Electrochemical behaviour of pyridoxine hydrochloride (vitamin B6) at carbon paste electrode modified with crown ethers

Voltammetric determination of vitamin B6 (Pyridoxine) using multi wall carbon nanotube modified carbon-ceramic electrode

“…The E p -E p/2 value was observed to be 89.5 mV at 50 mV s -1 scan rate, which is close to the theoretical value of 95 mV for a totally irreversible reaction. The value of n was calculated to be 0.935, which is close to one [19]. As E p is a function of scan rate for a totally irreversible wave, the effect of scan rate on the oxidation of pyridoxine on the MWCNT/CCE has been studied.…”

“…Using the slope of I p of cyclic voltammograms vs C pyridoxine (I p =2.99×10 5 n [(Įn Į ) 1/2 ]A C pyridoxine D 1/2 ȣ 1/2 ) and considering Įn Į =0.57, D pyridoxine =1.4 ×10 -5 cm 2 s -1 [18], A=0.119 cm 2 , and ȣ=50 mV s -1 , it is found that the total number of electrons involved in the anodic oxidation of B 6 is about 1.93, close to 2. Based on the obtained results and according to the literature evidences [18,19,[25][26][27][28][29], the mechanism of pyridoxine oxidation followed by: firstly pyridoxine molecules undergoes one electron oxidation at the electrode surface resulting in a radical ion (pyridoxine +. ) formation, which produces the most stable of the resonating structure [19] and then the cation radical will produce a final stable product via another one electron oxidation process [18,26,27].…”

“…Furthermore, there are reports where the glassy carbon electrodes have been modified using various modifiers such as a novel carbon nanotube [16] and polymethylene blue [17] and we have reported the electrocatalytic oxidation of pyridoxine on an aluminum electrode modified with metallic palladium particles/iron (III) hexacyanoferrate (II) film as a chemically modified electrode for the determination of pyridoxine [18]. Recently, electrochemical behaviour of pyridoxine hydrochloride at carbon paste electrode modified with crown ethers [19] has been reported.…”

Simultaneous electro-catalytic oxidative determination of ascorbic acid and folic acid using Fe3O4 nanoparticles modified carbon paste electrode

“…Carbon paste electrodes (CPE) are used in electrochemistry [21] due to their ease of construction, chemical inertness, better reproducibility and stability. Moreover CPE in the form of chemically modified carbon paste electrode (CME) have been widely used due to its enhancement in sensitivity of the electrochemical method [22][23][24][25]. Nanoparticles based CME's have been the spotlight because of their increased sensitivity, amplified response signal, and better reproducibility [26][27][28][29][30].…”

Detection of B6 Vitamers in Grain Products: Experimental and Computational Studies

“…2 a Chromatogram of vitamin B in reference materials CRM 121 (wholemeal flour) 1-PM (t R 3.7 min, 0.08 μg mL -1 ), 2-PL (t R 4.7 min, 0.54 μg mL -1 ), 3-PN (t R 5.6 min, 0.12 μg mL -1 ), ED sensitivity 50 μA. b Chromatogram of vitamin B in wheat bread sample (A) 2-PL (t R 4.7 min, 4.4 ng mL −1 ), 3-PN (t R 5.6 min, 32.2 ng mL −1 ) (Desai et al 2008;Eitenmiller and Landen 1999;Eitenmiller et al 2008). Nishimura et al (2008) have established a method for the determination of individual vitamin B 6 compounds on the basis that the B 6 vitamers are converted by enzymes into highly fluorescent 4-pyridoxolactone.…”