Antifungal activity of secondary plant metabolites from potatoes (Solanum tuberosum L.): Glycoalkaloids and phenolic acids show synergistic effects

• Author(s) / Creator(s)

  • Sánchez-Maldonado, A.
  • Schieber, A.
  • Gänzle, Michael G.

• Aims To study the antifungal effects of the potato secondary metabolites α-solanine, α-chaconine, solanidine and caffeic acid, alone or combined. Methods and Results Resistance to glycoalkaloids varied among the fungal species tested, as derived from minimum inhibitory concentrations assays. Synergistic antifungal activity between glycoalkaloids and phenolic compounds was found. Changes in the fluidity of fungal membranes caused by potato secondary plant metabolites were determined by calculation of the generalized polarization values. The results partially explained the synergistic effect between caffeic acid and α-chaconine and supported findings on membrane disruption mechanisms from previous studies on artificial membranes. LC/MS analysis was used to determine variability and relative amounts of sterols in the different fungal species. Results suggested that the sterol pattern of fungi is related to their resistance to potato glycoalkaloids and to their taxonomy. Conclusion Fungal resistance to α-chaconine and possibly other glycoalkaloids is species dependent. α-Chaconine and caffeic acid show synergistic antifungal activity. The taxonomic classification and the sterol pattern play a role in fungal resistance to glycoalkaloids. Significance and Impact of the Study Results improve the understanding of the antifungal mode of action of potato secondary metabolites, which is essential for their potential utilization as antifungal agents in nonfood systems.

• Date created

  2016-01-01

• Subjects / Keywords

  • Phenolic Acids
  • Membrane Disruption
  • Antifungal Synergism
  • LC/MS
  • Glycoalkaloids
  • Potato Secondary Metabolites

• Type of Item

  Article (Draft / Submitted)

• DOI

  https://doi.org/10.7939/r3-hr3z-wx87

• License

  © 2016 The Society for Applied Microbiology. This is the peer reviewed version of the following article: "Sánchez-Maldonado, A., Schieber, A., & Gänzle, M. G. (2016). Antifungal activity of secondary plant metabolites from potatoes (Solanum tuberosum L.): Glycoalkaloids and phenolic acids show synergistic effects. Journal of Applied Microbiology, 120(4), 955-965.", which has been published in final form at http://doi.org/10.1111/jam.13056. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.