Jian-Ling He,Wei Kou,Cheng Li,Juan-Juan Cai,Fen-Ying Kong,Wei Wang
Currently, as food additives, synthetic colourants have been drawn much attention. This paper studied the electrocatalytic oxidation of amaranth (AM), with a novel electrochemical sensor based on singlewalled carbon nanotube-Titanium nitride (SWCNT-TiN) nanocomposites modified glassy carbon electrode. Owing to the high accumulation effect and great catalytic capability of SWCNT-TiN nanocomposites, the developed sensor exhibited well-defined voltammetric peaks for AM. The peak currents of AM increased linearly with its concentration in the ranges of 0.1-100 μM. The detection limit is 40 nM. The developed sensor was successfully applied in the determination of AM in beverage samples. Results indicated that the developed sensor was fast, sensitive and reliable.
Yiyong Wu,Guangli Li,Yaling Tian,Jinxia Feng,Jingyun Xiao,Jun Liu,Xia Liu,Quanguo He
A novel amaranth electrochemical sensor was produced by electrodepositing a molecularly imprinted polypyrrole film in the presence of amaranth on a multi-walled carbon nanotube (MWCNT) surface. Template molecules were completely eluted through an innovative strategy that only requires the application of a fixed electrical potential in a blank phosphate buffer solution. Obviously, this strategy is much faster and more eco-friendly. The molecularly imprinted polymer (MIP)-based electrochemical sensor was systematically investigated by scanning electron microscopy, atomic force microscopy, X-ray diffraction, cyclic voltammetry, and electrochemical impedance spectroscopy. The resultant MIP/MWCNT modified glass carbon electrode (MIP/MWCNT/GCE) shows satisfactory electroactive surface area and charge transfer resistance. As expected, the electrochemical response signals were significantly amplified at the MIP/MWCNT/GCE. Under optimal conditions, the proposed MIP/MWCNT/GCE exhibits extraordinarily good analytical performance for amaranth detection, with two wide detection ranges (0.007 μM to 1.0 μM, and 0.40 μM to 17 μM) and detection possible down to 0.4 nM. Moreover, the polypyrrole MIP films show high binding affinity and specifically identifies amaranth molecules, enabling the robust detection of amaranth in a complicated matrix with excellent selectivity, reproducibility, and stability. The proposed sensor achieves accurate detection of amaranth concentration in various fruit drinks with acceptable recovery.
Improving biomass enzymatic saccharification is effective for crop straw utilization, whereas phytoremediation is efficient for trace metal elimination from polluted agricultural soil . Here, we found that the green proteins extracted from Amaranthus leaf tissue could act as active biosurfactant to remarkably enhance lignocellulose enzymatic saccharification for high bioethanol production examined in eight grassy and woody plants after mild chemical and green-like pretreatments were performed. Notably, this study estimated that total green proteins supply collected from one-hectare-land Amaranth plants could even lead to additional 6400–12,400 tons of bioethanol, being over 10-fold bioethanol yield higher than those of soybean seed proteins and chemical surfactant. Meanwhile, the Amaranth green proteins were characterized as a dominated biosorbent for multiple trace metals (Cd, Pb, As) adsorption, being 2.9–6 folds higher than those of its lignocellulose. The Amaranth plants were also assessed to accumulate much more trace metals than all other plants as previously examined from large-scale contaminated soils. Furthermore, the Amaranth green proteins not only effectively block lignin to release active cellulases for the mostly enhanced biomass hydrolyzes, but also efficiently involve in multiple chemical bindings with Cd, which should thus address critical issues of high-costly biomass waste utilization and low-efficient trace metal remediation.
危险品化学品经营许可证（带存储）