Correlation of antioxidant activity of dried berry infusions with the polyphenols and selected microelements contents

Abstract

ABSTRACT. Antioxidant activity was measured by ferric reducing ability of plasma (FRAP) assay in seven types of infusions prepared from commercial dried berry fruit products: Rosa canina, Vaccinium vitis-idaea, Hiphophae rhamnoides, Hibiscus sabdariffa and three fruit mixtures. Total polyphenols (TP), total anthocyanins and the polyphenolic compounds were determined by HPLC equipped with diode array detector. To estimate the amount of elements released from fruits into the water extracts, levels of Fe, Mn, Zn and Cu in dried samples and in infusions were determined by flame atomic absorption spectrometry. The correlation between polyphenols content and the antioxidant activities and the microelements in the infusions and the antioxidant activities were estimated using the Pearson's correlation test. The results showed a high, positive and significant correlation (r = 0.9465) between the FRAP values and TP content, meaning that the concentration of phenolic compounds may be a good indicator of the reducing capacity in the infusions. Correlations varied (positive, negative and weak) between antioxidant and mineral extractability of berry infusions. Among the polyphenolic compounds, gallic acid contributed particularly to the antioxidant capacity of the studied samples (r = 0.563). The correlation of antioxidants, total polyphenols with mineral extractability showed the influence of antioxidant compound on mineral bioavailability.

Health-Promoting Capacities of In Vitro and Cultivated Goji (Lycium chinense Mill.) Fruit and Leaves; Polyphenols, Antimicrobial Activity, Macro- and Microelements and Heavy Metals

“…Generally, positive correlations were observed between FRAP and Fe, Cu, and Sn content in our research. These results demonstrate that FRAP in fruits has a significant impact on enhancing the extractability of Cu bound with the ability to form chelated metal ions by FRAP and to retain them (37). Antioxidants that react in the FRAP assay are those that can reduce, under the reaction conditions used, the Fe 3+ -TPTZ salt to Fe2+-TPTZ form.…”

“…The first group included polyphenols, which showed high dependence with antioxidant activity, and inhibitors activities. It is known that the antioxidant activity of fruits is influenced by their phenolic composition [ 37 ]. There was a positive correlation between the DPPH values and polyphenolic compounds content, meaning that the concentration of phenolic compounds may be a good indicator of the reducing capacity in the fruits.…”

One-pot green synthesis of gold and silver nanoparticles using Rosa canina L. extract

“…Phytochemical results showed the presence of proanthocyanidins, avonoids, 25 ellagic acid, catechin, gallic acid and caffeic acid as major compounds. 44,45 Ascorbic acid and the phenolic compounds could be participating in the silver and gold nanoparticles formation. It is impossible to describe an exact reaction, but generally, it can be said that hydroxy functional groups containing compounds can reduce metallic cations while forming to ketone groups as R. Kumar published earlier.…”

Mushroom Species Stereum hirsutum as Natural Source of Phenolics and Fatty Acids as Antioxidants and Acetylcholinesterase Inhibitors

“…Moreover, previous study with berries demonstrated moderate positive correlations between AO and Cu (r 2 = 0.439), Zn (r 2 = 0.375) and Mn (r 2 = 0.352), while weak correlation with Fe (r 2 = 0.186) was observed. [42] The prevailing point of view is that concentration of metals in mushrooms is variable since it depends mostly on environmental factors of habitat [43] and must be considered in preparation of food supplements from mushrooms collected in the wild.…”