scholarly journals Changes of Major Antioxidant Compounds and Radical Scavenging Activity of Palm Oil and Rice Bran Oil during Deep-Frying

Antioxidants ◽  
2014 ◽  
Vol 3 (3) ◽  
pp. 502-515 ◽  
Author(s):  
Azizah Hamid ◽  
Mohd Dek ◽  
Chin Tan ◽  
Mohd Zainudin ◽  
Evelyn Fang
Keyword(s):  
Rice Bran ◽  
Palm Oil ◽  
Rice Bran Oil ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Antioxidant Compounds ◽  
Deep Frying ◽  
Scavenging Activity

Total Phenolic Content and DPPH Free Radical Scavenging Activity of Young Turmeric Grown in Southern Thailand

2019 ◽  
Vol 886 ◽  
pp. 61-69
Author(s):  
Suriyan Sukati ◽  
Warachate Khobjai
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Content ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Total Phenolic ◽  
Antioxidant Compounds ◽  
Scavenging Activity ◽  
Methanolic Extracts ◽  
Southern Thailand

Turmeric (Curcuma longa L.), a member of Zingiberacaeae, is used for Thai traditional medicine, flavoring, preservative, and coloring agent. In Southern Thailand, turmeric is a famous ingredient for food recipes. Not only is the ripened rhizome used for cuisine, but also the young rhizomes. Previous studies have indicated that a variety of turmeric products from the ripened rhizome are valuable source of antioxidant compounds. However, there are ambiguous data regarding the level of antioxidant activity of the young rhizome. The aim of this study was to investigate the level of total phenolic content (TPC) and antioxidant activity of the young rhizomes by comparing to the ripened rhizome. TPC and antioxidant activity of aqueous and 80% methanolic extracts from the young turmeric grown in Southern Thailand were estimated using the Folin-Ciocalteu method and DPPH free radical scavenging activity (DPPH-RSA) assay, respectively. Results showed that the concentration of TPC determined in methanolic extract (19.80±0.25 mg GAE/ g extract) from the young rhizome was significantly higher than the corresponding aqueous extract (18.38±0.41 mg GAE/ g extract). The aqueous and methanolic extracts exhibited significant inhibition in DPPH-RSA with the half-maximal inhibitory concentration (IC50) value of 5.88±0.70 mg/mL and 3.00±0.31 mg/mL, respectively. However, in comparison with the ripened rhizome, TPC and DPPH-RSA of the young rhizome were lower. These results indicate that the young rhizome grown in Southern Thailand could be a source of antioxidant compounds, but the ripened rhizome provides better antioxidant properties than the young rhizome.

Non-Phenolic Antioxidant Compounds from Buddleja asiatica

2008 ◽  
Vol 63 (7-8) ◽  
pp. 483-491 ◽  
Author(s):  
Mortada M. El-Sayed ◽  
El-Sayed S. Abdel-Hameed ◽  
Wafaa S. Ahmed ◽  
Eman A. El-Wakil
Keyword(s):  
Methanol Extract ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Antioxidant Compounds ◽  
Scavenging Activity ◽  
Chemical Analyses ◽  
Dpph Assay ◽  
Antioxidant Agents ◽  
Total Antioxidant

The methanol extract of the leaves of Buddleja asiatica Lour. (Loganiaceae) showed antioxidant activity toward the well known in vitro antioxidant tests such as total antioxidant capacity by the phosphomolybdenum method, free radical scavenging activity by the 1,1- diphenyl-2-picrylhydrazyl scavenging assay (DPPH assay) and hydrogen peroxide scavenging methods. Due to the high scavenging activity of the n-butanol successive fraction toward DPPH and H2O2 (SC50 = 11.99 and 18.54 μg/ml, respectively), this extract was subjected to chromatographic separation and isolation. Four non-phenolic compounds were isolated and identified on the basis of spectroscopic and chemical analyses: 1-O-ß-D-glucopyranosyl- 2-methoxy-3-(2-hydroxy-triaconta-3,12-dienoate)-glycerol (1), 3-O-[α-l-rhamnopyranosyl- (1→4)-ß-d-glucopyranosyl-(1→3)]-[ß-d-glucopyranosyl-(1→2)]-ß-d-fucopyranosyl-olean- 11,13(18)-diene-3ß,23,28-triol (2), 3-O-[α-l-rhamnopyranosyl-(1→4)-ß-d-glucopyranosyl- (1→4)-ß-d-glucopyranosyl-(1→3)]-ß-d-fucopyranosyl-olean-11,13(18)-diene-3ß,23,28-triol (3), and 3-O-[α-l-rhamnopyranosyl-(1→4)-ß-d-glucopyranosyl-(1→3)]-[ß-d-xylopyranosyl- (1→2)]-ß-d-glucuronopyranosyl-acid-olean-11,13(18)-diene-3ß,23,28-triol (4). The four compounds were evaluated as antioxidant agents using the three antioxidant bioassay tests.

