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Method for selectively adsorbing 4-tolyl aldehyde in tobacco shred

A methylbenzaldehyde and selective technology, applied in the field of chemical detection, can solve the problems of high detection cost, narrow application range, and few types of mobile phases, and achieve the effects of short adsorption time, easy operation, and broad application prospects

Inactive Publication Date: 2018-09-28
GUANGDONG GOLDEN LEAF TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these detection methods require large-scale instruments and equipment, and the use and daily maintenance costs of these equipment are high, so they require high detection costs.
In addition, gas phase detection is limited by the volatility and thermal stability of the sample, the application range is narrow, and there are fewer types of mobile phases; the detection time of liquid phase is longer

Method used

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  • Method for selectively adsorbing 4-tolyl aldehyde in tobacco shred
  • Method for selectively adsorbing 4-tolyl aldehyde in tobacco shred
  • Method for selectively adsorbing 4-tolyl aldehyde in tobacco shred

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Accurately weigh methacrylic acid (27.0μL), N-isopropylacrylamide (73.9mg), N,N-dimethylbisacrylamide (3.9mg) dissolved in 80mL distilled water, N-tert-butylacrylamide ( 39.2 mg) was dissolved in 1 mL of absolute ethanol, ultrasonicated for 10 min; then, adjusted to pH = 6.0 with NaOH, added 20.0 mg of template molecule (4-methylbenzaldehyde) (dissolved in distilled water), and shaken at 70 rpm (35°C) for 4 hours Then, slowly add the aqueous solution of initiator (ammonium persulfate (60.0mg), sodium bisulfite (20.0mg), sodium lauryl sulfate (40.0mg) is dissolved in the distilled water of 20mL), at 35 ℃ Polymerization reaction 24h;

[0044] After the reaction is complete, ethanol-chloroform is used as the extractant, and a Soxhlet extractor is used to reflux overnight to elute the template molecule (4-methylbenzaldehyde) to obtain a crude molecularly imprinted polymer;

[0045] The molecularly imprinted polymer crude product is dialyzed with distilled water for 3 to 4 ...

Embodiment 2

[0049] ① Preparation of molecularly imprinted polymer solution (1mg / mL)

[0050] Accurately weigh 6.0 mg of molecularly imprinted polymer solid powder MIP-3 and ultrasonically dissolve it in 6.0 mL of distilled water to prepare a 1 mg / mL molecularly imprinted polymer solution;

[0051] ②Determination of 4-methylbenzaldehyde concentration-UV absorbance standard curve (10, 5, 4, 2, 1, 0.5, 0.2, 0.1 μg / mL)

[0052] Purchase or prepare a standard solution of 100 μg / ml 4-methylbenzaldehyde by yourself: Accurately weigh 2.0 mg of 4-methylbenzaldehyde and dissolve in 20.0 ml of absolute ethanol.

[0053] Preparation of 10μg / ml 4-methylbenzaldehyde solution: 1ml 100μg / ml 4-methylbenzaldehyde + 9ml absolute ethanol; preparation of 5μg / ml 4-methylbenzaldehyde solution: 5ml 10μg / ml 4-methylbenzaldehyde Benzaldehyde + 5ml absolute ethanol; 4μg / ml 4-methylbenzaldehyde solution preparation: 2ml 10μg / ml 4-methylbenzaldehyde + 3ml absolute ethanol; 2μg / ml 4-methylbenzaldehyde solution prepar...

Embodiment 3

[0060] Take a commercially available cigarette X, cut it open, take out the shredded tobacco and dry it, and prepare the ethanol solution of the shredded tobacco according to the steps described in Example 1, and combine the ethanol solution of the shredded tobacco with the molecularly imprinted cigarette prepared in Example 2 The polymer solution (1mg / mL) was mixed, ultrasonically oscillated for 30min, and the selective adsorption was completed; further, ethanol-chloroform was used as the extractant, and the Soxhlet extractor was used to reflux overnight to elute 4-methylbenzaldehyde, and then in the established On the basis of the concentration of 4-methylbenzaldehyde-ultraviolet absorbance standard curve, the content of 4-methylbenzaldehyde in the extractant was measured by ultraviolet spectrophotometry, thereby indirectly measuring the 4-methylbenzaldehyde in the shredded tobacco of cigarette X. content of benzaldehyde.

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Abstract

The invention provides a method for selectively adsorbing 4-tolyl aldehyde in tobacco shred. The method mainly comprises the following steps: weighing methacrylic acid, N-isopropyl acrylamide and N,N-dimethyl bisacrylamide, dissolving into water under the action of ultrasonic waves, adding an absolute ethanol solution of N-tert-butyl acrylamide, and carrying out ultrasonic degassing; adjusting thepH value to 5.8-6.2, and adding 4-tolyl aldehyde as a template molecule; dropping a water solution of an initiator, and carrying out a polymerization reaction; eluting the template molecule so as toobtain a crude product of a molecularly imprinted polymer, carrying out dialysis, freeze-drying a dialysis liquid so as to obtain solid powder of the molecularly imprinted polymer, and preparing a molecularly imprinted polymer solution; mixing an ethanol solution of tobacco shred with the molecularly imprinted polymer solution, carrying out ultrasonic oscillation, and completing selective adsorption. The method for selectively adsorbing 4-tolyl aldehyde in tobacco shred, which is provided by the invention, is easy to operate, short in adsorption time, applicable to tobacco product control anddetection, and thus has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to a method for selectively adsorbing 4-methylbenzaldehyde in shredded tobacco. Background technique [0002] Cigarettes contain at least 69 kinds of carcinogens, and tobacco smoke contains more than 7,000 kinds of chemical components; substances harmful to human body produced after cigarettes are ignited are roughly divided into 5 categories: (1) Aldehydes and nitrogen compounds, these substances are irritating to the respiratory tract (2) nicotine, which can stimulate the sympathetic nerves and make smokers dependent; (3) amines, cyanides and heavy metals, which are toxic substances; (4) benzopyrene, arsenic and other radioactive substances, which (5) Carbon monoxide can reduce the ability of red blood cells to transport oxygen to the whole body. Among them, aldehydes have a stimulating effect on eyes and mucous membranes, for example, 4-methylbenzaldehyde ...

Claims

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Application Information

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IPC IPC(8): B01D11/04B01J20/292G01N21/33G01N30/02C08F220/54C08F220/06C08F220/38C08J9/28
CPCB01D11/0492B01J20/292C08F220/54C08J9/28C08J2333/24G01N21/33G01N30/02G01N2030/027C08F220/06C08F220/38
Inventor 傅源锋李正勇赵闯王磊管传莉陈泽鹏陈桢禄文志强
Owner GUANGDONG GOLDEN LEAF TECH DEV
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