WITHDRAWN: Electrochemical behavior of kaempferol and its determination in presence of quercetin employing multi-walled carbon nanotube modified carbon paste electrode

Abstract

Electrochemical behavior of kaempferol and its determination in presence of quercetin employing multiwalled carbon nanotube modified carbon paste electrode, Analytical Chemistry Research (2015), Abstract Electrocatalytic oxidation of kaempferol in presence of quercetin using multiwalled carbon nanotubes modified carbon paste electrode (MWCNTs/CPE) in phosphate buffer of pH 7.73. AbstractThe electrochemical behavior of kaempferol was investigated by cyclic voltammetry (CV) and square wave voltammetry (SWV) at plane and multiwalled carbon nanotubes modified carbon paste electrode (MWCNTs/CPE). Kaempferol produces an anodic peak at MWCNTs modified CPE with a quasi-reversible nature in phosphate buffer of pH 7.73. The oxidized species of kaempferol was found to be stable (Ip a /Ip c ≈1) over scan rates of 100~600 mVs -1 . The same electrode was also found to catalyze the electrode oxidation of quercetin in presence of kaempferol under similar conditions which enabled the simultaneous determination of kaempferol and quercetin. Linearity of peak currents (Ip) vs. concentrations of kaempferol and quercetin was found in the range of 6.72 x 10 -9 M to 40.34 x 10 -9 M with a detection limit of 2.90 x 10 -9 M for kaempferol and 13.0 x 10 -9 M to 50.9 x 10 -9 M with a detection limit of 3.5 x 10 -9 M for quercetin using fast and sensitive SWV. The developed method has been applied for the quantitative analysis of kaempferol in corms and petals of Indian traditional medicine saffron (Crocus sativus) using a phosphate buffer of pH 7.73 and the average percent recoveries obtained are 99.84 and 99.26, respectively.

Dengue Fever: Therapeutic Potential of Carica papaya L. Leaves

“…Teng et al (2019) isolated carpaine from alkaloidal hexane extract of Papaya leaves and confirmed the identity of the compound "carpaine" by NMR, MS, FT-IR, and X-ray crystal data (Teng et al, 2019) Akhila and Vijayalakshmi (2015) have reported and identified 21 compounds present in the aqueous extracts of the leaves. They were tocopherol, ascorbic acid, carpaine, deoxykaempferol, kaempferol, deoxyquercetin, quercetin, dicoumarol, coumaroylquinic acid, coumarin, folic acid, cysteine, homocysteine, cysteine sulphoxide, l glutamic acid, p-coumaroyl alcohol, dimethoxy phenol, umbelliferone, phenylalanine, caffeoyl alcohol, and methyl nonyl ketone (Akhila and Vijayalakshmi, 2015;Dar et al, 2016;Karakaya et al, 2019). Another study revealed the presence of decylene, transgeranylacetone, methyl tridecanoate, palmitic acid, myristic acid, hexadecanoic acid, linolelaidic acid, methyl cis-6-octadecenoate, stearic acid, oleic acid, 15-tetracosenoic acid, methyl heptacosanoate, trans-13-docosenoic acid, methyl erucate, methyl behenate, heneicosanoic acid, farnesyl cyanide in n-hexane, and methanol (60:40% ratios) extract of the leaves.…”