L-Asparagine monohydrate, Pharmpur®, Ph Eur, BP

- Synonyms: Asparaginic acid semiamide
- C4H8N2O3·H2O
- M = 150,14 g/mol
- CAS [5794-13-8]
- EINECS-No.: 200-735-9
- Solub. in water: (20 ºC): 22 g/l
- Melting point: 215 - 217 ºC (decomposes)
- Tariff number: 2924 19 00 90
- Applications: in biochemistry, for pharmaceutical use, in food industry, synthesis of organic products, in pharma industry.

SPECIFICATIONS
assay (titration with HClO4, on dried sample) : 99,0 - 101,0 %
identity (IR-spectrum): passes test
Identification TLC: passes test
appearance of solution (2 %, H2O): clear and colourless
specific rotation (20º/D, c=10, HCl 10%) : + 33,7 º - + 36,0 °
pH (2 %, H2O): 4,0 - 6,0
chlorides (Cl): max. 200 ppm
sulfates (SO4): max. 200 ppm
ammonium (NH4): max. 0,1 %
iron (Fe): max. 10 ppm
residue on ignition: max. 0,1 %
loss on drying (60 °C, 24 h) : 10,5 - 12,5 %

aspartic acid: max. 0,5 %
2,2'-[(2?,5?)-3,6-dioxopiperazine-2,5-diyl]diacetamide: max. 0,1 %
any unspecified impurities: max. 0,05 %
total : max. 0,8 %