L-pyroglutamic acid has its scientific name being L-2-pyrrolidone-5-carboxylic acid. Precipitation from ethanol and petroleum ether mixture were colorless orthorhombic bipyramid crystals with the melting temperature being 162~163 °C. It is soluble in water, alcohol, acetone and acetic acid, slightly soluble in ethyl acetate, and insoluble in ether. Specific rotation-11.9 ° (c = 2, H2O). It is produced from 42% aqueous solution of glutamic acid which subjects to heating dehydration, concentration, crystallization, washing and drying to obtain L-pyroglutamic acid.
용도
L-Pyroglutamic acid is an amino acid that is used in the synthesis of peptides. It has also been observed to convert when placed at the N-terminus in vivo to create IgG2 antibodies.
정의
ChEBI: An optically active form of 5-oxoproline having L-configuration.
Purification Methods
Crystallise S-pyroglutamic acid by dissolving it in boiling EtOH (20g in 100mL), cooling and after a few minutes additing pet ether (b 40-60o, 120mL), then after 5 minutes adding a further 120mL, and coThis has m 155.5-157.5o and [] D -11.4o (c 4.4, H2O) [Hardy Synthesis 290 1978, Pellegata et al. Synthesis 614 1978]. The NH4 salt has m 184-186o (from EtOH). [Beilstein 22/6 V 7.]
