CAJ | 학술논문

通过滴涂和电聚合的方法制备了石墨烯( GN)-多壁碳纳米管( MWCNTs)/聚烟酸( PNA)修饰玻碳电极。利用循环伏安法和差分脉冲伏安法考察了盐酸吡哆辛( VB6)在此修饰电极上的电化学行为和测定方法。结果表明,VB6在此修饰电极上有一明显的不可逆氧化峰(Epa=1.049 V),该电极与 GCE、PNA/GCE以及GN/MWCNT/GCE相比,VB6的氧化峰电流显著提高,电极反应为扩散控制的一电子两质子反应。利用差分脉冲伏安法对VB6进行测定,线性范围为0.05~200μmol/L,检出限为0.02μmol/L,相对平均偏差为3.1%(n=8)。本方法可用于测定VB6片和B族维生素片中的VB6含量测定,加标回收率为在96.1%~104.5%之间。
통과적도화전취합적방법제비료석묵희( GN)-다벽탄납미관( MWCNTs)/취연산( PNA)수식파탄전겁。이용순배복안법화차분맥충복안법고찰료염산필치신( VB6)재차수식전겁상적전화학행위화측정방법。결과표명,VB6재차수식전겁상유일명현적불가역양화봉(Epa=1.049 V),해전겁여 GCE、PNA/GCE이급GN/MWCNT/GCE상비,VB6적양화봉전류현저제고,전겁반응위확산공제적일전자량질자반응。이용차분맥충복안법대VB6진행측정,선성범위위0.05~200μmol/L,검출한위0.02μmol/L,상대평균편차위3.1%(n=8)。본방법가용우측정VB6편화B족유생소편중적VB6함량측정,가표회수솔위재96.1%~104.5%지간。
Graphene ( GN) and multiwalled carbon nanotubes ( MWCNT) composites were coated on glassy carbon electrode ( GCE ) and then poly ( nicotinic acid ) ( PNA ) was electrodeposited on the modified electrode. The electrochemical behavior of pyridoxine hydrochloride ( VB6 ) was investigated at the modified electrode by cyclic voltammetry ( CV ) and differential pulse voltammetry ( DPV ) . Results showed the oxidation current of VB6 at the GN-MWCNT/PNA/GCE was obviously larger than that at GCE, PNA/GCE and GN/MWCNT/GCE. The oxidation process of VB6 was an irreversible diffusion-controlled process involving one electron and two protons. The liner range between the peak current intensity of DPV and the concentration of VB6 was 0 . 05-200 μmol/L with a detection limit of 0 . 02 μmol/L ( S/N=3 ) . The modified electrode showed a good reproducibility with a relative standard deviation of 3 . 1% ( n=8 ) . The proposed method was applied to the analysis of vitamin B6 in vitamin B6 tablets and compound vitamin B tablets with recoveries between 96 . 1%-104 . 5%.