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Synthesis and Spectroscopic Characterization of an Unusual Succinylated Starch Applied to Carbon Paste Electrodes
Author(s) -
Sayka Rodrigo A.,
Rozada Thiago C.,
Lima Dhésmon,
Pessôa Christiana A.,
Viana Adriano G.,
Fiorin Barbara C.
Publication year - 2020
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201900056
Subject(s) - dielectric spectroscopy , electrochemistry , cyclic voltammetry , succinic anhydride , electrode , starch , materials science , analytical chemistry (journal) , infrared spectroscopy , chemical modification , chemistry , organic chemistry , polymer chemistry
This work presents the structural characterization of an unusual modified starch with succinic anhydride (2% w/v). The product characterized by infrared spectroscopy shows the carbonyl group band in 1724 cm −1 , while the 13 C NMR spectrum shows two signals in 174.71 and 31.61 ppm associated with the carbonyl and methylenic carbons from the symmetric succinyl group (OCOCH 2 CH 2 OCO). These analyses indicate a cross‐linked structure for the modified starch (CL starch). This product is used as a chemical modifier in carbon paste electrodes (CPE). Cyclic voltammetry and electrochemical impedance spectroscopy analyses show that the cross‐linked starch improves the electrochemical performance of the electrodes, since higher peak currents, lower charge transfer resistance values. Also, the increase in the CL starch proportion in CPE results in a higher current intensity for all proportions tested. This behavior can be attributed to decrease in hydrophilic character of the electrode material after the CL addition, which results in a lower capacitive behavior and a higher faradaic current. Among all the modified CPE, the one with 5% w/w CL per graphite proportion shows the best electrochemical features, suggesting its potential application as an electrochemical sensor for the detection of different chemical species of environmental and biological relevance.