Plants are good sources of various bioactive substances and have significant importance for the discovery of new drugs. In this study, Croton macrostachyus plant roots from six different sites in the Central Gondar Zone, Ethiopia, were collected; and their phenolic and flavonoid contents, as well as antioxidant and antibacterial activities were investigated. Total phenolics and flavonoid contents of the root extracts were determined by the Folin–Ciocalteu and aluminum chloride methods, respectively. The antioxidant activity was determined by the DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging method. Moreover, the antibacterial activities were evaluated by disk diffusion method. Results revealed that total polyphenols and flavonoid contents were in the range of 802 ± 53–1557 ± 75 mg GAE/100 g and 342 ± 26–745 ± 32 mg CE/100 g, respectively. Root extracts of C. macrostachyus were found to have higher antioxidant activities ranging from 3.53 ± 0.38 to 6.38 ± 0.62 mg AAE/g sample. They also showed inhibition zones of 5.8, 6.2, 5.9 and 6.0 mm for Staphylococcus aurous, Staphylococcus pneumonia, Escherichia coli and Klebsiella pneumonia, and had equivalent potency with the reference Gentamicin antibiotic. Pearson correlation result indicated a strong relationship between total polyphenol contents and their respective antioxidant activities. This study articulates that the root extracts accumulated a substantial quantity of polyphenols and bears a considerable antioxidant activity.

Background: Rhus vulgaris is rich in various classes of polyphenols and flavonoids that act as free radical scavengers and reduce oxidative stress and cure various harmful human diseases. The plant is a traditionally known medicinal plant which is used against a number of diseases including cancer. Methods: The current investigation points towards the investigating quantitative phenolic contents, flavonoid contents and the free radical scavenging activity & antioxidant activity of Rhus vulgaris extract in n-hexane, acetone, and 80% of aqueous methanol. The phenolic contents were estimated by Folin–Ciocalteu procedure and gallic acid as a reference molecule whereas the total flavonoid contents were determined by using aluminum chloride and catechin. In addition, the dilution serial method was used to evaluate the leaves extract of rhus vulgaris, and the DPPH (2,2-diphenyl-1-picrylhydrazyl) method was utilized to assess the above-mentioned extracts against oxidative stress. Results: The result revealed that the ranges of total phenolic content from 5.82 ± 4.6 to 83.15 ± 7.6 mg GAE/g of the dry weight of extract, expressed as gallic acid equivalents. The total flavonoid concentrations were varied from 2.21 ± 7.34to 23.47 ± 4.87 mg CE/g, expressed as catechin equivalents. Antioxidant activity of extracts was expressed as the concentration of DPPH radical’s inhibition ranges from 1.2 ± 0.32 to 22.86 ± 3.71 mg AAE/ g. Conclusion: The 80% aqueous methanolic extract of Rhus vulgaris showed the highest phenolic and flavonoid contents and strong antioxidant potential and it could be used as antibiotics for different curable and incurable diseases.

Background Rhus vulgaris is rich in various polyphenols and flavonoids that act as free radical scavengers, reduce oxidative stress, and cure various harmful human diseases. Traditionally, the plant is used to treat various diseases including cancer. Methods This study involved extraction using the solvents hexane, acetone, and 80% aqueous methanol, phytochemical screening, and antimicrobial testing. Using the spectrophotometric techniques of Folin-Ciocalteu and aluminum chloride, respectively, the plant's total phenolic and flavonoid contents were determined. The extracts' activity was assessed with the help of the (DPPH) radical scavenging assay. Results The extracts mostly contain alkaloids, phenols, flavonoids, glycosides, tannins, steroids, carbohydrates, and anthraquinones. Compared to the standard, the methanol extracts showed better inhibitory zones. Results revealed that total polyphenols and flavonoid contents were in the range of 5.82 ± 0.6–83.23 ± 0.6 mg GAE/100 g and 2.21 ± 0.34–23.47 ± 0.87 mg CE/100 g, respectively. Leaves extracts of R.vulgaris was found to have higher antioxidant activities ranging from 0.756 ± 0.8 to 131.56 ± 0.6 mg AAE/g sample. Conclusion The R. vulgaris 80% methanolic extract displayed the highest phenolic and flavonoid concentrations as well as a powerful antioxidant capacity. It could be used as an antibiotic for different curable and incurable diseases.

BackgroundDespite the availability of information about the effect of aqua-surfactants media on the stability of binary complexes, data related to mixed ligand complexes of Phen and Orn with essential metals in aqua-surfactant medium is scarce. The aim of this study was, to determine the stabilities of the mixed ligand complexes of essential metal ions (Co 2+ , Ni 2+ , Cu 2+ ) with Phen and Orn in aqua-TBAB and PEG-400 surfactants with an eye on the prediction of the bioavailability of the metal complexes. ResultsComplexes of some essential metal (M) ions (Co 2+ , Ni 2+ , Cu 2+ ) of L-ornithine (L) and 1,10-phenanthroline (X) ligands in various concentrations (0.0-2.5% v/v) of aqueous tetrabutylammonium bromide (TBAB) or polyethylene glycol-400 (PEG-400) surfactant were synthesized pH-metrically at 298 K and 0.16 mol L − 1 ionic strength. The relative amounts of L:M:X were 2.