A Simple Sensitive Spectrophotometric Method for the Determination of Ce 4+ Using Variamine Blue as a Chromogenic Reagent

Mathew, Mendalin; Narayana, B.; Sreekumar, N. V.; Vipin, K.

doi:10.1007/s00604-003-0055-8

Cited by 6 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plant extracts were also assessed for their selenium content using an azure B-based method [ 42 ]. As found for the DPPH free radical-scavenging activities and the FRAP values as well as total phenolic and total flavonoid contents, the extracts from I. stipularis , C. guyanensis , and A. jupunba had the highest selenium contents, namely 16.7 ± 1.8, 13.7 ± 2.2, and 12.2 ± 0.7 μg/g ( Table 5 ).…”

Section: Resultsmentioning

confidence: 99%

“…The selenium content of the plant extracts was determined by a previously described spectrophotometric method using azure B as a chromogenic reagent [ 42 ]. This method relies on the reaction of selenium with potassium iodide in acidic medium to liberate iodine that bleaches the violet color of azure B, resulting in a decrease in its absorption that is linearly related to selenium concentration.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Insight into the antioxidant activities of ten Fabaceae plant species that are medicinally used by the Aucan Tribal Peoples from the Republic of Suriname (South America)

Mans¹,

Pinas²,

Djotaroeno³

et al. 2022

GSC Biol. Pharm. Sci.

View full text Add to dashboard Cite

Fabaceae are associated with a high antioxidant activity (AA) and a high total phenolic (TPC), total flavonoid (TFC), and selenium content (SeC). In this study, the aqueous extracts from ten Fabaceae species that are medicinally used by the Aucan Tribal Peoples from Suriname (South America), were evaluated for AA using a DPPH and a FRAP assay, and for TPC, TFC, and SeC using Folin-Ciocalteu’s, an AlCl3 colorimetric, and an azure B-based method. Associations between pairs of these variables were determined by Pearson correlation coefficient. One-way ANOVA with post-hoc Tukey’s test was used to evaluate the data for statistically significant differences (p < 0.05). The I. stipularis (bark), C. guyanensis (bark), A. jupunba (twigs), and M. urens (fruit) extracts had the highest DPPH IC50 values (36 - 70 μg/mL) and FRAP values (346 - 573 µM FeE/100 μg) and the highest TPC (25 - 41 GAEq/100 μg), TFC (21 - 39 REq/100 μg), and SeC (4 - 17 μg/g). The values for the T. indica (leaf), P. macroloba (bark), M. pigra (whole plant), S. quinquangulata (leaf), A. sensitiva (whole plant), and L. leucocephala (leaf) extracts were > 10-fold lower. AA, TPC, TFC, and SeC correlated well with each other (correlation coefficient ≥ 0.83, p ≤ 0.0030). Thus, AA, TPC, TFC, and SeC may represent important determinants of the health benefits of the former four samples but not of the others. Future studies should focus on the precise contribution of AA, TPC, TFC, and SeC to the therapeutic value of medicinal Fabaceae.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Insight into the antioxidant activities of ten Fabaceae plant species that are medicinally used by the Aucan Tribal Peoples from the Republic of Suriname (South America)

Mans¹,

Pinas²,

Djotaroeno³

et al. 2022

GSC Biol. Pharm. Sci.

View full text Add to dashboard Cite

show abstract

“…[31] Also a huge literature is available for direct spectrophotometric determination of selenium (IV) using various reagents. [32][33][34][35][36][37][38][39][40][41][42] Extractive spectrophotometric determination of selenium (IV) has been reported using a sensitive reagent allied with direct extractionspectrophotometric determination at quantitative level using selective solvent. [43][44][45] The reported methods were sensitive with some merits but they are also associated with serious drawbacks viz: narrow beer's range, need of temperature controlled oxidation condition for catalytic and catalytic kinetic determination, laborious procedure, interferences from foreign ions, need of heating for complex formation, long time equilibration for quantitative extraction, less stability of the complex and rarely available reagent.…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction, Spectrophotometric Determination of Selenium (Iv) at Microgram Level Using O-Methylphenyl Thiourea as a Sensitive Reagent: Analysis of Pharmaceuticals, Synthetic Mixtures and Real Samples

Kuchekar¹

2017

WJPPS

View full text Add to dashboard Cite

“…However some of the reagents recommended suffer through limitations such as slow or incomplete extraction of metal and lack of sensitivity [10]. The comparison of the present method with reported methods [11][12][13][14][15][16] ), single extraction.…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction and Spectrophotometric Determination of Cerium(IV) by Using <i>o</i>-Methoxy Phenylthiourea as an Analytical Reagent

Kuchekar¹,

Naval²,

Han

2016

SERDJ

View full text Add to dashboard Cite

A solvent extraction spectrophotometric determination method was developed for cerium(IV) using o-methoxy phenylthiourea (OMePT) as a selective reagent. A ternary complex was formed after liquid-liquid extraction from 0.05 mol L-1 potassium iodide aqueous media using 2.0×10-4 mol L-1 OMePT in chloroform and is measured spectrophotometrically at 318 nm. The validity of Beer's law was in the concentration range up to 22.5 μg mL-1 , with molar absorptivity and Sandell's sensitivity values of 3.38×10 3 L mol-1 cm-1 and 0.041 μg cm-2 respectively. The stoichiometry of the cerium(IV)-OMePT-iodide complex was determined by the slope ratio method and verified by the mole ratio method. The complex was stable for more than 48 h. The method is free from interferences from large number of cations and anions. The developed method was successfully employed for the determination of cerium(IV) from binary synthetic mixtures, ternary synthetic mixtures, soil, tap water and sea water samples.

show abstract

A Simple Sensitive Spectrophotometric Method for the Determination of Ce 4+ Using Variamine Blue as a Chromogenic Reagent

Cited by 6 publications

References 1 publication

Insight into the antioxidant activities of ten Fabaceae plant species that are medicinally used by the Aucan Tribal Peoples from the Republic of Suriname (South America)

Insight into the antioxidant activities of ten Fabaceae plant species that are medicinally used by the Aucan Tribal Peoples from the Republic of Suriname (South America)

Solvent Extraction, Spectrophotometric Determination of Selenium (Iv) at Microgram Level Using O-Methylphenyl Thiourea as a Sensitive Reagent: Analysis of Pharmaceuticals, Synthetic Mixtures and Real Samples

Solvent Extraction and Spectrophotometric Determination of Cerium(IV) by Using <i>o</i>-Methoxy Phenylthiourea as an Analytical Reagent

Contact Info

Product

Resources

About