Isolation and Characterization of Thermophilic Bacteria as Cellulolytic Enzyme Producer from the Hot Spring of Ie Seuum Aceh Besar, Indonesia

Cellulase enzymes can be isolated from thermophilic bacteria obtained from the hot spring Ie Seuum, Aceh Besar. This research aimed to recover and characterize the isolates morphologically and biochemically followed by determination of the thermophile bacterial isolates potential as cellulolytic enzyme producers, The sampling o o o method in this research was conducted by a purposive sampling at temperature of 70 C, 60 C, and 50 C. Isolation of thermophilic bacteria was carried out on nutrient agar (NA) media. There were four isolates of thermophilic o o o bacteria isolated recovered at 70 C, five isolates at 60 C, and seven isolates at 50 C. Of the 18 isolates obtained, 15 of them were able to produce cellulase enzymes. Cellulase enzyme production can be determined by the presence of clear zones around bacterial colonies on CMC media after addition of 1% congo red drops and wash with 1 M NaCl. The highest five Cellulolytic Index (CI) values w​​ ere obtained from isolates ISB75; ISB64; ISB52; ISB54; and ISB56 that were 1.23; 2.22; 1.39; 1.59; and 1.10, respectively. Biochemical tests carried out on 5 isolates with the highest cellulolytic index values showed that the bacterial isolate were suspected to be from the genera of Bacillus sp.