METHOD OF IMPROVING STORAGE STABILITY OF SUBSTANCE
The present invention relates to a method of improving storage stability of reduced form of nicotinamide adenine dinucleotide, reduced form of nicotinamide adenine dinucleotide phosphate, or a salt thereof, or ascorbic acid, an ascorbic acid derivative, or a salt thereof, which comprises allowing the substance to coexist with an L-arginine acidic amino acid salt, a composition containing the substance and an L-arginine acidic amino acid salt, a process for producing the composition, and a method of storing the substance in the presence of an L-arginine acidic amino acid salt.
1 . A method of improving storage stability of NAD(P)H, or a salt thereof, or ascorbic acid, an ascorbic acid derivative, or a salt thereof, which comprises allowing NAD(P)H or a salt thereof, or ascorbic acid, an ascorbic acid derivative, or a salt thereof to coexist with an L-arginine acidic amino acid salt.
2 . A process for producing a composition which comprises a step of mixing NAD(P)H or a salt thereof, or ascorbic acid, an ascorbic acid derivative, or a salt thereof with an L-arginine acidic amino acid salt.
3 . The method according to claim 2 , wherein the composition is a preparation further comprising a comestible carrier.
4 . A composition comprising NAD(P)H or a salt thereof, or ascorbic acid, an ascorbic acid derivative, or a salt thereof and an L-arginine acidic amino acid salt.
5 . A preparation comprising NAD(P)H or a salt thereof, or ascorbic acid, an ascorbic acid derivative, or a salt thereof, an L-arginine acidic amino acid salt and a comestible carrier.
6 . (canceled)