Liquid-phase micro-extraction technology for electric field enhanced hollow fibrous membrane and device for same

An extraction technology and extraction device technology, applied in the field of electric field enhanced hollow fiber membrane liquid phase microextraction technology and devices, can solve the problems of long extraction time and achieve the effect of strong practical value

Inactive Publication Date: 2010-03-17
TIANJIN POLYTECHNIC UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

This new type of device called LCMS (liquid-chromatography/microfluidic system) allows faster and more efficient separation or enhanced purification of samples by separating them into different components before they are analyzed further downstream. Unlike existing techniques like gas chromatoxin assaying, which require long time periods, these devices have several technical benefits that make it useful across various industries including environment science, pharmaceutics research, healthcare industry, medical diagnoses, biological testing, and other areas where quicker results may benefit from improved accuracy compared to current technologies.

Problems solved by technology

Technologies for improving the efficiency and accuracy of liquid-liquidexmchange processes have been studied during past decades. These improvements involve developing new devices and methods that improve their performance without increasing complexity. Current technics require multiple steps involving several hours before reaching steady state, making them challenging when considering applications like environmentally engineered materials, chemical reactions, medical diagnoses, and biological samples.

Method used

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  • Liquid-phase micro-extraction technology for electric field enhanced hollow fibrous membrane and device for same
  • Liquid-phase micro-extraction technology for electric field enhanced hollow fibrous membrane and device for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Using phenol as a probe compound to test the influence of voltage on enrichment efficiency

[0031] The membrane used is a hollow fiber membrane, the membrane pore size is 0.02 μm, the membrane porosity is 40%, and the inner diameter of the hollow membrane tube is 1 mm. n-octanol was used as the extraction phase, and dilute phenol aqueous solution was used as the sample solution. Take 5ml of the sample solution in a small tube-type container, add 20 μL n-octanol into the hollow fiber membrane at the closed end, insert the positive electrode into the hollow fiber membrane from the unclosed end until it contacts with n-octanol, and connect the negative electrode to the small tube-type container. Turn on the power supply, complete the extraction under the electric field, take a sample with a micro-sampler, and measure the sample concentration of the extract phase and the raffinate phase in a gas chromatograph. figure 2 It is the influence of the applied voltag...

Embodiment 2

[0032] Embodiment 2: Measure the logP of pure organic compound with this device

[0033] Phenol, aniline, and nitrobenzene were respectively taken as probe compounds, and the n-octanol-water partition coefficients of these pure substances were determined. The operation method is the same as in Example 1, the applied voltage is 60V, and after extraction for 4 minutes, the concentration of the analyte in the n-octanol phase and the water phase are measured respectively. The calculated n-octanol phase concentration / water phase concentration is the partition coefficient, and the logarithm of the partition coefficient is log P. Use this device to measure the log P of several compounds, see the table below:

[0034] Organic matter Experimental value Literature value

[0035] Nitrobenzene 1.77 1.85

[0036] Aniline 0.93 0.90

[0037] Phenol 1.47 1.50

Embodiment 3

[0038] Example 3: Comparison of extraction effect between electric field enhanced mass transfer and traditional method

[0039] Using nitrobenzene as a probe compound to investigate the difference between electric field enhanced mass transfer and traditional stirring method extraction effect, the specific operation is the same as in Example 2, except that the first group of three groups of comparative experiments applies a DC enhanced voltage of 60V; the second group does not enhance Instead, the traditional shaking flask method was used; the third group did not apply the strengthening voltage, but instead applied magnetic stirring for strengthening. The experimental results show that the logP values ​​measured by the three methods are the same, but the equilibrium time is 3min, 25min and 20min respectively. The fast and high-efficiency characteristics of the present invention have been confirmed.

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Abstract

The invention relates to hollow fibrous membrane-based liquid-phase micro-extraction technology under an electric field enhancement condition and a device for the same. The method comprises the following steps of: applying an appropriate direct-current electric field between sample solution 5 and an extraction phase 7; and using the adjustable electric filed to enhance an orientated mass transferprocess of an object to be analyzed between two phases to accelerate the balance of components to be analyzed between the two phases; therefore, the technology is novel liquid-phase micro-extraction technology. Compared with a conventional liquid-phase micro-extraction method, the technology fully embodies the characteristics of rapidness and high efficiency on the premise of having all the advantages of the conventional hollow fibrous membrane-based liquid-phase micro-extraction technology. The technology is pre-treatment and pre-enrichment technology for various analysis measures as well asa method for measuring a liquid-phase balancing parameter, so that the technology can be widely applied in various fields such as environmental engineering, medicament research and development, food safety and the like, and has high practical value.

Description

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Claims

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Application Information

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Owner TIANJIN POLYTECHNIC UNIV
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