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Method for nondestructive detection of water and fat contents of yellow croaker

A technology of fat content and determination method, which is applied in measurement devices, analysis materials, analysis by nuclear magnetic resonance, etc., to achieve the effect of rapid detection

Inactive Publication Date: 2016-05-04
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies on the detection of water and fat content in intact yellow croaker using low-field NMR technology have not been reported

Method used

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  • Method for nondestructive detection of water and fat contents of yellow croaker
  • Method for nondestructive detection of water and fat contents of yellow croaker
  • Method for nondestructive detection of water and fat contents of yellow croaker

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Experimental program
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Effect test

Embodiment 1

[0033] The magnetic resonance relaxation spectrum of embodiment 1 yellow croaker sample

[0034] Take a commercially available fresh yellow croaker sample, set three parallel samples, the mass is 25.24±9.29g, rinse with clean water repeatedly, and dry the surface moisture with filter paper. Put the yellow croaker samples in the center of the permanent magnetic field radio frequency coil of the nuclear magnetic resonance imaging analyzer (the model is MiniMR-Rat), and use the Carr-Purcell-Meiboom-Gill (CPMG) sequence to measure, and the sampling parameters are set to: repeat sampling while waiting Tw: 3000ms, analog gain RG1: 15, digital gain DRG1: 3, preamplifier gain PRG: 1, cumulative times NS: 8, number of echoes NECH: 1000, delay DL1: 0.5ms, number of sampling points TD: 208496 , the signal was collected three times for each sample, and the average value was taken. Finally, MultiExpInvAnalysis software was used for multi-exponential fitting to obtain the transverse relaxat...

Embodiment 2

[0036] Embodiment 2: the mensuration of yellow croaker moisture and fat content (direct method)

[0037] Determination of moisture: Mince the yellow croaker sample, then directly dry it in a blast drying oven for 48 hours to reach a constant weight, weigh the weight difference before and after drying the yellow croaker sample, and calculate the moisture content.

[0038] Determination of fat: Mince the yellow croaker sample and put it in a vacuum freeze dryer to dry for 48 hours, then use a pulverizer to crush the dried yellow croaker sample to micron-sized powder, wrap the crushed yellow croaker sample with filter paper, and put it into the Soxhlet Then add 150ml of petroleum ether to the round bottom flask, extract at 90°C for 6h, remove the petroleum ether by rotary evaporation, and then vacuum dry for 2h to completely volatilize the residual petroleum ether in the oil to obtain the fat in the yellow croaker sample content.

[0039] Table 1 lists the maximum value, minimum...

Embodiment 3

[0042] Example 3: Establishment of prediction model for moisture and fat content of yellow croaker and model evaluation

[0043] Using Principal Component Regression (PCR) and Partial Least Squares Regression (PLSR) modeling, the data of 1000 CPMG echo peak points collected from the sample is used as the independent variable X, and the dependent variable Y is the water or fat content of the yellow croaker. Based on TheUnscrambler The software uses PCR and PLSR to establish a correlation model between X and Y.

[0044] figure 2 and image 3 The relationship diagram (A) and the predicted scatter distribution diagram (B) of the PCR model residual variance and principal component scores of water and fat in yellow croaker samples, respectively. The optimal number of factors for establishing a prediction model can be determined through the residual variance scatter diagram, from figure 2 A and image 3 A It can be seen that when PCR is used to establish the prediction model, t...

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Abstract

The invention provides a method for nondestructive detection of water and fat contents of yellow croaker. The method comprises 1, yellow croaker sample detection: acquiring a transverse relaxation signal through a CPMG sequence so that a yellow croaker sample transverse relaxation spectrum is obtained, 2, determination of yellow croaker water and fat contents, 3, building of yellow croaker water and fat content prediction models: building prediction models through the T2 relaxation spectrum as an independent variable and water and fast contents as dependent variables, and 4, signal data analysis and processing. The method researches correlation of the spectrum and ingredients, utilizes yellow croaker low field nuclear magnetic resonance relaxation data as a research object and yellow croaker water and fast contents as indexes to build the yellow croaker water and fat content PCR and PLSR prediction models and realizes fast detection of water and fat contents of the yellow croaker.

Description

technical field [0001] The invention belongs to the field of analysis and measurement of materials, and in particular relates to an analysis and measurement method based on nuclear magnetic resonance. Background technique [0002] The yellow croaker belongs to the fish class, the croaker family, and is divided into large yellow croaker (Pseudosciaenacrocea) and small yellow croaker (Psendosciaenapolyactis), which are respectively one of the four major marine species in my country. Large yellow croaker is also called big first, golden dragon, cucumber fish, red melon, golden dragon, sweet-scented osmanthus yellow croaker, king fish, large yellow croaker; small yellow croaker is also called plum, plum fish, small king fish, small first, small spring fish, small cucumber fish, thick scale Aberdeen, flower fish. In recent decades, yellow croaker has been an important economic fishery resource in China, Korea and Japan, with an annual output of more than 300,000 tons (Conservati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/082
Inventor 谭明乾耿少特藏秀迟琪
Owner DALIAN POLYTECHNIC UNIVERSITY
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