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How Amino Acids Are Manufactured

L, DL-Alanine L-Arginine L-Aspartic Acid L-Cysteine Hydrochloride Monohydrate L-Cystine L-Glutamic Acid L-Glutamine Glycine L-Histidine L-Isoleucine   L-Lysine Monohydrochloride L-Leucine L-Methionine L-Phenylalanine L-Proline L-Serine L-Threonine L-Tryptophan L-Tyrosine L-Valine

 

*Contact
Amino Acid Department
AminoScience Division
AJINOMOTO CO,.INC.
(Tokyo,Japan)
15-1, Kyobashi 1-Chome, Chuo-ku, Tokyo 104-8315 Japan
TEL:81(3)5250-8209
FAX:81(3)5250-8273

email:webmaster@ms.Ajinomoto.co.jp

	Amino acid ==================== -------Amino and Nucleic Acids Provide the Foundation------- Amino and Nucleic Acids Provide the Foundation -------Characteristics of Amino Acids------- Classification and Structural formulas Melting Point Teste Solubility Primary Applications -------The 20 Main Amino Acids------- The 20 Main Amino Acids -------Amino Acids and Amino Acid-related Products------- Amino Acids and Amino Acid-related Products Amino Acid-based Ingredients for Cosmetics and Toletries Amino Acids for Animal Nutrition Pharmaceutical Intermediates -------Contact------- Contact

 

 

1.	Characteristics
	Crystal system	hexagonal system
	Melting point	260°C(decomposition)
	Specific rotation	= -220° ~ -225°(1N HCl, c=2)
	Solubility	(H2O,g/dl)   0.011(25°),   0.0239(50°),   0.0523(70°),   0.114(100°)
	Dissociation constant	pKCOOH<1  pKCOOH=2.1  pKNH3+=8.02  pKNH3+=8.71  pI=5.03
	Stability	L-Cystine decomposes in hot alkaline aqueous solution.
2.	Properties
	L-Cystine is a form that two molecules of L-Cysteine bind together by disulfide bonding. When reduced L-Cysteine is formed. L-Cystine is contained in many proteins and makes an important contribution to the determination of protein structure as L-Cystine is first incorporated in the protein chain in the form of L-Cysteine, and as the residual group of two molecules of L-Cysteine is thought to be oxidized to form L-Cystine.
	Derivatives	Dibenzoyl-L-Cystine : mp 180°C Di-p-Toluenesulfonyl-L-Cystine : mp 204°C
	Metabolism	Glycogenic. L-Cystine undergoes a reciprocal conversion with L-Csyteine in the oxidation-reduction mechanism. It is metabolized to form pyruvic acid. L-Cystine and L-Cysteine are not essential for human as L-Cysteine is derived from L-Methionine. L-Cystine is known to be necessary for the formation of skin and accelerates healing after surgery or injury. Also, it stimulates the hematopoietic system and promotes leucocyte formation.

 

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