L-pyr pyroglutamic acid (S)-(-)-2-Pyrrolidone-5-carboxylic acid
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Product Name: L-Pyroglutamic Acid
CAS#: 98-79-3
Synonyms:(S)-(-)-2-Pyrrolidone-5-carboxylic acid
Molecular Formula: C5H7NO3
Molecular Weight: 129
Specification: (Reference Standard AJI92)
Item |
Standard |
Analysis data |
Appearance |
White crystalline powder |
Conforms |
Specific rotation(a)D20 |
-10 to -12o |
-11.6o |
Transmittance |
Not less than 98.0% |
98.2% |
Melting Point (oC) |
160 to 162 oC |
161oC |
Chloride(C1) |
Not more than 0.02% |
0.005% |
Ammonium(NH4) |
Not more than 0.02% |
<0.02% |
Sulfate(SO4) |
Not more than 0.02% |
<0.02% |
Heavy metals(Pb) |
Not more than 10ppm |
<10ppm |
Iron(Fe) |
Not more than 10ppm |
5ppm |
Arsenic(As2O3) |
Not more than 1 PPM |
<1ppm |
Loss on drying |
Not more than 0.50% |
0.35% |
Residue on ignition |
Not more than 0.1% |
0.08% |
Assay |
99.0-101.0% |
99.8% |
Remark:Easy to moisture-absorbed; store in dry、dark、ventilated place.
Laboratory Picture:
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