Antioxidant activity tests

The essential oils were also tested for their antioxidant, anti-imflammatory, antimicrobial and cytotoxic activities. The HD essential oil sample showed inhibitory activity against 6/8 tested microorganisms, i.e., Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Bacillus subtillis, Candida albicans, and Saccharomyces cerevisiae. The MHD and EHD exhibited the inhibitory activity against three strains E. coli, A. niger and F. oxysporum. The UHD inhibited E. coli and F. oxysporum.

9p dianmotminh02 03-05-2024 8 1   Download

Hydnophytum formicarum is a medicinal plant that has a variety of bioactive compounds and has been traditionally used for therapeutic purposes. Hydnophytum formicarum grows on the stems of large trees and in a symbiosis with a type of ants. This study investigates the effects of technological factors on the extraction process of Hydnophytum formicarum in n-hexan, ethyl acetate, and ethanol solvents by using the Soxhlet method.

6p vijaguar 16-11-2022 10 1   Download

The results showed that the extraction solvents and wheat varieties significantly altered the total phenolics and antioxidant activity of whole wheat and bran, and 50% acetone is a recommended solvent for extracting phenolic compounds from the tested wheat and bran.

5p schindler 30-12-2021 13 0   Download

The essential oil, obtained from the aerial parts of the plant, exhibited high AChE inhibitory activity, consisting of mainly 1,8-cineol (58.89%). The antioxidant activity according to 6 complementary tests and anticholinesterase potential of the methanol extracts and triterpenoids α-amyryltetracosanoate, oleanolic acid, ursolic acid, and sitosterol acetate were also investigated, and methanol extract exhibited the highest antioxidant and anticholinesterase activity, surpassing the other tested extracts and pure compounds.

14p langthannam 29-12-2021 14 1   Download

The new compounds 7a–k, 8a–k, and 9a–k were synthesized from flavonones 4–6, which can be considered new precursors for quinoline synthesis through a one-step reaction. All the target compounds (7a–k, 8a–k, and 9a–k) were evaluated for their in vitro antimicrobial activity against nine test microorganisms. They showed the most activity against Mycobacterium smegmatis with minimum inhibitory concentrations (MIC) of 62.5–500 µg/mL, indicating their potential uses as antituberculosis agents. Among them 8a–k (m-fluoride) were the most active compounds against M. smegmatis (MIC, 62.5–125 µg/mL).

17p langthannam 29-12-2021 11 0   Download

The obtained extract exhibited satisfying antioxidant activity with an inhibition percentage of 93.76±0.41 at a concentration of 300 µg/mL and IC50 of 83.64µg/mL by the DPPH method. The tested extract showed also a good antioxidant activity using β-carotene test. At resin concentration of 100 µg/mL antifungal tests showed, inhibition rates of 58.9%, 58.44%, 41.36% and 34.43% against T. tonsurans, T. equinum, T. rubrum and T. mentagrophytes respectively. Upon the obtained results, this extract can be used as external treatments for wounds to prevent oxidation and fungal infections.

6p mudbound 10-12-2021 8 1   Download

As a starting material, 7-tert-butyldibenzo [b,e] [1,4] dioxine-2,3-dicarbonitrile was prepared by the reaction of 4-tert-butylcatechol with 4,5-dichlorophthalonitrile. Metallophthalocyanine complexes (4–7) were obtained by cyclotetramerization of 7-tert-butyldibenzo [b,e] [1,4] dioxine-2,3-dicarbonitrile. All compounds were characterized by elemental analysis and other spectroscopic methods (IR, UV/Vis, and 1 H NMR). Phthalocyanine compounds remained nonaggregated in tetrahydrofuran at the studied concentration ranges.

12p tudichquannguyet 29-11-2021 19 1   Download

2-Substituted 8-propargyloxyquinoline derivatives have been synthesized from 2-substituted-8-hydroxyquinolines by O-propargylation method (30%–98% yields). The newly synthesized compounds were tested for in vitro antioxidant activities such as DPPH radical scavenging, ferrous chelating, and reducing power activities. The maximum radical scavenging (46.5%) and reducing power activities were obtained from 1 and maximum ferrous chelating effect was obtained from 6 (72.1%) at the concentration of 500 µg/mL. To indicate DNA binding activity of the complexes calf thymus DNA was used.

12p tudichquannguyet 29-11-2021 14 1   Download

A series of new extensively conjugated E -stilbene azomethines (5a–5h) were synthesized and screened for their antioxidant and antimicrobial activity. The compounds were tested against bacterial (Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Bacillus subtilis) and fungal strains (Aspergillus niger, A. flavus, and Trichoderma harzianum) using the agar well diffusion method.

16p tudichquannguyet 29-11-2021 18 1   Download

N-acetylcysteine amide (NACA) is a new antioxidant molecule with powerful radical scavenging properties. The aim of this study was to investigate neuroprotective effects of NACA against paraquat (PQ) toxicity in the midbrains of rats by using motor coordination tests and biochemical and histological analysis. Thirty adult Wistar albino rats were divided into three groups: Group 1: control (n = 10), Group 2: PQ (10 mg/kg) (n = 10), and Group 3: PQ (10 mg/kg) + NACA (100 mg/kg) (n = 10). NACA was administrated intraperitoneally 30 min before PQ injection.

