Purification and characterization of pyridoxal-5‘-phosphate hydrolase from tobacco Separation and Purification as well as Properties of Phenylalanine Ammonia-lyase in Lily Bulbs Separation and Purification as well as Properties of Phenylalanine Ammonia-lyase in Lily Bulbs Purification and enzymatic characterization of phospholipase A2 from latex of Hevea brasiliensis