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To clarify the dynamic behavior of the anaerobic acid reactor in response to pH changes, a continuous cultivation was performed. By stepwise shifting the culture pH in the acid reactor from 6.0 to 8.0, the main products were changed from butyric acid to acetic and propionic acids. This phenomenon was reproducible, reversible and was not affected by the dilution rate. It was considered that the dominant...
As astaxanthin could not be extracted with various organic solvents from intact thick-walled cyst cells of Haematococcus pluvialis, cells were held in 40% (v/v) acetone for 2 min at 80°C, followed by lyophilization or treatment of cells with specific lytic enzymes. By these treatments, 70% of the astaxanthin was extracted from the cells. Furthermore, the heat-acetone treatment was useful to remove...
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