“…The components and the quantities of constituents used in the fermentation medium and cell adsorption conditions varied according to the design of the matrix (He and Tan, 2006).…”
“…The components and the quantities of constituents used in the fermentation medium and cell adsorption conditions varied according to the design of the matrix (He and Tan, 2006).…”
“…Soybean meal as a by-product of the vegetable oil industry could greatly reduce the costs of lipase production. 4,26) The …”
Section: )mentioning
confidence: 99%
“…3) Optimizing the parameters by statistical experimental design, such as Plackett-Burman design and central composite design, can eliminate these limitations of the single-factor optimization process. These methods have been used successfully to optimize and evaluate the effects of process parameters in mesophilic lipase production, [4][5][6][7][8][9][10] but optimization of cold-active lipase production by these methods is very rare.…”
“…Plackett-Burman (P-B) design as a two-level experimental design, requires fewer runs than a comparable fractional design and can be used to identify the more important independent variables from a long list of candidate factors and select them to realize a complete factorial design (He and Tan, 2006). The variables of the culture conditions were coded according to the following equation:…”
Rhodococcus erythropolis was found to effectively degrade aflatoxin B l produced by Aspergillus flavus and Aspergillus parasiticus. However, one problem of concern was the slow growth of this strain. In this study, Plackett-Burman design was used to select the most important variables, namely, temperature, pH, inoculum size, liquid volume, agitation speed and culture time that affected the growth of R. erythropolis. Central composite experimental design and response surface analysis were adopted to derive a statistical model for optimizing the culture conditions. From the obtained results, it can be concluded that the optimum parameters were: temperature, 15.3°C; pH, 5.56; inoculum size, 4%; liquid volume, 70 ml in 250 ml flask; agitation speed, 180 rpm; and culture time, 58.2 h. At this optimum point, the populations of the viable organisms could reach 10 8 colony forming units (CFU)/ml, which was 100 times higher than that incubated under the initial conditions. After 58.2 h incubation in this optimum cultivating conditions, 53.9 ± 2.1% of aflatoxin B 1 was degraded, while only 20.6±1.4% of aflatoxin B 1 was degraded in the initial conditions.
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