scholarly journals Kinetic behaviour of DPPH radical scavenging activity of tomato waste extracts

2012 ◽  
Vol 77 (10) ◽  
pp. 1381-1389 ◽  
Author(s):  
Sladjana Savatovic ◽  
Gordana Cetkovic ◽  
Jasna Canadanovic-Brunet ◽  
Sonja Djilas
Keyword(s):  
Steady State ◽  
Caffeic Acid ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Antioxidant Compounds ◽  
Scavenging Activity ◽  
Kinetic Behaviour ◽  
Tomato Waste ◽  
Dpph Radical Scavenging ◽  
Slow Kinetic

The kinetic behaviour of tomato waste extracts (obtained from six genotypes) and standard antioxidant compounds (ascorbic and caffeic acid) were investigated using 2,2-diphenyl-1-picrylhydrazyl radical test. Based on the time needed for the reaction to reach steady state, the investigated extracts show very slow (steady state ? 180 min) antiradical behaviour, ascorbic acid act as rapid antioxidant (steady state < 5min) while caffeic acid is rapidintermediate antioxidant (5 min < steady state < 20 min). The efficient concentrations at different kinetic times EC50,t were determined for all extracts, ascorbic and caffeic acid. EC50,t was used as a parameter to screen and compare antiradical activities of food extracts with slow kinetic action. Irrespective of the time considered, the comparison of the EC50,t for extracts showed that the DPPH radicals scavenging activity of extracts decreased in the order of O2 > Knjaz > Backa > Saint Pierre > Rutgers > Novosadski niski. Tomato waste extracts showed very slow kinetic action, which is probably result of the different kinetic bevaviour of phenolic compounds, present in tomato waste, as well as other antioxidants (vitamins, carotenoids etc).

scholarly journals A novel antioxidant: 6,6'-(butane-1,1-diyl)bis(4-methylbenzene-1,2-diol)

2018 ◽  
Vol 69 (3) ◽  
pp. 269 ◽  
Author(s):  
T. M. Olajide ◽  
H. Pasdar ◽  
X. C. Weng
Keyword(s):  
Radical Scavenging Activity ◽  
Condensation Reaction ◽  
Radical Scavenging ◽  
Deep Frying ◽  
Scavenging Activity ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Relative Ease ◽  
Acid Catalyzed ◽  
Dpph Radical Scavenging

A novel compound, 6,6'-(butane-1,1-diyl)bis(4-methylbenzene-1,2-diol) (BMB), was synthesized through an acid-catalyzed condensation reaction between 4-methylcatechol (HPC) and butyraldehyde. When evaluated by the Rancimat and deep frying methods, BMB exhibited a stronger antioxidant activity than TBHQ. Its DPPH radical scavenging activity was also fairly higher than TBHQ, but lower compared to its mother phenol, HPC, due to its relative ease of binding DPPH•. BMB had the strongest scavenging ability of the 4-methylcatechol analogues reported to date. It could be used effectively to retard lipid peroxidation in both moderate and high temperature food preparations.

Qualitative Phytochemical Analysis in Determination of Antioxidant Activity of Methanolic Extract of Oenothera biennis by GCMS – A Preliminary Research Study

2021 ◽  
pp. 3744-3750
Author(s):  
Afroz Patan ◽  
Saranya M. ◽  
Vignesh S. ◽  
Bharathi A. ◽  
Vikram G. ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Plant Extract ◽  
Radical Scavenging Activity ◽  
Research Work ◽  
Radical Scavenging ◽  
Antioxidant Compounds ◽  
Phytochemical Analysis ◽  
Scavenging Activity ◽  
Compound Identification ◽  
Oenothera Biennis

Introduction and Aim: Oenothera biennis an important medicinal plant which belongs to Onagraceae family. It is used for various medicinal purposes in ayurvedic medicine and herbal remedy. The aim of the present study was to evaluate the antioxidant activity of phenol and flavonoid extract of plant of O. biennis and GC-MS analysis for active compound identification. Materials and Methods: Radical scavenging assay and reduction assay methods were used for antioxidant activity. The antioxidant capacity of methanolic plant extractHP-5 column was used for GCMS analysis. Results: The IC50 of DPPH radical scavenging activity of methanol leaves extract of O. biennis was 31.43µg/mL concentration, IC50value of superoxide radical scavenging activity was 37.71µg/mL concentration. The RC50 of phosphomolybdenum reduction of methanolic plant extract of O. biennis was 49.90µg/mL concentration and the RC50of Fe3+ reduction was 37.25µg/mL concentrations. Antioxidant compounds such as Phenol, 2, 6-bis(1,1-dimethyl)-4-[(4-hydroxy-3,5-dimethylphenyl)methyl]-, Cromaril and Oleic acid were eluted by GCMS analysis. Conclusion: The data showed that the methanolic plant extract of O. biennis has significant antioxidant activity. The flavone compounds identified in GCMS could be responsible for antioxidant activity. Further research work needed to isolate active compounds to kill diseases.

