| |
 |
 |
|
| L-Tyrosine |
|
| Chemical Name： |
3-(4-Hydroxyphenyl)-L-alanine |
|
Structure Formula：
|
 |
|
Molecular Formula：
|
C9H11NO3 |
|
Molecular Weight：
|
181.19
|
|
Cas No：
|
[60-18-4] |
|
Characteristics：
|
White,
styli form crystals with bitterness, soluble in dilute acids or base |
|
Quality
Standards：
|
USP24,
AJI97 and etc. |
|
Item
|
Specifications
|
|
USP24
|
AJI97
|
|
Appearance
|
White
crystals or crystalline powder; tasteless
|
|
Assay,%
|
98.5~101.5
|
99.0~101.0
|
|
Specific
optical rotation
|
-9.8°~
-11.2°
|
-11.3°~
-12.1°
|
|
Transmittance,
%
|
-
- -
|
≥98.0
|
|
Heavy
Metals (as Pb), %
|
≤0.001
|
≤0.001
|
|
pH
value
|
-
- -
|
5.0~6.5
|
|
Loss
on drying, %
|
≤0.3
|
≤0.2
|
|
Residue
on ignition, %
|
≤0.4
|
≤0.1
|
|
Chloride
(as Cl),%
|
≤0.04
|
≤0.02
|
|
Ammonium
(as NH4),%
|
-
- -
|
≤0.02
|
|
Sulfate
(as SO4), %
|
≤0.04
|
≤0.02
|
|
Iron,
%
|
≤0.003
|
≤0.001
|
|
Arsenic
(as As), %
|
≤0.0001
|
≤0.0001
|
|
Other
amino acids
|
-
- -
|
Not
detd.
|
|
Organic
volatile impurities
|
Meets
the requirement
|
-
- -
|
|
|
The
Characteristics and Uses：
|
One of essential materials to prepare all kinds
of medicine such as L-topa |
|
Package
and Transport：
|
Fiber drum double polyethylene bags inside (25kgs) |
|
Storage：
|
Cool, dry, dark in closed containers, recommended
limit 2 year. |
|
|
