Effect of amino acids on production of xylanase and pectinase from Streptomyces sp QG-11-3

Xylanase and pectinase production by Streptomyces sp. QG-11-3 was stimulate d by DL-norleucine, L-leucine, DL-isoleucine, L-lysine monohydrochloride an d DL-beta-phenylalanine by up to 3.72- and 2.78-fold, respectively, whereas the combination of DL-norleucine, L-leucine and DL-isoleucine synergistica lly stimulated the xylanase and pectinase production by up to 6.72- and 5.6 2-fold, respectively. Glycine, DL-norvaline, DL-methionine, and DL-aspartic acid showed no significant stimulatory effect on enzyme production.