L-histidine is an alkalescency amino acid with an imidazole group. It's a semi-essentialamino acid in human and animal, but it is an indispensable to infants. It has extensiveapplications in medicament. In our country, L-histidine is mainly produced by hydrolyze pigblood powder, and applications in forage. But in medicament, L-histidine has to depend onimporting.
In developed countries, L-histidine is produced with fermentation. In 1970s', L-histidinefermentation was researched in Japan. Now there...