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Improvements of Acetic Acid Bacterial Strains: Thermotolerant Properties of Acetic Acid Bacteria and Genetic Modification for Strain Development
| Content Provider | Scilit |
|---|---|
| Author | Saichana, Natsaran |
| Copyright Year | 2017 |
| Description | Book Name: Acetic Acid Bacteria |
| Abstract | Acetic acid bacteria (AAB) are natural oxidizers for ethanol, sugars, sugar alcohols and sugar acids (Matsushita et al. 1994, Adachi et al. 2007). They rapidly oxidize the substrates, accumulating the oxidized products in the culture media. This property is preferable for industrial dowstream processing as the products can be separated easily from the bacterial cells. This characteristic is suitable for biotransformation of various kinds of substrates. However, in order to apply some valuable AAB into industries, the selected strains need to be improved to meet the requirements of industrial criteria. Thermotolerant ability of some AAB is considered as a preferable property for industrial application as thermotolerant strains are more resistant to environmental changes during the course of fermentation. AAB are mesophilic bacteria with the optimum temperature for normal growth ranging around 30°C and the growth will be dramatically affected by increasing the growth temperature from the optimal temperature. The thermotolerant AAB strains, however, show normal growth at around 30°C and continue to grow very well at higher temperature (37°C or above). Application of mesophilic AAB in industrial production of vinegar and other products needs strict temperature control at 30°C during the fermentation period as heat generated from the biological activity increases the temperature in the fermentation vessel and, therefore, a cooling system is required to maintain the optimum temperature. The growth and production of mesophillic AAB will be significantly affected by the failure in temperature control and there is usually neither growth nor production at temperatures over 34°C (Saichana et al. 2015). The discovery of thermotolerant AAB has induced the possibility of reducing the cost for cooling system and allows flexible operation during fermentation. Most thermotolerant AAB can grow and perform oxidative fermentation at 37°C and some strains can even grow at temperatures going up to 42°C (Soemphol et al. 2011). Genome-wide analysis of closely related Acetobacter pasteurianus strains revealed that the thermotolerant strains are closer to each other than to thermotolersensitive ones (Matsutani et al. 2012). AAB with thermotolerant ability are more suitable for industrial 143applications and have been already applied in industrial scales. Thermotolerant AAB are considered as improved strains for industrial applications, but most thermotolerant strains still require further improvements to be more suitable for industrial uses. This calls for improvement in genetic level to create suitable strains for industrial applications. |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2015-0-76655-9&isbn=9781315153490&doi=10.1201/9781315153490-7&format=pdf |
| Ending Page | 161 |
| Page Count | 20 |
| Starting Page | 142 |
| DOI | 10.1201/9781315153490-7 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2017-06-28 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Acetic Acid Bacteria Metallurgy and Metallurgical Engineering Strains Thermotolerant Ability Aab Are Considered Optimal Fermentation Industrial Temperature |
| Content Type | Text |
| Resource Type | Chapter |
