New Method for Carbohydrates Determination in Sugarcane Bagasse by HPAEC‐RPAD Using Glassy Carbon Electrode Modified with Carbon Nanotubes and Nickel Nanoparticles

Abstract

Second generation ethanol can be produced from carbohydrates released from both sugarcane bagasse cell wall and sugarcane straw. The development of new method for the analysis of carbohydrates is, in this sense, seen as extremely relevant in the area of bioenergy. Based on the above considerations, the scope of this work encompasses the identification and quantification of carbohydrates composition in sugarcane bagasse without the need of sample derivatization, developing a novel analytical method using a glassy carbon electrode modified with multi-walled carbon nanotubes containing nickel oxyhydroxide nanoparticles (GCE/MWCNT/NiOOH) and applying the modified electrode as a detector in HPAEC (High Performance Anion-Exchange Chromatography) with reverse pulsed amperometric detection (RPAD) towards the determination of arabinose, galactose, glucose and xylose in hydrolyzed sugarcane bagasse. The carbohydrates concentrations determined in the hydrolyzed sugarcane bagasse were 6.1 3 10 À4 mol L À1 , 1.0 3 10 À2 mol L À1 and 2.8 3 10 À3 mol L À1 for arabinose, glucose, and xylose respectively. Our results showed that the present method is, in essence, attractive for analysis in the course of the production process of second generation ethanol production in that it does not require sample derivatization, has rapid run time, satisfactory separation, and can be used for the detection of carbohydrates without the interference of other electroactive species.

Highly efficient and selective electrooxidation of glucose and xylose in alkaline medium at carbon supported alloyed PdAu nanocatalysts

“…In such applications, the activity of the electrocatalysts is more important that its selectivity because high power densities and low detection limits are required for these applications, respectively. The electrooxidation of glucose at different catalytic metals has then been extensively studied, while literature concerning that of xylose is scarcer 29,30 . The most studied catalytic metals are platinum and gold, because they display good activity for these reactions.…”

A Facile Controlled-Synthesis Method of Nanoparticles of Nickel Oxide/Hydroxide Anchored in Graphite/RGO for Alcohol Oxidation

“…The preparation of Ni(OH) 2 was carried out in two steps. 7,45,46 Firstly, nickel(II) hexacyanoferrate nanoparticles were electrodeposited by cyclic voltammetry during 25 consecutive sweeps between −0.2 V and 1.0 V vs Ag/AgCl (v = 100 mV s −1 ) in a solution of 0.5 mol l −1 of KCl composed of 0.10 mol l −1 of HCl, 0.50 mmol l −1 of K 3 Fe(CN) 6 and 1.0 mmol l −1 of Ni(NO 3 ) 2 . Subsequently, the formation of nickel hydroxide nanoparticles onto electrode surface was performed by cyclic voltammetry through 35 consecutive potential sweeps of −0.5 V at 1.0 V vs Ag/AgCl at 100 mV s −1 in a solution of 0.50 mol l −1 NaOH.…”