L-Threonine

Threonine 

IUPAC name

Threonine

Other names

2-Amino-3-hydroxybutanoic acid

Identifiers 

CAS number

80-68-2 , 
72-19-5 (L-isomer)

PubChem

6288

ChemSpider

6051 

EC number

201-300-6

SMILES

C[C@H]([C@@H](C(=O)O)N)O

InChI

InChI=1S/C4H9NO3/c1-2(6)3(5)4(7)8/h2-3,6H,5H2,1H3,(H,7,8)/t2-,3+/m1/s1
Key: AYFVYJQAPQTCCC-GBXIJSLDSA-N

Properties 

Molecular formula

C₄H₉NO₃

Molar mass

119.12 g mol⁻¹

Acidity (pK_a)

2.63 (carboxyl), 10.43 (amino)

Supplementary data page 

Structure and
properties

n, ε_r, etc.

Thermodynamic
data

Phase behaviour
Solid, liquid, gas

Spectral data

UV, IR, NMR, MS

Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

ITEM

SPECIFICATION             

Appearance

White Crystal Powder

Specific Rotation[α]20D

-26°~-29.0°                 

State of solution

Clear & colorless         

Chloride(Cl)

0.020% Max.            

Heavy Metals (As Pb)

10ppm Max.                

Arsenic(As2O3)

1ppm Max.                 

Other amino acids

Chromatographically not detectab 

Loss on Drying

0.20% Max.              

Residue on Ignition (Sulfated)

0.40% Max.              

Assay

98.0% Min                

PH

5.5 to 6.5