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A rapid detection method for the content of polar components in frying oil

A technology of polar components and detection methods, applied in the field of oils and fats, can solve the problems of large amount of organic solvent, long analysis time, complicated operation, etc., and achieve the effect of improving the accuracy of information

Active Publication Date: 2017-05-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, column chromatography has disadvantages such as long analysis time, large amount of organic solvent, and complicated operation. It is very necessary to develop rapid detection technology.

Method used

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  • A rapid detection method for the content of polar components in frying oil
  • A rapid detection method for the content of polar components in frying oil
  • A rapid detection method for the content of polar components in frying oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First-class soybean oil: purchased in supermarkets;

[0033] French fries: purchased from a supermarket, 40×7.2×7.2mm;

[0034] Frequency-domain dielectric spectrum tester: E5062B network analyzer, Agilent, USA;

[0035] Digital thermometer: LR4210, Yokogana, Japan.

[0036] Use 10 liters of commercial grade soybean oil to fry French fries continuously, heat to 168.3°C and maintain 168.3±5°C.

[0037] French fries of a set size and equal quality were put into a pan for frying, frying for 12 hours a day for 10 days, and samples were taken every 6 hours. The collected samples were transferred to stoppered vials and stored at 4°C.

[0038] Add the collected frying oil sample to the detection pool, insert the detection probe, and when the detection probe of the frequency domain dielectric spectrum tester is put into the detection pool of the frying oil sample to be tested, ensure that the detection probe is not in contact with the wall of the detection pool. Contact eac...

Embodiment 2

[0049] Palm oil: purchased in supermarkets;

[0050] Chicken nuggets: purchased from a supermarket, 40×30×10mm;

[0051] Frequency-domain dielectric spectrum tester: E5062B network analyzer, Agilent, USA;

[0052]Digital thermometer: LR4210, Yokogana, Japan.

[0053] Use about 10 liters of commercially available palm oil to fry chicken nuggets continuously, heat to 182.5°C and maintain 182.5±5°C.

[0054] Put chicken nuggets of set size and equal quality into the pan for frying, frying for 12 hours a day for 10 days, sampling every 6 hours. The collected samples were transferred to stoppered vials and stored at 4°C.

[0055] Add the collected frying oil sample to the detection pool, insert the detection probe, and when the detection probe of the frequency domain dielectric spectrum tester is put into the detection pool of the frying oil sample to be tested, ensure that the detection probe is not in contact with the wall of the detection pool. Contact each other, make the f...

Embodiment 3

[0066] Blending oil: purchased in supermarkets;

[0067] Fish steak: purchased from a supermarket, 70×60×13mm;

[0068] Frequency-domain dielectric spectrum tester: E5062B network analyzer, Agilent, USA;

[0069] Digital thermometer: LR4210, Yokogana, Japan.

[0070] Use about 10 liters of commercially available blended oil to fry fish fillets continuously, heat to 182.5°C and maintain 182.5±5°C.

[0071] Fish fillets with a set size and equal quality were put into a pan for frying, and they were fried for 12 hours a day for 10 days, and samples were taken every 6 hours. The collected samples were transferred to stoppered vials and stored at 4°C.

[0072] Add the collected frying oil sample to the detection pool, insert the detection probe, and when the detection probe of the frequency domain dielectric spectrum tester is put into the detection pool of the frying oil sample to be tested, ensure that the detection probe is not in contact with the wall of the detection pool. ...

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Abstract

The invention discloses a method for rapidly detecting the content of polar components in frying oil. The method comprises the following steps: taking linear measuring points of a to-be-detected frying oil sample by utilizing a frequency domain dielectric spectroscopy tester, obtaining a compound dielectric constant of the frying oil sample, wherein the compound dielectric constant comprises a real part epsilon' and an imaginary part epsilon'', and forming dielectric constant-frequency and dielectric loss-frequency spectrums; and performing spectrum unfolding, fitting the actually measured dielectric constant, and judging the content of the polar components in frying oil according to an extracted characteristic parameter tau. According to the method disclosed by the invention, the content of the polar components in the frying oil can be rapidly measured in case of a nondestructive sample, and a reliable basis is provided for accurately evaluating the safety of fried foods.

Description

technical field [0001] The invention belongs to the technical field of fats and oils, and in particular relates to a rapid detection method for the content of polar components in frying oil based on frequency domain dielectric spectrum. Background technique [0002] Fried food is very common in our country, and the vegetable oil used for frying exceeds 1 million tons every year. Polar components (PC) are components that are more polar than normal vegetable oils produced during high-temperature frying. Polar components in frying oil directly affect the safety, health and nutrition of fried foods. The national standard GB7120 stipulates that the content of polar components should not be higher than 27%, and the effective and rapid detection of this index is very important to ensure the safety of fried food. [0003] Regarding the detection of polar components in frying oil, column chromatography is generally accepted by domestic and foreign standards. However, column chromat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 刘睿杰王兴国金青哲李徐常明杨培金
Owner JIANGNAN UNIV
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