Method for identifying abandoned kitchen oil

A technology of waste oil and kitchen, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that kitchen waste oil cannot be accurately identified and is not feasible, and achieve obvious social and economic benefits

Active Publication Date: 2012-09-19
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, it is still impossible to accurately identify kitchen waste oil at home and abroad.
For this reason, the Ministry of Health has successively collected 4 detection methods for kitchen waste oil, and the methods collected in the first 3 times have been proved to be unfeasible by practice.

Method used

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  • Method for identifying abandoned kitchen oil
  • Method for identifying abandoned kitchen oil
  • Method for identifying abandoned kitchen oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The identification of a suspected kitchen waste oil sample includes the following steps:

[0025] (1) Accurately weigh 5.00g (accurate to 0.01g) of a homogeneous oil sample (a suspected kitchen waste oil sample) into a 50mL polytetrafluoroethylene centrifuge tube, add 10mL acetonitrile, vortex extract for 5min, and keep the temperature at room temperature , then centrifuge at 4000r / min for 10min, take all the supernatant in a 100mL beaker; add 10mL acetonitrile to the residue, repeat the extraction once, centrifuge at 4000r / min for 10min, take the supernatant, combine the supernatant twice, and put in Concentrate to 1 mL by blowing nitrogen in a water bath at 50°C, and pass through a 0.22 μm filter membrane to obtain a sample solution for later use.

[0026] Preparation of standard solution: Prepare standard stock solutions of capsaicin and dihydrocapsaicin with a mass concentration of 1000 mg / L using methanol as a solvent, store in a brown volumetric flask at 4°C in th...

Embodiment 2

[0037] Take multiple batches of kitchen waste oils from areas with spicy people, such as Sichuan, Chongqing, Guizhou, Hunan, Hubei, etc., and test according to the method in Example 1. Capsicum was detected in these kitchen waste oils. Capsaicin or dihydrocapsaicin or both were detected.

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Abstract

The invention discloses a method for identifying abandoned kitchen oil, which comprises the following steps: weighting an oil sample; adding acetonitrile as an extracting agent for extracting the oil sample; concentrating extract liquor and then fixing column, thereby obtaining a sample solution; analyzing by injecting the sample solution into a liquid chromatography-mass spectrum / mass spectrum instrument, taking capsaicine and dihydro-capsaicine as standard substances, taking chromatographic peak retention time and two monitored ion pairs monitored through mass spectrum multi-reaction of thestandard substances as nature-determining basis, and confirming if the sample solution contains capsaicine and dihydro-capsaicine; and if yes, confirming the oil sample as the abandoned kitchen oil. The method provided by the invention is simple and practical, is an effective method for identifying the abandoned kitchen oil in the areas (such as Sichuan, Chongqing, Guizhou, Hunan, Hubei, and the like) where people like peppery food, is applied to the field of food detection and is obvious in social benefit and economic benefit.

Description

Technical field: [0001] The invention belongs to the field of organic matter analysis and detection, and in particular relates to a method for identifying kitchen waste oil. Background technique: [0002] Kitchen waste oil generally refers to all kinds of discarded low-quality edible oils, mainly kitchen waste oils and oils produced after processing and refining low-quality animal skins, meat, and viscera. Kitchen waste oil mainly includes swill oil (swill oil) and old frying oil. In a narrow sense, kitchen waste oil refers to the greasy floating matter caught in the gutter grease traps of hotels, restaurants, etc., which is in the form of dark brown liquid paste with a sour and foul smell; swill oil refers to the collection of leftovers and leftovers (commonly known as swill) After refining, the upper layer of slick oil is golden yellow to dark red and has a sour smell; old frying oil refers to oil that has been repeatedly used for frying food at high temperatures, has und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 吴惠勤黄晓兰陈江韩罗辉泰黄芳林晓珊朱志鑫马叶芬邓欣
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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