Figure 5.

The polar analysis of extracellular yellow monascus pigments produced by the mutant strain M. purpureus H14 (A); spectral scan results (B) and the value (C) of extracellular yellow monascus pigments in a pH range of 1–14; the value stability of extracellular yellow monascus pigments produced by the mutant strain M. purpureus H14 subject to heat (D), light (E), metal ions (F); the tone of extracellular yellow monascus pigments in response to various metal ions with different concentrations (G).