CN114805262A - Viscosity and polarity response type platform fluorescent probe, hydrogen sulfide detection fluorescent probe, synthesis process and application thereof - Google Patents
Viscosity and polarity response type platform fluorescent probe, hydrogen sulfide detection fluorescent probe, synthesis process and application thereof Download PDFInfo
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- CN114805262A CN114805262A CN202210483797.XA CN202210483797A CN114805262A CN 114805262 A CN114805262 A CN 114805262A CN 202210483797 A CN202210483797 A CN 202210483797A CN 114805262 A CN114805262 A CN 114805262A
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- C07D307/78—Benzo [b] furans; Hydrogenated benzo [b] furans
- C07D307/82—Benzo [b] furans; Hydrogenated benzo [b] furans with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
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Abstract
The invention discloses a viscosity and polarity response type platform fluorescent probe, a hydrogen sulfide detection fluorescent probe, a synthesis process and application thereof. The structure of the hydrogen sulfide detection fluorescent probe is shown as follows;. Aiming at the problems of poor operability, low sensitivity and the like in polarity and viscosity detection in a physiological microenvironment, the invention provides a high-sensitivity platform fluorescent probe for detecting environmental viscosity and polarity, which can react the change of environmental viscosity through the drastic change of fluorescence intensity and the change of environmental polarity through the change of a fluorescence emission position; at the same time, the probe molecule can be used as a good probeThe platform molecule is used for synthesizing probes in different application fields; the hydroxyl of the fluorescent probe molecule is modified to obtain the high-sensitivity hydrogen sulfide detection fluorescent probe, the detection sensitivity of the high-sensitivity hydrogen sulfide detection fluorescent probe can reach 36 nanomole, and the high-sensitivity hydrogen sulfide detection fluorescent probe can be used for monitoring hydrogen sulfide in cells.
Description
Technical Field
The invention relates to the technical field of in vivo hydrogen sulfide detection, in particular to a viscosity and polarity response type platform fluorescent probe, a hydrogen sulfide detection fluorescent probe, a synthesis process and application thereof.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Viscosity and polarity are two important indexes in biological microenvironment, and are closely related to a plurality of pathophysiological processes such as inflammation, neurodegenerative diseases and even cancer. On one hand, the change of viscosity in a biological system can affect the processes of signal transduction, biomacromolecule interaction, apoptosis, autophagy and the like of cells; on the other hand, many physiological processes such as protein denaturation, polypeptide aggregation, membrane fusion and conformational changes of enzymes are affected by changes in the polarity of the physiological environment. However, measurement of viscosity and polarity in physiological microenvironments remains a significant challenge in chemical biology today.
Hydrogen sulfide is a toxic gas in industrial waste gas and is also an important endogenous signal gas transmitter in life systems. In vivo, cysteine and its derivatives can be metabolized by enzyme catalysis to produce hydrogen sulfide. Research shows that endogenous hydrogen sulfide is involved in the physiological process of cells and has various physiological functions of relaxing blood vessels, regulating blood pressure, regulating insulin secretion and the like. The traditional detection method of hydrogen sulfide comprises a standard iodine amount method, a lead acetate test paper method, an ion activity method, a hydrogen sulfide instrument method and the like. However, the conventional analysis method cannot perform in vivo detection, and has the disadvantages of dependence on a large-scale detection instrument, complex pretreatment of a sample to be detected, slow detection speed, inapplicability to real-time in-situ detection and the like.
Disclosure of Invention
Aiming at the problems, the invention provides a viscosity and polarity response type platform fluorescent probe, a hydrogen sulfide detection fluorescent probe, a synthesis process and application thereof. In order to achieve the purpose, the technical scheme of the invention is as follows:
in a first aspect of the invention, the invention discloses a viscosity and polarity response type platform fluorescent probe, which has a structure shown in formula 3.
In the above formula 3, the substituent R 1 Is a hydrocarbon group such as methyl, ethyl, etc.; substituent R 2 is-CN, -CONH 2 and-COOH, etc.
