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L-Valin Produkt Beschreibung

Englisch Name:L-Valine
L-Valin physikalisch-chemischer Eigenschaften
Schmelzpunkt:: 295-300 °C (subl.)(lit.)
alpha : 28 º (c=8, 6N HCl)
Dichte: 1.23
Brechungsindex: 28 ° (C=8, HCl)
storage temp. : Store at RT.
Löslichkeit: H2O: 25 mg/mL
Aggregatzustand: powder
pka: 2.29(at 25℃)
Farbe: White
PH: 5.5-6.5 (100g/l, H2O, 20℃)
Optische Aktivität: [α]20/D +27.0±0.5°, c = 5% in 5 M HCl
Wasserlöslichkeit: 85 g/L (20 ºC)
maximale Wellenlänge (λmax): λ: 260 nm Amax: 0.15
λ: 280 nm Amax: 0.1
Merck : 14,9909
BRN : 1721136
CAS Datenbank: 72-18-4(CAS DataBase Reference)
NIST chemische Informationen: Valine(72-18-4)
Kennzeichnung gefährlicher: Xn
R-Sätze:: 40
S-Sätze:: 24/25-36-22
WGK Germany : 3
RTECS-Nr.: YV9361000
TSCA : Yes
HS Code : 29224995

L-Valin Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R40:Verdacht auf krebserzeugende Wirkung.
S-Sätze Betriebsanweisung:
S24/25:Berührung mit den Augen und der Haut vermeiden.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S22:Staub nicht einatmen.
Valine (abbreviated as Val or V) is an α-amino acid with the chemical formula HO2CCH(NH2)CH(CH3)2. L-Valine is one of 20 proteinogenic amino acids. Its codons are GUU, GUC, GUA, and GUG. This essential amino acid is classified as nonpolar. Human dietary sources are any proteinaceous foods such as meats, dairy products, soy products, beans and legumes.
Along with leucine and isoleucine, valine is a branched-chain amino acid. It is named after the plant valerian. In sickle-cell disease, valine substitutes for the hydrophilic amino acid glutamic acid in hemoglobin. Because valine is hydrophobic, the hemoglobin is prone to abnormal aggregation.
Chemische Eigenschaften
White or almost white, crystalline powder or colourless crystals, soluble in water, very slightly soluble in alcohol.
L-Valine is an essential amino acid and one of 20 proteinogenic amino acids. L-Valine cannot be manufactured by the body and must be acquired through diet or supplementation. L-valine is found in grai ns, dairy products, mushrooms, meats, peanuts and soy proteins. L-Valine has been used in studies to attenuate arrhythmias and induce hypotensive effects.
valine is an amino acid used as a skin-conditioning and odor-masking agent. It is more commonly used in hair care preparations than in skin care.
ChEBI: The L-enantiomer of valine.
Valine is an essential amino acid, hence it must be ingested, usually as a component of proteins. It is synthesized in plants via several steps starting from pyruvic acid. The initial part of the pathway also leads to leucine. The intermediate α-ketoisovalerate undergoes reductive amination with glutamate. Enzymes involved in this biosynthesis include :
Acetolactate synthase
Acetohydroxy acid isomeroreductase
Dihydroxyacid dehydratase
Valine aminotransferase.
Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.
Chemical Synthesis
Racemic valine can be synthesized by bromination of isovaleric acid followed by amination of the α-bromo derivative
HO2CCH2CH(CH3)2 + Br2 → HO2CCHBrCH(CH3)2 + HBr
HO2CCHBrCH(CH3)2 + 2 NH3 → HO2CCH(NH2)CH(CH3)2 + NH4Br
läuterung methode
Crystallise L-valine from water by addition of EtOH. It sublimes at 178-188o/0.03mm with 99.3% recovery and unracemised [Gross & Gradsky J Am Chem Soc 77 1678 1955]. [Perrin J Chm Soc 3125 1958, Greenstein & Winitz The Chemistry of the Amino Acids J. Wiley, Vol 3 pp 2368-23771961, Beilstein 4 IV 2659.]
According to IUPAC, carbon atoms forming valine are numbered sequentially starting from 1 denoting the carboxyl carbon, whereas 4 and 4' denote the two terminal methyl carbons.
