Variations of amino acid composition and of the contents of caffeine,theobromine and theophylline during the primary processing of dark greentea were analysed with amino acids analyser and HPLC.Results showedthat the total content of amino acids decreased,of which the contents oftheanine and glutamic acid decreased sharply.But the contents of the acidswhich are indispensable to human such as lusine,phenylalanine,leucine,isoleucine,methionine and valine increased significantly.The caffeinecontent decreased a...