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Method for determination of oil content and water content of soybeans by using low field nuclear magnetic resonance technology

A technology of low-field nuclear magnetic resonance and measurement methods, which is applied in the fields of analysis by nuclear magnetic resonance, measurement devices, and material analysis through resonance, and can solve the problems of damage to samples in pre-processing steps, and achieve simple models, good data repeatability, and The effect of reducing manual operation costs and energy consumption

Inactive Publication Date: 2016-10-12
DALIAN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a fast and non-destructive method for simultaneous determination of soybean oil and water content in view of the shortcomings of cumbersome pretreatment steps and damaged samples in the prior art

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  • Method for determination of oil content and water content of soybeans by using low field nuclear magnetic resonance technology
  • Method for determination of oil content and water content of soybeans by using low field nuclear magnetic resonance technology
  • Method for determination of oil content and water content of soybeans by using low field nuclear magnetic resonance technology

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Embodiment

[0041] 1. NMR relaxation spectrum analysis of soybean samples

[0042] Soybeans purchased from the market in Tonghua, Jilin were randomly divided into ten groups. Using NMI20NMR nuclear magnetic resonance analyzer, using multi-pulse spin echo sequence (Carr-Purcell-Meiboom-Gill (CPMG) sequence), measure the soybean sample transverse relaxation time T2, the parameters are set as: 90-degree pulse width P1: 4μs, 180 Pulse width P2: 8μs, re-sampling waiting time Tw: 2500ms, analog gain RG1: 8 digital gain DRG1: 3, preamplifier gain PRG: 1, NS: 16, NECH: 3000, receiver bandwidth SW: 200KHz, start The sampling time control parameters RFD: 0.002ms, time delay DL1: 0.1ms for nuclear magnetic resonance signal acquisition, get the CPMG attenuation spectrum of each sample ( figure 1 ). Depend on figure 1 Five representative soybean sample decay curves are visible. Then a one-dimensional inverse Laplace algorithm is used as the transverse relaxation time T 2 The inversion algorithm (...

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Abstract

The invention discloses a method for measuring soybean oil and water content using low-field nuclear magnetic resonance technology. The specific steps are as follows: measure the oil content of the sample, and measure the water content of the sample; use the low-field nuclear magnetic resonance technology CPMG sequence to measure the soybean sample, and use one-dimensional reverse Lapp Rass algorithm was used to process the relaxation spectrum data of each soybean sample; the actual oil and water content of each soybean sample was corresponding to the relaxation spectrum data; the chemometric method was used for fitting to obtain the prediction model of soybean oil and water content Using the same method to detect and process the soybeans to be tested to obtain the relaxation spectrum data of the soybean samples to be tested; to call the established soybean oil and water content prediction model to obtain the determination of the oil and water content of the soybeans to be tested. The method of the present invention does not require complex pretreatment, does not destroy samples, and conforms to the development direction of green chemistry; it can realize rapid detection and analysis of soybean oil and water content within a few minutes, which is faster and more efficient.

Description

technical field [0001] The invention relates to the field of detection of soybean oil and water content, in particular to a method for measuring soybean oil and water content by using low-field nuclear magnetic resonance technology. Background technique [0002] Soybean, also known as soybean, is one of the important economic crops in China. It has high nutritional value. Among the most respected by nutritionists. In addition, soybeans are the most commonly used oil crops in my country. Soybean oil can be obtained from soybeans by pressing and leaching. Therefore, the oil content of soybeans is often used as one of the important criteria for seed selection. At the same time, the moisture content of soybeans has strict requirements in soybean storage. In summary, soybean oil and water content is an important criterion for soybean variety selection. [0003] In recent years, NMR has been widely used in many fields as an important modern analysis method. According to the pr...

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/082
Inventor 谭明乾李艳茹李永韩茹
Owner DALIAN POLYTECHNIC UNIVERSITY
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