A nano-cellulose-based fluorescent material responsive to iron ions and its preparation method and application

A technology of nanocellulose and fluorescent materials, applied in the field of fluorescent detection nanofunctional materials, can solve the problems of difficult processing and molding of fluorescent small molecules, uniform distribution of difficult fluorescent molecules, poor stability of fluorescent probes, etc., and achieve the specific surface area of ​​ultrafine structure. , degradability, good selectivity

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the current fluorescent organic molecules are used in the form of liquid. Liquid fluorescent probes have many problems such as poor stability, insoluble in water, and inconvenient to carry.
In addition, fluorescent molecules also have many limitations: for example, they are easy to aggregate and cause fluorescence quenching; they are difficult to reuse; small fluorescent molecules are difficult to process and shape, and cannot be used in the manufacture of devices; small fluorescent molecules dissolve into the solution to be tested to form a homogeneous system may cause contamination of the system to be tested, etc.
Generally speaking, it is a relatively simple method to directly incorporate fluorescent molecules into polymers, but it is difficult to make the fluorescent molecules uniformly distributed through simple mixing.

Method used

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  • A nano-cellulose-based fluorescent material responsive to iron ions and its preparation method and application
  • A nano-cellulose-based fluorescent material responsive to iron ions and its preparation method and application
  • A nano-cellulose-based fluorescent material responsive to iron ions and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) First, dissolve 2 mmol of Rhodamine 6G in 30 mL of absolute ethanol, add 2.2 mmol of hydrazine hydrate (80%) dropwise at room temperature and keep stirring, after adding, the resulting mixture is reacted at 65° C. under vigorous stirring for 2 h; the solvent was removed under reduced pressure, the product was washed 3 times with ethanol / aqueous solution (1:1, v / v), and dried to obtain a pink solid RG1;

[0045] (2) 1 mmol RG1 was dissolved in 10 mL of absolute ethanol, 2 mmol of glyoxal (40%) was added, and the resulting mixture was stirred at room temperature for 12 hours; the precipitate produced by filtration was washed 3 times with absolute ethanol and dried. Then get yellow solid RG2;

[0046] (3) 5 mL of 3-aminopropyl-triethoxysilane (APTES) was slowly added to 100 mL of ethanol / water (20 / 80, v / v) solution under magnetic stirring, and the pH was adjusted with glacial acetic acid. When the pH was stable at 4, 1 g of nanocellulose (specifically, cellulose nanofib...

Embodiment 2

[0056] (1) Take the nanocellulose-based fluorescent material prepared in Example 1 and configure it into a suspension of 0.002 g / mL;

[0057] (2) The configuration concentration is 10 -3 Fe of M 3+ Standard solutions and concentrations of 10 -3 M's Al 3+ , Cu 2+ , Cr 3+ and other metal cations (Other ions) (including Ni 2+ , Zn 2+ , Ca 2+ , Ba 2+ , Mg 2+ , Hg 2+ , Pb 2+ , Co 2+ , Mn 2+ , K + , Na + , Li + ) solution, ready for use;

[0058] (3) Take two milliliters of the suspension in the step (1) in different quartz cuvettes that are transparent on all sides, then add the various metal cation solutions in the step (2) respectively, and detect it with an ultraviolet spectrophotometer. Absorption spectrum at 400nm-650nm; use a fluorescence spectrometer to detect the fluorescence intensity, the slit of the fluorescence spectrometer is set to 5nm, the excitation wavelength is set to 500nm, and the fluorescence intensity of the emission peak at the wavelength of ...

Embodiment 3

[0061] (1) Take the nanocellulose-based fluorescent material prepared in Example 1 and configure it into a suspension of 0.002 g / mL;

[0062] (2) The configuration concentration is 10 -3 Fe of M 3+ Standard solution, spare;

[0063] (3) Take two milliliters of the suspension in step (1) in different quartz cuvettes that are transparent on all sides, and then add a series of Fe of different dilution ratios in step (2) respectively. 3+ Solution, use a fluorescence spectrometer to detect the fluorescence intensity, the slit of the fluorescence spectrometer is set to 5nm, the excitation wavelength is set to 500nm, and the fluorescence intensity of the emission peak at the wavelength of 556nm is detected.

[0064] The result is as Figure 7 As shown, within the range of 1 μM to 10 μM, with the increase of iron ion content, the phenomenon of fluorescence intensity enhancement at 556 nm becomes more and more obvious, and the fluorescence intensity (F-F 0 ) / F 0 Good linearity wit...

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Abstract

The invention discloses a nano-cellulose-based fluorescent material responsive to iron ions, a preparation method and application thereof, and belongs to the technical field of fluorescent detection nano-functional materials. In the present invention, rhodamine 6G is used as a fluorescent group, reacted step by step with hydrazine hydrate and glyoxal to prepare an iron ion-responsive fluorescent group RG2; then, APTES is used to aminate and modify nanocellulose to prepare aminated nanofibers element; finally, RG2 was reacted with aminated nanocellulose to obtain a nanocellulose-based fluorescent material responsive to iron ions. The nanocellulose-based fluorescent material is easy to carry and store. Under ultraviolet irradiation, adding Fe 3+ Fluorescence is generated later, and the luminescence performance is good, and it is suitable for Fe 3+ With good selectivity, the Fe 3+ The specific identification detection is simple and convenient to operate, and has potential application value in the fields of environmental monitoring and food safety.

Description

technical field [0001] The invention belongs to the technical field of nanometer functional materials for fluorescence detection, and in particular relates to an iron ion-responsive nanocellulose-based fluorescent material and a preparation method and application thereof. Background technique [0002] Iron (Fe) is an essential metal in people's lives and one of the essential trace elements in biological systems and environmental processes. Iron plays an important role in the formation of heme and the storage and transport of oxygen to tissues; it is also a constituent of most enzymes and immune system chemicals. Iron deficiency can lead to anemia and effects on the immune system; when iron is present in excess, it can lead to severe pathophysiological conditions such as Parkinson's, beta-thalassemia and Alzheimer's disease. In addition, the United States Environmental Protection Agency (UEPA) and the World Health Organization (WHO) limit the Fe content in drinking water to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/06C09K11/02C09K11/06G01N21/64
CPCC08B15/06C09K11/06C09K11/025G01N21/643C09K2211/1033
Inventor 陈克复周晓明王斌李金鹏
Owner SOUTH CHINA UNIV OF TECH
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