In a second aspect of the invention, the invention discloses a hydrogen sulfide detection fluorescent probe, which has a structure shown in formula 4.
In the above formula 4, the substituent R 1 Is a hydrocarbon group such as methyl, ethyl, etc.; substituent R 2 is-CN, -CONH 2 and-COOH, etc.
In a third aspect of the invention, the invention discloses a synthesis process of the viscosity and polarity response type platform fluorescent probe, which comprises the following steps: taking a compound shown in a formula 1 and 4-diethylamino salicylaldehyde as raw materials, heating to react, and separating out a target product shown in a formula 3 to obtain the compound.
In the formula 1, the substituent R 1 Is a hydrocarbon radical, e.g. methyl (-CH) 3 ) Ethyl (-CH) 2 CH 3 ) Etc.; substituent R 2 is-CN, -CONH 2 and-COOH, etc.
Further, the molar ratio of the compound shown in the formula 1 to the 4-diethylamino salicylaldehyde is in a range of 1: 1-4: 1.
further, the compound represented by formula 1 and 4-diethylamino salicylaldehyde are dissolved in a solvent and then heated for reaction. Optionally, the solvent comprises: methanol, ethanol, N-Dimethylformamide (DMF), dimethyl sulfoxide (DMSO), etc.
Further, the temperature of the heating reaction is 50-100 ℃.
In a fourth aspect of the invention, the invention discloses a synthesis process of the hydrogen sulfide detection fluorescent probe, which comprises the following steps: taking a viscosity and polarity response type platform fluorescent probe shown in a formula 3 and 2, 4-dinitrofluorobenzene as raw materials, reacting under the catalysis of alkali, and separating out a target product shown in a formula 4 to obtain the fluorescent probe.
Further, the molar ratio of the viscosity and polarity response type platform fluorescent probe shown in formula 3 to 2, 4-dinitrofluorobenzene is in the range of 1: 1-1: 1.5.
further, the viscosity and polarity response type platform fluorescent probe shown in formula 3 and 2, 4-dinitrofluorobenzene are dissolved in a solvent and then react. Optionally, the solvent comprises: dichloromethane, chloroform, acetonitrile, and the like.
Further, the alkali is added in a proportion of one time or more than the molar amount of the raw material represented by formula 3. Preferably, the base includes any one of triethylamine, potassium carbonate, and the like.
In the fifth aspect of the invention, the application of the viscosity and polarity response type platform fluorescent probe (formula 3) and the hydrogen sulfide detection fluorescent probe (formula 4) in the fields of biology, medicine and the like is disclosed, and the application is preferably used for monitoring hydrogen sulfide in vivo.
Compared with the prior art, the invention has the following beneficial effects:
aiming at the problems of poor operability, low sensitivity and the like in polarity and viscosity detection in a physiological microenvironment, the invention provides a high-sensitivity platform fluorescent probe (formula 3) for detecting environmental viscosity and polarity, which can react the change of environmental viscosity through the drastic change of fluorescence intensity and the change of environmental polarity through the change of a fluorescence emission position; meanwhile, the probe molecule can be used as an excellent platform molecule for synthesizing probes in different application fields; the hydroxyl of the fluorescent probe molecule is reformed to obtain the high-sensitivity hydrogen sulfide detection fluorescent probe (formula 4), the 2, 4-dinitrofluorobenzene unit containing strong electron-withdrawing nitro is adopted to quench molecular fluorescence, and the hydrogen sulfide molecule and the unit can generate aromatic nucleophilic substitution reaction to cause the 2, 4-dinitrofluorobenzene unit to be separated from the hydrogen sulfide fluorescent probe (formula 4), so that a molecular fluorescent signal is recovered, and the detection of hydrogen sulfide is realized. Through tests, the detection sensitivity of the hydrogen sulfide detection fluorescent probe is up to 36 nanomole, and the hydrogen sulfide detection fluorescent probe can be used for monitoring hydrogen sulfide in a special environment of cells.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a nuclear magnetic resonance hydrogen spectrum of a viscosity and polarity responsive plateau fluorescent probe molecule synthesized according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of the NMR spectrum of the first embodiment of the synthesized viscosity and polarity responsive plateau fluorescent probe molecule in the region of 6.0-8.8 chemical shifts.
