scholarly journals Chemical Constituents of the Marine-Derived Fungus Aspergillus sp. SCS-KFD66

Marine Drugs ◽  
2018 ◽  
Vol 16 (12) ◽  
pp. 468 ◽  
Author(s):  
Chang-Liang An ◽  
Fan-Dong Kong ◽  
Qing-Yun Ma ◽  
Qing-Yi Xie ◽  
Jing-Zhe Yuan ◽  
...  
Keyword(s):  
Fermentation Broth ◽  
Chemical Constituents ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
X Ray Diffraction ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
Aspergillus Sp ◽  
New Compounds ◽  
Dpph Radical Scavenging

Five new compounds named asperpenes A-C (1–3), 12,13-dedihydroversiol (4), and methyl 6-oxo-3,6-dihydro-2H-pyran-4-carboxylate (5), along with 10 known compounds (6–15), were isolated from the fermentation broth of Aspergillus sp. SCS-KFD66 associated with a bivalve mollusk, Sanguinolaria chinensis, collected from Haikou Bay, China. The structures of the compounds, including the absolute configurations of their stereogenic carbons, were unambiguously determined by spectroscopic data, single-crystal X-ray diffraction analysis, and electronic circular dichroism (ECD) spectral analysis, along with quantum ECD calculations. The growth inhibitory activity of the compounds against four pathogenic bacterial (Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 6538, Listeria monocytogenes ATCC 1911, and Bacillus subtilis ATCC 6633), their enzyme inhibitory activities against acetylcholinesterase and α-glucosidase, and their DPPH radical scavenging activity were evaluated.

scholarly journals Phytochemical and Biological Investigations of Ixora arborea Roxb.

1970 ◽  
Vol 8 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Fahima Aktar ◽  
Md Abul Kaisar ◽  
ANM Hamidul Kabir ◽  
Choudhury M Hasan ◽  
Mohammad A Rashid
Keyword(s):  
Petroleum Ether ◽  
Brine Shrimp ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Spectroscopic Studies ◽  
Total Phenolic ◽  
Brine Shrimp Lethality ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
Ic50 Value

A total of four compounds namely betulin (1), erythrodiol (2), lupeol (3), and stigmasterol were isolated from the leaf extract of Ixora arborea for the first time. The structures of the isolated compounds were established by extensive spectroscopic studies. In our preliminary screening, the petroleum ether, carbon tetrachloride, dichloromethane and aqueous soluble fractions of the methanol extract were subjected to antioxidant, antimicrobial and brine shrimp lethality bioassays. All of the fractions showed significant antioxidant activity along with the total phenolic content, of which the methanolic extract of leaves (MEL) showed the highest free radical scavenging activity with IC50 value 33.0 μg/ml. In the brine shrimp lethality bioassay, among all the extractives the petroleum ether soluble fraction (PESF) demonstrated significant cytotoxicity with LC50 value of 0.622 μg/ml. However, in case of antimicrobial screening, only the methanolic crude extract showed mild growth inhibitory activity against the tested microorganisms. Key words: Ixora arborea; betulin; erythrodiol; lupeol; stigmasterol; antioxidant; cytotoxicity; antimicrobial DOI: 10.3329/dujps.v8i2.6031 Dhaka Univ. J. Pharm. Sci. 8(2): 161-166, 2009 (December)

scholarly journals Phenolic Constituents of Leaves of Diospyros Montana

2007 ◽  
Vol 2 (1) ◽  
pp. 1934578X0700200 ◽  
Author(s):  
Toshiyuki Tanaka ◽  
Miyuki Furusawa ◽  
Tetsuro Ito ◽  
Ibrahim Iliya ◽  
Masayoshi Oyama ◽  
...  
Keyword(s):  
Spectroscopic Analysis ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Flavonol Glycosides ◽  
Scavenging Activity ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Phenolic Constituents ◽  
New Compounds ◽  
Dpph Radical Scavenging

Five flavonol glycosides (1–5) and two naphthalene dimer glycosides (7 and 8), including three new compounds (1, 2 and 8), were isolated from the leaves of Diospyros montana. The structures of the isolated compounds were determined by spectroscopic analysis. One of the isolated compounds (1) showed DPPH radical scavenging activity.

scholarly journals Antimicrobial and Antioxidant Activities of a Malaysian Medicinal Plant Anisophyllea Disticha (Jack) Baill. And Quantification of Its Phenolic Constituents

