Abstract
AbstractThe metabolic pathway of degradation of naphthalene to salicylic acid has been studied by several investigators. The rates of conversion and of cell growth are the basis for the present study. In the early phase of the fermentation, the salicylic acid accumulation followed an exponential curve, as did the bacterial cell accumulation. In the second phase, most of the salicylic acid was produced according to a linear or zero reaction, at rates of 0.3 to 0.5 g./l./hr. A linear accumulation of microbial cell weight accompanied the linear salicylic acid formation. Despite the correlation of growth and salicylic acid production, the type or amount of nitrogen supplied for growth had only a small effect on yield over broad limits. The optimum pH for salicylic acid accumulation was approximately 6.5. Below this value a slower rate of production and lower final yield was seen. Above pH 6.5, a rapid degradation of salicylic acid was observed. A temperature range from 25 to 30°C. was optimum. At 35°C., no growth occurred, while at 20°C. very slow salicylic acid accumulation resulted.
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