FIG. 3 is the NMR spectrum of a fluorescent probe for hydrogen sulfide detection synthesized in the third embodiment of the present invention.
FIG. 4 is a graph of fluorescence emission of the viscosity and polarity response type platform fluorescent probe molecules synthesized according to the first embodiment of the present invention in a system with different viscosities of glycerol-water composition.
FIG. 5 is a graph showing the relationship between fluorescence intensity and viscosity in different viscosity systems of glycerol-water compositions for the viscosity and polarity response type platform fluorescent probe molecules synthesized according to the first embodiment of the present invention.
FIG. 6 is a graph showing fluorescence emission of the viscosity and polarity responsive plateau fluorescent probe molecule synthesized according to the first embodiment of the present invention in different polar solvents.
FIG. 7 is a graph showing the quantitative relationship between the fluorescence emission wavelength of the viscosity and polarity response type platform fluorescent probe molecule synthesized in the first embodiment of the present invention in different polarity solvents.
FIG. 8 is a fluorescence spectrum of the hydrogen sulfide detecting fluorescent probe synthesized according to the second embodiment of the present invention after reacting with 28 analytes, respectively.
FIG. 9 is a graph showing the fluorescence intensity at 530nm after the hydrogen sulfide detecting fluorescent probe synthesized according to the second embodiment of the present invention reacts with 28 analytes, respectively.
FIG. 10 is a graph showing fluorescence intensities at 530nm after reaction with sodium sulfide in the presence of various interferents, in the hydrogen sulfide detecting fluorescent probe synthesized according to the second embodiment of the present invention.
FIG. 11 is a graph showing fluorescence intensities at different time points of the reaction between the hydrogen sulfide-detecting fluorescent probe synthesized in the second embodiment of the present invention and sodium sulfide.
FIG. 12 is a graph showing the fluorescence intensity of the hydrogen sulfide detecting fluorescent probe synthesized in the second example of the present invention after reacting with hydrogen sulfide at different concentrations for the same time.
FIG. 13 is a linear relationship graph of fluorescence intensity and hydrogen sulfide concentration after the hydrogen sulfide detecting fluorescent probe synthesized in the second embodiment of the present invention reacts with hydrogen sulfide for the same time.
FIG. 14 is a graph showing the results of the cell viability of Hela cells treated with different concentrations of the hydrogen sulfide detecting fluorescent probe synthesized in the second example.
FIG. 15 is a graph showing the results of the fluorescence confocal imaging application of the fluorescent probe for detecting hydrogen sulfide synthesized in the second embodiment of the present invention to hydrogen sulfide in cells.
Detailed Description
In the following description, further specific details of the invention are set forth in order to provide a thorough understanding of the invention. The terminology used in the description of the invention herein is for the purpose of describing particular advantages and features of the invention only and is not intended to be limiting of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Unless otherwise indicated, the drugs or agents used in the present invention are used according to the instructions of the product or by the conventional methods in the art. The process of the present invention will now be further described with reference to the drawings and the detailed description.
First embodiment
A method for preparing a viscosity and polarity response type platform fluorescent probe, referring to reaction scheme 1, comprises the following steps:
(1) 4mmol of 4-diethylamino salicylaldehyde (formula 2), 1mmol of the compound represented by formula 1 and 20mL of methanol were weighed in a three-necked flask, and the system was heated at 50 ℃ for reaction.
