Quantitative analysis and free-radical-scavenging activity of chlorophyll, phytic acid, and condensed tannins in canola

Khattab, Rabie; Goldberg, Erin; Lin, Lin; Thiyam, Usha

doi:10.1016/j.foodchem.2010.03.081

Cited by 64 publications

(55 citation statements)

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“…The maximum absorbance of the DPPH ethanolic solution was attained at 517 nm. The method determines the antiradical power by measuring a decrease in the DPPH absorbance, resulting in color change from purple to yellow, when the DPPH is scavenged by an antioxidant molecule [11,22]. Few papers discuss the antioxidant activity of phytic acid alone or in emulsion.…”

Section: Dpph Free Radical Scavenging Testmentioning

confidence: 99%

“…The resulting solution was colorless and became brown [10]. Khattab et al (2010) [11] also evaluated phytic acid and other bioactive components of canola seeds, and determined the free-radical-scavenging activity of phytic acid by DPPH (1,1-diphenyl-2-picrylhydrazyl). The authors concluded that phytic acid showed optimal DPPH-scavenging activity, the highest antioxidant effect observed followed by condensed tannins and chlorophyll.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

et al. 2015

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Phytic acid is a natural compound widely used as depigmenting agent in cosmetic emulsions. Few studies are available in the literature covering the stability and the antioxidating property of this substance, used alone or into emulsions. Therefore, the purpose of this work was to investigate the thermal behavior and antioxidant properties of phytic acid alone and into cosmetic emulsions. The thermal behavior of this substance was evaluated by thermogravimetry (TG)/derivative thermogravimetry (DTG) and differential scanning calorimetry (DSC) and the free-radical-scavenging activity by 1,1-diphenyl-2-picrylhydrazyl (DPPH). TG/DTG and DSC curves allowed evaluation of the thermal behavior of phytic acid. These results showed that the substance presented four stages of mass loss. Thermal decomposition of the material initiated at 150 °C. Thermal behavior of the cosmetic emulsions detected that the addition of phytic acid decreased the thermal stability of the system. DPPH free-radical-scavenging activity showed that phytic acid incorporated into emulsion had no antioxidant capacity compared to BHT. In summary, we concluded that the thermoanalytical techniques (TG and DSC) were efficient and reliable in the characterization of phytic acid alone and incorporated into cosmetic emulsions. OPEN ACCESSCosmetics 2015, 2 249

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Section: Dpph Free Radical Scavenging Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

et al. 2015

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“…Only, Matthäus (2002) and Khattab et al (2010) extracted antioxidants from defatted oilseeds meal using sonication for 45 and 1 min, respectively, but the optimum conditions of these extraction procedures were not found.…”

Section: Introductionmentioning

confidence: 97%

“…The total content of polar phenolics in rapeseed is significantly higher (about ten times) than those of insoluble components. Therefore, more polar solvent such as methanol and their aqueous mixture are usually used for extraction of phenolics from rapeseed (Amarowicz et al 2003;Dwiecki et al 2012;Farag et al 2013;Khattab et al 2010;Maltas and Yildiz 2011;Matthäus 2002;Szydłowska-Czerniak et al 2010, 2013. Antioxidants present in rapeseed and its products are important in the prevention and treatment of coronary heart diseases, neurodegenerative and autoimmune diseases, aging, cancers, diabetes, hypertension, and rheumatoid arthritis and exhibit antiradical activity (Szydłowska-Czerniak 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Only few methods, 2,2′-diphenyl-1-picrylhydrazyl (DPPH) (Amarowicz et al 2000(Amarowicz et al , 2003Dwiecki et al 2012;Farag et al 2013;Khattab et al 2010;Matthäus 2002;Szydłowska-Czerniak et al 2010Szydłowska-Czerniak and Tułodziecka 2013;Yoshie-Stark et al 2006), ferric-reducing antioxidant power (FRAP) (Szydłowska-Czerniak et al 2010Szydłowska-Czerniak and Tułodziecka 2013), reducing power (Amarowicz et al 2000(Amarowicz et al , 2003, oxygen radical absorbance capacity (ORAC) (Szydłowska-Czerniak et al 2010), cupric reducing antioxidant capacity (CUPRAC) (Maltas and Yildiz 2011), β-carotene-linoleic acid (Amarowicz et al 2003;Maltas and Yildiz 2011;Matthäus 2002), scavenging ability of hydrogen peroxide (Maltas and Yildiz 2011), electron spin resonance (ESR) (Matthäus 2002), enhanced chemiluminescence (ECL) (Amarowicz et al 2003), photochemiluminescence (PCL) (Amarowicz et al 2003), and assay based on formation of silver nanoparticles (AgNP) (Szydłowska-Czerniak and Tułodziecka 2013), were used for determination of antioxidant capacity of different rapeseed varieties.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Ultrasound-Assisted Extraction Procedure to Determine Antioxidant Capacity of Rapeseed Cultivars

