Method for rapid detection and authenticity identification of fatty acid of racy camellia oil by near infrared transmission spectroscopy (NITS)

A transmission spectrum and near-infrared technology, applied in the field of edible vegetable oil quality analysis, can solve the problem of relatively few researches on tea oil adulteration detection.

Inactive Publication Date: 2011-11-23
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0007] In the aspect of oil product identification technology by near-infrared spectroscopy, most of the research is...

Method used

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  • Method for rapid detection and authenticity identification of fatty acid of racy camellia oil by near infrared transmission spectroscopy (NITS)
  • Method for rapid detection and authenticity identification of fatty acid of racy camellia oil by near infrared transmission spectroscopy (NITS)
  • Method for rapid detection and authenticity identification of fatty acid of racy camellia oil by near infrared transmission spectroscopy (NITS)

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Embodiment 1

[0053] A near-infrared transmission spectrum (NITS) rapid detection of original tea oil fatty acids and a counterfeit method, characterized in that the Fourier transform near-infrared transmission spectrum analysis technology to determine oleic acid, linoleic acid, palmitic acid, stearic acid in different varieties of tea oil acid and total unsaturated fatty acid content, and rapid identification of tea oil mixed with other edible vegetable oils, consists of the following steps:

[0054] The first step is the selection of high-quality Camellia oleifera varieties

[0055] Select high-quality varieties with an oil content of 30%-60% from more than 130 camellia seed varieties, including 65%-85% oleic acid, 5%-20% linoleic acid, and 3%-15% palmitic acid , stearic acid content 1%-5%;

[0056] The second step is the establishment of the NITS model of each fatty acid in camellia oil

[0057] Collect 90-140 different camellia oil samples, such as 90, 100, 110, 120, 130, and 140 samp...

Embodiment 2

[0069] The determination of the oil content of different varieties of Camellia oleifera seeds in embodiment 2

[0070] Grind the dried Camellia oleifera seeds into powder (with seed husks, the water content of the sample is less than 10%), weigh a certain amount of Camellia oleifera seed powder, and record the weight m 0 . Put it into the filter paper tube, insert the absorbent cotton into the upper part, compress the sample, and put it into the extractor. Add 180mL of petroleum ether (60°C-90°C) into the extraction bottle, extract at 80°C for 6h, evaporate the extract to empty and concentrate the solvent to obtain camellia oil, weigh the oil in m 1 . Calculate the oil content w=m of the corresponding variety 1 / m 0 .

[0071] This embodiment selects different varieties in Yunnan, Jiangxi, Zhejiang and other places, and the results are shown in Table 2 and Figure 5 . There are 26 varieties of Camellia oleifera seeds whose oil content is below 30%, 27 varieties of 30% t...

Embodiment 3

[0072] The composition of fatty acid in the different kinds of camellia oils measured by gas chromatography in embodiment 3

[0073] According to the sample prepared in Example 2, the sample was pretreated with methyl esterification. The varieties selected in this example include Guangxi (Lingyun, Liuzhou Rongshui, Fangchengdongzhong, Baise, Fengshan, Rong'an, Tianyang, Nandan, common Camellia oleifera), white camellia oil, safflower camellia oil, Yunnan Funingyan 129 samples including 1-120 samples from North Korea and Jiangxi (as shown in Table 2), and 9 samples of Camellia oleifera from Tengchong, Yunnan. Take a small amount of camellia oil sample and drop it in a 10mL test tube, add 2mL 0.5mol / L NaOH-CH 3 OH, shake well, put it in a 60°C water bath for methyl esterification for 30min, take it out and add 5mL of n-hexane, shake well, take out the supernatant after standing still, and carry out GC chromatographic analysis.

[0074] GC analysis conditions: chromatographic c...

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Abstract

The invention discloses a method for rapid detection and authenticity identification of fatty acid of racy camellia oil by near infrared transmission spectroscopy (NITS). The method comprises the steps of: screening high quality varieties with oil content of 30%-60% from more than 130 camellia seed varieties, wherein in the camellia oil, the content of oleinic acid is 65%-85%, the content of linoleic acid is 5%-20%, the content of palmitic acid is 3%-15%, and the content of stearic acid is 1%-5%; establishing a near infrared transmission spectroscopy (NITS) model of the main fatty acids (oleinic acid, linoleic acid, palmitic acid, stearic acid and total unsaturated fatty acid) with a partial least squares (PLS) method by adopting the Fourier near infrared transmission spectroscopy (NITS), wherein the determination coefficients of the correction models of the oleinic acid, the linoleic acid and the palmitic acid respectively are 0.93446, 0.96538 and 0.88789, and the determination coefficients of cross validation respectively are 0.91987, 0.95755 and 0.84447; further verifying accuracy and reliability of five NIRS (Near Infrared Reflectance Spectroscopy) models by external verification so as to obtain related coefficients of the external verification, which respectively are 0.9424, 0.9682, 0.8862, 0.6834 and 0.7587; and evaluating doped camellia oil by establishing the NIRS model of binary system miscella of the camellia oil. The method is applicable to rapid measurement of the content of main fatty acids of the camellia oil and the doped camellia oil, has the characteristics of simplicity, convenience, rapidness and economy, and is suitable for industrial application.

Description

technical field [0001] The invention relates to the field of quality analysis of edible vegetable oils, in particular to a method for rapid detection of fatty acids in original camellia oil by near-infrared transmission spectrum and a counterfeit identification method. Background technique [0002] Camellia oleifera is an excellent native tree species unique to China. Together with olive, oil palm and coconut, it is listed as the world's four largest woody oil plants. Camellia oil is the edible oil strongly advocated and promoted in the "Outline of China's Food Structure Reform and Development Plan", and it is also the health care vegetable edible oil first recommended by the International Food and Agriculture Organization. Camellia oil is mainly composed of oleic acid, linoleic acid and a small amount of saturated fatty acid. Its composition is similar to that of olive oil known as the "Queen of Vegetable Oils". The unsaturated fatty acid content is as high as 90%, of whic...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01N21/3577G01N21/359
Inventor 王成章原姣姣陈虹霞叶建中周昊
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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