492 L-Valine Monographs FCCV

492/ L-Valine/ Monographs FCCV
L-Valine
L-2-Amino-3-methylbutyricAcid
CH3CHCCOOH
H3CHNH2
C5H11NO2 Formulawt117.15
CAS:[72-18-4]
DESCRIPTION
L-Valineoccursasawhite,crystallinepowder.Itisfreely
solubleinwater,andpracticallyinsolubleinalcoholandin
ether.ThepHofa1:20aqueoussolutionisbetween5.5and
7.0.Inaclosedcapillarytube,itmeltsatabout315°.
Function Nutrient.
REQUIREMENTS
Identification Theinfraredabsorptionspectrumofthesam-
pleexhibitsrelativemaximaatthesamewavelengthsasthose
ofatypicalspectrumasshowninthesectionon Infrared
Spectra,usingthesametestconditionsasspecifiedtherein.
Assay Notlessthan98.5%andnotmorethan101.5%of
C5H11NO2,calculatedonthedriedbasis.
Lead Notmorethan5mg/kg.
LossonDrying Notmorethan0.3%.
Optical(Specific)Rotation []D
20°
:Between+26.7°and
+29.0°,calculatedonthedriedbasis;or[]D
25°
:Between
+26.6°and+28.9°,calculatedonthedriedbasis.
ResidueonIgnition Notmorethan0.1%.
TESTS
ResidueonIgnition Determineasdirectedunder Residue
onIgnition,AppendixIIC,ignitinga1-gsample.
PackagingandStorage Storeinwell-closedcontainers.
VegetableOilPhytosterolEsters
5
6
7
8
R2
22
2325
26
R1
R1 = H, ∆5
 (Cholesterol)
R1 = CH3, ∆5, ∆22 (Brassicasterol)
R1 = CH3, ∆5
 or = CH3 (Campesterol)
R1 = C2H5, ∆5
, ∆22
  (Stigmasterol)
R1 = C2H5, ∆5
 or = C2H5 (β-Sitosterol)
R1 = C2H5, ∆5
, ∆25 
(∆5
-Avenasterol)
R1 = C2H5, ∆7 (∆7-Stigmastenol = ∆7-β-Sitosterol)
R1 = C2H5, ∆7
, ∆25 
(∆7
-Avenasterol)
R2 = Vegetable oil derived fatty acid
∆5
 = double C bond at 5,6 position
7
View IR638