L-Valine is not only one of three branched-chain amino acids but also a member of eight essential amino acids which can’t be synthesized by humans themselves. It plays an important role in many kinds of physiological functions in vertebrates’bodies. The applications of L-valine are very broad: precursor of pharmaceuticals, additives to food or feedstuff for livestocks, material for pesticides, nutrition infusion for patients, health care product, and condiment and so on. Nowadays, scales of the industrial p...