scholarly journals Biflavonoids from the Unripe Fruits of Clusia Paralicola and their Antioxidant Activity

2012 ◽  
Vol 7 (12) ◽  
pp. 1934578X1200701 ◽  
Author(s):  
Rafaela Ferreira Oliveira ◽  
Celso Amorim Camara ◽  
Maria de Fátima Agra ◽  
Tania Maria Sarmento Silva
Keyword(s):  
Antioxidant Activity ◽  
Linoleic Acid ◽  
Spectral Data ◽  
2D Nmr ◽  
Cd Spectra ◽  
Total Extract ◽  
Isolation And Characterization ◽  
Β Carotene ◽  
Unripe Fruits

Investigation of the green fruits of Clusia paralicola (Clusiaceae) led to the isolation and characterization of two 3,8″-biflavonoids, 2R, 3S, 2″R, 3″R-GB1-7″- O-β-glucoside (1) and 2R, 3S, 2″R, 3,8″-binaringenin-7″-O-β-glucoside (2), together with four known compounds: β-sitosterol, stigmasterol, β-amyrin, and epicatechin. The structures were established from the IR, LC-ESI-MS and NMR spectral data, including 2D-NMR experiments. The absolute configurations of 1 and 2 were determined by CD spectra. The total extract and the biflavonoids demonstrated significant antioxidant activity in DPPH, ABTS, and β-carotene/linoleic acid tests.

scholarly journals Composition and Antioxidant Activity of Geopropolis Collected byMelipona subnitida(Jandaíra) Bees

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Silvana Alves de Souza ◽  
Celso Amorim Camara ◽  
Eva Monica Sarmento da Silva ◽  
Tania Maria Sarmento Silva
Keyword(s):  
Antioxidant Activity ◽  
Linoleic Acid ◽  
Spectral Data ◽  
2D Nmr ◽  
Stingless Bee ◽  
Esi Ms ◽  
Melipona Subnitida ◽  
Isolation And Characterization

An investigation of the geopropolis collected byMelipona subnitida(jandaíra) stingless bee led to the isolation and characterization of two phenylpropanoids, 6-O-p-coumaroyl-D-galactopyranose (1) and 6-O-cinnamoyl-1-O-p-coumaroyl-β-D-glucopyranose (2), and seven flavonoids, 7-O-methyl-naringenin (3), 7-O-methyl aromadendrin (4), 7,4′-di-O-methyl aromadendrin (5), 4′-O-methyl kaempferol (6), 3-O-methyl quercetin (7), 5-O-methyl aromadendrin (8), and 5-O-methyl kaempferol (9). The structure of the new phenylpropanoid (1) was established from IR, LC-ESI-MS, and NMR spectral data, including 2D NMR experiments. The extract and fractions demonstrated significant antioxidant activity in DPPH, ABTS, andβ-carotene/linoleic acid tests.

Undescribed C-Glycosylflavones from Corn Silk and Potential Anti-inflammatory Activity Evaluation of Isolates

Planta Medica ◽  
2021 ◽  
Author(s):  
Satish Sarfare ◽  
Shabana Iqrar Khan ◽  
fazila zulfiqar ◽  
Srivedavyasasri Radhakrishnan ◽  
Zulfiqar Ali ◽  
...  
Keyword(s):  
Spectral Data ◽  
Structure Elucidation ◽  
2D Nmr ◽  
Inflammatory Activity ◽  
Inos Activity ◽  
Corn Silk ◽  
Activity Evaluation ◽  
Isolation And Characterization ◽  
Phytochemical Investigation

Phytochemical investigation of corn silk resulted in isolation and characterization of four flavone C-glycosides, chrysoeriol 6-C-β-oliopyranosyl-7-O-β-D-glucopyranoside (1), 3′-methoxycassiaoccidentalin A (2), chrysoeriol 6-C-β-boivinopyranosyl-7-O-β-D-glucopyranoside (3), and ax-4"-OH-3′-methoxymaysin (4), a triterpenoid, friedelin (5), two sterols, (22E)-5,8-epidioxyergosta-6,22-dien-3β-ol (6) and 6β-hydroxystigmasta-4,22-diene-3-one (7), and a mixture of β-sitosterol and stigmasterol. Compounds 1 and 2 were previously undescribed. Structure elucidation of the isolated compounds was attained using spectral data including 1D and 2D NMR and HRESIMS. Compounds 1, 2, 5, and 6 inhibited iNOS activity in LPS-induced macrophages and decreased nitrite levels by 68.64+4.46, 65.67 + 6.47, 88.50 + 0.50, and 94.00 + 4.00 %, respectively, at 50 µM. Compound 5 also showed inhibition of NF-κB (51.00+1.50 %). Compounds 1 and 2 induced NAG-1 activity in chondrocytes by 1.80 + 0.05 and 2.00 + 0.13 fold, respectively. The extract of corn silk, however, did not exhibit inhibition of iNOS or NF-κB but induced NAG-1 by 1.80+ 0.51 fold.

