| 摘要 |
The present invention provides a method for producing highly purified polyhydroxyalkanoate (PHA) with high yield, by removing cell components other than PHA from cells containing PHA. Moreover, the present invention provides a method for simply removing or reducing chlorine remained in the collected PHA particles, when a treatment with an oxidizing agent containing hypochlorite is performed in the production of PHA as described above. One of the above-described methods comprises a step of treating cells containing polyhydroxyalkanoate with an oxidizing agent containing at least hypochlorite, a step of separating the treated cells into a water-soluble fraction and a water-insoluble fraction, and a step of reducing chlorine remained in the water-insoluble fraction. The step of reducing chlorine may be a step of washing the water-insoluble fraction with a hot water, thiosulfate solution or polar solvent solution containing at least an organic polar solvent in which polyhydroxyalkanoate is insoluble.
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