*2.1. Material*

The study was conducted on 30 samples of honey produced in 2019 from nectar and honeydew sources located in the Lublin region (southeastern Poland). The material comprised 10 samples of multifloral honey (MF), 6 samples of linden honey (LI), 5 samples of rapeseed honey (RS), 5 samples of buckwheat honey (BW), and 4 samples of honeydew honey (HD). Honey samples represented the locally produced honey from apiaries located in 8 districts from different parts of the Lubelskie voivodship: northern (Bialski district (BW *n* = 2, LI *n* = 1, RS *n* = 1, MF *n* = 1)), southern (Zamojski (MF *n* = 2, HD *n* = 1) and Biłgoraj (HD *n* = 1, LI *n* = 1, BW *n* = 2) districts), eastern (Włodawa (MF *n* = 2, LI *n* = 2, HD *n* = 1) and Chełmski (MF *n* = 2, RS *n* = 1) districts), western (Puławy (LI *n* = 2, HD *n* = 1) and Opole (MF *n* = 2, RS *n* = 1, BW *n* = 1) districts), and central (Lubelski district RS *n* = 2, MF *n* = 1). The apiaries were located in agricultural farmlands without concentrations of industry. The honey was purchased directly from beekeepers just after harvesting (from May to August) and stored in glass jars at 20 ◦C (±2 ◦C) out of direct sunlight.
