scholarly journals Comparison of Iron Reduction Methods on the Determination of Antioxidants Content in Vegetables Sample

2018 ◽  
Vol 34 (5) ◽  
pp. 2418-2424
Author(s):  
Yefrida Yefrida ◽  
Hamzar Suyani ◽  
Hermansyah Aziz ◽  
Mai Efdi

Determination of antioxidant content in 14 vegetables has been done using Modified Phenanthroline (MPM), Phenanthroline (PM) and Ferric Reducing Antioxidant Power (FRAP) methods. The SDR values ​​obtained for the MPM and PM methods were (2.65 ± 1.26) % and (3.51 ± 0.88) %, while the recovery values ​​were (100.86 ± 4.45)% and (99.93 ± 3.50) %, respectively. The antioxidant content of vegetables obtained by MPM, PM and FRAP methods were (30.4 ± 1.46 - 515.9 ± 3.32), (25.9 ± 1.13 - 327.3 ± 2.57) and (21.4 ± 0.51 - 371.7 ± 1.10) μmol Fe / g DW, respectively. The antioxidant content obtained with the three methods showed no significant different. The correlation values ​​between MPM - PM, MPM - FRAP, and PM - FRAP methods are 0.9712, 0.9896 and 0.9611, respectively. These values indicate a very strong correlation among the three methods.

2010 ◽  
Vol 5 (3) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Rasyidah Razab ◽  
Azlina Abdul Aziz

Plants that contain high amounts of polyphenolic compounds are potential candidates for natural antioxidant sources. Studies are on going in the search for new sources of antioxidants. Not much data are available on the antioxidant capacity of tropical herbs. With this in mind, 19 commonly consumed Malaysian herbs were analyzed for their polyphenolic content and antioxidant activities. A majority of these plants have never been studied before with regards to their polyphenolic content and antioxidant activities. The shoots of Anacardium occidentale, the shoots and fruits of Barringtonia racemosa, Pithecellobium jiringa and Parkia speciosa had high polyphenolic contents (> 150 μg gallic acid equivalents/mg dried plant) and antioxidant activities when measured using the ferric reducing antioxidant power (FRAP) (>1.2 mM) and Trolox equivalent antioxidant capacity (TEAC) assays (>2.4 mM). A strong correlation was observed between the two antioxidant assays (FRAP vs TEAC) implying that the plants could both scavenge free radicals and reduce oxidants. There was also a strong correlation between the antioxidant activities and polyphenolic content suggesting the observed antioxidant activities were contributed mainly by the polyphenolics in the plants.


Antioxidants ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 297 ◽  
Author(s):  
Khiena Brainina ◽  
Natalia Stozhko ◽  
Marina Vidrevich

Unreliable terminology and incompatible units of antioxidant activity/concentration expression lead to the failure of antioxidant clinical trials, ambiguity of conclusions about the effect of a chosen therapy in medicine and evaluation of food quality, diet, difficulties using information in monitoring the training process in sports, etc. Many different terms (antiradical activity, antioxidant activity, antioxidant capacity, antioxidant power, antioxidant ability) and methods: Trolox equivalent capacity assay (TEAC), Ferric Reducing Antioxidant Power assay (FRAP), Cupric Reducing Antioxidant Capacity assay (CUPRAC), antioxidative activity assay (ABTS), the oxygen radical absorbance capacity (ORAC), and different options of electrochemical ones) proposed for the determination of antioxidants are described. Possible approaches to the development of this field of science and practice are considered.


2012 ◽  
Vol 95 (6) ◽  
pp. 1725-1732 ◽  
Author(s):  
Yong Seo Park ◽  
Buk-Gu Heo ◽  
Kyung-Sik Ham ◽  
Seong-Gook Kang ◽  
Yang-Kyun Park ◽  
...  

