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A highly efficient, rapid, green and safe procedure for the preparation of free all‐trans‐astaxanthin from Haematococcus pluvialis algal extract, by a crude extracellular enzyme extract, was reported. The free all‐trans‐astaxanthin obtained by the biocatalysed method had fewer side products compared to the saponification procedure. Through single‐factor experiments and a Box–Behnken design, it was...
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