Ferroverdin extraction with ethyl acetate, drying, and resuspension in acetonitrile were performed as described previously [19 (link)]. Samples were analyzed by HPLC and Ferroverdin A was detected at 440 nm and quantified by peak area integration, as described previously [19 (link)]. Data were analyzed using Empower 3 (Waters, Milford, MA, USA). The HPLC-based protocol for ferroverdin A semi-quantitative analysis is detailed in Appendix A.
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