Chiang Mai Journal of Science

Ten probiotic Streptomyces strains isolated from soils and fish intestines were cultured in starchy wastewater collected from the potato chip factory in northern Thailand. Among these, 8 isolates were able to grow in starchy wastewater as sole source of nutrient and yielded equivalent growth as those cultivated in synthetic medium; Yeast extract protein starch soluble (YpSs) under the same condition (150 rpm at 30^OC for 7 days). Two Streptomyces, F7-6 and F8-6 were chosen for time course experiment in starchy wastewater. The highest growth was observed on day 4 of cultivation with biomass yield and also showed amylase activity of 3.855±0.32 mg/ml dried cell weight (3.191±0.07 U/ml) and 2.766±0.63 mg/ml dried cell weight (2.492±0.16 U/ml), respectively.