摘要:
Novel aspartyldipeptidoamides and salts thereof. The apartyldipeptides are useful as a low-calorie sweetener for food and beverage products and have excellent taste and chemical stability.
摘要:
The present specification discloses a ruminant feed additive composition which contains as an active ingredient a phosphoric acid-amino acid-polyvalent metal composite salt (final composite salt) which is insoluble in neutral or alkaline water and is soluble in acidic water and which can be obtained by treating a composite salt composed of a basic amino acid, magnesium and phosphoric acid with a salt of a divalent or trivalent (polyvalent) metal other than magnesium, or by treating the above-mentioned composite salt with the polyvalent metal salt and a condensed phosphoric acid component (alone) or the condensed phosphoric acid component and a phosphoric acid component (in combination), this composition taking the form of a powder or granules. The above-mentioned final composite salt can exhibit the excellent stability to neutral or slightly acidic water, namely, the low solubility therein in comparison with the intermediate composite salt, and it can have both the excellent insolubility of the basic amino acid in a rumen of a ruminant and the excellent elution thereof in an abomasum and lower digestive organs.
摘要:
Aspartyldipeptide compounds of the formula (I) L-Asp-X-NH-C*R.sub.1 R.sub.2 (I) where R.sub.1 is alkyl or alkoxymethyl, R.sub.2 is phenyl, benzyl, cyclohexyl or cyclohexylmethyl, C* has an (S) configuration when R.sub.1 is alkyl and an (R) configuration when R.sub.1 is alkoxymethyl and X is a residue of a D-.alpha.-amino acid, a DL-.alpha.-amino acid or a residue of a cyclic or acyclic .alpha.,.alpha.-diallylamino acid and the bond between L-Asp and X is an .alpha.-bond; and their use as active ingredients in sweetener compositions.
摘要:
The present invention provides a method of preparing L-aspartyl-D-.alpha.-aminoalkane carboxylic acid-(S)-N-.alpha.-alkylbenzylamide which is less expensive and more efficient than previous methods using N-protected-L-aspartic anhydride.
摘要:
Discloses an aluminium brazing paste which not only has excellent preservability and coating performance but also reveals excellent brazing characteristics; said aluminium brazing paste according to this invention comprises, per 100 parts by weight of aluminum-containing metal powder with 10 to 500 .mu.m of mean particle size for aluminium brazing, of 0.5 to 15 parts by weight of flux and 30 to 80 parts by weight of a liquid polyisobutylene with 300 to 1500 of average molecular weight and/or its hydrogenated product.
摘要:
A process is described for the synthesis of N-protected-L-.alpha.-aspartyl-L-phenylalanine by both (a) the reaction of an N-protected-L-aspartic anhydride and a R.sub.1 -L-phenylalanine, and (b) the reaction of an N-protected-L-aspartic anhydride and L-phenylalanine in an aqueous medium in the presence of R.sub.2, where R.sub.1 may be an alkali metal salt, alkaline earth metal salt, ammonium salt or organic amine salt, and R.sub.2 may be an ammonium salt or an alkali or alkaline earth metal salt of an inorganic or organic acid.
摘要:
The invention relates to a process for producing N-protected-.alpha.L-aspartyl-L-phenylalanine methyl ester, which comprises esterifying L-phenylalanine with methanol in the presence of a strong acid catalyst, adding, to the resulting solution, an aqueous alkaline solution to neutralize the acid catalyst and a water-immiscible organic solvent to extract the free L-phenylalanine methyl ester thus formed, collecting the organic layer, and reacting the L-phenylalanine methyl ester dissolved in said collected organic layer with N-protected-L-aspartic anhydride.
摘要:
A method of preparing .alpha.-L-phenylalanine methyl ester and its hydrochloride, which comprises dissolving .alpha.-L-aspartyl-L-phenylalanine .beta.-methyl ester in a methanol/hydrochloric acid mixture solvent which contains, when hydrochloric acid is expressed in terms of concentrated hydrochloric acid and water, 0 to 20% by volume of methanol, 8 to 55% by volume of concentrated hydrochloric acid and water (balance) in a concentration from 0.01 mol/dl to 0.3 mol/dl; holding the solution at 0.degree. to 60.degree. C. to effect intramolecular ester exchange reaction and crystallize out the formed .alpha.-L-aspartyl-L-phenylalanine methyl ester as its hydrochloride; isolating the hydrochloride; and obtaining, when required, the free ester by neutralization with an alkali, is disclosed.
摘要:
The present invention relates to a process for producing efficiently glutamic acid derivatives (including salts thereof) such as monatin by converting a substituted α-keto acid of formula (1) into a glutamic acid derivative of formula (2) in the presence of an enzyme catalyzing conversion of the same.