Production and Characterisation of Thermostable Protease from Bacillus Stearothermophilus Strain F1

Raja Abd. Rahman, Raja Noor Zaliha (1994) Production and Characterisation of Thermostable Protease from Bacillus Stearothermophilus Strain F1. Masters thesis, Universiti Pertanian Malaysia.

[img] PDF
1750Kb

Abstract

Screening and isolation of thermophilic proteolytic bacteria were carried out from composting areas, high temperature ponding systems and areas surrounding palm oil mills. Twelve isolates were positive on Skim Milk A gar (10%) of which 11 produced protease in culture broth. A thermophilic and highly proteolytic isolate identifi edas Bacillus stearothermophilus strain F1 isolated from decomposed oil palm branch, was selected for further study. B. stearothermophilus strain F1 could grow up to 80°C within a broad pH ranges (pH 5 to 11) with an optimal growth temperature and pH at 70°C and 9.5, respectively. The doubling time of this bacteria at 60°C was 70 min. Maximum protease production was achieved after 24 h cultivation when grown in 50 ml medium (pH 10.0) under shaking condition at 60°C. Static condition inhibited protease production but not growth. Cultures grown on peptone (iv) generated the highest amount of protease and lower production was observed when glucose or other rapidly metabolized carbon sources were added. Ammonium salt (0.5%) and amino acids (0.5%) interfered with protease formation whenever they were added to the medium. Although the protease production was calcium independ ent, the presence of the ion at 4.5 mM enhanced the yield by two-fold. Protease production occurred during the midexponential growth phase of the bacterial growth and its onset coincided with sporulation.

Item Type:Thesis (Masters)
Subject:Thermophilic bacteria
Subject:Proteolytic enzymes
Chairman Supervisor:Associate Professor Che Nyonya Abdul Razak, PhD
Call Number:FSAS 1994 7
Faculty or Institute:Faculty of Environmental Studies
ID Code:8589
Deposited By: Nurul Hayatie Hashim
Deposited On:02 Dec 2010 10:16
Last Modified:07 May 2012 08:26

Repository Staff Only: item control page

Document Download Statistics

This item has been downloaded for since 02 Dec 2010 10:16.

View statistics for "Production and Characterisation of Thermostable Protease from Bacillus Stearothermophilus Strain F1"


Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.