%0 Journal Article %A Crowley, Nuala %T The Action of Streptococcal Amylase in relation to the Synthesis of an Amylosaccharide by Amylolytic Strains of Streptococcus pyogenes %D 1955 %J Microbiology, %V 13 %N 2 %P 218-225 %@ 1465-2080 %R https://doi.org/10.1099/00221287-13-2-218 %I Microbiology Society, %X Summary: Streptococcal amylase behaves like α-amylase, causing branch-chained substrates to lose viscosity with minimal release of reducing groups, and to become achromic with iodine. Reducing values equivalent to 50 % of the theoretically obtainable maltose were reached after prolonged hydrolysis. The enzyme was produced in high concentration by amylase-positive streptococci growing in simplified medium containing substrate. The same strains synthesized a starchy cell substance if grown in plasma-enriched medium containing either maltose or glycogen. When extracted by boiling with weak alkali the new product resembled amylose. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-13-2-218