HPLC grade solvents were supplied by Honeywell (Germany), while analytical grade solvents were supplied by PanReac (Germany). The evaporation procedures were performed under reduced pressure using a Heidolph
Laborota 4000 instrument (Heidolph Instruments GmbH & Co., Schwabach, Germany).
Analytical thin-layer chromatography (TLC) was carried out on silica gel pre-coated glass-backed plates (
Fluka Kieselgel 60 F254, Merck, Darmstadt, Germany). The detection was conducted with UV light or ceric ammonium molybdate (IV) stain (Hanessian’s Stain).
Flash chromatography was performed with silica gel 60 (particle size 230–400 mesh) purchased from Nova Chimica (Cinisello Balsamo, Italy).
Fetal bovine serum (FBS; Gibco) was purchased from ThermoFisher Scientific (Lisbon, Portugal).
H. sabdariffa calyces were powdered using a blade mill (A10 IKA-Werke GmbH & Co., Staufen, Germany) and then extracted exploiting a multimode microwave apparatus (
MARSX press, CEM Corporation, Matthews, NC, USA).
Malacrida A., Cavalloro V., Martino E., Costa G., Ambrosio F.A., Alcaro S., Rigolio R., Cassetti A., Miloso M, & Collina S. (2021). Anti-Multiple Myeloma Potential of Secondary Metabolites from Hibiscus sabdariffa—Part 2. Molecules, 26(21), 6596.