Method for measuring natural rubber content in plant and LED near-infrared spectrometer for measurement

A near-infrared spectrometer and natural rubber technology, which is applied in the field of LED near-infrared spectrometers for measurement, can solve the problem of not being able to meet the rubber content well, and achieve the effects of humanized interactive interface, small loss and simple operation.

Inactive Publication Date: 2019-06-25
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the highest value of the near-infrared characteristic absorption peak of natural rubber is at 1940nm-2200nm, and the

Method used

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  • Method for measuring natural rubber content in plant and LED near-infrared spectrometer for measurement
  • Method for measuring natural rubber content in plant and LED near-infrared spectrometer for measurement
  • Method for measuring natural rubber content in plant and LED near-infrared spectrometer for measurement

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Experimental program
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Effect test

Embodiment 1

[0057] 1. Preparation of standard latex samples: take dandelion latex and ammonia water to be configured into latex solution of corresponding concentration, and then dilute to dry gel concentration 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1 concentration gradient (mg / ml) a total of 10 samples, let stand for 5min.

[0058] 2. Measure the prepared samples to obtain a group of samples’ spectra and their corresponding rubber content data, which can be used to establish a model, which can be divided into calibration set samples and verification set samples; the original spectra are as follows: image 3 shown; the established model diagram is shown in Figure 4 shown;

[0059] R2 = 0.9055

[0060] Y=1017.35x+92.64

[0061] 3. Test samples with unknown rubber content, according to the spectral peak, use Figure 4 , to get the rubber content. Specific content in Figure 4The modeling has been given, and there is an evaluation to verify whether it is correct. It i...

Embodiment 2

[0064] Preparation of solid samples:

[0065] 1. Dried Russian rubber grass to remove moisture to obtain a dry rubber sample, then freeze and grind it, and press it into tablets.

[0066] Obtain a sheet sample; sample diameter 13mm, thickness 1mm;

[0067] 2. Then all the solid samples were subjected to Soxhlet extraction, method: 4h acetone to remove impurities, and then 4h n-hexane extraction, the final solution was evaporated to dryness by rotary evaporation to obtain rubber quality.

[0068] 3. Then take 24 samples of 2 / 3 for modeling to obtain a solid near-infrared rubber model, and then use the remaining 1 / 3 to calibrate the model. The corrected sample prediction values ​​taken are respectively to obtain the coefficient of determination R 2 is 0.8573; the prediction standard deviation SEP is 2.39; the ratio RPD of the verification set standard deviation to the prediction standard deviation is 2.67.

[0069] See Table 1 for the data

[0070] Table 1

[0071]

[00...

Embodiment 3

[0075] The LED near-infrared spectrometer adopted in embodiment 1 and embodiment 2.

[0076] The light source of near-infrared spectrum is the light source of LED array; the spectral range is 900nm-2200nm.

[0077] The near-infrared spectrometer includes: an LED array light source, a curved mirror and a detector;

[0078] The LED array light source includes 8 different single-wavelength LEDs arranged in a circle, which are evenly arranged in the arc mirror through the slot; the arc mirror is a single-sided reflective mirror; the arc mirror and the detector are respectively Soldered on the circuit board. The single wavelengths of the 8 LEDs are: 1000, 1300, 1400, 1600, 1700, 1900, 2100nm.

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Abstract

The invention discloses a method for measuring the natural rubber content in a plant and an LED near-infrared spectrometer for measurement. The method comprises the steps that (1) samples are prepared; (2) the prepared samples are measured to acquire a spectrum of a set of samples and establish a corresponding rubber content data model; and (3) the samples to be tested are measured, and accordingto the spectral peak, the model in the step 2 is used to acquire the rubber content. The near-infrared spectrometer comprises an LED array light source, a curved mirror and a detector. The LED array light source comprises 8 different single-wavelength LEDs arranged in a circle, and the LEDs are uniformly arranged in the curved mirror through a clamp slot. The curved mirror is a single-sided reflective mirror. The curved mirror and the detector are soldered on a circuit board respectively. The measuring method provided by the invention has the advantages of being convenient and quick and smallerror.

Description

technical field [0001] The invention relates to the technical field of rubber detection, and more specifically, relates to a method for measuring the content of natural rubber in plants and an LED near-infrared spectrometer for the measurement. Background technique [0002] Near-infrared spectroscopy was developed in the 1950s and 1960s. In the 1990s, due to the development of chemometrics, the combination of near-infrared spectroscopy and chemometrics made near-infrared spectroscopy a step closer. develop. Now that the technology has matured to a certain extent, the method of near-infrared spectroscopy combined with chemometrics has been very effective in the fields of food and medicine, but it has almost no application in natural rubber. [0003] In the past, the determination of rubber content in natural rubber required a series of methods such as differential gravimetric method, infrared method, gel permeation chromatography and so on. However, the time required by the...

Claims

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Application Information

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IPC IPC(8): G01N21/359
Inventor 董益阳马翔张继川张立群刘佳蕙陈莹
Owner BEIJING UNIV OF CHEM TECH
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