L-Valin Upstream-Materialien And Downstream Produkte
Glucose Hydantoin Isobutanol Glutaminsure DL-Valin Harnstoff Cyanwasserstoff Isobutyraldehyd Diammoniumcarbonat Isobutyronitril
Downstream Produkte
L-Valin Anbieter Lieferant Produzent Hersteller Vertrieb Händler.      Global( 524)Lieferanten     
Firmenname Telefon Fax E-Mail Land Produktkatalog Edge Rate
Capot Chemical Co.,Ltd.
+86 (0)571-855 867 18
+86 (0)571-858 647 China 19919 60
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259 CHINA 3203 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21930 58
Shanghai Bojing Chemical Co.,Ltd.
+86-21-37122233 CHINA 495 55
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20680 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32457 55
Nanjing ChemLin Chemical Industry Co., Ltd.
025-83697070; CHINA 3015 60
Shanghai Yingrui Biopharma Co., Ltd.
+86-21-33585366 CHINA 661 60
Nanjing Finetech Chemical Co., Ltd.
025-85710122 17714198479 CHINA 892 55
+86 21 5161 9050/ 5187 7795
+86 21 5161 9052/ 5187 CHINA 24196 60
72-18-4(L-Valin)Verwandte Suche:
DL-Phenylalanin L-Prolin Arginin Lithiumbis(trimethylsilyl)amid Methyl-4-(4-aminophenyl)butyrat ALTRENOGEST phosphoric acid N,N-Dimethyl-phenylendiamin (p) 4-Aminobuttersure L-Valine methyl ester hydrochloride Glycin Folsure Valine N-[(tert-Butoxy)carbonyl]-L-valin DL-Valin Isovaleriansäure AMINO ACIDS L-Valin
L-Valine (High Purity ) 2,3-D2) L-Valine, Animal-Free L-VALINE BIOULTRA, >= 99.5% (NT) L-VALINE, REAGENT GRADE, >=98% (HPLC L-ValineUSP, 98.5-101.5% (Titration: anhydrous basis) L-Valine,99%e.e. (S)-(+)-VALINE (S)-ALPHA-AMINOISOVALERIC ACID VALINE, L- VALINE 2-AMINO-3-METHYLBUTANOIC ACID 2-AMINOISOVALERIC ACID H-VAL-OH H-L-VAL-OH L-2-AMINO-3-METHYLBUTANOIC ACID L-2-AMINO-3-METHYLBUTYRIC ACID L-2-AMINOISOVALERIC ACID L-A-AMINOISOVALERIC ACID L-ALPHA-AMINOISOVALERIANIC ACID L-VLA L-(+)-VALINE L-VALINE Valin (S)-α-Aminoisovaleric acid L-Valine, FCC Grade L-2-Amino-3-methylbutyric acid, FCC Grade L-Val-OH La-Amino-b-methylbutyric acid L-Valine FCC4/USP24 L-VALINE (USP/EP/JP) L-VALINE, MANUFACTURING GRADE L-VALINE 99% CELL CULTURE REAGENT L-VALINE 99-105% (USP EP JP) L-ValineForBiochemistry L-ValineForBiochemistry99+% L-ValineForBiochemistry-(S)-A-AminoisovalericAcid L-VALINE 99% FOR BIOCHEMISTRY L-Valine-D8, 15N L-VALINE,CRYSTAL L-VALINE,CRYSTAL,FCC VALINE,CRYSTAL,USP (2S)-2-amino-3-methyl-butanoic acid VALINE, L-(RG) (S)-a-Amino-b-methylbutyric acid L-Valine (9CI) (s)-2-amino-3-methylbutanoicacid (S)-2-Amino-3-methylbutansαure (s)-2-amino-3-methylbutyricacid (s)-alpha-amino-beta-methylbutyricacid 2-Amino-3-methylbutyric acid Butanoic acid, 2-amino-3-methyl- Butanoic acid, 2-amino-3-methyl-, (S)- l-(+)-alpha-Aminoisovaleric acid l-alpha-amino-beta-methylbutyricacid L-iso-C3H7CH(NH2)COOH L-α-Amino-isovaleriansαure L-Valine >99.5% L-VALINE extrapure CHR
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