Phosphate → Calcitriol

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Nocardia autotrophica N-102 in the same BG medium (100 ml/500 ml-Erlenmeyer flask) as used in Example 1 was cultured at 28° C. under the aerobic conditions for 48 hours. To the culture medium were added 10 ml of a 5% PMCD solution (0.01 M phosphate buffer, pH 7.0) and a solution of 0.1% 1α-hydroxyvitamin D3 in 1 ml of ethanol (in the amount of 140 mol of PMCD relative to 1 mol of 1α-hydroxytvitamin D3). After cultivation for a further 2 hours, methylene chloride was added to the flask, and analysis was carried out according to the method as described in Example 3. The peak fraction having a retention time of 12 minutes was collected, concentrated at 40° C. or below under reduced pressure and applied to HPLC on Zorbax ODS column (4.6 mm×25 cm, made by Du Pont Co., USA) with water-methanol (1:9) as a mobile phase at a flow rate of 1.0 ml/min. After elution, the peak fraction having a retention time of 5.6 minutes was collected and concentrated to dryness at 40° C. or below under reduced pressure with a nitrogen gas replacement to give 650 μg (65% of the conversion ratio from the material) of 1α,25-dihydroxyvitamin D3. On the other hand, following the same procedure as above but without PMCD, the amount of 25-hydroxyvitamin D3 obtained was 350 μg/ml (35% of the conversion ratio from the material).

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