Q. frainetto acorns were manually collected from the Akyazı
region of Sakarya, Turkey. Dried methanol (max 0.005% H2O,
reagent grade) and n-hexane (96%, analytical grade) were
received from a local chemical store, Labkim, in Istanbul, Turkey.
Analytical grade potassium hydroxide (KOH) and sulphuric acid
(H2SO4) were obtained from Merck, Germany. An electrical mill;
a small-scale laboratory BUCHI rotary evaporator (Rotavapor R-
210) consisting of 1000 ml round flask, a vacuum pump (V-700);
an AND mark vibro viscometer (SV-10); an AND mark assay
balance; and a NUVE mark NF400-type centrifuge were used in
laboratory studies.