In this study Acetobacter pasteurianus strain UMCC 2951 was tested as a microbial starter to conduct acetification processes by repeatedly cultivation cycles under high temperature acetification at 40 ± 1 °C. Acid production and acetification rate increased with repeated cultures under high temperature acetification as adaptation period increased, but were still lower than acetification at 30 ± 1 °C. However, the addition of 0.15 % calcium chloride reduced the negative effects of 40 ± 1 °C on both acid production and acetification rate compared to 30 ± 1 °C. A strong decrease in fatty acids and phosphatidylethanolamine and increases in phosphatidylcholine and phosphatidylglycerol in cell membranes were found under high acid and high temperature acetification. In addition, transmission electron microscope images reveal a more compact cell wall when calcium chloride was added to the cultivation medium. The strategy used in this study confirmed that the use of acetic acid bacteria as microbial starters could be effective also at temperature above the optimal values, when acetification processes are managed through repeated semi-continuous cycles.

Conducting High acetic acid and temperature acetification processes by Acetobacter pasteurianus UMCC 2951 / Pothimon, Ruttipron; Gullo, Maria; La China, Salvatore; Thompson, Anthony Keith; Krusong, Warawut. - In: PROCESS BIOCHEMISTRY. - ISSN 1359-5113. - 98:(2020), pp. 41-50. [10.1016/j.procbio.2020.07.022]

Conducting High acetic acid and temperature acetification processes by Acetobacter pasteurianus UMCC 2951

Gullo, Maria
Membro del Collaboration Group
;
La China, Salvatore
Investigation
;
2020

Abstract

In this study Acetobacter pasteurianus strain UMCC 2951 was tested as a microbial starter to conduct acetification processes by repeatedly cultivation cycles under high temperature acetification at 40 ± 1 °C. Acid production and acetification rate increased with repeated cultures under high temperature acetification as adaptation period increased, but were still lower than acetification at 30 ± 1 °C. However, the addition of 0.15 % calcium chloride reduced the negative effects of 40 ± 1 °C on both acid production and acetification rate compared to 30 ± 1 °C. A strong decrease in fatty acids and phosphatidylethanolamine and increases in phosphatidylcholine and phosphatidylglycerol in cell membranes were found under high acid and high temperature acetification. In addition, transmission electron microscope images reveal a more compact cell wall when calcium chloride was added to the cultivation medium. The strategy used in this study confirmed that the use of acetic acid bacteria as microbial starters could be effective also at temperature above the optimal values, when acetification processes are managed through repeated semi-continuous cycles.
2020
2-ago-2020
98
41
50
Conducting High acetic acid and temperature acetification processes by Acetobacter pasteurianus UMCC 2951 / Pothimon, Ruttipron; Gullo, Maria; La China, Salvatore; Thompson, Anthony Keith; Krusong, Warawut. - In: PROCESS BIOCHEMISTRY. - ISSN 1359-5113. - 98:(2020), pp. 41-50. [10.1016/j.procbio.2020.07.022]
Pothimon, Ruttipron; Gullo, Maria; La China, Salvatore; Thompson, Anthony Keith; Krusong, Warawut
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1207993
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