成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

L(+)-2-Aminobutyric acid

L(+)-2-Aminobutyric acid ??? ???
?? ??:
1492-24-6
???:
L(+)-2-Aminobutyric acid
???(??):
AMINOBUTYRIC ACID;L-2-AMINOBUTYRIC ACID;2-AMINOBUTANOIC ACID;L-ABU;H-ABU-OH;L-ALPHA-AMINOBUTYRIC ACID;L-2-AMINOBUTANOIC ACID;L-2-Abu;L-ABU-OH;Z-&gamma
CBNumber:
CB3741533
???:
C4H9NO2
??? ??:
103.12
MOL ??:
1492-24-6.mol
MSDS ??:
SDS

L(+)-2-Aminobutyric acid ??

???
300 °C
?? ?
215.2±23.0 °C(Predicted)
??
21.6 º (c=2, 5N HCl)
??
1.2300 (estimate)
???
1.4650 (estimate)
?? ??
room temp
???
22.7g/100mL(22°C)
?? ?? (pKa)
2.29(at 25℃)
??? ??
??? ??
??
???? ????
???? ??
Porcine kidney
microbial
plant
???
22.7g/100mL(22ºC)
Merck
14,428
BRN
1720935
InChIKey
QWCKQJZIFLGMSD-VKHMYHEASA-N
CAS ??????
1492-24-6(CAS DataBase Reference)
NIST
(l)-2-Aminobutanoic acid(1492-24-6)
EPA
Butanoic acid, 2-amino-, (2S)- (1492-24-6)
??
  • ?? ? ?? ??
  • ?? ? ???? ?? (GHS)
??? ?? Xi
?? ???? ?? 43
????? 36/37
WGK ?? 3
?? ?? ?? Irritant
TSCA Yes
HS ?? 29224999
????(GHS): GHS hazard pictograms
?? ?: Warning
??·?? ??:
?? ??·?? ?? ?? ?? ?? ?? ? ?? ?? P- ??
H317 ????? ?? ??? ??? ? ?? ?? ??? ?? ?? 1 ?? GHS hazard pictograms P261, P272, P280, P302+P352,P333+P313, P321, P363, P501
??????:
P280 ????/???/???/?????? ?????.
NFPA 704
0
1 0

L(+)-2-Aminobutyric acid MSDS


L-2-Aminobutanoic acid

L(+)-2-Aminobutyric acid C??? ??, ??, ??

??? ??

White Crystalline Solid

??

ChEBI: An optically active form of alpha-aminobutyric acid having L-configuration.

?? ??

L-2-Aminobutyric acid is synthesized from L-threonine and L-aspartic acid through a ?-transamination reaction. It is an L-alanine analogue with an ethyl side chain.

Synthesis

The preparation of l-2-aminobutyric acid (l-ABA) is mainly achieved by chemical synthesis or enzymatic conversion. In chemical methods, synthesis of l-ABA has been extensively reported, including ammonolysis of α-halogen acid, reduction reaction, ammoniation hydrolysis reaction and butanone acid reduction. However, the obvious disadvantages of chemical synthesis, such as poor selectivity, harsh reaction conditions, various byproducts, and the difficulty in separation and purification, limited its development. It is reported that l-ABA was synthesized in a transamination reaction from α-ketobutyric acid and l-aspartic acid as substrates using aromatic aminotransferase or produced from α-ketobutyric acid and benzylamine using ω-aminotransferase. l-ABA could also be produced from the reduction of α-keto acids with l-leucine dehydrogenase or glutamate dehydrogenase[1].

Purification Methods

Crystallise butyrine from aqueous EtOH, and the melting point depends on heating rate but has m 303o in a sealed tube. [Greenstein & Winitz The Chemistry of the Amino Acids J. Wiley, Vol 3 p 2399 IR: 2401 1961, Beilstein 4 III 1294, 4 IV 2584.]

L(+)-2-Aminobutyric acid ?? ?? ? ???

???

?? ??


L(+)-2-Aminobutyric acid ?? ??

???( 659)?? ??
??? ?? ??? ?? ?? ? ??
Jiangxi Chiyan Biopharmaceutical Technology Co.,Ltd.
+86-18616643091 +86-18616643091
info@rochipharma.com China 246 58
Zibo Hangyu Biotechnology Development Co., Ltd
+86-0533-2185556 +8617865335152
Mandy@hangyubiotech.com China 10986 58
Beijing Toachem Chemical Co.,Ltd
+8618311365218
sales@toachem.com China 184 58
Hebei Weibang Biotechnology Co., Ltd
+8615531157085
abby@weibangbio.com China 8803 58
Hebei Mujin Biotechnology Co.,Ltd
+86 13288715578 +8613288715578
sales@hbmojin.com China 12825 58
Hangzhou ICH Biofarm Co., Ltd
+86-0571-28186870; +undefined8613073685410
sales@ichemie.com China 1015 58
Sichuan HongRi Pharma-Tech Co.,Ltd
+86-028-64841719 +8617390183901
daisy@enlaibio.com China 1106 58
HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD
+8615350851019
admin@86-ss.com China 1001 58
Hebei Zhuanglai Chemical Trading Co Ltd
+86-16264648883 +86-16264648883
niki@zlchemi.com China 3712 58
Capot Chemical Co.,Ltd.
+86-(0)57185586718 +86-13336195806
sales@capot.com China 29792 60

L(+)-2-Aminobutyric acid ?? ??:

Copyright 2019 ? ChemicalBook. All rights reserved