Thermostable Chitinase Producing Bacterium from Ijen Hot Spring - Indonesia: Isolation, Identification, and Characterization

Ruth Chrisnasari*, Liony Priscilla Sutanto, Dian Paulina, Alicia Wahjudi, Tjandra Pantjajani

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

The high industrial demand for thermostable chitinase with new and desirable characteristics has led to the exploration of chitinolytic bacteria from extreme environments. Therefore, this study aimed to isolate, screen, and identify chitinase- producing bacteria from Ijen hot spring, Indonesia. The highest chitinolytic activity bacterium was identified by 16S rRNA gene sequencing and its characteristics were confirmed by morphological and physiological analyses. Chitinase production activity of selected bacterium under variation of agitation and aeration as well as its chitinase properties were characterized afterward. Twelve chitinolytic bacterial colonies were isolated and screened for their growth activity on Thermus colloidal chitin medium, in which chitin was used as the sole carbon source. Among these twelve isolates, isolate B2 showed the highest chitinolytic activity. The molecular, morphological, and physiological analyses confirmed that isolate B2 belonged to Bacillus licheniformis. This isolate produced a huge amount of chitinase on Thermus colloidal chitin medium at 50 C within 30 h. The highest growth and chitinase production activity were recorded at 3 vvm aeration rate and 300 rpm agitation speed. Chitinase produced by this isolate was optimally active at pH of 7 and temperature of 55 C and evidently proofed as thermostable due to its high residual activity after several thermal stability tests.

Original languageEnglish
Title of host publication The 3rd International Conference on Natural Resources and Life Sciences (NRLS) 2020
EditorsR.H. Setyobudi, A. Yaro, I. Zekker, M. Zahoor, T. Turkadze
PublisherEDP Sciences
Volume374
DOIs
Publication statusPublished - 21 Mar 2023
Event3rd International Conference on Natural Resources and Life Sciences, NRLS 2020 - Virtual, Online
Duration: 23 Sept 202024 Sept 2020

Publication series

NameE3S Web of Conferences
PublisherEDP Sciences
ISSN (Print)2555-0403

Conference/symposium

Conference/symposium3rd International Conference on Natural Resources and Life Sciences, NRLS 2020
CityVirtual, Online
Period23/09/2024/09/20

Keywords

  • Bacillus licheniformis
  • Chitinolytic enzyme
  • Chitooligosaccharides (CHOS)
  • Environmentally-friendly technology

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