, Volume 4, Issue 4, pp 221-226

Recovery of poly-3-hydroxyalkanoic acid granules by a surfactant-hypochlorite treatment

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When Alcaligenes eutrophus biomass was treated with a surfactant and then washed with hypochlorite, the recovered poly-3-hydroxyalkanoic acid (PHA) granules were 97 to 98% pure with a molecular weight (MW) between 730,000 and 790,000, depending on the surfactant used. When treated with only surfactant, the MW was slightly higher than that obtained with the surfactant-hypochlorite treatment but the purity was 10% lower. PHA of higher purity but lower MW was obtained with just a hypochlorite treatment.