L-leucine

We are offering l-leucine.
name l-leucine
synonyms l-2-amino-4-methylpentanoic acid; (s)-2-amino-4-methylpentanoic acid; l-leu
molecular formula c6h13no2
molecular weight 131.17
cas registry number 61-90-5
einecs 200-522-0
fema 3297
properties
melting point 286-288 ºc
sublimation 145-148 ºc
alpha 15.4 º (c=4, 6n hcl)
water solubility 22.4 g/l (20 c)
reference standard: aji92
specifications:
item standard
appearance white crystals or crystalline powder
specific rotation[α]20/d
(c=4 in 6n hcl) +14.9 to +16.0°
state of solution
(transmittance) clear and colorless
not less than 98.0%
chloride (cl) not more than 0.020%
ammonium (nh4) not more than 0.02%
sulfate (so4) not more than 0.020%
iron (fe) not more than 10ppm
heavy metal(pb) not more than 10ppm
arsenic(as2o3) not more than 1ppm
other amino acids chromatographically
not detectable
loss on drying not more than 0.20%
residue on ignition(sulfated) not more than 0.10%
assay 98.5 to100.5%
ph 5.5 to 6.5