Method for determining fatty aldehyde in drainage oil

A measurement method and technology of gutter oil, applied in the direction of measuring devices, instruments, scientific instruments, etc., to achieve the effect of sensitive judgment

Inactive Publication Date: 2014-06-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these patented methods can identify waste oil, some methods are cumbersome to operate, have many interference factors, and the process is relatively complicated, and the specific indicators for the identification and detection of hogwash oil are not clear.

Method used

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  • Method for determining fatty aldehyde in drainage oil
  • Method for determining fatty aldehyde in drainage oil
  • Method for determining fatty aldehyde in drainage oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Sample pretreatment: Add 500 mL of 10% NaOH to 300 mL of waste oil to remove its soaps, then add 10% NaCl solution to remove excess lye and accelerate the separation of oil and soap, heat 30 g of activated clay at 70 °C for 30 minutes to decolorize, and then Filter to remove activated clay, add 10 g MgSO 4 dehydration. 50 mL of refined waste oil was dissolved in 80 mL of n-hexane, and the sample was loaded on a 50 g treated silica gel column. First eluted with a mixed solution of 550 mL of n-hexane and ethyl acetate (10:1, V / V) to remove hydrophobic substances, then added 500 mL of ethanol for elution, and concentrated the two parts of the eluate to remove the solvent Reserved for later use.

[0049] Sample preparation: Take a mixture of n-hexane and ethyl acetate (10:1, V / V) to concentrate the eluent 1 mL, add 1 mL of absolute ethanol, then add 1 mL of dichloromethane, the sample is completely dissolved and diluted as a blank Sample. Take 1 mL of concentrated eluen...

Embodiment 2

[0053] 50 mL of the first-grade Luhua peanut oil was dissolved in 80 mL of n-hexane and loaded on a 50 g treated silica gel column. First elute with 550 mL of a mixed solution of n-hexane and ethyl acetate (10:1, V / V) to remove hydrophobic substances, then add 500 mL of ethanol for elution, and concentrate the two parts of the eluate to remove the solvent Reserved for later use.

[0054] Sample preparation: Take a mixture of n-hexane and ethyl acetate (10:1, V / V) to concentrate the eluent 1 mL, add 1 mL of absolute ethanol, then add 1 mL of dichloromethane, the sample is completely dissolved and diluted as a blank sample . Take 1 mL of concentrated eluent for ethanol elution, add 1 mL of absolute ethanol, add 1 mL of dichloromethane, and then add excess 0.5 mL of 2,4-dinitrophenylhydrazine as the actual sample.

[0055] Liquid chromatographic determination: a set of Shimadzu chromatograph, including one LC-10ATvp chromatographic pump, one 2487 multi-wavelength ultraviolet de...

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Abstract

The invention discloses a method for determining fatty aldehyde in drainage oil. The invention uses the specificity of the large amounts of fatty aldehyde contained in the waste oil; the waste oil is subjected to pretreatment and derivatization reaction with 2,4-dinitrophenylhydrazine to generate different 2,4-dinitrophenylhydrazone; and high performance liquid chromatography is used for detection. The method realizes determination of aldehydes in the waste oil (drainage oil) and at the same time can carry out efficient, simple and sensitive judgment on whether a commercial edible oil sample is laced with drainage oil.

Description

[0001] technical field [0002] The invention relates to a technology for detecting fatty aldehydes in waste oil (waste oil) by using a high-performance liquid chromatography method, and belongs to the technical field of food safety. [0003] Background technique [0004] Aldehyde compounds come from a wide range of sources and are quite harmful to the environment and human health. At present, domestic and foreign research on the detection of trace formaldehyde, acetaldehyde and other aliphatic aldehyde pollutants is mostly concentrated in the atmosphere, water and indoor environment, and the main methods used are spectrophotometry or colorimetry. There are very few research reports on the detection of aldehydes in food. The "Food Hygiene Law" and the Food Additives Management Measures stipulate that aldehydes are not allowed to be added during food processing. Some aldehydes are added during the processing of certain products, and even some waste oils are simply processe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/89
Inventor 董树清赵亮王利涛张志欣张霞郭勇
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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