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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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Correlation on the 3D surface graphs (XYZ) between phenolic compounds concentration and meteorological data. (A) flavonoids concentration in µg/100 mg of propolis extract (X) versus rainfall intensity in mm (Y) and solar radiation (Z). (B) flavonoids concentration µg/100 mg of propolis extract (X) versus rainfall intensity (Y) and relative humidity (Z). (C) Guttiferone E concentration µg/100 mg of propolis extract (X) versus temperature in Kelvin (Y) and solar radiation (Z). (D) Guttiferones E concentration µg/100 mg of propolis extract (X) versus solar radiation in kJ.m² (Y) and rainfall intensity in mm (Z).