Voltammetric and spectrometric determination of antioxidant capacity of selected wines

Electrochemical behavior and determination of major phenolic antioxidants in selected coffee samples

“…Thus, taking into account that the determination of specific antioxidants is usually achieved by hyphenated techniques, which demand expensive apparatus, highly skilled technicians, complicated and time-consuming procedures, electroanalysis becomes a very attractive option (Escarpa, 2012;Jones, Magri, Rios, & Jones, 2011;Khanchi, Mahani, Hajihosseini, & Maragheh, 2007;López-Martinez, López-de-Alba, Garcia-Campos, & LeónRodriguez, 2003;Regan & Shakalisava, 2005). Hence, the electroanalysis may have dual function, on the evaluation of the antioxidant power, and also for the tentative determination of specific classes (Blasco et al, 2007;Escarpa, 2012;Kilmartin & Hsu, 2003;Lino et al, 2014;Rawat, Chandra, & Sarkar, 2010).…”

“…The FC method is based on the reduction of phosphomolybdic-phosphotungstic acid reagent, by phenolics compounds, to a blue compound in an alkaline medium (Blasco et al, 2007;Everette et al, 2010;Singleton, Orthofer, & Lamuela-Raventos, 1999 FC reagent, thus leading to overestimation of the results for TPC and hampering the accuracy too (Blasco et al, 2007;Escarpa, 2012;Singleton et al, 1999). Moreover, many substances present in such natural products can absorb in the same wave-length range, thus interfering on the accuracy of DPPH and FC methods (Basnet et al, 1996;Escarpa, 2012;Lino et al, 2014).…”

“…Indeed, the electrochemical methods present many advantages such as quickness, simplicity, sensitivity, reduced sample and reagent consumption (Blasco et al, 2007;Kilmartin & Hsu, 2003;Lino et al, 2014;Sharma, Gulati, Ravindranath, & Kumar, 2005). Moreover, such assays according to the experimental conditions, can allow the elucidation of the redox behavior and the determination of specific antioxidant classes (Blasco, González, & Escarpa, 2004;Escarpa, 2012;Kilmartin & Hsu, 2003;, as well as to categorize according to their electrochemical index or antioxidant power (Blasco et al, 2005;Escarpa, 2012;Lino et al, 2014).…”

“…Indeed, the electrochemical methods present many advantages such as quickness, simplicity, sensitivity, reduced sample and reagent consumption (Blasco et al, 2007;Kilmartin & Hsu, 2003;Lino et al, 2014;Sharma, Gulati, Ravindranath, & Kumar, 2005). Moreover, such assays according to the experimental conditions, can allow the elucidation of the redox behavior and the determination of specific antioxidant classes (Blasco, González, & Escarpa, 2004;Escarpa, 2012;Kilmartin & Hsu, 2003;, as well as to categorize according to their electrochemical index or antioxidant power (Blasco et al, 2005;Escarpa, 2012;Lino et al, 2014). Thus, taking into account that the determination of specific antioxidants is usually achieved by hyphenated techniques, which demand expensive apparatus, highly skilled technicians, complicated and time-consuming procedures, electroanalysis becomes a very attractive option (Escarpa, 2012;Jones, Magri, Rios, & Jones, 2011;Khanchi, Mahani, Hajihosseini, & Maragheh, 2007;López-Martinez, López-de-Alba, Garcia-Campos, & LeónRodriguez, 2003;Regan & Shakalisava, 2005).…”

Electrochemical Methods for Total Antioxidant Capacity and its Main Contributors Determination: A review

“…Exogenous antioxidants are natural (vitamin C, vitamin E, carotenoids, phenolic compounds such as flavonoids, phenolic acids, anthocyanins, proteins such as transferrin, ceruloplasmin or albumin, some minerals like Se) or synthetic compounds, such as butylated hydroxyanisole, butylated hydroxytoluene, gallates, etc. It is recognized that vegetables, fruits, grains and beverages such as tea, juice and wine constitute significant sources of natural exogenous antioxidants [25,28,29]. Their intake has been confirmed to lower the oxidative stress [30][31][32].…”