China (Mainland) 
product name: l-theanine
cas#: 3081-61-6
molecular formula: c7h14n2o3
molecular weight: 174.2
specification:
|
item |
standard |
|
appearance |
white crystalline powder |
|
specific rotation(a)d20 (c=1 , h2o ) |
+7.7° to +8.5° |
|
solubility (1.0g/20ml h2o) |
clear colorless |
|
melting point (℃) |
211-216 ℃ |
|
chloride(c1) |
not more than 0.02% |
|
iron(fe) |
not more than 10ppm |
|
heavy metals( pb ) |
not more than 10ppm |
|
arsenic(as2o3 ) |
not more than 4ppm |
|
loss on drying( 100 ℃ 3h) |
not more than 0.50% |
|
residue on ignition |
not more than 0.2% |
|
assay |
98.0-102.0% |
|
ph |
5.0~6.0 |