In Vitro Antioxidant Activity Metaplexis Japonica Makino Extract and Derivatives

2014 ◽  
Vol 955-959 ◽  
pp. 387-389 ◽  
Author(s):  
Bao Qing Wang
Keyword(s):  
Antioxidant Activity ◽  
Linoleic Acid ◽  
Ethyl Acetate ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Acid Test ◽  
Acetone Extracts ◽  
Β Carotene ◽  
Ethyl Acetate Extracts

Antioxidant activities of acetone and ethyl acetate extracts from Metaplexis japonica Makino, one of famous medicine plants in the eastnorth region of China, named luomo in Chinese, were examined by a DPPH (1,1-Diphenyl-2-picrylhydrazyl) radical-scavenging assay and a β-carotene-linoleic acid test. In DPPH, the antioxidant activity of the acetone extracts, ethyl acetate extracts and derivative were IC50 were 313.21, 266.92 and 118.78μg/mL, respectively. In the β-carotene-linoleic acid test, IC50 were 285.09, 351.57 and 123.89μg/mL. It was concluded that Metaplexis japonica Makino and its derivatives might be a potential natural source of antioxidants .

Isolation and characterization of cDNAs encoding β-carotene hydroxylase in Citrus

Plant Science ◽  
2001 ◽  
Vol 161 (5) ◽  
pp. 1005-1010 ◽  
Author(s):  
In-Jung Kim ◽  
Kyong-Cheol Ko ◽  
Chan-Shick Kim ◽  
Won-Il Chung
Keyword(s):  
Isolation And Characterization ◽  
Β Carotene

scholarly journals Isolation and Characterization of Crotosparsamide, a New Cyclic Nonapeptide from Croton sparsiflorus

2010 ◽  
Vol 5 (12) ◽  
pp. 1934578X1000501 ◽  
Author(s):  
Rashad Mehmood ◽  
Abdul Malik
Keyword(s):  
Spectroscopic Data ◽  
2D Nmr ◽  
Spectral Studies ◽  
Isolation And Characterization ◽  
First Time

Crotosparsamide (1), a new cyclic nonapeptide, has been isolated from the n-butanol soluble sub-fraction of Croton sparsiflorus along with p-hydroxy methylcinnamate and kaempferol, which are reported for the first time from this species. Their structures were determined by chemical and spectral studies including ESIMS, and 1D and 2D NMR spectroscopic data.

scholarly journals Isolation and Characterization of Two New Antimicrobial Acids from Quercus incana (Bluejack Oak)

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Rizwana Sarwar ◽  
Umar Farooq ◽  
Sadia Naz ◽  
Nadia Riaz ◽  
Syed Majid Bukhari ◽  
...  
Keyword(s):  
Ethyl Acetate Fraction ◽  
Structural Formula ◽  
2D Nmr ◽  
Spectroscopic Technique ◽  
Pentanoic Acid ◽  
One Dimensional ◽  
Isolation And Characterization ◽  
Nmr Techniques ◽  
New Compounds

Two new compounds [1-2] were purified from ethyl acetate fraction of Quercus incana. The structure of these compounds is mainly established by using advanced spectroscopic technique such as UV, IR, one-dimensional (ID) and two-dimensional (2D) NMR techniques, and EI mass. The structural formula was deduced to be 4-hydroxydecanoic acid [1] and 4-hydroxy-3-(hydroxymethyl) pentanoic acid [2]. Both isolated compounds were tested for their antimicrobial potential and showed promising antifungal activity against Aspergillus niger and Aspergillus flavus.

Identification, isolation and characterization of epidermal lipids containing linoleic acid

1985 ◽  
Vol 834 (3) ◽  
pp. 419-428 ◽  
Author(s):  
P.A. Bowser ◽  
D.H. Nugteren ◽  
R.J. White ◽  
U.M.T. Houtsmuller ◽  
C. Prottey
Keyword(s):  
Linoleic Acid ◽  
Epidermal Lipids ◽  
Isolation And Characterization

Incorporation of Cornus mas L. in Soybean Oil: Evaluation of Phytochemical and Antioxidant Activity

2020 ◽  
Vol 16 (3) ◽  
pp. 397-402 ◽  
Author(s):  
Nabi Shariatifar ◽  
Massoud Amanlou ◽  
Ramin Rahimnia ◽  
Shabnam Mahernia ◽  
Amin M. Khaneghah
Keyword(s):  
Antioxidant Activity ◽  
Linoleic Acid ◽  
Soybean Oil ◽  
Antioxidant Activities ◽  
Beta Carotene ◽  
Dpph Assay ◽  
Synthetic Antioxidant ◽  
Cornus Mas ◽  
Peroxide Values ◽  
Β Carotene

Background: The active compounds of Cornus mas L. were extracted by the aid of water and ethanol and were incorporated into soybean oil samples. Afterward, their antioxidant activities were examined. Methods: The 1, 1 diphenyl-2- picrylhydrazyl (DPPH) and beta-carotene methods were approached in order to assess the antioxidant capacity. Different concentrations of extracts prepared (0,200, 400 and 800 mg/lit) and β hydroxyl toluene (BHT, 100 mg/lit) were added into soybean oil, and the resulted mixtures were incubated for 35 days at 65°C. Peroxide values (PVs) and thiobarbituric acidreactive substances (TBARs) levels were measured each week during the incubation. The collected data from each incubation was analyzed using ANOVA test. Results: Results demonstrated that corresponded values for β-carotene-linoleic acid and DPPH assay of the Cornus mas L. extracted by ethanol and water were lower than synthetic antioxidant and BHT. Conclusion: PVs and TBARs levels of soybean oil during the incubation time was decreased by the incorporation of extracts (water and ethanol) of Cornus mas L. while compared to the control.

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