Szydłowska‐Czerniak

Tułodziecka

2014

Food Anal. Methods

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Ultrasound-assisted extraction (UAE) was applied to extract total antioxidants from two rapeseed varieties. The antioxidant capacity of spring and winter rapeseed cultivars was determined by two different analytical methods: 2,2′-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) and 2,2′-diphenyl-1-picrylhydrazyl (DPPH). Effects of three independent variables, sonication time (t), volume of methanol-torapeseed weight ratio (V/m), and concentration of methanol (c) on the antioxidant capacity of rapeseed varieties, were studied by response surface methodology (RSM). Box-Behnken design (BBD) was used to obtain the optimal conditions of the UAE. The optimal UAE conditions were evaluated with an extraction time of 13.8 min, a solvent-to-material ratio of 26.2 mL/g and a solvent concentration of 50.3 % for antioxidant capacity of spring rapeseed cultivar (ABTS=62.7 mmol Trolox equivalent (TE)/100 g, DPPH=38.3 mmol TE/100 g), whereas the predicted optimum t=13.3 min, V/m=29.5 mL/g, and c=38.3 % resulted in ABTS=62.0 mmol TE/100 g, DPPH=48.6 mmol TE/100 g for a winter rapeseed cultivar. Results of ABTS and DPPH determinations correlate with the predicted values (R 2 =0.9435 and 0.9796 for the spring rapeseed variety and 0.9952, 0.9252 for the winter rapeseed variety).

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Radical‐Scavenging Lithium Salt for Stable High‐Voltage Li||LiCoO₂ Batteries

Yang,

Yu,

et al. 2024

Advanced Energy Materials

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High‐voltage cathodes improve the energy density of the batteries, which satisfies the pursuit of high‐energy‐density lithium metal batteries (LMBs). However, layered lithium cobalt oxide (LiCoO2) cathodes suffer from severe interfacial side reactions under high voltage (4.6 V), which is detrimental for practical applications. Herein, a functional lithium salt, 2,2,6,6‐tetramethyl‐1‐piperidinyloxyl‐4‐sulfate lithium (TEMPO‐OSO3Li) is developed that possesses radical‐scavenging anion TEMPO‐OSO3−. The anion accumulates at the cathode interface and effectively scavenges free radicals under the electric field at high voltage, thereby, inhibiting the electrolyte decomposition and interfacial side reactions. As a result, the Li||LiCoO2 batteries with dual‐salt (TEMPO‐OSO3Li (0.02 m) and LiPF6 (1 m)) electrolyte exhibit high capacity retention of 92% after 100 cycles at 4.6 V and maintain 81% after 200 cycles, which is superior to that of the baseline electrolyte (26%). The work demonstrates a promising strategy for designing electrolyte salts to realize the practical application of LiCoO2 at high voltage.

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Quantitative analysis and free-radical-scavenging activity of chlorophyll, phytic acid, and condensed tannins in canola

Cited by 64 publications

References 35 publications

Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

Optimization of Ultrasound-Assisted Extraction Procedure to Determine Antioxidant Capacity of Rapeseed Cultivars

Radical‐Scavenging Lithium Salt for Stable High‐Voltage Li||LiCoO₂ Batteries

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Quantitative analysis and free-radical-scavenging activity of chlorophyll, phytic acid, and condensed tannins in canola

Cited by 64 publications

References 35 publications

Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

Optimization of Ultrasound-Assisted Extraction Procedure to Determine Antioxidant Capacity of Rapeseed Cultivars

Radical‐Scavenging Lithium Salt for Stable High‐Voltage Li||LiCoO2 Batteries

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Product

Resources

About

Radical‐Scavenging Lithium Salt for Stable High‐Voltage Li||LiCoO₂ Batteries