Determination of Total Phenolics Contents, Antioxidant Capacity of Thymus vulgaris Extracts using Electrochemical and Spectrophotometric methods

Amamra, Samra

doi:10.20964/2018.08.57

Cited by 24 publications

(12 citation statements)

References 36 publications

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“…Figure 3 shows the plots between antioxidant activity and phenol contents, which displayed a good pattern against TPC, suggesting the dependence of D. latifolia on TPC for effectiveness (3a), while Figure 3b and 3c were resulted in random plots. This relationship is in agreement with several prior studies (Eddebbagh et al 2016;Guedes et al 2017;Amamra et al 2018;Hossain et al 2019).…”

Section: Correlation Between Phenol Contents and Antioxidant Activitysupporting

confidence: 94%

“…The neoflavonoids identified in this research, including latifolin probably does not refer to the total flavonoids measured by the unit of standard, quercetin (Figure 4a). Based on the analysis of regression, the direct correlation against TFC was also weak, which is inconsistent with the previous reports by Eddebbagh et al (2016) and Amamra et al (2018), although in agreement with the study by Ghasemi et al (2009) on peels and tissues of 13 citrus species.…”

Section: Correlation Between Phenol Contents and Antioxidant Activitycontrasting

confidence: 79%

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Phenol Contents and Antioxidant Activity of Sonokeling (Dalbergia latifolia Roxb) Wood

et al. 2020

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Dalbergia latifolia or sonokeling is a native species of Java, Indonesia, used as an important wood for furniture and building materials, due to the high of durability and beautiful color. This study, therefore, aim to investigate the phenol composition, represented by total phenolic, flavonoid, and flavanol content, as well as antioxidant activity, conducted by DPPH (1, 1-diphenyl-2-picrylhydrazyl) method on Dalbergia latifolia wood. The sample was extracted using ethanol-toluene solvent in a Soxhlet apparatus, and subsequently subjected to column chromatography. This treatment yielded 12 fractions, which were then evaluated for phenol contents and antioxidant activity. The results showed a high antioxidant activity and total phenolic content in Fr.1- Fr.3, while latifolin was detected and characterized by GC-MS and a literature comparison. Therefore, it was established that the antioxidant activity of D. latifolia wood extractives properly correlated with the total phenolic, but not with the total flavonoid and flavanol contents.

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Section: Correlation Between Phenol Contents and Antioxidant Activitysupporting

confidence: 94%

Section: Correlation Between Phenol Contents and Antioxidant Activitycontrasting

confidence: 79%

Phenol Contents and Antioxidant Activity of Sonokeling (Dalbergia latifolia Roxb) Wood

et al. 2020

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“…Our TFC values as quercetin equivalents are in the range of 13.56–25.03 mg QE /g extract for So extracts, slightly lower than that reported by Duletic et al (27.30 ± 8.48 mg QE /g extract) [ 45 ]. Amamra et al reported lower TFC values for methanolic extracts of Ts (21.92 ± 1.14 mg QE /g extract) in comparison with our ethanolic and ethanol–water extracts (26.93–27.54 mg QE /g extract) [ 46 ].…”

Section: Resultsmentioning

confidence: 62%

Properties of Salvia officinalis L. and Thymus serpyllum L. Extracts Free and Embedded into Mesopores of Silica and Titania Nanomaterials

et al. 2020

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This study evidenced the nanoconfinement effect on polyphenolic extracts prepared from Salvia officinalis L. and Thymus serpyllum L. into the mesopores of silica and titania nanomaterials on their radical scavenging capacity and antimicrobial potential. The ethanolic and hydroalcoholic extracts obtained either by conventional or microwave-assisted extraction were characterized in terms of total polyphenols, total flavonoids, and chlorophyll content, as well as radical scavenging activity by consecrated spectrometric determinations. The phytochemical fingerprint of extracts was analyzed by high-performance liquid chromatography-photodiode array detector. Salvia officinalis extracts exhibited better radical scavenging capacity and antimicrobial potential than Thymus serpyllum extracts. The mesoporous MCM-41 silica and titania nanomaterials, prepared by the sol–gel method, were characterized by small- and wide-angle powder diffraction, FTIR spectroscopy, nitrogen adsorption–desorption isotherms, scanning electron microscopy and transmission electron microscopy, while the materials containing embedded extracts were analyzed through Fourier-transform infrared spectroscopy, N2 sorption measurements, and thermal analysis. All extracts free and embedded in mesoporous matrix exhibited high radical scavenger properties and good bactericidal activity against several reference strains. It was proved that by embedding the polyphenolic extracts into mesopores of silica or titania nanoparticles, the phytochemicals stability was enhanced as the materials containing extract exhibited higher radical scavenger activity after 3–6 months storage than that of the free extracts. Additionally, the extract-loaded material showed mild improved antimicrobial activity in comparison with the corresponding free extract.

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“…The ferrous ion chelating ability (FIC) was determined according to the method of Amamra et al (2018), with some modifications. Instead of methanol, distilled water was used to dissolve the ferrozine.…”

Section: Antioxidant Activity Evaluation Methodsmentioning

confidence: 99%

Antioxidant activity and polyphenol content in extracts from various parts of fresh and frozen mangosteen

Muzykiewicz

Zielonka-Brzezicka

Siemak

et al. 2020

Acta Sci Pol Technol Aliment

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Background. The search for new sources of natural antioxidants is very important because many diseases are caused by oxidative stress. Fruit which contain antioxidants are an important part of a healthy diet. The aim of this study was to evaluate the antioxidant activity of extracts of both the fresh and frozen peel and the flesh of Garcinia mangostana L. Materials and methods. The extracts from the fresh and frozen peel and the flesh of mangosteen were prepared by ultrasound-assisted extraction using 20%, 40%, 70% and 96% (v/v) ethanol for 15, 30 or 60 minutes. The antioxidant potential was evaluated by the DPPH, ABTS, CUPRAC, FRAP and FIC methods, whereas the total phenolic content was measured using the Folin-Ciocalteu (F-C) technique. The contents of anthocyanins and flavonoids in the peel extracts were also determined. Results. In most cases, the highest antioxidant activity was observed in the fresh peel samples. It was higher than the antioxidant potential of the frozen peels and the fresh and frozen flesh. The ultrasound-assisted extraction, in particular those lasting 30 or 60 minutes and using ethanol in concentrations higher than 20% (v/v), seemed to be an effective extraction process. Conclusion. The obtained results suggest that G. mangostana, in particular its peels, could be a valuable source of antioxidants. The extraction parameters, such as the time or solvent concentration, as well as the type of plant material, had an impact on the tested properties of the extracts. However, more detailed studies on the antioxidant activity of the studied plants are required.

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Determination of Total Phenolics Contents, Antioxidant Capacity of Thymus vulgaris Extracts using Electrochemical and Spectrophotometric methods

Cited by 24 publications

References 36 publications

Phenol Contents and Antioxidant Activity of Sonokeling (Dalbergia latifolia Roxb) Wood

Phenol Contents and Antioxidant Activity of Sonokeling (Dalbergia latifolia Roxb) Wood

Properties of Salvia officinalis L. and Thymus serpyllum L. Extracts Free and Embedded into Mesopores of Silica and Titania Nanomaterials

Antioxidant activity and polyphenol content in extracts from various parts of fresh and frozen mangosteen

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