Abstract The aim of this investigation was to determine the bioactive compounds in kiwifruit as an indication of quality after extraction using methanol and ethyl acetate. Using FTIR and three-dimensional fluorescence spectroscopy and electrospray ionization/MS, the contents of polyphenols, flavonoids, flavanols, and tannins, and the level of the antioxidant activity by 2, 2-azino-bis (3-ethyl-benzothiazoline-6-sulfonic acid) diammonium salt, 1, 1-diphenyl-2-picrylhydrazyl, ferric-reducing/antioxidant power, and cupric reducing antioxidant capacity assays were determined and compared. It was found that the methanol extracts of kiwifruit showed significantly higher amounts of bioactive compounds and antioxidant activities than the ethyl acetate extracts. The cultivar Bidan, in comparison with the classic Hayward, showed significantly higher bioactivity. For the first time, Bidan organic kiwifruit was analyzed for its antioxidant activities and compared with the widely consumed Hayward organic based on its bioactive compounds and fluorescence properties. Relatively high content of bioactive compounds and positive antioxidant and antiproliferative properties of kiwifruit determined by the advanced analytical methods justify its use as a source of valuable antioxidants. The methods used are applicable for bioactivity determination, in general, for any food products.


2020 ◽  
Vol 11 (1) ◽  
pp. 24-34
Author(s):  
Yefrida Yefrida ◽  
Hamzar Suyani ◽  
Hermansyah Aziz ◽  
Mai Efdi

The Modified Phenanthroline Method (MPM) has been validated for determination of antioxidant content in herb samples. Validation was done using Relative Standard Deviation (RSD) and percentage of recovery. The RSD and percentage of recovery for herb samples are 3.13% and 98.6%, respectively. Based on these values, MPM method is valid for determining antioxidant content in herb samples. T test shows no significant differences of antioxidant content using any of these methods, MPM, PM, FRAP or DPPH, at a 95% confidence level. MPM method shows a very strong correlation with PM and FRAP method.  While with DPPH and TPC shows is strong.


2019 ◽  
Vol 11 (1) ◽  
pp. 09-16
Author(s):  
Epi Supri Wardi ◽  
Zulkarni R Zulkarni R ◽  
Desy Nurdianti

Determination of total phenolate and antioxidant activity of red leaf extract (Erythrina fusca Lour) was done by UV-Vis spectrophotometry. This study aims to determine the total phenolic content and antioxidant activity of hexane, ethyl acetate and ethanol extract. The extracts were prepared using a non-polar-maseration method with hexane, ethyl acetate and ethanol solvents. The results showed total phenolic concentration using the Folin-Ciocalteu method were 0.412 g/100 g in the hexane extract, 1.782 g/100 g in the ethyl acetate extract and 5.455 g/100 g in the ethanol extract. Antioxidant activity conducted by using FRAP method (Ferric Reducing Antioxidant Power) were obtained 0,682 mmol Fe (II)/100 g at hexane extract, 5,186 mmol Fe (II)/100 g at ethyl acetate extract and 10,591 mmol Fe (II)/100 g on the ethanol extract. The antioxidant activity of gallic acid as standard was 44.356 g mmol Fe (II)/100g.


Author(s):  
Bethânia Alves Avelar-Freitas ◽  
Karine Beatriz Costa ◽  
Marcelo Ottoni ◽  
Alyson Torres de Barros ◽  
Patrícia Machado de Oliveira ◽  
...  

