Method for identification and content determination of walnut oil

A walnut oil content technology, applied in the preparation of test samples, fluorescence/phosphorescence, material excitation analysis, etc., can solve problems such as difficult to distinguish, walnut oil detection, no walnut oil, etc., to achieve high measurement accuracy, rapid analysis, The effect of meeting the detection requirements

Inactive Publication Date: 2011-01-05
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The sensory properties of walnut oil and soybean oil are relatively similar, and it is difficult to distinguish them with the naked eye. In addition, walnut oil itself lacks the special aroma of dried walnuts, making it difficult to distinguish walnut oil and soybean oil from the taste
At present, there are mainly two types of walnut oil counterfeiting problems in the market: 1. Soybean oil is pretended to be or partly adulterated to make pure walnut oil; no walnut o

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  • Method for identification and content determination of walnut oil
  • Method for identification and content determination of walnut oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) Make mixed oil samples. The pure walnut oil and pure soybean oil made by pressing are mixed in different proportions to make 15 mixed oil samples, and the contents of walnut oil are 0, 2%, 10%, 18%, 26%, and 34% by volume respectively , 42%, 50%, 58%, 66%, 74%, 82%, 90%, 98%, 100%.

[0015] 2) Make test samples. The mixed oil sample is dissolved in n-hexane to become a test sample, and the mixed oil content in n-hexane is 1% (volume percentage).

[0016] 3) The fluorescence spectra of pure walnut oil, pure soybean oil and mixed oil samples were measured by simultaneous fluorescence method. The parameters of the instrument and equipment are: the scanning wavelength range is 250-700nm, the difference between the excitation wavelength and the emission wavelength is 20nm, the slit width is 7nm, and the scanning speed is 300nm / min.

[0017] 4) Spectral data analysis and processing. The fluorescence spectrum data obtained in step 3) was processed by the partial least s...

Embodiment 2

[0022] 1) Make mixed oil samples. The pure walnut oil and pure soybean oil made by pressing are mixed in different proportions to make 15 mixed oil samples, and the contents of walnut oil are 0, 2%, 10%, 18%, 26%, and 34% by volume respectively , 42%, 50%, 58%, 66%, 74%, 82%, 90%, 98%, 100%.

[0023] 2) Make test samples. The mixed oil sample is dissolved in n-hexane to become a test sample, and the mixed oil content in n-hexane is 1% (volume percentage).

[0024] 3) The fluorescence spectra of pure walnut oil, pure soybean oil and mixed oil samples were measured by simultaneous fluorescence method. The parameters of the instrument and equipment are: the scanning wavelength range is 250-700nm, the difference between the excitation wavelength and the emission wavelength is 40nm, the slit width is 7nm, and the scanning speed is 200nm / min.

[0025] 4) Spectral data analysis and processing. The fluorescence spectrum data obtained in step 3) is processed by the partial least sq...

Embodiment 3

[0031] 1) Make mixed oil samples. The pure walnut oil and pure soybean oil made by pressing are mixed in different proportions to make 15 mixed oil samples, and the contents of walnut oil are 0, 2%, 10%, 18%, 26%, and 34% by volume respectively , 42%, 50%, 58%, 66%, 74%, 82%, 90%, 98%, 100%.

[0032] 2) Make test samples. The mixed oil sample is dissolved in n-hexane to become a test sample, and the mixed oil content in n-hexane is 1% (volume percentage).

[0033] 3) The fluorescence spectra of pure walnut oil, pure soybean oil and mixed oil samples were measured by simultaneous fluorescence method. The parameters of the instrument and equipment are: the scanning wavelength range is 250-700nm, the difference between the excitation wavelength and the emission wavelength is 80nm, the slit width is 7nm, and the scanning speed is 400nm / min.

[0034] 4) Spectral data analysis and processing. The fluorescence spectrum data obtained in step 3) is processed by the partial least squa...

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Abstract

The invention relates to a method for identification and content determination of walnut oil, which mainly comprises the following operating steps of: (1) manufacturing a sample of mixed oil; (2) manufacturing a detection sample; (3) rapidly measuring the fluorescence spectra of pure walnut oil, pure soybean oil and the detection sample of the mixed oil by using a synchronous fluorescence method; and (4) analyzing and processing spectrum data. The method has easy and simple operation and good effect, the rapid detection of walnut oil content in the mixed sample of the walnut oil and the soybean oil can be realized, and the method is applicable to the quality control field of pure walnut oil and walnut blend oil.

Description

technical field [0001] The invention relates to a method for authenticity identification and content determination of walnut oil. Background technique [0002] Walnut (Juglans regia L.) has another name called walnut, belongs to the genus Juglans walnut, and is one of the four largest dry fruits in the world. Walnut oil is rich in nutrients, and the content of unsaturated fatty acids is as high as more than 90%, especially the content of linoleic acid and linolenic acid is the most in edible oil varieties. Studies have shown that walnut oil has good health care effects, and the polyunsaturated fatty acids rich in it have good health care and therapeutic effects on cardiovascular and cerebrovascular diseases. Linoleic acid can significantly reduce serum cholesterol levels, while linolenic acid can significantly reduce triglyceride levels. At the same time, walnut oil can remove free radicals in the body that cause aging of the body and enhance the body's antioxidant capacit...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N1/38
Inventor 葛锋陈朝银刘迪秋
Owner KUNMING UNIV OF SCI & TECH
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