Zhou B Y, Zheng Y X
Shanghai Institute of Plant Physiology, Chinese Academy of Sciences.
Chin J Biotechnol. 1991;7(2):145-52.
A thermostable beta-amylase from Thermoactinomyces sp. V4 isolated from soil is reported. The enzyme has optimum activity at 70 degrees C and pH6. It is stable at 50 degrees C (4h) and retains 92% of activity at 55 degrees C (2h). The extent of hydrolysis soluble starch is about 77% and the product is identified as beta-maltose by paper chromatography and rotatory examination. Sulfhydryl reagent has no effect on the beta-amylase activity.
