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Method for distinguishing edible oil from swill-cooked dirty oil by electrochemical fingerprints

A technology of fingerprint spectrum and edible oil, applied in the field of identifying edible oil and waste oil, can solve the problems of inability to detect the waste oil, the spectrum measurement is difficult to succeed, and the experimental steps are complicated, and the identification results are objective, accurate and reliable, and the detection cost is low. , analyze the effect of simple and fast

Inactive Publication Date: 2014-09-03
SOUTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main methods for identifying edible oil and gutter oil include sensory identification method and physical and chemical index identification method. The sensory identification method is identified through five aspects: seeing, smelling, tasting, listening, and asking. It is easily affected by human subjective factors and has relatively low reliability. Poor; the physical and chemical index detection method of edible oil includes acid value, peroxide value, leaching oil solvent residue, free phenol (cottonseed oil), total arsenic, lead, aflatoxin, benzopyrene, and pesticide residue, a total of 9 indicators, but Even the 9 indicators of the oil refined from waste oil may be qualified, and it is impossible to carry out discrimination detection for waste oil; in recent years, it has been reported to use nuclear magnetic, infrared, ultraviolet or chromatography and other instrument analysis techniques to identify edible oil and Waste oil, but because these methods or detection process take a long time, the experimental steps are complicated, and the equipment used is expensive, the data characteristics and reliability are poor
The Chinese patent with the publication number CN 102565169 A discloses a method for identifying vegetable oils using electrochemical fingerprints, specifically: simply adding vegetable oils to an oscillating reaction system for fingerprint determination, using the relative standard of electrochemical fingerprints characteristic parameters However, using this method for detection, the vegetable oil will accumulate on the surface of the electrode and affect the electromotive force detection. Make full use of diversity features for classification, resulting in poor reliability of identification results

Method used

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  • Method for distinguishing edible oil from swill-cooked dirty oil by electrochemical fingerprints
  • Method for distinguishing edible oil from swill-cooked dirty oil by electrochemical fingerprints
  • Method for distinguishing edible oil from swill-cooked dirty oil by electrochemical fingerprints

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The method for distinguishing edible oils of different varieties by using electrochemical fingerprints, comprising the steps of:

[0026] A. Obtaining fingerprints

[0027] Take 1.00mL rapeseed oil (Arowana), sunflower oil (Duoli) and peanut oil (Luhua) and 1.00mL0.25mol / L sodium dodecylbenzenesulfonate solution into the B-Z shaking system, control the solution temperature The temperature is 37.00±0.05℃, using platinum electrode as indicator electrode and double-salt bridge saturated calomel electrode as reference electrode, to obtain the change curve of potential with time, that is, to obtain rapeseed oil (Arowana), sunflower oil (Duoli) and the electrochemical fingerprint of peanut oil (Luhua), such as figure 1 Shown; where the B-Z oscillation system consists of 20.0mL2.0mol / LH 2 SO 4 , 20.0mL0.7mol / L malonic acid, 5.00mL5.0×10 -4 mol / LNaBr, 2.00mL0.01mol / L (NH 4 ) 4 Ce(SO 4 ) 4 and 1.00mL1.0mol / LNaBrO 3 composition;

[0028] B. Identification of samples to ...

Embodiment 2

[0035] The method for utilizing the electrochemical fingerprint spectrum to identify waste oil may further comprise the steps:

[0036] A. Obtaining fingerprints

[0037] Take 1.00mL rapeseed oil (Arowana), sunflower oil (Doli), peanut oil (Luhua), gutter oil, rapeseed oil to be identified, sunflower oil to be identified and peanut oil to be identified and 1.00mL0.25mol / L sodium dodecylbenzenesulfonate solution is added to the B-Z oscillation system, the constant temperature of the oscillation system is controlled to be 37.00±0.05°C, the platinum electrode is used as the indicator electrode, and the double-salt bridge saturated calomel electrode is used as the reference electrode. The change curve of rapeseed oil (Arowana), sunflower oil (Doli) and peanut oil (Luhua), waste oil, rapeseed oil to be identified, sunflower oil to be identified and peanut oil to be identified electrochemical fingerprints Atlas; the electrochemical fingerprints of waste oil, rapeseed oil to be ide...

Embodiment 3

[0045] The method for identifying different kinds of edible oils and gutter oils by means of electrochemical fingerprints comprises the following steps:

[0046] A. Obtaining fingerprints

[0047] Take 2.00mL rapeseed oil (Arowana), sunflower oil (Doli), peanut oil (Luhua) and gutter oil and 1.00mL0.5mol / L sodium dodecylbenzenesulfonate solution into the B-Z shaking system, Control the temperature of the solution at 50.00±0.05°C, use the platinum electrode as the indicator electrode, and the Ag / AgCl electrode as the reference electrode to obtain the change curve of the potential with time, that is, to obtain the electrochemical fingerprint of the edible oil sample; the B-Z oscillation system is composed of 20.0 mL2.0mol / LH 2 SO 4 , 20.0mL0.7mol / L malonic acid, 5.00mL5.0×10 -4 mol / LNaBr, 2.00mL0.01mol / L (NH 4 ) 4 Ce(SO 4 ) 4 and 1.00mL1.0mol / LNaBrO 3 composition;

[0048] B. Identification of samples to be tested

[0049] Extract characteristic parameters from the ele...

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Abstract

The invention discloses a method for using electrochemical fingerprints to identify edible oil and waste oil, which comprises the following steps: taking different kinds of edible oil, waste oil and samples to be tested, respectively adding them to a B-Z oscillation system at a constant temperature, and then adding Surfactant, then use platinum electrode as indicator electrode, double salt bridge saturated calomel electrode or Ag / AgCl electrode as reference electrode, get the electrochemical fingerprint of edible oil, waste oil and sample to be tested; from the electrochemical fingerprint Extract characteristic data from the mixture, use the pattern recognition method to mix them and then classify them. Using the method of the present invention, the problems of edible oil being insoluble in water, poor reaction reproducibility, and interference spectrum detection are solved. The operation is simple, the cost is low, and the analysis is fast. It can make full use of the diverse fingerprint characteristics of edible oil, objectively, accurately and reliably identify edible oil and waste oil, and provide a basis for comprehensively controlling the quality and safety of edible oil.

Description

technical field [0001] The invention relates to the field of food detection, in particular to a method for identifying edible oil and gutter oil by using electrochemical fingerprints. Background technique [0002] Edible oil is an indispensable food in people's life, and its quality is directly related to people's health. There are many varieties of edible oil, the most common are rapeseed oil, peanut oil, soybean oil, corn oil, sesame oil, olive oil, tea seed oil, sunflower oil, cottonseed oil, walnut oil and so on. Waste oil generally refers to all kinds of low-quality oils that exist in daily life, such as recycled cooking oil, repeatedly used frying oil, etc. The biggest source of gutter oil is the grease trap in the sewers of large urban hotels, which is low in cost and returns to our dining tables only through simple processing. The quality and nutritional value of different types of oil are not the same, and their prices also vary greatly. Waste oil is extremely har...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
Inventor 张明晓李永玲陈雯李聪
Owner SOUTHWEST UNIV
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