Extraction of selected prohealth substances from Curcuma longa and Zingiber officinale in artificial digestive juices

Abstract

BACKGROUND The study determined the content of selected bioelements, toxic metals and phenolic acids occurring in Curcuma longa L. and Zingiber officinale Rosc. Natural raw materials in the form of powder, slices, dried and fresh rootstock, tablets and capsules were analyzed. To determine the actual bioavailability of the metals and phenolic acids present in the raw materials, they were extracted into artificial digestive juices (artificial gastric and intestinal juices). RESULTS The maximum amounts of bioelements found in turmeric were as follows (mg kg−1 dry weight): Ca, 1911; Cu, 10.4; Fe, 248; K, 123; Mg, 1896; Mn, 181; Na, 332; Zn, 242. On the other hand, the maximum amounts of these bioelements found in ginger were as follows (mg kg−1 dry weight): Ca, 287; Cu, 7.4; Fe, 113; K, 2903; Mg, 1162; Mn, 11.3; Na, 1678; Zn, 186. It was found that bioelements from all the tested samples of raw materials were released to artificial digestive juices. CONCLUSION The amount of substances extracted to digestive juices from the analyzed raw materials varied depending on their form. The highest content of bioelements was found in the fresh rhizomes of turmeric and ginger. On the other hand, powdered rhizome was characterized by the highest bioavailability of elements for humans. © 2021 Society of Chemical Industry

Yerba Mate as a Source of Elements and Bioactive Compounds with Antioxidant Activity

“…The extracts were dissolved quantitatively in HPLC-grade methanol and re-filtered through membrane filters. The prepared methanol extracts were used for determining the content of phenolic acids using RP-HPLC according to an optimized procedure described elsewhere [ 21 ]. The process was performed using an HPLC (Merck-Hitachi, Merck KGaA, Darmstadt, Germany) apparatus equipped with the following: an L-2200 autosampler, an L-2130 pump, a LiChrospher RP-18e column (250 mm × 4 mm, 5 µm) thermostated at 25 °C, an L-2350 column oven, and an L-2455 diode array detector at a UV range of 200–400 nm.…”