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Method for directly detecting drainage oil by using paramagnetic resonance wave spectroscopy

A technology of electron paramagnetic resonance and gutter oil, applied in the direction of using electron paramagnetic resonance for analysis, etc., can solve problems such as poor detection effect

Inactive Publication Date: 2012-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the same detection effect is not good for oil products with less adulterated content

Method used

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  • Method for directly detecting drainage oil by using paramagnetic resonance wave spectroscopy
  • Method for directly detecting drainage oil by using paramagnetic resonance wave spectroscopy
  • Method for directly detecting drainage oil by using paramagnetic resonance wave spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1. Preparation of simulated waste oil: 5mL range hood filter oil was placed in a 250°C oil bath and heated for 12 hours, and a 0.5mL oil sample was taken for testing. The test temperature was 70-130°C, and the test was performed once every 20°C ( attached figure 1 ), and fresh oil sample (Arowana blend oil) (attached figure 2 ) comparison, after the comparison, it was found that the free radical characteristic peak of the waste oil sample continued to increase, while the signal of the fresh oil sample suddenly decreased at 110°C, and disappeared at 130°C.

Embodiment 2

[0019] Example 2. Select Fulinmen Grain Blending Oil, Guchuan Soybean Oil, Fire Bird Blending Oil, Arowana Blending Oil, Arowana Corn Oil, Longda Peanut Oil, Luhua 5S Pressed Peanut Oil, Arowana Sunflower Seed Oil, Arowana Sesame oil, Dashu brand extra virgin olive oil, and Laojingfang pure walnut oil all have very obvious reduction or disappearance of free radical signals when the temperature rises to 110°C (attached table 1).

Embodiment 3

[0020] Example 3. Mix waste oil and fresh oil (Arowana blended oil) at a volume ratio of 1:50, use the internal standard method, keep the test parameters and detection positions unchanged, and compare the changes in the signal at g=2.04 before and after heating and Signal change at g=2.000 (attached Figure 4 ). It was found that the signal at g=2.04 increased after being heated in an oil bath at 100°C for 16 hours, while the signal at g=2.000 decreased, while the signal at g=2.04 of fresh oil (Arowana blended oil) changed under the same conditions small, while the signal at g=2.000 increases.

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Abstract

The invention relates to a drainage oil detecting method. Free radicals in an oil product are detected by using an electronic paramagnetic resonance wave spectrometer, and whether the oil product is drainage oil or whether drainage oil is doped in the oil product is judged by comparing the variation trend of the quantity of free radicals before and after temperature change. The method for in-situ test of a sample is wide in applicability, has a good detection effect on various oil products, and can be used for directly detecting whether the drainage oil is doped in the edible oil products.

Description

technical field [0001] The invention relates to a detection method of waste oil. Background technique [0002] Waste oil broadly refers to all kinds of discarded low-quality edible oils, mainly kitchen waste oils, and also includes a type of oil produced after processing and refining low-quality animal skins, meat, and viscera. Kitchen waste oil includes three categories: gutter oil (narrow sense), swill oil and old frying oil. The kitchen waste oil is deslagged by heating, decolorized by heating, and deodorized by high-temperature vacuum to become secondary oil. Secondary oil usually flows into the food and catering industry after blending with some new oil. Due to different sources of secondary oil and different degrees of refining and processing, not only essential fatty acids such as linoleic acid and linolenic acid, but also oil accompanying substances such as phytosterols and tocopherols are greatly reduced, and their nutritional value is significantly reduced. Toxi...

Claims

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Application Information

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IPC IPC(8): G01N24/10
Inventor 杨海军李勇蒋敏
Owner TSINGHUA UNIV
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