3.1. Materials

Dried Elsholtzia ciliata herb was purchased from “Zolynu namai” (Vilnius, Lithuania). A voucher specimen (L 17710) has been deposited at the Herbarium of the Department of Drug Technology and Social Pharmacy, Lithuanian University of Health Sciences.

HPLC eluents: formic acid, phosphoric acid, and acetonitrile were purchased from Sigma-Aldrich, (Steinheim, Germany), methanol from Carl Roth GmbH, (Karlsruhe, Germany). Standards for HPLC analysis: chlorogenic acid, rosmarinic acid, apigenin, and eugenol were purchased from Extrasynthese, (Genay, France). Wall material compounds: sodium caseinate, skim milk, maltodextrin, gum arabic, beta-cyclodextrin were purchased from Sigma-Aldrich, (Steinheim, Germany), resistant-maltodextrin (Promitor 85 ™) was purchased from Bang & Bonsomer, (Vilnius, Lithuania). Folin-Ciocalteu reagent, gallic acid monohydrate, and sodium carbonate were purchased from Sigma-Aldrich GmbH (Buchs, Switzerland). Extraction solvent ethanol (96%) was purchased from Vilniaus degtine, (Vilnius, Lithuania). Water used in HPLC and for the sample preparation was produced with a Millipore Super Purity Water System, (Sigma-Aldrich Corp., St. Louis, MO, USA).