(2) Monitoring the reaction by TLC, cooling the reaction liquid to room temperature when the reaction intermediate disappears, removing part of solvent by rotary evaporation, and separating out a large amount of crystals after the reaction liquid is cooled; and (3) carrying out suction filtration on the solid-liquid mixture to obtain an orange solid, namely the viscosity and polarity response type platform fluorescent probe, as shown in the formula 3.
The nmr hydrogen spectra of the viscosity and polarity responsive plateau fluorescent probe of formula 3 synthesized in this example are shown in fig. 1 and 2. Wherein, FIG. 1 is the nuclear magnetic resonance hydrogen spectrum of the fluorescent probe molecule, and FIG. 2 is the enlarged view of the nuclear magnetic resonance hydrogen spectrum of the fluorescent probe molecule in the region with the chemical shift of 6.0-8.8. The structural formula 3 of the viscosity and polarity response type platform fluorescent probe can be determined from fig. 1 and 2.
The structural characterization data of the viscosity and polarity responsive platform fluorescent probe synthesized in this example are as follows: 1 HNMR(500MHz,DMSO-d 6 ),δ(ppm):12.39(s,1H),8.75(d,J= 1.55Hz,1H),8.01(dd,J 1 =8.60Hz,J 2 =1.70Hz,1H),7.41(d,J=8.55Hz, 1H),7.20(d,J=9.00Hz,1H),6.33(dd,J 1 =8.95Hz,J 2 =1.90Hz 1H),6.13(d, J=2.00Hz,1H),4.40(q,J=7.15Hz,2H),3.42(q,J=7.15Hz,4H),1.43(t,J =7.15Hz,3H),1.23(t,J=7.15Hz,6H);ESI-MS:m/z[M+H] + calcd for: C 23 H 24 N 3 O 4 :406.1;found 406.1.ESI-MS:m/z[M+H] + calcd for: C 29 H 26 N 5 O 8 :572.1;found 572.2.
second embodiment
A method for preparing a viscosity and polarity response type platform fluorescent probe, which is referred to the reaction scheme 1, comprises the following steps:
(1) 1mmol of 4-diethylamino salicylaldehyde (formula 2), 1mmol of the compound represented by formula 1 and 5mL of DMF were weighed into a three-necked flask, and the system was heated at 100 ℃ for reaction.
(2) Monitoring the reaction by TLC, and cooling the reaction liquid to room temperature when the reaction intermediate disappears; slowly adding the reaction solution into 50mL of saturated saline solution, and precipitating a large amount of solid; and (3) carrying out suction filtration on the solid-liquid mixture to obtain an orange solid, namely the viscosity and polarity response type platform fluorescent probe, as shown in the formula 3.
The structural characterization data of the viscosity and polarity responsive platform fluorescent probe synthesized in this example are as follows: 1 HNMR(500MHz,DMSO-d 6 ),δ(ppm):12.39(s,1H),8.75(d,J= 1.55Hz,1H),8.01(dd,J 1 =8.60Hz,J 2 =1.70Hz,1H),7.41(d,J=8.55Hz, 1H),7.20(d,J=9.00Hz,1H),6.33(dd,J 1 =8.95Hz,J 2 =1.90Hz,1H),6.13 (d,J=2.00Hz,1H),4.40(q,J=7.15Hz,2H),3.42(q,J=7.15Hz,4H),1.43(t, J=7.15Hz,3H),1.23(t,J=7.15Hz,6H);ESI-MS:m/z[M+H] + calcd for: C 23 H 24 N 3 O 4 :406.1;found 406.1.
third embodiment
A preparation method of a hydrogen sulfide detection fluorescent probe refers to reaction scheme 2 and comprises the following steps:
(1) weighing 0.5mmol of the viscosity and polarity response type platform fluorescent probe synthesized in the first embodiment and shown in formula 3, 0.6mmol of 2, 4-dinitrofluorobenzene, 0.55mmol of triethylamine and 10mL of dichloromethane in a three-neck flask; the mixture was heated at 35 ℃ for reaction.
