Simplicity ultrapure water system

The plum distillates were diluted with deionized water (Simplicity^® Ultrapure Water System, 18.2 MΩ∙cm resistivity (25 °C) at 0.5 L/min, Merck Millipore) from initial ASVs of 76.77% v/v and 81.92% v/v to 37.5, 40 and 50% v/v. Next, the samples were placed in glass bottles and stored under the following conditions, for 64 days:

ambient temperature (+ 20 ± 2 °C), daylight,

ambient temperature (+ 20 ± 2 °C), darkness,

cold storage (+ 8 °C), darkness,

temperature close to freezing (− 16 °C for ASVs of 37.5% v/v and 40% v/v, − 25 °C for ASV of 50% v/v), darkness.

After 10, 20, 30, 34, 42, 50, 57 and 64 days the turbidity of the samples was measured. After 64 days, the samples were filtered through filter sheets and then subjected to turbidity measurements, as well as to chromatographic and organoleptic analysis. The control samples were the distillates before treatment. Prior to filtration, the used filter sheets were rinsed with deionized water for 10 min in the direction of flow.

The raw materials used were distillates produced on an industrial scale by the Polish companies. Rye distillate (ABV of 93.26% v/v) was sourced from the agricultural distillery Zbig-Rol (Prusinowice, Poland). Plum distillate (ABV of 82.03% v/v) was provided by the company +H₂O (Chociszew, Poland). Deionized water was produced using the Simplicity^® Ultrapure Water System, 18.2 MΏ·cm resistivity (25 °C) at 0.5 L/min, Merck Millipore (Burlington, MA, USA).