Plectranthus neochilus é uma erva aromática conhecida popularmente como boldo-gambá, usada na medicina popular para tratar dispepsia e insuficiência hepática, usada também com efeito analgésico e anti-inflamatório. Tendo em vista o uso popular da planta, torna-se importante a investigação farmacológica dos compostos isolados de P.neochilus. A avaliação da Citotoxicidade em plantas é de extrema importância para posterior utilização em medicamentos. O objetivo deste trabalho é avaliar concentrações não citotóxicas de 1,6-di-O-acetil-9-deoxiforscolina um composto isolado análogo a forscolina oriundo do extrato hidroalcoólico das folhas e caules de P.neochilus e avaliar se este diterpeno possuicapacidade antioxidante. Para o teste de citotoxicidade foi utilizado o ensaio de viabilidade com sangue total, foi feita a coleta de sangue de 5 voluntários hígidos, e confeccionadas 6 culturas, sendo a primeira controle a segunda um controle de DMSO, que foi utilizado como solvente para o diterpeno e 4 culturas em concentrações diferentes do diterpeno, 40, 20, 10 e 5μg/ml, seguiu-se o protocolo de lise de hemácias com cloreto de amônio e marcou-se com azul de tripan, posteriormente, foi feita a leitura por citometria de fluxo. Também foi analisada a capacidadeantioxidante do diterpeno por meio da determinação do poder de redução do íon ferro, FRAP (do inglês Ferric Reducing Antioxidant Power) em que é analisada a produção do íon Fe2+ a partir da redução do íon Fe3+ presente no complexo 2,4,6-tripiridil-s-triazina (TPTZ). Quando o ocorre a redução, há alteração de cor na solução, a avaliação é realizada por espectrofotômetro em comprimento de onda de 593 nm. Os resultados demonstraram que nas concentrações testadas, 40, 20, 10 e 5 μg/ml o diterpeno extraído da planta P. neochilus não apresentou citotoxicidade seletiva a nenhuma população leucocitária avaliada (linfócitos, monócitos e neutrófilos) e ainda apresentou grande capacidadeantioxidante. Mais estudos devem ser realizados evidenciando os potenciais farmacológicos da planta P. neochilus, bem como de substâncias isoladas a partir de extratos da planta.Palavras-chave: Diterepeno. Citotoxidade. antioxidanteAbstractPlectranthus neochilus is an aromatic herb popularly known as boldo- opossum, used in folk medicine to treat dyspepsia and hepatic insufficiency, also used as analgesic and anti-inflammatory. In view of the popular use of the plant, it becomes important the pharmacological investigation of the compounds isolated from P.neochilus. The evaluation of plant cytotoxicity is of extreme importance for subsequent use in medicinal products. The objective of this study is to evaluate non-cytotoxic concentrations of 1,6-di-O-acetyl-9-deoxyphosphine an isolated compound analogous to forskolin from the hydroalcoholic extract of P.neochilus leaves and stems and to evaluate whether this diterpene has antioxidant capacity. For the cytotoxicity test, the whole blood viability assay was performed, blood was collected from 5 healthy volunteers, and 6 cultures were made, the second control being a DMSO control, which is the diterpene solvent and 4 cultures at different concentrations of diterpene, 40, 20, 10 and 5 μg / ml, followed by the protocol of red blood cell lysis with ammonium chloride and labeled with tripan blue, and then read by flow cytometry. The antioxidant capacity of diterpene was also analyzed by means of the determination of the iron ion reductionpower (FRAP) in which Fe2 + ion production is analyzed from the Fe3 + ion present in complex 2, 4,6-tripyridyl-s-triazine (TPTZ). When the reduction occurs there is a color change in the solution, turning to an intense purple, the evaluation is performed by spectrophotometer at wavelength of 593 nm. The results demonstrated that at the tested concentrations, 40, 20, 10 and 5 μg / ml diterpene extracted from the plant P. neochilus did not present selective cytotoxicity to any leukocyte population evaluated (lymphocytes, monocytes and neutrophils) andstill presented a great antioxidant capacity. Further studies should be performed evidencing the pharmacological potentials of the plant P. neochilus, as well as of substances isolated from extracts of the plant.Keywords: Diterpene, cytotoxicity, antioxidant .


2011 ◽  
Vol 416 (2) ◽  
pp. 202-205 ◽  
Author(s):  
William A. Hayes ◽  
Daniel S. Mills ◽  
Rachel F. Neville ◽  
Jenna Kiddie ◽  
Lisa M. Collins

2020 ◽  
Vol 108 (10) ◽  
pp. 829-837
Author(s):  
Serdar Dizman ◽  
Oktay Yildiz ◽  
Gülsüm Merve Boyraci ◽  
Sevgi Kolayli

