A method for the separation of L-pipecolic acid (2-piperidinecarboxylic acid) was examined and by a simple method employing its separation and purification as a picrate from the neutral amino acid fraction this acid was isolated and identified ascrystals of ginger. Asparagine was also isolated and identified as crystals. Two-dimensional paper chromatography of the amino acid fraction proved the presence of glutamic acid, aspartic acid, serine, glycine, threonine, alanine, glutamine, arginine, γ-aminobutyric acid, valine, and phenylalanine.
