Voltammetric determination of condensed tannins with a glassy carbon electrode chemically modified with gold nanoparticles stabilized in carboxymethylcellulose

Piovesan, Jamille V.; Lima, Camila Alves de; Santana, Edson Roberto; Spinelli, Almir

doi:10.1016/j.snb.2016.09.057

Cited by 21 publications

(14 citation statements)

References 51 publications

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“…Electroanalytical techniques have proven to be a good alternative in this case, exhibiting low detection limits, high dynamic range and sensitivity. In addition, the instruments required are portable, of low cost and easy to use . Considering the severe short‐fall of funds which developed and developing countries are facing drug monitoring and rigorous quality control through low cost techniques such as stripping voltammetry is pertinent and of great interest.…”

Section: Introductionmentioning

confidence: 99%

A Novel Electrochemical Sensor Based on Silsesquioxane/Nickel (II) Phthalocyanine for the Determination of Sulfanilamide in Clinical and Drug Samples

et al. 2019

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This paper describes the immobilization of nickel (II) phthalocyanine‐tetrasulfonic acid tetrasodium salt (NiTsPc) in 3‐n‐propyl(3‐methylpyridinium) silsesquioxane chloride (Si3Pic+Cl−). This hybrid material was synthetized and characterized by 29Si NMR CP‐MAS, FTIR and DRS. The modified material, designated as Si3Pic+Cl−/NiTsPc, was used to build carbon paste electrodes to determine sulfanilamide (SFL) by differential pulse voltammetry. The modified electrode showed a higher current response when compared to the bare carbon paste electrode. The evaluation of SFL was possible in the presence of salicylic acid, commonly used in solid ointment compositions in a high concentration. Theoretical calculations using density functional theory were done aiming to shed light at dimerization process at SFL. The oxidation peak increased with increasing concentrations of SFL in the range of 35–301 μmol L−1. The LOD and LOQ values obtained were 12 and 35 μmol L−1 of SFL, respectively. The novel electrochemical sensor was successfully applied for the determination of SFL in pet drug samples, urine and serum through the standard addition method. Validation was performed through a comparison with values obtained by the molecular absorption spectrometry method and there were no significant differences in the results, as confirmed by the statistical paired t‐test. This demonstrates the promise of a new approach for analytical application in clinical and drug samples of sulfonamide compounds.

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Section: Introductionmentioning

confidence: 99%

A Novel Electrochemical Sensor Based on Silsesquioxane/Nickel (II) Phthalocyanine for the Determination of Sulfanilamide in Clinical and Drug Samples

et al. 2019

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“…35 Based from TGA obtained for PPy/TA, the maximum decomposition temperature of the PPy/TA composite increased to 307 °C (compared to PPy) which indicates the presence and interaction of TA with PPy chain via hydrogen bonding and hydrophobic interactions. 15 …”

Section: Resultsmentioning

confidence: 99%

“…The nal degradation of polymer was due to the composite backbone degradation that occurred above the temperature of 300 C. Generally, the decomposition of TA takes place at the temperature of 210 C and it burned at the temperature of 526 C. 35 Based from TGA obtained for PPy/TA, the maximum decomposition temperature of the PPy/TA composite increased to 307 C (compared to PPy) which indicates the presence and interaction of TA with PPy chain via hydrogen bonding and hydrophobic interactions. 15 All results showed the thermal stability enhancement of PPy in the presence of TA. However, adding CTAB to the composite lead to the decreasing in the thermal stability of the nancomposite.…”

Section: Chemical and Physical Propertiesmentioning

confidence: 86%

“…5 Due to the content of avonoid and phenolic compounds, TAs are widely used in a variety of applications such as the food industry, 6,7 natural healing for medical and pharmaceutical uses, [8][9][10][11] adhesive resins, 12 and corrosion inhibition, 13 while only a few studies have been reported on the application of tannins in sensors. 14,15 In this research condensed tannin with sufficient hydroxyls was introduced into polypyrrole to prepare a composite of PPy/ TA with enhanced mechanical and electrochemical properties of the composites. The composite of PPy and TA synergistically combine the electrical properties of conducting polymers (CPs) with the structural advantages of bio-based polymers that is useful in different applications.…”

Section: Introductionmentioning

confidence: 99%

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Polypyrrole/tannin biobased nanocomposite with enhanced electrochemical and physical properties

et al. 2018

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“…It has been reported that they are used to stop small local bleeding, decrease buccal cavity inflammations, colds, bronchitis, burns, hemorrhoids, etc. (Piovesan et al, 2017;Kasay et al, 2013). Also, the condensed tannins' chemical nature makes them a natural source of organic compounds, with an application potentially wide for medicinal and industrial uses (Aguilar-López et al, 2012).…”

Section: Condensed Tanninsmentioning

confidence: 99%

Mangiferin content, carotenoids, tannins and oxygen radical absorbance capacity (ORAC) values of six mango (Mangifera indica) cultivars from the Colombian Caribbean

Morales¹,

Zapata²,

Jaimes³

et al. 2017

J. Med. Plants Res.

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Mango is one of the tropical fruits of greater production and consumption in the world, and a rich source of bioactive compounds, with various functional properties such as antioxidant activity. In Colombia, mango's market is very broad and diverse. However, there are very few studies that determined the content of bioactive secondary metabolites. The objective of this study was to evaluated the content of different metabolites like Mangiferin, carotenoids, tannins, and the antioxidant capacity by oxygen radical absorbance capacity (ORAC) methodology of six cultivars from the Colombian Caribbean region, with total carotenoid values ranging from 24.67 to 196.15 mg of β-carotene/100 g dry pulp; 84.30 to 161.49 mg Catequine eq./100 g dry pulp for the content of condensed tannins, and 91.80 to 259.23 mg/100 g dry pulp for mangiferin content. The ORAC methodology showed important antioxidant activity results, such as the Chancleta variety with the highest value (2163.78 μmol Trolox/100 g dry pulp). In conclusion, the evaluated mango varieties had promising results as functional food of high nutraceutical value, being Chancleta, Criollo and Jobo varieties, the fruits with highest content in bioactive compounds that expressed the best antioxidant activity.

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Voltammetric determination of condensed tannins with a glassy carbon electrode chemically modified with gold nanoparticles stabilized in carboxymethylcellulose

Cited by 21 publications

References 51 publications

A Novel Electrochemical Sensor Based on Silsesquioxane/Nickel (II) Phthalocyanine for the Determination of Sulfanilamide in Clinical and Drug Samples

A Novel Electrochemical Sensor Based on Silsesquioxane/Nickel (II) Phthalocyanine for the Determination of Sulfanilamide in Clinical and Drug Samples

Polypyrrole/tannin biobased nanocomposite with enhanced electrochemical and physical properties

Mangiferin content, carotenoids, tannins and oxygen radical absorbance capacity (ORAC) values of six mango (Mangifera indica) cultivars from the Colombian Caribbean

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