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. 2019 Dec 4;9:18293. doi: 10.1038/s41598-019-54591-3

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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PLS-DA analysis from the interaction between all components (Component 1, all months of the seasonal study as primary variable), (Components 2 to 5, phenolic compounds concentrations and Components 6 to 12, antibacterial activity concentrations tested as independent variables) were analysed using S. aureus (A,B) and P. aeruginosa (C,D). (A) Paired PLS-DA Hotelling´s T2 test compares propolis A (green) with propolis B (blue) at significant levels 95% (T2: 7.19) and 99%(T2: 11.95) as upper critical limits (UCL) in the antibacterial test against Staphylococcus aureus resulting in outliers in propolis A (July sample). The PLS-DA model was validated by CV-ANOVA, p = 0.0005, F = 8.16. (B) Paired PLS-DA Hotelling´s T2 test compares propolis B (blue) with propolis C (red) at significant levels 95% (T2: 7.19) and 99% (T2: 11.95) as upper critical limits (UCL) in the antibacterial test against Staphylococcus aureus resulting in outliers in propolis C (June sample). The PLS-DA model was validated by CV-ANOVA, p = 0.0199, F = 3.78. (C) Paired PLS-DA Hotelling´s T2 test compares propolis A (green) with propolis B (blue) at significant levels 95% (T2: 7.19) and 99% (T2: 11.95) as upper critical limits (UCL) in the antibacterial test against Pseudomonas aeruginosa resulting in outliers in propolis A (July sample). The PLS-DA model was validated by CV-ANOVA, p = 0.0002, F = 9.20. (D) Paired PLS-DA Hotelling´s T2 test compares propolis B (blue) with propolis C (red) at significant levels 95% (T2: 7.19) and 99% (T2: 11.95) as upper critical limits (UCL) in the antibacterial test against Pseudomonas aeruginosa resulting in outliers in propolis C (April sample). The PLS-DA model was validated by CV-ANOVA, p = 0.0104, F = 4.44.