2 Materials and methods
2.1 Microorganism and culture media
P. purpurogenum GH2 from the DIA-UAdeC
collection was used in this study. The strain was
conserved in a spore solution at −20 °C, and was
inoculated into a 250-ml Erlenmeyer flask containing 30 ml of malt extract agar prepared using deionized
water (Milli-Q) and incubated at 30 °C for 5–7 d.