(2) And monitoring the reaction completion by TLC, cooling the reaction solution to room temperature, extracting and washing the reaction solution with deionized water for three times, drying an organic layer with anhydrous sodium sulfate, and removing the solvent by rotary evaporation to obtain a crude product. And recrystallizing the crude product by using a mixed solution of ethanol and dichloromethane (ethanol: dichloromethane ═ 1: 1), and performing suction filtration to obtain a red solid, namely the hydrogen sulfide detection fluorescent probe, as shown in a formula 4.
The nmr hydrogen spectrum of the hydrogen sulfide detecting fluorescent probe of formula 4 synthesized in this example is shown in fig. 3, and it can be determined from fig. 3 that the nmr hydrogen spectrum of the hydrogen sulfide detecting fluorescent probe is shown in formula 4.
The structural characterization data of the viscosity and polarity responsive platform fluorescent probe synthesized in this example are as follows: 1 HNMR(500MHz,DMSO-d 6 ),δ(ppm):8.94(s,1H),8.92(d,J= 2.75Hz,1H),8.35(dd,J 1 =9.20Hz,J 2 =2.75Hz,1H),8.28(d,J=1.75Hz, 1H),8.25(d,J=9.15Hz,1H),8.03(dd,J 1 =8.70Hz,J 2 =1.80Hz,1H),7.43 (d,J=8.60Hz,1H),7.10(d,J=9.30Hz,1H),6.73(dd,J 1 =9.15Hz,J 2 =2.50 Hz,1H),6.25(d,J=2.50Hz,1H),4.43(q,J=7.10Hz,2H),3.49(q,J=7.05 Hz,4H),1.44(t,J=7.15Hz,3H),1.27(t,J=6.95Hz,6H);ESI-MS:m/z [M+H] + calcd for:C 29 H 26 N 5 O 8 :572.1;found 572.2.
fourth embodiment
A preparation method of a hydrogen sulfide detection fluorescent probe refers to the reaction scheme 2, and comprises the following steps:
(1) weighing 0.5mmol of the viscosity and polarity response type platform fluorescent probe synthesized in the formula 3 synthesized in the first embodiment, 0.6mmol of 2, 4-dinitrofluorobenzene, 0.55mmol of triethylamine and 10mL of acetonitrile in a three-neck flask; the mixture was heated at 35 ℃ for reaction.
(2) TLC to monitor the reaction is complete, stop the reaction, remove the solvent by rotary evaporation, dissolve the product with 10mL dichloromethane, wash with saturated brine three times, dry the organic layer with anhydrous sodium sulfate, and remove the solvent by rotary evaporation to obtain the crude product. And recrystallizing the crude product by using a mixed solution of ethanol and dichloromethane (ethanol: dichloromethane ═ 1: 1), and performing suction filtration to obtain a red solid, namely the hydrogen sulfide detection fluorescent probe, as shown in a formula 4.
The structural characterization data of the viscosity and polarity response type platform fluorescent probe synthesized in this example are as follows: 1 HNMR(500MHz,DMSO-d 6 ),δ(ppm):8.94(s,1H),8.92(d,J= 2.75Hz,1H),8.35(dd,J 1 =9.20Hz,J 2 =2.75Hz,1H),8.28(d,J=1.75Hz, 1H),8.25(d,J=9.15Hz,1H),8.03(dd,J 1 =8.70Hz,J 2 =1.80Hz,1H),7.43 (d,J=8.60Hz,1H),7.10(d,J=9.30Hz,1H),6.73(dd,J 1 =9.15Hz,J 2 =2.50 Hz,1H),6.25(d,J=2.50Hz,1H),4.43(q,J=7.10Hz,2H),3.49(q,J=7.05 Hz,4H),1.44(t,J=7.15Hz,3H),1.27(t,J=6.95Hz,6H);ESI-MS:m/z [M+H] + calcd for:C 29 H 26 N 5 O 8 :572.1;found 572.2.
fifth embodiment
A preparation method of a hydrogen sulfide detection fluorescent probe refers to reaction scheme 3 and comprises the following steps:
(1) weighing 0.5mmol of the viscosity and polarity response type platform fluorescent probe synthesized in the first embodiment and shown in formula 3, 0.5mmol of 2, 4-dinitrofluorobenzene, 0.5mmol of potassium carbonate and 10mL of dichloromethane in a three-neck flask; the mixture was heated at 35 ℃ for reaction.