2021 ◽  
Vol 50 (3) ◽  
pp. 515-521
Author(s):  
Nurul Ashikin Abdul Bari ◽  
Sahena Ferdosh ◽  
Md Zaidul Islam Sarker
Keyword(s):  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Total Phenolic ◽  
High Positive Correlation ◽  
Antioxidant Power ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
Phenolic Constituents ◽  
Ferric Reducing Antioxidant Power

The ethanolic extracts of different parts of Anisophyllea disticha were tested for antimicrobial capability using disc diffusion assay. The result revealed positive growth inhibitory activity, but was considered weak for all extracts against Gram positive bacteria. Leaf extract displayed the highest zone of inhibition with values of 10.67 ± 0.58 and 8.67 ± 0.58 mm against Staphylococcus epidermidis and S. aureus, respectively. On the other hand, stem showed the highest amount of total phenolic content (TPC) (27.73 ± 4.10 mg GAE/g extract) and similar trend was also observed in antioxidant potential in terms of DPPH radical scavenging activity (66.20 ± 11.74%) and ferric reducing antioxidant power assay (FRAP) (203.63 ± 16.03 mg Fe(II)/g extract). High positive correlation was found between TPC and antioxidant activities, suggesting that phenolic compounds contribute to the antioxidant power of plant extracts. HPLC analysis identified and quantified gallic acid, p-coumaric, ferulic acid and quercetin in the extracts. Bangladesh J. Bot. 50(3): 515-521, 2021 (September)

scholarly journals Facile Green Synthesis and Biological Activities of Silver Nanoparticles using Coldenia procumbens Linn.

2019 ◽  
Vol 31 (12) ◽  
pp. 2903-2908
Author(s):  
G. Usha Rani ◽  
B. Kesava Rao ◽  
P. Asha Bhanu ◽  
G. Swapna
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Biological Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Potential Applications ◽  
Uv Visible ◽  
Dpph Radical Scavenging

The facile green synthesis of silver nanoparticles is finding an imperative use in different fields due to their potential applications. The present study is focused on the green synthesis of silver nanoparticles from Coldenia procumbens Linn., in an eco-friendly way in order to reduce the toxicity from chemical methods. The zeta potential, size of the silver nanoparticles was measured and the characterization was done from UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The disc diffusion method has used to evaluate the antimicrobial efficacy of synthesized nanoparticles with different bacterial pathogens and the antioxidant capability of silver nanoparticles was tested and has shown significant DPPH radical scavenging activity.

scholarly journals Four New Flavonoids Isolated from the Aerial Parts of Cadaba rotundifolia Forssk. (Qadab)

Molecules ◽  
2019 ◽  
Vol 24 (11) ◽  
pp. 2167 ◽  
Author(s):  
Gadah Abdulaziz Al-Hamoud ◽  
Raha Saud Orfali ◽  
Sachiko Sugimoto ◽  
Yoshi Yamano ◽  
Nafee Alothyqi ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Chemical Constituents ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
2D Nmr ◽  
Phytochemical Study ◽  
Aerial Parts ◽  
Glycation End Products ◽  
Ic50 Values ◽  
New Compounds

Cadaba rotundifolia (Forssk.) (family: Capparaceae; common name: Qadab) is one of four species that grow in the Red Sea costal region in the Kingdom of Saudi Arabia. The roots and leaves of C. rotundifolia is traditionally used to treat tumors and abscesses in Sudan. A previous phytochemical study of the roots yielded a quaternary alkaloid, but no report on chemical constituents of the aerial parts of the C. rotundifolia growing in Saudi Arabia has been issued so far. Oxidative stress and advanced glycation end products (AGEs) are thought as causal factors in many degenerative diseases, such as Alzheimer’s disease, diabetes, atherosclerosis and aging. In this study, a total of twenty compounds, including four previously undescribed acylated kaempferol glucosides, were isolated from the aerial parts of C. rotundifolia collected in Saudi Arabia. These new compounds were identified as kaempferol 3-O-[2-O-(trans-feruloyl)-3-O-β-d-glucopyranosyl]-β-d-glucopyranoside (1), kaempferol 3-O-β-neohesperidoside-7-O-[2-O-(cis-p-coumaroyl)-3-O-β-d-glucopyranosyl]-β-d-glucopyranoside (2), kaempferol 3-O-[2,6-di-O-α-l-rhamnopyranosyl]-β-d-glucopyranoside-7-O-[6-O-(trans-feruloyl)]-β-d-glucopyranoside (3) and kaempferol 3-O-[2,6-di-O-α-l-rhamnopyranosyl]-β-d-glucopyranoside-7-O-[6-O-(trans-p-coumaroyl)]-β-d-glucopyranoside (4). Their structures were established based on UV-visible, 1D, 2D NMR, and HR-ESI-MS analyses. Of the assayed compounds, 17 and 18 showed potent radical scavenging activity with IC50 values of 14.5 and 11.7 µM, respectively, and inhibitory activity toward AGEs together with compound 7 with IC50 values 96.5, 34.9 and 85.5 µM, respectively.

