L-Pyroglutamic acid

Melting point :160-163 °C(lit.)
Boiling point :239.15°C (rough estimate)
alpha :-27.5 º (c=10, 1 N NaOH)
Density :1.3816 (rough estimate)
vapor pressure :0.002Pa at 25℃
refractive index :-10 ° (C=5, H2O)
storage temp. :2-8°C
solubility :H₂O: 1 M at 20 °C, clear, colorless
pka :3.32(at 25℃)
form :Crystalline Powder
color :White to off-white
PH :1.7 (50g/l, H2O, 20℃)
Odor :wh. crystal, odorless, sl. acidic taste
optical activity :[α]20/D 10.5±1°, c = 5% in H2O
Water Solubility :10-15 g/100 mL (20 ºC)
Merck :14,8001
BRN :82132
Stability :Stable. Incompatible with bases, acids, strong oxidizing agents.
Major Application :peptide synthesis
Cosmetics Ingredients Functions :HUMECTANT
MOISTURISING InChI :1S/C5H7NO3/c7-4-2-1-3(6-4)5(8)9/h3H,1-2H2,(H,6,7)(H,8,9)/t3-/m0/s1
InChIKey :ODHCTXKNWHHXJC-VKHMYHEASA-N
SMILES :OC(=O)[C@@H]1CCC(=O)N1
LogP :-1.233 at 20℃
CAS DataBase Reference :98-79-3(CAS DataBase Reference)
NIST Chemistry Reference :Pidolic acid(98-79-3)
EPA Substance Registry System :5-Oxo-L-proline (98-79-3)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405 Store locked up.