(2) TLC monitors the reaction is complete, the reaction liquid is cooled to room temperature, the reaction liquid is extracted and washed by deionized water for three times, an organic layer is dried by anhydrous sodium sulfate, and the solvent is removed by rotary evaporation to obtain a crude product. And recrystallizing the crude product by using a mixed solution of ethanol and dichloromethane (ethanol: dichloromethane ═ 1: 1), and performing suction filtration to obtain a red solid, namely the hydrogen sulfide detection fluorescent probe, wherein the nuclear magnetic resonance hydrogen spectrum display structure of the red solid is shown as a formula 5.
Sixth embodiment
A preparation method of a hydrogen sulfide detection fluorescent probe refers to a reaction route 4 and comprises the following steps:
(1) weighing 0.6mmol of the viscosity and polarity response type platform fluorescent probe synthesized in the first embodiment and shown in formula 3, 0.9mmol of 2, 4-dinitrofluorobenzene, 0.9mmol of triethylamine and 10mL of chloroform in a three-neck flask; the mixture was heated at 35 ℃ for the reaction.
(2) And monitoring the reaction completion by TLC, cooling the reaction solution to room temperature, extracting and washing the reaction solution with deionized water for three times, drying an organic layer with anhydrous sodium sulfate, and removing the solvent by rotary evaporation to obtain a crude product. And recrystallizing the crude product by using a mixed solution of ethanol and dichloromethane (ethanol: dichloromethane ═ 1: 1), and performing suction filtration to obtain a red solid, namely the hydrogen sulfide detection fluorescent probe, wherein the nuclear magnetic resonance hydrogen spectrum display structure of the red solid is shown as a formula 6.
Performance index testing
1. Weighing the viscosity and polarity response type platform fluorescent probe molecules (formula 3) synthesized in the first embodiment, dissolving the platform fluorescent probe molecules in DMSO to prepare a 1mM probe molecule solution; the 1mM probe molecule solution is prepared into 10 mu M/L probe solution in different viscosity systems consisting of glycerol and water.
(1) The change in fluorescence intensity in the probe solution was measured, and the result is shown in FIG. 4. As can be seen from this FIG. 4, the viscosity and polarity responsive platform fluorescent probe molecules exhibit unique sensitivity to different viscosities of solution systems, with the fluorescence intensity increasing with increasing viscosity of the system.
(2) Testing the saidThe fluorescence intensity of the probe solution was linearly fitted to the viscosity of the system, and the results are shown in FIG. 5. As can be seen from FIG. 5, the fluorescence intensity of the viscosity and polar response type platform fluorescent probe molecule at 530nm has a good linear relationship with the viscosity of the system (R) 2 0.99), can be used as an excellent viscosity change fluorescent probe.
2. Weighing the viscosity and polarity response type platform fluorescent probe molecules (formula 3) synthesized in the first embodiment, dissolving the molecules in DMSO to prepare a 1mM probe molecule solution; taking the above 1mM probe molecule solution in different polar solvents (including ethyl acetate (EtOAc), methanol (MeOH), ethanol (EtOH), Isopropanol (IPA), dimethyl sulfoxide (DMSO), and water (H) 2 O)), 10. mu.M/L of a probe solution in a solvent of different polarity was prepared. The fluorescence emission of the probe solutions of different polar solvents was separately tested, and the results are shown in fig. 6. From this figure, it can be seen that the probe molecules exhibit unique sensitivity to solvents of different polarity, with different fluorescence emission wavelengths in different solvents.