scholarly journals Salumycin, a New Pyrazolequinone from a Streptomyces albus J1074 Mutant Strain

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4098
Author(s):  
Kaixiang Tao ◽  
Taijia Ye ◽  
Mingming Cao ◽  
Xiaolu Meng ◽  
Yuqing Li ◽  
...  
Keyword(s):  
Natural Products ◽  
Mutant Strain ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
X Ray Diffraction ◽  
Nmr Data ◽  
Streptomyces Albus ◽  
Infrared Spectrometer ◽  
Dpph Radical Scavenging ◽  
Streptomyces Albus J1074

Heterocyclic natural products with various bioactivities play significant roles in pharmaceuticals. Here, we isolated a heterocyclic compound salumycin (1) from a Streptomyces albus J1074 mutant strain. The structure of (1) was elucidated via single-crystal X-ray diffraction, mass spectrometry (MS), fourier transform infrared spectrometer (FTIR), and nuclear magnetic resonance (NMR) data analysis. Salumycin (1) contained a novel pyrazolequinone ring, which had never been previously reported in a natural product. Salumycin (1) exhibited moderate 2,2′-diphenyl-1-picrylhydrazyl (DPPH)-radical scavenging activity (EC50 = 46.3 ± 2.2 μM) compared with tert-butylhydroquinone (EC50 = 4.7 ± 0.3 μM). This study provides a new example of discovering novel natural products from bacteria.

Carum copticum L. essential oils as natural antimicrobial and antioxidant

2018 ◽  
Vol 44 (4) ◽  
pp. 515-520
Author(s):  
M Kazemi
Keyword(s):  
Essential Oils ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Carum Copticum ◽  
Microbial Strains ◽  
Pharmaceutical Industries ◽  
Dpph Radical Scavenging ◽  
Antioxidant Effects

Carum copticum L. comprises several relevant species for food, cosmetic, perfumery and pharmaceutical industries. GC/MS analysis of the enential oil of C. copticum revealed γ- terpinene as a major component of C. copticum, with its contribution of 33.85%. Essential oils (EOs) exhibited a significant antimicrobial activity against all tested microbial strains. In addition, the C. copticum oil demonstrated the highest DPPH radical scavenging activity. These results clearly show the antimicrobial and antioxidant effects of the plant essential oil.

Investigation of Compounds and Biological Activity of Selected Indonesian Marine Sponges

2020 ◽  
Vol 10 (3) ◽  
pp. 312-321
Author(s):  
Idin Sahidin ◽  
Carla W. Sabandar ◽  
Wahyuni ◽  
Rini Hamsidi ◽  
Sandra Aulia Mardikasari ◽  
...  
Keyword(s):  
Biological Activity ◽  
Antioxidant Activities ◽  
Chemical Constituents ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Marine Sponges ◽  
Chemical Screening ◽  
Methanol Extracts ◽  
Ms Analysis ◽  
Antioxidant Agents

Background: Marine sponges provided a great source of natural products with promising biological activity. This study was aimed to investigate the chemical constituents of methanol extracts of selected Indonesian marine sponges (Callyspongia sp., Clathria sp., Melophlus sarasinorum, and Xestospongia sp.), collected from the Saponda Islands, Southeast Sulawesi, Indonesia as well as to evaluate their antimicrobial and antioxidant activities. Methods: LCMS/MS analysis used to identify the compounds. Agar well diffusion and DPPH assays were used to evaluate the antimicrobial and antioxidant activities. Results: Chemical screening reported alkaloids, terpenoids, steroids, and saponins from all investigated sponges. The LC-MS/MS analysis identified various compounds which mainly contained steroids. Antimicrobial activity (against Bacillus subtilis, Escherichia coli, Salmonella enterica, and Candida albicans) was only shown by the Xestospongia sp. extract. Meanwhile, extracts of M. sarasinorum, Xestospongia sp., and Callyspongia sp. exhibited potent radical scavenging activity. Conclusion: The study concluded that the selected sponges could provide various groups of compounds. Methanol extracts of these sponges could be used as sources of antimicrobial and antioxidant agents.

