scholarly journals Green Synthesis and Antimicrobial Potential of Silver/Gold Nanoparticles Functionalized with Debregeasia salicifolia D. Don

2020 ◽  
Vol 14 (4) ◽  
pp. 2513-2523
Author(s):  
Sami Bawazeer ◽  
Abdur Rauf ◽  
Khaliq Ur Rahman ◽  
Jawad Ali ◽  
Ghias Uddin ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Crude Extract ◽  
Radical Scavenging ◽  
Soluble Starch ◽  
Moderate Activity ◽  
Spectroscopic Techniques ◽  
Bacterial Strains ◽  
Gold And Silver Nanoparticles ◽  
Antibacterial And Antifungal Activities

The aim of the current study was to detect various secondary metabolites in the extract of Debregeasia salicifolia, and to synthesize stable silver/gold nanoparticles (Ag/AuNPs) from D. salicifolia methanol crude extract. The antioxidant, antibacterial, and antifungal activities of the methanol crude extract, various isolated fractions, and the synthesized nanoparticles were evaluated. Phytochemical analyses of the methanol extract/fractions indicated the presence of tannins, saponins, flavonoids, steroids, terpenoids, coumarins, emodins, and soluble starch. Gold and silver nanoparticles have been subsequently synthesized from the methanol crude extract by green synthesis, and characterized by UV and IR spectroscopic techniques. Size of the particles was determined with the aid of an atomic force microscope (AFM). The results revealed that the size of AuNPs was 5-100 nm, and that of AgNPs was in the range 5-100 nm. Bioactivity screening revealed that chloroform and n-hexane fractions exhibited significant 2,2-diphenyl-1-picrylhydrazyl (DPPH·) radical scavenging potential against quercetin. Additionally, the extract/fractions and AuNPs were also subjected to antimicrobial activity screening against a number of strains of microbes. Among extracts, n-hexane fraction showed good antifungal activity as compared to other fractions, whereas in the case of anti-bacterial activity, extract and fractions were active against Gram positive and Gram negative bacterial strain. AuNPs were exhibited moderate activity against all tested bacterial strains.

scholarly journals Synthesis, Characterization and Bioactivity Profiling of Gold Nanoparticles of Trachyspermum Ammi Crude Extract

2021 ◽  
Author(s):  
Saud Bawazeer ◽  
Abdur Rauf ◽  
Humaira Naz ◽  
Syed Uzair Ali Shah ◽  
Dania Saad Waggas ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Gold Nanoparticles ◽  
Bacillus Subtilis ◽  
Crude Extract ◽  
Broad Band ◽  
Soluble Starch ◽  
Klebsiella Pneumonia ◽  
Trachyspermum Ammi ◽  
Uv Visible

Trachyspermum ammi seeds were selected for photochemical study. The crude T. ammi methanol and aqueous extracts showed the presence of alkaloids, saponins, steroids, terpenoids, coumarins, betacyanins, flavonoids and soluble starch. The synthesis of gold nanoparticles (AuNPs) using T. ammi extract was characterized using UV-visible, and FT-IR spectroscopy. The appearance of sharp peak at 520 nm in the UV visible spectra, and the appearance of broad band nanoparticles spectra at 563.21 cm-1, 516.92 cm-1 and 462.92 cm-1 as well as the disappearance of the carboxyl OH bond and carbon-carbon triple bond supported the formation of AuNPs. The crude T. ammi methanol and AuNPs were investigated for antioxidant potential using DPPH· free radical assay, which shows that crude extract has significant antioxidant effect. The synthesized AuNPs was also evaluated for antibacterial activities against staphylococcus aureus, Klebsiella pneumonia and Bacillus subtilis. The crude extract showed activity against Bacillus subtilis, while AuNPs showed activity against staphylococcus aureus. The in vivo sedative effect and analgesic effect were enhanced in AuNPs treated animals in 5 times less dose (i.e., 5, and 10 mg/kg) than that of crude extract. It was concluded that T. ammi extract include capping and reducing agents, which make it capable to be developed as stable AuNPs. The biological action of AuNPs is either enhanced (sedative and analgesic) or changed (antibacterial activity), when compared with that of plant extract.

