The Study of Interactions between Active Compounds of Coffee and Willow (Salixsp.) Bark Water Extract

Abstract

Coffee and willow are known as valuable sources of biologically active phytochemicals such as chlorogenic acid, caffeine, and salicin. The aim of the study was to determine the interactions between the active compounds contained in water extracts from coffee and bark of willow (Salix purpurea and Salix myrsinifolia). Raw materials and their mixtures were characterized by multidirectional antioxidant activities; however, bioactive constituents interacted with each other. Synergism was observed for ability of inhibition of lipid peroxidation and reducing power, whereas compounds able to scavenge ABTS radical cation acted antagonistically. Additionally, phytochemicals from willow bark possessed hydrophilic character and thermostability which justifies their potential use as an ingredient in coffee beverages. Proposed mixtures may be used in the prophylaxis or treatment of some civilization diseases linked with oxidative stress. Most importantly, strong synergism observed for phytochemicals able to prevent lipids against oxidation may suggest protective effect for cell membrane phospholipids. Obtained results indicate that extracts from bark tested Salix genotypes as an ingredient in coffee beverages can provide health promoting benefits to the consumers; however, this issue requires further study.

Characterization of bioactive compounds in the biomass of black locust, poplar and willow

“…The TAC values were 172.9, 625.2 and 902.2 mmol TE/mL extract, respectively for sheath, seed and leaf extracts. The same method for the TAC determination of methanol-water extracts from the black locust and poplar leaves was used by Tálos-Nebehaj et al (2017) as well as of water extracts from willow bark by Durak et al (2015) and Durak and Gawlik-Dziki (2014). The results of ABTS test of poplar buds and willow bark were also expressed as the IC 50 value (Zaiter et al 2016;Zhang et al 2015b).…”

“…In other studies, Trolox as the FRAP standard (Todaro et al 2017) and ascorbic acid (Tálos-Nebehaj et al 2017) were used as well as TAC was expressed in the effective concentration values (EC 50 ) as in the case of DPPH (IC 50 ) (Durak and Gawlik-Dziki 2014). Todaro et al (2017) assessed different temperatures of thermo-vacuum treatment (180, 200, 220 °C) and also extraction techniques of poplar wood (maceration, ultrasound-assisted extraction-UAE, and accelerated-solvent extraction-ASE).…”

“…A variation of FRAP assay is reducing power assay (FRAP-RP assay), based on the ability of plant polyphenols to reduce Fe(III) to Fe(II), which was used to determine TAC of ethanolic extracts of poplar buds and poplar-type propolis (Zhang et al 2015b) as well as water extracts of willow bark (Durak and Gawlik-Dziki 2014). Poplar buds extracts had an oxidant activity of 1.55, whereas poplar-type propolis had 2.08 mmol TE/g.…”

“…For assessment of TAC extracts of fast-growing trees and shrubs, other methods such as β-carotene bleaching assay (BCB), inhibition of linoleic acid peroxidation assay (ILAP) and superoxide anion radical scavenging activity (SRSA) are used less frequently. BCB assay was used to assess poplar wood activity (Todaro et al 2017), ILAP assay for willow bark (Durak and Gawlik-Dziki 2014), and SRSA to poplar buds and poplar-type propolis (Zhang et al 2015b).…”

Elicitation and treatment with precursors of phenolics synthesis improve low-molecular antioxidants and antioxidant capacity of buckwheat sprouts

“…It may include abiotic elicitors such as metal ions, inorganic compounds, chilling etc., and biotic elicitors from fungi, bacteria, viruses, plant cell wall components, as well as chemicals that are released at the attack site by plants under a pathogen or herbivore attack (e.g., signaling compounds such as salicylic acid, jasmonic acid) (Baenas et al, 2014;Matkowski, 2008). Willow bark is an excellent source of salicylic acid and its derivatives (Durak and Gawlik-Dziki, 2014) and its infusion have already been used for induction of plants metabolism (Gawlik--Dziki et al 2013;Świeca and Dziki, 2015). Salicylic acid (SA) is a well-known inducer of plant systematic acquired resistance (SAR) in plant-pathogen interaction.…”