scholarly journals Modifications on the Tetrahydroquinoline Scaffold Targeting a Phenylalanine Cluster on GPER as Antiproliferative Compounds against Renal, Liver and Pancreatic Cancer Cells

2021 ◽  
Vol 14 (1) ◽  
pp. 49
Author(s):  
David Méndez-Luna ◽  
Loreley Araceli Morelos-Garnica ◽  
Juan Benjamín García-Vázquez ◽  
Martiniano Bello ◽  
Itzia Irene Padilla-Martínez ◽  
...  
Keyword(s):  
Binding Site ◽  
Cell Lines ◽  
Cancer Cell ◽  
Inhibitory Activity ◽  
In Silico ◽  
Cancer Cell Lines ◽  
Pancreatic Cancer Cells ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
New Compounds

The implementation of chemo- and bioinformatics tools is a crucial step in the design of structure-based drugs, enabling the identification of more specific and effective molecules against cancer without side effects. In this study, three new compounds were designed and synthesized with suitable absorption, distribution, metabolism, excretion and toxicity (ADME-tox) properties and high affinity for the G protein-coupled estrogen receptor (GPER) binding site by in silico methods, which correlated with the growth inhibitory activity tested in a cluster of cancer cell lines. Docking and molecular dynamics (MD) simulations accompanied by a molecular mechanics/generalized Born surface area (MMGBSA) approach yielded the binding modes and energetic features of the proposed compounds on GPER. These in silico studies showed that the compounds reached the GPER binding site, establishing interactions with a phenylalanine cluster (F206, F208 and F278) required for GPER molecular recognition of its agonist and antagonist ligands. Finally, a 3-(4,5-dimethylthiazol-2-yl)2,5-diphenyltetrazolium bromide (MTT) assay showed growth inhibitory activity of compounds 4, 5 and 7 in three different cancer cell lines—MIA Paca-2, RCC4-VA and Hep G2—at micromolar concentrations. These new molecules with specific chemical modifications of the GPER pharmacophore open up the possibility of generating new compounds capable of reaching the GPER binding site with potential growth inhibitory activities against nonconventional GPER cell models.

scholarly journals Antiglycation and Antioxidant Properties of Ficus deltoidea Varieties

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Nur Sumirah Mohd Dom ◽  
Nurshieren Yahaya ◽  
Zainah Adam ◽  
Nik Mohd Afizan Nik Abd. Rahman ◽  
Muhajir Hamid
Keyword(s):  
Antioxidant Activity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Protein Carbonyl ◽  
Scavenging Activity ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Ficus Deltoidea ◽  
Dpph Radical Scavenging

The present study aimed to evaluate the potential of standardized methanolic extracts from seven Ficus deltoidea varieties in inhibiting the formation of AGEs, protein oxidation, and their antioxidant effects. The antiglycation activity was analyzed based on the inhibition of AGEs, fructosamine, and thiol groups level followed by the inhibition of protein carbonyl formation. The antioxidant activity (DPPH radical scavenging activity and reducing power assay) and total phenolic contents were evaluated. After 28 days of induction, all varieties of Ficus deltoidea extracts significantly restrained the formation of fluorescence AGEs by 4.55–5.14 fold. The extracts also reduced the fructosamine levels by 47.0–86.5%, increased the thiol group levels by 64.3–83.7%, and inhibited the formation of protein carbonyl by 1.36–1.76 fold. DPPH radical scavenging activity showed an IC50 value of 66.81–288.04 μg/ml and reducing power activity depicted at 0.02–0.24 μg/ml. The extent of phenolic compounds present in the extracts ranged from 70.90 to 299.78 mg·GAE/g. Apart from that, correlation studies between the activities were observed. This study revealed that seven varieties of Ficus deltoidea have the potential to inhibit AGEs formation and possess antioxidant activity that might be attributed to the presence of phenolic compounds.

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