scholarly journals Extraction and Isolation of Compound from Roots of Kniphofia pumila, and Its Antibacterial Activities in Combination with Zinc Chloride

2020 ◽  
Vol 17 (7) ◽  
pp. 631-638
Author(s):  
Dele ABDISSA ◽  
Gezahegn FAYE ◽  
Melkamu FAYERA ◽  
Shiferaw DEMISSIE
Keyword(s):  
Antibacterial Activity ◽  
Crude Extract ◽  
Pathogenic Bacteria ◽  
Antibacterial Activities ◽  
Diffusion Method ◽  
Spectroscopic Techniques ◽  
Bacterial Strains ◽  
Pure Compound ◽  
Standard Drug ◽  
Isolated Compound

Kniphofia pumila has been traditionally used for the treatment of different diseases in Oromiya regional state, western part of Ethiopia. Thus, the main objective of this study was to extract bioactive natural products from the roots of K. pumila and perform in vitro antibacterial activity tests against selected pathogens. Extraction of compound from the roots of K. pumila was carried out by maceration method at room temperature and its antibacterial activity was done using agar disc diffusion method. The crude extracts alone and along with ZnCl2 were tested against pathogenic bacteria Escherichia coli (ATCC 25722), Klebsiella pneumoniae subsp. pneumoniae (DSM 19613), Staphylococcus aureus (ATCC 25925) and Salmonella Typhimurium (ATCC 13311). Following its promising activity, the acetone crude extract that have shown better antibacterial activity was subjected to column chromatography for isolation of pure compound. Hence, one pure compound (GZ-1) was obtained from acetone crude extract. Meanwhile, the antibacterial activities of the isolated compound alone and in combination with ZnCl2 were also performed against all aforementioned bacterial strains. Then, isolated compound was characterized by using NMR spectroscopic techniques such as 1H-NMR, 13C-NMR and, 2D NMR, so as to establish its structure as 3’-acetyl-2’,6’-dihydroxy-4-methoxyphenyl-1,8-dihydroxy-3-methylanthraquinone, trivial name knipholone. Finally, GZ-1 was isolated from the roots of K. pumila and it was noted that the antibacterial activities of ZnCl2 in combination with crude extract as well as with isolated compound against E. coli (ATCC 25722), S. aureus (ATCC 25925) and S. Typhimurium (ATCC 13311) bacterial strains showed remarkable results which were greater than the antibacterial activity of the positive standard drug (gentamycin). To sum up, from the chromatographic isolation of roots acetone extract of K. pumila one pure compound (knipholone) was obtained. Its antibacterial activity was also evaluated in combination with ZnCl2 salt and alone.

Flavonoids and triterpenes from Combretum fragrans with anti-inflammatory, antioxidant and antidiabetic potential

2018 ◽  
Vol 73 (5-6) ◽  
pp. 211-219 ◽  
Author(s):  
Amadou Dawé ◽  
Marius Mbiantcha ◽  
Fawai Yakai ◽  
Almas Jabeen ◽  
Muhammad Shaiq Ali ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Antidiabetic Activity ◽  
Moderate Activity ◽  
Spectroscopic Techniques ◽  
Asiatic Acid ◽  
Anti Inflammatory