11p tudichquannguyet 29-11-2021 6 1   Download

In the present study, the antioxidant properties of peripherally and nonperipherally water-soluble tetra (quinoline 5-sulfonic acid) substituted metal-free (1, 2), Zn(II) (3, 4), Co(II) (5, 6), and Mn(III)Cl (7, 8) phthalocyanine (Pc) derivatives were reported. In order to determine the antioxidant properties of the Pc compounds, three different commonly known antioxidant methods were used: DPPH (α,α-diphenyl-β-picrylhydrazyl) radical scavenging, ferrous ion chelating, and reducing power assays.

10p tudichquannguyet 29-11-2021 10 0   Download

Schiff base derivatives with anthracene- and pyrene-based units, A1-A6 and P1-P6 were synthesized (89%–99% yields). Schiff base derivatives were designed to possess an heterocyclic moiety on one side to enhance the coordination ability towards metals. To investigate the biological assay of the newly synthesized compounds, their DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging, metal chelating, reducing power, antibacterial and DNA binding activities were tested. A6 (63.1%) showed the maximum free radical scavenging activity among all.

16p tudichquannguyet 29-11-2021 7 2   Download

Antimicrobial and antioxidant effects of essential oils from Murraya koenigii commonly known as curry leaf oil and Cinnamon cassia cinnamon bark oil were determined. These essential oils were taken at concentrations of 1, 1.5, 2, 2.5 and 3%. Antimicrobial activity was tested for both the oils were tested against 6 microbial strains of two gram positive, 2 gram negative and one yeast and mold.

8p chauchaungayxua8 03-10-2020 16 1   Download

The best results for antimicrobial activity against test pathogens and positive bile salt hydrolase activity in the presence of sodium taurodeoxycholate have also been observed in these cultures. Yoghurt cultures ST 144 and LB 144 had the highest antioxidative activity 78.30 ± 0.12, and 76.13 ± 0.12 UmL-1 , respectively. In conclusions, yoghurt cultures ST 144 and LB 144 exhibited the promising probiotic properties with additional functional properties such as antioxidant and proteolytic activity.

21p caygaocaolon7 18-09-2020 16 1   Download

Protein, micronutrient, antioxidant potential, polyphenols and phytate content of popular hybrids and composites of pearl millet has been estimated for two consecutive seasons. Crude protein content of pearl millet hybrids and composites analyzed varied from 9.49 to 13.09 and 9.05 to 14.73 %, Fe content from 39 to 66 and 22 to 75 mg/kg, Zn content from 32 to 49 and 21 to 56 mg/kg, polyphenols from 210 to 297 mg/100 g and 221 to 345 mg/100 g, and phytate content from 4.74 to 6.29 and 5.54 to 6.67 mg/g during kharif-2013 and kharif-2014, respectively.

11p chauchaungayxua6 26-06-2020 9 0   Download

New ruthenium(III) complexes with 3-(Benzothiazol-2-yliminomethyl)-phenol (HL) ligand have been synthesized and characterized with the aid of elemental analysis, IR, electronic, and electron paramagnetic resonance spectroscopic techniques.

12p tocectocec 25-05-2020 9 2   Download

The present study was designed to evaluate in vitro antimicrobial activity and antioxidant activity and anticancer activity of different five extracts of Euphorbia tirucalli Stem. Plant roots were extracted in different five solvents viz. Hexane, Chloroform, Methanol, Water and Methanol: Water (90:10) through Soxtherm according to polarity gradients. Aiming to investigate antimicrobial activities, agar well diffusion method was followed using five pathogenic bacteria and five fungi as test organisms.

9p kethamoi4 18-04-2020 10 1   Download

Cereals and pulses are the rich sources of protein and energy and thus hold an important place in human diet mainly in developing countries. In present study, pod coats of locally grown pulse crops (cowpea, mungbean and mothbean) were tested for various phytochemical constituents and antioxidant activity. Pod coats of these pulse crops were extracted with three solvents (acetone, ethylacetate and chloroform) and tested for total phenols, flavonoids, tannins, tocopherols and DPPH free radical scavenging activity.

8p quenchua4 06-04-2020 10 1   Download

The essential oil (EO) obtained from the leaves of thyme (Thymus vulgaris L.) grown in Vietnam was found to contain thymol (39.79 %), cymene (17.33 %), and γ-terpinene (13.45 %) as the main volatile components. The antimicrobial activities of this oil were screened against several food-borne bacteria and fungi species. Significant growth inhibition effects against food-borne bacteria Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), Bacillus cereus (B. cereus), and Salmonella Typhimurium were observed using the standard disc diffusion method.

10p chauchaungayxua2 07-01-2020 31 1   Download

Sophorolipid (SL) is a biosurfactant belonging to the glycolipids group and was produced by harmless Candida bombicola ACTT22214 and has been widely used in many fields in our life. In order to search for appropriate condition for C. bombicola fermentation producing SL with high efficiency, this study focused on the investigation of the soy oil concentration, molasses concentration, fermentation time, pH and temperature. SL products were tested for antimicrobial activity, antioxidant, emulsifier, foaming ability. The highest content of SL was 43.27 ± 0.

13p sabiendo 02-01-2020 13 1   Download