Further characterization of pigment-producing Malassezia strains.

摘要: Summary Reference as well field strains of Malassezia furfur (30), M. sympodialis (49), globosa (52), obtusa (one), restricta slooffiae (seven), and pachydermatis (373) were investigated for their ability to produce pigment fluorochromes when tryptophan (Trp) is offered the main nitrogen source. Only produced on a pigment-inducing medium (p-medium). Remarkably, optical activity Trp was not significant synthesis. Other sources that are structurally similar (gramine, tryptamine, serotonin) did induce formation. All lipophilic non-furfur species failed grow form this agar. However, growth all lipid-dependent achieved modified Dixon agar in which peptone had been substituted by an equal amount l-Trp. Here, too, colonies characterized rapidly developing dark brown halos. Furthermore, about 11% tested formation p-medium, enhanced addition d-glucose. In contrast furfur, occurred after markedly longer incubation time (4 weeks unlike 3–5 days) with lower yield limited color spectrum (thin layer chromatography, TLC). The UV filter pityriacitrine recently described also demonstrated extraction, high-performance liquid chromatography (HPLC) analysis co-elution mass spectroscopy. phenotypic feature some may confirm recent molecular-genetic findings suggesting relationship between furfur.