Abstract Despite the well-documented benefits of Combretum fragrans in Cameroon, only few scientific works have been done on it. In this study we isolated eight compounds from the leaves extract of C. fragrans: velutin (1), belamcanidin (2), cirsilineol (3), cirsimaritin (4), 3β-acetoxy-20,24-epoxy-11,25-hydroxy-dammarane (5), combretin A (6), combretin B (7) and a mixture of arjunolic acid (8a) and asiatic acid (8b). Compounds 6 and 7 presented potent anti-inflammatory, antioxidant and antidiabetic activities. Compounds 1, 3, 5 and the mixture of 8a and 8b were significantly active, and compounds 2 and 4 presented moderate activity for reactive oxygen species inhibitory and free-radical scavenging. All compounds were isolated using chromatographic techniques; their structures were elucidated by spectroscopic techniques and their spectroscopic data compared with those of the literature. Anti-inflammatory activity was evaluated via the oxidative burst assay using a luminol-amplified chemiluminescence technique, antioxidant activity by free-radical scavenging activity (DPPH) and antidiabetic activity via α-glucosidase inhibition. All of the isolated compounds (1–8) were reported to exhibit significant antioxidant activity. Compounds 1, 3, and 5–8 exhibited potent chemiluminescence inhibition effect, and only compounds 6 and 7 inhibited α-glucosidase. Thus, C. fragrans can be used as an effective natural source of anti-inflammatory, antioxidant and antidiabetic compounds.

scholarly journals Structural Features of 1,3,4-Thiadiazole-Derived Ligands and Their Zn(II) and Cu(II) Complexes Which Demonstrate Synergistic Antibacterial Effects with Kanamycin

2020 ◽  
Vol 21 (16) ◽  
pp. 5735 ◽  
Author(s):  
Dariusz Karcz ◽  
Arkadiusz Matwijczuk ◽  
Daniel Kamiński ◽  
Bernadette Creaven ◽  
Ewa Ciszkowicz ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Metal Ion ◽  
Hydroxyl Group ◽  
Moderate Activity ◽  
Spectroscopic Techniques ◽  
Concomitant Treatment ◽  
Bacterial Strains ◽  
Thiadiazole Derivative ◽  
Metal Ratio ◽  
Thiadiazole Derivatives

Classical synthetic protocols were applied for the isolation of three novel 1,3,4-thiadiazole derivatives which were then complexed with the biologically important Cu(II) and Zn(II) ions. All free ligands and their corresponding complexes were characterized using a number of spectroscopic techniques including Ultraviolet-visible (UV–vis), Fluorescence, Infrared (FT-IR), tandem liquid chromatography-mass (LC-MS), X-ray diffraction (XRD), and Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C, HSQC, HMBC). The results obtained are consistent with the formation of dihydrate complexes, in which the chelation of the metal ion occurs via one of the thiadiazole nitrogen atoms and the deprotonated hydroxyl group of the neighboring resorcynyl moiety. The Zn(II) complexes utilize a 1:1 ligand–metal ratio, while in the Cu(II) complexes the ligand–metal ratio is 2:1. Although the antibacterial testing identified moderate activity of the compounds against the tested bacterial strains and additionally modest antioxidant activity, a strong synergistic antibacterial effect against Staphylococcus aureus, using concomitant treatment of thiadiazole derivatives with the commercial antibiotic kanamycin, was observed. The most active thiadiazole derivative demonstrated a minimal inhibitory concentration (MIC) of 500 μg/mL while it was 125 μg/mL in the presence of kanamycin. Moreover, in the presence of few thiadiazole derivatives the MIC value of kanamycin decreased from 0.39 μg/mL to 0.5 μg/mL. The antioxidant activity (IC50) of the most active thiadiazole derivative was determined as 0.13 mM which was nearly three-fold lower compared to that of TROLOX (0.5 mM).

scholarly journals Green Synthesis of Gold Nanoparticles Mediated by Garcinia Fruits andTheir Biological Applications

2020 ◽  
Vol 27 (2) ◽  
pp. 238-250
Author(s):  
Azazahemad A Kureshi ◽  
Hiral M Vaghela ◽  
Satyanshu Kumar ◽  
Raghuraj Singh ◽  
Premlata Kumari
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Cell Line ◽  
Cancer Cell ◽  
Antibacterial Properties ◽  
Cancer Cell Line ◽  
Water Soluble ◽  
Aqueous Extracts ◽  
Bacterial Strains ◽  
Mcf 7

