Abstract

To increase the level of production in mass culture, the effects of pH and light irradiation on production by Rhodobacter sphaeroides were investigated in a 1-L bioreactor. production was growth-associated, and the highest production of (1.69 mg/g dry cell) was obtained under uncontrolled pH: this production was 1.7 times higher than that obtained at controlled pH 7. Therefore, pH was a key factor affecting production. The effect of light irradiation on production was negligible. This result offers an advantage for mass production of .

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