Essential amino acid for human development. Lysine residues are useful in many cellular processes, due to their ability to accept a wide variety of post-translational modifications.Optical Rotation: [a]D20 = +24.0 to +27.0ºLoss on Drying:≤5.0%Heavy Metals(Pb):≤0.001%Residue On Ignition:≤0.5%Chloride (Cl-):≤0.03%Ammonium(NH4):≤0.02%Iron (Fe):≤0.001%Arsenic (As):≤0.0001%Storage and Stability:Store at 4ºC. Stable for 6 months after receipt.