Background: Green synthesis of gold nanoparticles (AuNPs) using medicinal plant extract is an emerging area of research due to their applicability in nanomedicines. Methods: In this study, aqueous extracts prepared from fruit-pericarps of two Garcinia species, G. indica (GI) and G. cambogia (GC) fruits which are important medicinally and commercially have been utilized for the synthesis of AuNPs. Various analytical techniques were utilized to characterize the synthesized AuNPs. The synthesized AuNPs were investigated for their biological properties such as antioxidant activity using the (2,2-diphenyl-1-picrylhydrazyl) DPPH model, cytotoxicity against MCF-7 (breast) cancer cell line, and antibacterial activity against two bacterial strains viz. B. subtilis and E. coli. Results: The absorption peak of the AuNPs is observed at 541 nm using UV–Visible spectroscopy. The high resolution – scanning electron microscopy images showed spherical with a triangular shape AuNPs and their average sizes were ranging from 2 – 10 nm and it was found to be in good agreement with the particle size of 8 – 11 nm determined using X-ray diffraction analysis. Fourier-transform infrared spectroscopy revealed that water-soluble biomolecules from the aqueous extracts of the Garcinia species played a crucial role in the formation of AuNPs. The synthesized AuNPs exhibited considerable cytotoxicity with IC50 values 34.55 µg/ml (GI) and 35.69 µg/ml (GC) against the MCF-7 cancer cell line. Furthermore, synthesized AuNPs also demonstrated significant antioxidant and antibacterial properties comparable to the standards used. Conclusion: AuNPs have been synthesized using a simple green approach. The synthesized AuNPs demonstrated promising cytotoxicity, antioxidant, and antibacterial properties.

scholarly journals Antioxidant, hemolytic, antimicrobial, and cytotoxic activities of the tropical Atlantic marine zoanthid Palythoa caribaeorum

2015 ◽  
Vol 87 (2) ◽  
pp. 1113-1123 ◽  
Author(s):  
DANIEL B. ALENCAR ◽  
ARTHUR A. MELO ◽  
GISELLE C. SILVA ◽  
REBECA L. LIMA ◽  
KELMA M.S. PIRES-CAVALCANTE ◽  
...  
Keyword(s):  
Crude Extract ◽  
Marine Invertebrates ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Cytotoxic Activities ◽  
Slight Variation ◽  
Bacterial Strains ◽  
Antioxidant Power ◽  
Palythoa Caribaeorum ◽  
Ferric Reducing Antioxidant Power

Marine invertebrates are capable of synthesizing bioactive compounds, which may be beneficial to human health. The aim of this study was to evaluate the antioxidant, hemolytic, antimicrobial and cytotoxic activities of crude extract (70% EtOH), and dichloromethane (DCM), ethyl acetate (EtOAc), and aqueous (Aq) fractions of the marine zoanthid Palythoa caribaeorum. The phenolic compound contents of the crude extract, DCM, EtOAc and Aq fractions were 12.33, 18.17, 10.53, and 3.18 mg GAE per gram, respectively. DPPH radical scavenging activity showed slight variation. IC50 of crude extract, DCM, EtOAc and Aq fractions were 11.13, 11.25, 11.74, and 11.28 µg mL-1, respectively. Among the sample, ferrous ion chelating was the highest in crude extract (IC50 302.90 µg mL-1), followed by EtOAc, Aq, and DCM fractions with 457.77, 547.91, and 641.82 µg mL-1, respectively. Ferric-reducing antioxidant power showed optical density at about 0.5. The samples tested exhibited low hemolytic activity under 10% up to a concentration of 50 μg mL-1. No antimicrobial activity was observed against any of the tested bacterial strains. For the cytotoxic activity, LC50 of DCM, crude extract, EtOAc, and Aq were 52.10, 83.06, 86.34, and 117.45 μg mL-1, showing high toxicity.

