D-组氨酸351-50-8
Item
Standard
Analysis data
Appearance
White
crystals or crystalline powder
conforms
Specific
rotation[α]20/D
-11.8
to -12.8°
-11.83°
State
of solution
(Transmittance)
Not
less than 95.0%
97.9%
Chloride
(Cl)
Not
more than 0.10%
0.015%
Heavy
metal(Pb)
Not
more than 10ppm
<10ppm
Arsenic(As2O3)
Not
more than 2ppm
<2ppm
Loss
on drying
Not
more than 0.20%
0.2%
Residue on ignition(sulfated)
Not
more than 0.2%
0.085%
Assay
98.0
to101.0%
98.8%
Conclusion
The
product conforms to the standard.
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