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A hydrophobic ionic liquid [mbpy]tf 2 Fluorescence detection method of n

An ionic liquid and fluorescence detection technology, applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of long equilibration time of chromatographic column, long time of baseline flushing, high price, etc., to improve detection sensitivity, simple and fast steps, The effect of increasing fluorescence intensity

Active Publication Date: 2017-06-27
JIAXING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some ionic liquids such as those whose cation is pyrrolidine ([MBPy]Tf 2 N) there is no characteristic absorption peak in the ultraviolet wavelength range, then the conventional ultraviolet spectrometry and the liquid chromatograph whose detector is an ultraviolet detector cannot be directly used for the detection of ionic liquid; and ion chromatography is based on the principle of cation exchange , requires a special cation exchange column, and the chromatographic column equilibrates for a long time; ion pair chromatography requires a special ion pair reagent, which is expensive; and the baseline flushing time is long, which is time-consuming

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  • A hydrophobic ionic liquid [mbpy]tf <sub>2</sub> Fluorescence detection method of n
  • A hydrophobic ionic liquid [mbpy]tf <sub>2</sub> Fluorescence detection method of n
  • A hydrophobic ionic liquid [mbpy]tf <sub>2</sub> Fluorescence detection method of n

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Experimental program
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Effect test

Embodiment 1

[0085] A kind of hydrophobic ionic liquid [MBPy] Tf of the present embodiment 2 The fluorescence detection method of N comprises the following steps:

[0086] (1)[MBPy]Tf 2 Preparation of N ethanol standard stock solution a: Weigh 500.2mg ionic liquid [MBPy]Tf2 N was dissolved in ethanol, transferred to a 100mL volumetric flask, made up to 5002.00μg·mL with ethanol and shaken evenly. -1 [MBPy]Tf 2 The standard stock solution of N was placed in a 4°C refrigerator for later use.

[0087] (2)[MBPy]Tf 2 Preparation of N ethanol standard solution: Accurately pipette standard stock solutions a0.25mL, 0.50mL, 0.75mL, 1.00mL, 1.25mL into 25mL volumetric flasks, and dilute with ethanol to make 50.02μg·mL -1 , 100.04μg·mL -1 , 150.06μg·mL -1 , 200.08μg·mL -1 , 250.10μg·mL -1 [MBPy]Tf 2 N ethanol standard solution;

[0088] (3) Take the concentration as 200.08μg·mL -1 [MBPy]Tf 2 N ethanol standard solution, using a molecular fluorescence photometer for fluorescence scanning, ...

Embodiment 2

[0093] A kind of hydrophobic ionic liquid [MBPy] Tf of the present embodiment 2 The fluorescence detection method of N comprises the following steps:

[0094] (1)[MBPy]Tf 2 The preparation of N ethanol standard stock solution a: with embodiment 1;

[0095] (2)[MBPy]Tf 2 Preparation of N ethanol-water standard solution: Accurately pipette the standard stock solution a 0.25mL, 0.50mL, 0.75mL, 1.00mL, 1.25mL to a 25mL volumetric flask and dilute to 50.02μg·mL with deionized water -1 , 100.04μg·mL -1 , 150.06μg·mL -1 , 200.08μg·mL -1 , 250.10μg·mL -1 [MBPy]Tf 2 N ethanol-water standard solution;

[0096] (3) Take the concentration as 200.08μg·mL -1 [MBPy]Tf 2 N ethanol-water standard solution, using a molecular fluorescence photometer for fluorescence scanning, the scanning results are shown in Figure 4A ;

[0097] Scanning parameters of molecular fluorescence photometer: excitation voltage 600V, excitation slit 10nm, emission slit 10nm, scanning speed 600nm / min, aver...

Embodiment 3

[0101] A kind of hydrophobic ionic liquid [MBPy] Tf of the present embodiment 2 The fluorescence detection method of N comprises the following steps:

[0102] (1)[MBPy]Tf 2 Preparation of N dichloromethane standard stock solution b: Accurately weigh [MBPy]Tf 2 N standard solution 500.4mg, add dichloromethane to dissolve, transfer to a 100mL volumetric flask, dilute to volume with dichloromethane, shake well, and prepare 5004.00μg·mL -1 [MBPy]Tf 2 The N stock solution was stored in a 4°C refrigerator for later use.

[0103] (2)[MBPy]Tf 2 Preparation of N dichloromethane standard solution: Accurately pipette standard stock solution b 0.25mL, 0.50mL, 0.75mL, 1.00mL, 1.25mL to a 25mL volumetric flask and prepare 50.04μg·mL with dichloromethane -1 , 100.08μg·mL -1 , 150.12μg·mL -1 , 200.16μg·mL -1 , 250.20μg·mL -1 [MBPy]Tf 2 N dichloromethane standard solution.

[0104] (3) Take the concentration as 200.16μg·mL -1 [MBPy]Tf 2 N dichloromethane standard solution, utilize...

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Abstract

The invention discloses a hydrophobic ionic liquid [MBPy]Tf 2 The fluorescence detection method of N, this method comprises: (1) with [MBPy]Tf 2 N is dissolved in the solvent to prepare a set of standard solutions; (2) Take one of the standard solutions for fluorescence scanning to obtain [MBPy]Tf 2 The maximum excitation wavelength and emission wavelength of N in the solvent; (3) under the maximum excitation wavelength, carry out fluorescence scanning to the standard solution to obtain the standard curve of ionic liquid concentration and fluorescence intensity; (4) pretreat the sample to be tested, Obtain the concentrated solution of the sample, and use the above-mentioned solvent to dissolve the concentrated solution to obtain the solution to be tested; (5) perform fluorescence scanning on the solution to be tested under the same conditions as step (3), to obtain the fluorescence intensity of the solution to be tested; (6) according to the standard The curve calculates the concentration of the ionic liquid in the liquid to be tested. The present invention is aimed at [MBPy]Tf 2 N established a fluorescent detection method, the detection steps are simple and fast, and the results are accurate and sensitive.

Description

technical field [0001] The invention relates to a detection method of an ionic liquid, in particular to a hydrophobic ionic liquid [MBPy]Tf 2 Fluorescence detection method of N. Background technique [0002] Ionic liquids (ionic liquids) are generally room temperature molten salts composed of anions and cations. Because of their simple preparation, low vapor pressure, good electrical conductivity, special solubility, easy separation, and easy recovery, they are considered to be new green solvents. The unique physical and chemical properties have attracted widespread attention in many fields such as organic synthesis, extraction, electrochemistry, chemical catalysis, biocatalysis, and pharmaceuticals. Especially, the characteristics of ionic liquids in enzyme catalysis and whole-cell catalysis have aroused the interest of researchers. With the deepening of research on ionic liquids, the need to establish a detection method for the content of ionic liquids and to evaluate the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 曹红欧阳巧凤郑兰兰张馨刘进蔡静晓
Owner JIAXING UNIV