scholarly journals Screening of Antibacterial and Antioxidant Activity from the Soft Corals Sinularia sp. and Sarcophyton sp. Origin Palu Bay, Central Sulawesi, Indonesia

2019 ◽  
Vol 14 (2) ◽  
pp. 73
Author(s):  
Wendy Alexander Tanod ◽  
Didit Kustantio Dewanto ◽  
Samliok Ndobe ◽  
Putut Har Riyadi ◽  
Masteria Yunovilsa Putra
Keyword(s):  
Antioxidant Activity ◽  
Antibacterial Activity ◽  
Crude Extract ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Moderate Activity ◽  
Soft Corals ◽  
Strong Activity ◽  
E Coli ◽  
Central Sulawesi

This study aimed to evaluate the potential antibacterial and antioxidant activities of Sinulariasp. and Sarcophyton sp. from the Palu Bay, Central Sulawesi, Indonesia. Soft corals were identified as Sinulariasp. (SC1), Sinularia sp. (SC2), andSarcophytonsp. (SC3). Antibacterial activity was examined using agar diffusion well method. Antioxidant activity was measured by the DPPH radical scavenging method. The samples were macerated in MeOH: DCM. The crude extracts were partitioned with DCM, EtOAc, and BuOH. The crude extract of Sinulariasp. (SC2) showed a very strong antibacterial activity as it was able to inhibit the growth of Staphylococcus aureusand Escherichia coliup to 10 mg/mL. Sinularia sp. (SC1) crude extract showed strong activity againstS. aureus, whereas it showed moderate against E. coli.Sarcophyton sp. (SC3) crude extract showed moderate activity against S. aureus, whereas it showed weak against E. coli. The partition fractions of the three soft coral extracts had the potential to be a potent antioxidant agent.

scholarly journals Biological studies concerning the antioxidant and antimicrobial activities of Pelargonium species cultivated in Egypt (Family-Geraniaceae)

2015 ◽  
Vol 4 (2) ◽  
pp. 340-342
Author(s):  
Abdel Nasser Badawy Singab ◽  
Hala Mohamed El-Hefnawy ◽  
Dalia Galal El-Kolobby
Keyword(s):  
Free Radical ◽  
Radical Scavenging ◽  
Moderate Activity ◽  
Dependent Manner ◽  
Market Place ◽  
Bacterial Strains ◽  
Concentration Dependent Manner ◽  
Biological Studies ◽  
Successive Extraction ◽  
Soxhlet Apparatus

Plant-derived pharmaceuticals have become prominent in the market place, making it a favored healthcare choice. In this study, air dried samples of aerial parts of Pelargonium X fragrans Willd. and Pelargonium peltatum L’Hérit. were separately extracted using successive extraction with a soxhlet apparatus. Each extract was tested for its antimicrobial activity using two Gram-negative bacterial strains (Pseudomonas aeruginosa and Escherichia coli), two Gram-positive bacterial strains (Bacillus subtillus and Staphyllococcus aureus), and clinical fungal isolates (Aspergillus niger and Candida albicans). Also, their antioxidant activity was tested using a DPPH free radical assay. The ethyl acetate, n-Butanol and the total extracts showed moderate activity against the tested microorganisms with significant high activity against E. coli. The free radical scavenging property was found to be in a concentration dependent manner in all the tested fractions. The most effective antioxidant fractions in both spp. was the n-Butanol fraction (85% and 85.2%) at the concentration of 0.375µg/ml followed by the total ethanolic extracts (78.1% and 84.62%), respectively, with the same concentration compared to the standard reference ascorbic acid which showed a significant radicals scavenging potential (79.1%) in the concentration of 1µg/ml.DOI: http://dx.doi.org/10.3329/icpj.v4i2.21481 International Current Pharmaceutical Journal, January 2015, 4(2): 340-342

Sign in / Sign up

Export Citation Format

Share Document