Chemically modified electrode, preparation thereof and method for rapid determination of acid value of plant oil

A technology of chemical modification and vegetable oleic acid, which is applied in the field of chemically modified electrodes and its preparation and rapid determination of vegetable oil acid value, achieving the effects of good stability and repeatability, excellent sensitivity and accuracy

Inactive Publication Date: 2010-11-24
CHINA AGRI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

This innovative modification technique allows for stable and repetitive use of improved catalyst materials made from Pt (platinum) metal plates that can be used during chemical reactions like oxidations. By controllably adjusting certain parameters such as voltage applied across different parts of the device, it becomes possible to achieve specific results on various types of samples containing organic acids at low concentrations without affecting their colors or fluorescent properties. These modifications also improve sensor performance over existing techniques while reducing its size.

Problems solved by technology

Technological Problem addressed by these technical problem discussed in this patent include improving the quality control of fried products during production processes due to factors like volatile substances, pH changes caused by temperature fluctuations, and impurities added through process steps. Current techniques involve analyzing only specific components while also requiring complex equipment and skilled operators who may lead to errors. Therefore, an improved method called ionosensitive field effect transistor (ISFT) gasochemistry detector (ICGID) solving these issues would provide better safety measures and faster testing times compared to existing technologies.

Method used

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  • Chemically modified electrode, preparation thereof and method for rapid determination of acid value of plant oil
  • Chemically modified electrode, preparation thereof and method for rapid determination of acid value of plant oil
  • Chemically modified electrode, preparation thereof and method for rapid determination of acid value of plant oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A chemically modified electrode for measuring the acid value of vegetable oil is a platinum electrode modified by polypyrrole doped with perchlorate ions. Electropolymerization of pyrrole polymers doped with perchlorate ions on the surface of platinum electrodes.

[0042] The preparation method of the chemically modified electrode is as follows: it is prepared by electrochemical polymerization, the surface of the platinum electrode is cleaned and dried for later use, and the cleaned and dried platinum electrode is placed in a modification solution, which contains pyrrole monomer and tetrabutyl An acetonitrile solution of ammonium perchlorate, the concentration of pyrrole monomer in the modification solution is 0.015mol / L, and the concentration of perchlorate anion is 0.1mol / L. Before electropolymerization, the modification solution is treated with nitrogen to remove the Then use the electrochemical workstation to carry out electropolymerization using constant potential ...

Embodiment 2

[0045] This example is an experiment conducted to determine the stability and reproducibility of polypyrrole-doped tetrabutyl perchlorate ammonium modified electrode for evaluation.

[0046] a. Evaluation of reproducibility

[0047] Prepare 15 modified electrodes under the same electropolymerization conditions, record their linear voltammograms under the same electrolyte solution and the same electrical parameter conditions, do three parallel experiments for each electrode and sample, and take the average value as The measurement result of the current response of each modified electrode, and then calculate the average value of 15 modified electrodes, the result is: 2.1×10 -3 The average value of the reduction peak current of M linoleic acid was 52.6±1.8 μA (n=15, RSD=3.42%).

[0048] b. Stability evaluation

[0049] The reduction peak currents of the newly prepared modified electrode and the same modified electrode stored under dry and light-proof conditions for one month we...

Embodiment 3

[0051] This example is a comparative experiment done in order to illustrate that the polypyrrole-doped tetrabutyl perchlorate ammonium modified electrode has better detection performance than the bare electrode.

[0052] The specific method is to carry out cyclic voltammetry scanning with two kinds of electrodes respectively in the standard linoleic acid solution of the same concentration, observe their reduction current responses, and find that on the modified electrode, the peak current of linoleic acid reduction increases significantly (about 1.5 ~2 times), the reduction peak potential shifted about 200mV to the positive direction, indicating that the modified electrode has a significant catalytic effect on the electrochemical reduction of linoleic acid. The cyclic voltammograms of the modified electrode obtained by this method and the bare electrode when detecting the same concentration of linoleic acid are as follows: figure 1 shown.

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Abstract

The invention discloses a chemically modified electrode, preparation of the chemically modified electrode and a method for rapid determination of acid value of plant oil, which belong to the technical field of the rapid determination of the acid value of the plant oil. The chemically modified electrode is a platinum electrode modified by perchlorate ion-doped polypyrrole. Electro-polymerization is carried at an electrochemical working station by adopting constant potential and circular scanning technology, so that a perchlorate ion-doped pyrrole polymer is formed on the surface of the platinum electrode. Pyrrole monomers are polymerized on the electrode by an electro-chemical method and doped with ions at the same time to ensure that the electrode has a catalytic effect on a reduction reaction of unsaturated fatty acids and conducts a current of the reaction simultaneously, so that the acid value of the plant oil can be calculated according to the value of the current. The modified platinum electrode prepared by the electro-polymerization by adopting the constant potential and circular scanning technology has high stability and high repeatability; and when the method is used for determining the acid value of the plant oil, the color and luster or the turbidity of an oil sample exert no interference with the determination of a voltammetric current, the required amount of the oil sample is relatively small, and the sensitivity and the accuracy are superior to those of the traditional titration and the potentiometric titration.

Description

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Claims

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Application Information

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Owner CHINA AGRI UNIV
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