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Bioresources and Bioprocessing
Fig. 3 | Bioresources and Bioprocessing

Fig. 3

From: Production of the antifungal biopesticide physcion through the combination of microbial fermentation and chemical post-treatment

Fig. 3

Tetrahydroanthracenes 3 and 4 were converted to anthraquinones 2 and 1 by alkali treatment at different concentrations. A Scheme of conversion. B HPLC analysis of the alkali treatment products of 3: a commercial emodin standard; b–e 3 treated with 0%, 0.1%, 1%, and 5% NaOH aqueous solution, with the pH value adjusted to 4–5 before extraction; f 3 treated with 5% NaOH aqueous solution without pH adjustment. C HPLC analysis of the alkali treatment products of 4: a commercial physcion standard; b–e 4 treated with 0%, 0.1%, 1%, and 5% NaOH aqueous solution, with the pH value adjusted to 4–5 before extraction; f 4 treated with 5% NaOH aqueous solution without pH adjustment

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