scholarly journals Synthesis of Amino Acid Analogues of 5H-Dibenz[b,f]azepine and Evaluation of their Radical Scavenging Activity

2009 ◽  
Vol 6 (1) ◽  
pp. 125-132 ◽  
Author(s):  
H. Vijay Kumar ◽  
C. R. Gnanendra ◽  
Nagaraja Naik
Keyword(s):  
Free Radical ◽  
Amino Acid ◽  
Free Amino Acid ◽  
Free Amino ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Antioxidant Compounds ◽  
Scavenging Activity ◽  
Hydroxy Proline ◽  
Amino Acid Analogues

A method for the synthesis of tyrosine, phenyl alanine, hydroxy proline and threonine free amino acid analogues of 5H-dibenz[b,f]azepine is proposed. 5H-dibenz[b,f]azepine was prepared by known method. The key intermediate 3-chloro-1-(5H-dibenz[b,f]azepine-5-yl)propan-1-one was obtained byN-acylation of 5H-dibenz[b,f]azepine with 3-chloro propionyl chloride. Further coupling of respective free amino acid to produce 2-(3-(5H-dibenz[b,f]azepine-5-yl)-3-oxopropylamino)3-(4 hydroxyphenyl) propanoic acid, 2-(3-(5H-dibenz[b,f]azepine-5-yl)-3-oxopropylamino)-3-phenyl propanoicacid,1-(3-(5H-dibenz[b,f]azepine-5-yl)-3-oxopropyl)-3-hydroxypyrolidine-2-carboxylic acid and 2-(3-(5H-dibenz[b,f] azepine-yl)-3-oxopropyl amino)-3-hydroxy butanoic acid. The synthesized compounds were evaluated for their potential over 1,1-diphenyl-2-picryl hydrazyl (DPPH) free radical scavenging activity. Butylated hydroxy anisole (BHA) and ascorbic acid (AA) were used as the reference antioxidant compounds and also the comparative study with synthesized compounds was done. Under our experimental conditions tyrosine, hydroxy proline and threonine analogues possess a direct scavenging effect on trapping the stable free radical DPPH. Hydroxy proline analogues showed a significant radical scavenging activity among the synthesized analogues

scholarly journals Metabolomic Profiling of Antioxidant Compounds in Five Vachellia Species

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6214
Author(s):  
Garland Kgosi More ◽  
Stephen Meddows-Taylor ◽  
Gerhard Prinsloo
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Proton Nuclear Magnetic Resonance ◽  
Antioxidant Compounds ◽  
Scavenging Activity ◽  
Frap Assay ◽  
Modeling Tools ◽  
Antioxidant Power

The genus Vachellia, previously known as Acacia, belongs to the family Fabaceae, subfamily Leguminosae, which are flowering plants, commonly known as thorn trees. They are traditionally used medicinally in various countries including South Africa for the treatment of ailments such as fever, sore throat, Tuberculosis, convulsions and as sedatives. The aim of this study was to determine biochemical variations in five Vachellia species and correlate their metabolite profiles to antioxidant activity using a chemometric approach. The antioxidant activity of five Vachellia aqueous-methanolic extracts were analyzed using three methods: 2,2-di-phenyl-1-picrylhydrazyl (DPPH) radical scavenging assay, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS+) analysis and the ferric reducing antioxidant power (FRAP) assay by means of serial dilution and bioautography with the thin-layer chromatography (TLC) method. Amongst the Vachellia extracts tested, V. karroo, V. kosiensis and V. xanthophloea demonstrated the highest DPPH, ABTS+ and FRAP inhibitory activity. The antioxidant activities of DPPH were higher than those obtained by ABTS+, although these values varied among the Vachellia species. Proton nuclear magnetic resonance (1H NMR), coupled with multivariate statistical modeling tools such as principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA), were performed to profile metabolites responsible for the observed activity. The OPLS-DA categorized the five Vachellia species, separating them into two groups, with V. karroo, V. kosiensis and V. xanthophloea demonstrating significantly higher radical scavenging activity than V. tortilis and V. sieberiana, which clustered together to form another group with lower radical scavenging activity. Annotation of metabolites was carried out using the ultra-high-performance liquid chromatography–quadrupole time-of-flight mass spectrometry (UHPLC-qTOF-MS), and it tentatively identified 23 metabolites of significance, including epigallocatechin (m/z = 305.0659), methyl gallate (m/z = 183.0294) and quercetin (m/z = 301.0358), amongst others. These results elucidated the metabolites that separated the Vachellia species from each other and demonstrated their possible free radical scavenging activities.

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