3. Weighing the viscosity and polarity response type platform fluorescent probe molecules (formula 3) synthesized in the first embodiment, dissolving the platform fluorescent probe molecules in DMSO to prepare a 1mM probe molecule solution; taking the above 1mM probe molecule solution in different polar solvents (including ethyl acetate (EtOAc), methanol (MeOH), ethanol (EtOH), Isopropanol (IPA), dimethyl sulfoxide (DMSO), and water (H) 2 O)) was prepared as a 10. mu.M/L probe solution in a solvent of different polarity.
(1) The probe solutions of different polarity solvents were tested separately for their quantitative relationship of fluorescence emission wavelength, and the results are shown in fig. 7. As can be seen from FIG. 7, the maximum emission wavelength of the viscosity and polarity response type platform fluorescent probe molecule in these solvents is in quantitative relation to the dielectric constant (R) 2 0.99), indicating that the probe molecule can be used for quantitative analysis of environmental polarity changes.
4. The hydrogen sulfide detection fluorescent probe (formula 4) synthesized in the third example was weighed and dissolved in DMSO to prepare a 1mM probe molecule solution. Taking the probe molecule solution in Tirs-HCl buffer solution (DMSO/H) 2 O1/1, v/v, pH 7.4), prepared as 10 μ M/L probeAnd (4) a buffer solution.
To three identical aliquots of the probe buffer were added analytes: cation and anion (Al) 3+ 、 Ca 2+ 、Cd 2+ 、Co 2+ 、Cr 3+ 、Cu 2+ 、K + 、Ni 2+ 、Tb 3+ 、Zn 2+ 、Mg 2+ 、S 2 O 3 2- 、SO 3 2- 、 SO 4 2- 、HS - 、HSO 3 - 、HSO 4 - 、NO 3 - 、S 2 - Sodium salt of anion), amino acids (glycine, glutamic acid, arginine, lysine, tyrosine, aspartic acid, histidine), biological thiols (cysteine, glutamic acid), to give three analyte solutions each at a concentration of 200 μ M/L.
The fluorescence spectra and fluorescence intensities of the above three analyte solutions were measured, and the results are shown in fig. 8 and 9. As can be seen from fig. 8 and 9, the fluorescence intensity of the analyte solution in the hydrogen sulfide atmosphere changes significantly, and the fluorescence emission peak is about 530nm, but no significant fluorescence change is observed in the other analyte atmospheres. The above experiment confirms that the hydrogen sulfide detection fluorescent probe (formula 4) can be used for specific recognition of hydrogen sulfide molecules.
5. The hydrogen sulfide detection fluorescent probe (formula 4) synthesized in the third example was weighed and dissolved in DMSO to prepare a 1mM probe molecule solution. Taking the probe molecule solution in Tirs-HCl buffer solution (DMSO/H) 2 O-1/1, v/v, pH 7.4), prepared as 10 μ M/L probe buffer.
To three identical aliquots of the probe buffer were added analytes: cation and anion (Al) 3+ 、 Ca 2+ 、Cd 2+ 、Co 2+ 、Cr 3+ 、Cu 2+ 、K + 、Ni 2+ 、Tb 3+ 、Zn 2+ 、Mg 2+ 、S 2 O 3 2- 、SO 3 2- 、 SO 4 2- 、HS - 、HSO 3 - 、HSO 4 - 、NO 3 - 、S 2 - Sodium salt of anion), amino acids (glycine, glutamic acid, arginine, lysine, tyrosine, aspartic acid, histidine), biological thiols (cysteine, glutamic acid), to give three analyte solutions each at a concentration of 200 μ M/L.
