L-aspartic acid is an organic compound with chemical formula C4H7NO4. White crystalline or crystalline powder, slightly acidic taste. Soluble in boiling water, 25℃ slightly soluble in water (0.5%), easily soluble in dilute acid and sodium hydroxide solution, insoluble in ethanol, ether, heated to 270℃ decomposition, isoelectric point 2.77, the specific rotation and the solvent is related.