrially by subjecting a solution containing the above-mentioned APM and APM derivative to a crystallizing operation followed by the separation of the mixed crystal thus precipitated.
摘要:
In an optical disk reproducing device capable of rotating an optical disk at a selected one of a plurality of preset linear velocities, vibration or shock of the device is detected during rotation of the disk, and the linear velocity of the disk is determined based on the result of the detection of the vibration or shock to restrain the vibration and shock within a permissible range. A limit rotational velocity above which the vibration or shock is excessive may be determined during a test conducted each time a disk is inserted, and the linear velocity of the disk during reproduction may be determined such that the rotational velocity does not exceed the limit rotational velocity.
摘要:
In a multi-disk player having a loading and unloading equipment for selecting an arbitrary disk cassette from a containing portion for containing a plurality of trays each supporting one disk cassette in which a disk-shaped record medium is contained in a cassette case with they being arranged in a lot of upper and lower stages, loading the selected disk cassette into a record playing equipment disposed behind the containing portion and returning the same to its original position in the containing portion from the recording playing equipment after the playing of the disk cassette is terminated,the containing portion has a plurality of ejecting operating means for each releasing a locking function for disk cassette so that the operating means corresponding to an arbitrary disk cassette in the containing portion is operated to eject the disk cassette toward the front of the containing portion.