List of Articles Thermophilic

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  1 - A survey on bacterial contamination of fruit juice with Alicyclobacillus acidoterrestris using PCR and RFLP
  Hossein Motamedi Amir TajBakhsh
  Abstract Alicyclobacillus is an endospore forming and heat resistant bacterium that can cause changes in odor and color of fruit juice and make significant losses to juice industries. The purpose of this study was to identify this bacterium from different juic More

  Abstract Alicyclobacillus is an endospore forming and heat resistant bacterium that can cause changes in odor and color of fruit juice and make significant losses to juice industries. The purpose of this study was to identify this bacterium from different juices by PCR using specific primers. To do so, DNA extraction and PCR was done after culture and incubation. Of 24 tested samples, 5 cases were examined. As a consequence of enzymatic digestion with EcoR1 and electrophoresis, 118 and 528 bp fragments were obtained that are in accordance with RFLP pattern of Alicyclobacillus acidoterrestris. With regard to the obtained results, it can be claimed that contamination to this bacterium makes some problems in fruit juice industry. To diagnosis it better, PCR with high sensitivity can be used since it reduce the expenditures and save the time. Manuscript profile
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  2 - Production and characterization of a thermophilic and extremely halotolerant alpha-amylase isolated from Anoxybacillus gonensis AT23
  Saeedeh Afrisham Arasto Badoei Delfard Abdolhamid Namaki Shoshtari Zahra Karami
  Background & Objectives: Thermophilic alpha-amylase can be used in different industries such as starch processing and detergents. This study was performed to isolate alpha-amylase-producing bacteria and characterization of the enzyme. Materials & Methods: After More

  Background & Objectives: Thermophilic alpha-amylase can be used in different industries such as starch processing and detergents. This study was performed to isolate alpha-amylase-producing bacteria and characterization of the enzyme. Materials & Methods: After sample collection from Gorooh hot spring in Kerman province, Iran, thermophilic alpha-amylase- producing bacteria were isolated using the starch-agar medium. 16S rDNA sequencing was used to identify the bacterial strain. Characterization of the thermophilic alpha-amylase was performed in the presence of various factors such as pH, temperature, metal ions, chemical compounds, and organic solvents. Also, kinetic parameters of the enzyme were determined in different concentrations of starch. Results: Anoxybacillus gonensis AT23 was identified as the best thermophilic alpha-amylase- producing strain. The alpha-amylase enzyme showed the optimal activity at pH 5 to 6. Sevenfold increase in the enzyme activity was observed in the presence of NaCl (3M). Mn2+ and Zn2+ increased the enzyme activity about 95% and 31%, respectively. Kinetic parameters including Km and Vmax were estimated about 1.657 mg/ml and 0.0059 mg/ml/min, respectively. Also, enzyme activity was also improved about 2 folds in the presence of organic solvents including n-butanol and 10% cyclohexane. Conclusion: Our results indicated that AT23 alpha-amylase is a halophile and organic solvent-tolerant enzyme. Therefore, it can be used in different industries. Manuscript profile