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Method for detecting waste oil in qualified edible oil

A technology that is qualified for inspection and waste oil is applied in the preparation of material inspection products, sample preparation for testing, and food testing. Simple to use effects

Inactive Publication Date: 2009-03-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, due to the rise in the price of grain and oil, many unscrupulous traders are greedy for profit, and sell waste oil as edible oil or mix it into edible oil, which brings harm to the health of consumers and damages the interests of consumers. Therefore, it is necessary to Study a test method with strong applicability and simple operation to test whether the qualified edible oil is mixed with waste oil

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0014] Collect the oil layer floating on the surface from the leftovers recycling place in a canteen, heat it to 50°C, and after precipitation, separate the impurities and water in the lower part in the separatory funnel. Then reheat the oil to 70°C, add 5% salt water (made of deionized water) to wash, let stand and release the lower layer of water, then add boiling water for continuous washing until there is no jelly. Determination of the acid value of the oil, followed by alkali refining. During alkali refining, 16°Be' lye is used, and the lye is slowly added to the oil at 30°C, stirred until soap particles appear, and then precipitated for 4 hours to release the saponified liquid in the lower layer. Wash the upper layer of oil until it is not alkaline. Then carry out dehydration, decolorization and deodorization under vacuum state to obtain refined waste oil. Put 100ml of waste oil in a 250ml separatory funnel, add 100ml of deionized water, shake for 5min, let it stand fo...

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Abstract

The invention relates to a method for checking the waste oil of qualified edible oil, which utilizes food residue of catering trades as raw material and utilizes the processes of degumming, alkali refining, dewatering, decolorizing and deodorizing and the like to obtain refined waste oil. Since the waste oil is generated by adding the flavorings as salt and gourmet into cooked qualified edible oil, and the organic matter in cooking will decompose and generate ionize matters to improve the conductivity, the conductivity of water phase can be measured after the extraction of deionized water, the test result can be compared to judge if the qualified edible oil is doped with waste oil. The method has high practicality and simple operation.

Description

technical field [0001] The invention belongs to the field of agricultural product quality and safety inspection, and relates to a method for inspecting whether gutter oil is mixed in qualified edible oil. Background technique [0002] At present, due to the rise in the price of grain and oil, many unscrupulous traders are greedy for profit, and sell waste oil as edible oil or mix it into edible oil, which brings harm to the health of consumers and damages the interests of consumers. Therefore, it is necessary to To study a test method with strong applicability and simple operation to test whether the qualified edible oil is mixed with gutter oil. Contents of the invention [0003] The object of the present invention is to provide a method for checking whether waste oil is mixed with waste oil and its content in qualified edible oil. The method can quickly detect whether the qualified edible oil contains gutter oil and what the content is. [0004] The technical scheme of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/06G01N1/34G01N33/03
Inventor 杨晓京朱锐
Owner KUNMING UNIV OF SCI & TECH
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