AbstractThanks to its rich content, propolis has been used to protect the hive from all kinds of external influences and for disinfection by bees. Furthermore, it is an important marker for monitoring environmental pollution because the main sources of propolis are plant and secretions. So, the present study aimed to research radiation attenuation capability and the natural radioactivity level of propolis samples. For this reason, both natural radioactivity concentrations (226Ra, 232Th and 40K) and attenuation coefficients (Linear and Mass) in the propolis samples collected from 10 different points in Turkey were measured using high purity germanium detector (HPGe). The average natural radioactivity concentrations in samples were found to be 0.56 ± 0.19, 2.65 ± 0.31 and 70.08 ± 2.42 Bq/kg for 226Ra, 232Th and 40K, respectively. These values were much lower than the average world values (35 Bq/kg for 226Ra, 30 Bq/kg for 232Th and 400 Bq/kg for 40K) reported by United Nations Scientific Committee on Effects of Atomic Radiation (UNSCEAR) in foodstuff. The average linear attenuation coefficient, mass attenuation coefficients and half value layer values for gamma rays with 59.54 keV energy were determined as 0.1970 cm−1, 0.1831 cm2 g−1 and 3.56 cm, respectively. In addition, antioxidant properties of the samples were measured using total phenolic content and ferric reducing antioxidant power. Their correlations with radioactivity were investigated.


2021 ◽  
Vol 11 (1) ◽  
pp. e6-e6
Author(s):  
Mahmoodreza Moein ◽  
Soheila Moein ◽  
Fatemeh Farmani ◽  
Sahere Rozbehan ◽  
Zahra Sabahi

Introduction: In most ancient cultures, honey has been used for both nutritional and medical purposes. Objectives: In this research, phenolic extracts of four Iranian honeys were evaluated to determine the antioxidant potentials using DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging, nitric oxide (NO) radical scavenging and reducing power by ferric reducing activity of plasma (FRAP) method. Additionally, anti-diabetic properties of honey and phenolic extracts were evaluated by determination of α-amylase and α-glucosidase inhibition. Patients and Methods: Besides, reducing potential was evaluated by ferric-reducing antioxidant power method. Moreover, determination of phenolic and flavonoid contents was performed. Moreover, inhibition of α-amylase and α-glucosidase of honey and phenolic extracts were evaluated. Results: With considering to antioxidant potentials, Gavan (Astragalus) sample showed the greatest phenolic (3817±1.52 mg GAE/100 g), flavonoid contents (3.1±0.005 mg QE/100 g), and DPPH radical scavenging (IC50 = 2±0.003 mg/mL). Bahareh honey had the highest NO radical scavenging (IC50=0.0403±0.0009 mg/mL) and Meymand honey possessed the highest reducing potential by FRAP method (IC50=0.0018±0.000003 mg/mL). The maximum inhibition of α-glucosidase was shown in Meymand honey extract (46±0.1%). After sugar isolation, Zataria honey had the highest inhibition of α-glucosidase (54±0.6%) and the mode of α-amylase inhibition was noncompetitive by this honey. Whole extract (23±0.1%) and phenolic extract of Gavan honey presented the maximum inhibition of α-amylase (31.2±0.1%). Conclusion: Honey samples showed antioxidant potentials and anti-diabetic properties by retardation of α-amylase and α-glucosidase.


2019 ◽  
Vol 11 (1) ◽  
pp. 09-16
Author(s):  
Epi Supri Wardi ◽  
Zulkarni R Zulkarni R ◽  
Desy Nurdianti

Determination of total phenolate and antioxidant activity of red leaf extract (Erythrina fusca Lour) was done by UV-Vis spectrophotometry. This study aims to determine the total phenolic content and antioxidant activity of hexane, ethyl acetate and ethanol extract. The extracts were prepared using a non-polar-maseration method with hexane, ethyl acetate and ethanol solvents. The results showed total phenolic concentration using the Folin-Ciocalteu method were 0.412 g/100 g in the hexane extract, 1.782 g/100 g in the ethyl acetate extract and 5.455 g/100 g in the ethanol extract. Antioxidant activity conducted by using FRAP method (Ferric Reducing Antioxidant Power) were obtained 0,682 mmol Fe (II)/100 g at hexane extract, 5,186 mmol Fe (II)/100 g at ethyl acetate extract and 10,591 mmol Fe (II)/100 g on the ethanol extract. The antioxidant activity of gallic acid as standard was 44.356 g mmol Fe (II)/100g.


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