To each of the three analyte solutions was added 200. mu.M/L sodium sulfide. The three analyte solutions (containing sodium sulfide) obtained were tested for fluorescence intensity at 530nm before and after the reaction, and the results are shown in FIG. 10. As can be seen from the figure, the hydrogen sulfide detection fluorescent probe (formula 4) does not show significant fluorescence change in the atmosphere of other interferents, and the fluorescence intensity is obviously changed after hydrogen sulfide is added into the interferents, which indicates that the probe molecule can be used for specific recognition of hydrogen sulfide molecules.
6. The hydrogen sulfide detection fluorescent probe (formula 4) synthesized in the third example was weighed and dissolved in DMSO to prepare a 1mM probe molecule solution. Taking the probe molecule solution in Tirs-HCl buffer solution (DMSO/H) 2 O-1/1, v/v, pH 7.4), prepared as 10 μ M/L probe buffer.
To the probe buffer, 200. mu.M/L sodium sulfide was added and the fluorescence intensity was measured at different time points of the reaction, and the results are shown in FIG. 11. From the figure, the emission at 530nm almost reaches saturation within 10min, and the fluorescence is enhanced by 95 times, which shows that the probe molecule has a rapid response to hydrogen sulfide.
7. The hydrogen sulfide detection fluorescent probe (formula 4) synthesized in the third example was weighed and dissolved in DMSO to prepare a 1mM probe molecule solution. Taking the probe molecule solution in Tirs-HCl buffer solution (DMSO/H) 2 O-1/1, v/v, pH 7.4), prepared as 10 μ M/L probe buffer.
Sodium sulfide was added to the probe buffer at different concentrations and the fluorescence intensity was measured, and the change in fluorescence intensity of the probe solution with the concentration of hydrogen sulfide was recorded, with the results shown in fig. 12. As can be seen from this figure, the fluorescence intensity of the probe solution gradually increased with the increase in the concentration of hydrogen sulfide in the range of 2 to 200 μm. The fluorescence intensity of the probe solution was linearly fitted to the hydrogen sulfide concentration, and the results are shown in FIG. 13. As can be seen from the graph, in the concentration range of 0-20 μm, there is a linear relationship between the fluorescence intensity of the probe solution and the concentration of hydrogen sulfide, and the probe solution can be used for quantitative detection of hydrogen sulfide.
8. The hydrogen sulfide detection fluorescent probe (formula 4) synthesized in the third example is weighed and dissolved in DMSO to prepare a probe molecule mother solution.
Adopting a DMEM culture medium to culture Hela cells; the probe molecule mother liquor is used as mother liquor, and the MTT method is used for testing the survival rate of Hela cells after the probe molecule mother liquor with different concentrations is treated, and the result is shown in FIG. 14. As can be seen from the figure, the hydrogen sulfide detection fluorescent probe (formula 4) is almost non-toxic to cells at a concentration of 0-100 μ M, and has a high cell survival rate.
9. HeLa cells were cultured in DMEM medium for 12 hours using the hydrogen sulfide-detecting fluorescent probe (formula 4) synthesized in the third example, and then the cells were incubated in DMEM medium containing 200. mu.M sodium sulfide for 12 hours, and fluorescence imaging was performed on the cells on a fluorescence confocal microscope, the results of which are shown in FIG. 15. The figure shows that the fluorescent probe has higher signal-to-noise ratio to the hydrogen sulfide in the cells, and can be used as a high-contrast imaging probe to detect the exogenous hydrogen sulfide in the living cells.
The above description is only illustrative of several embodiments of the present invention and should not be taken as limiting the scope of the invention. It should be noted that other persons skilled in the art can make modifications, substitutions, improvements and the like without departing from the spirit and scope of the present invention, and all of them belong to the protection scope of the present invention. Therefore, the scope of the invention should be determined from the description and claims.
Claims (10)
2. The process for synthesizing a viscosity and polarity response type platform fluorescent probe according to claim 1, comprising the steps of: taking a compound shown in a formula 1 and 4-diethylamino salicylaldehyde as raw materials, heating to react, and separating out a target product shown in a formula 3 to obtain the compound;
in the formula 1, a substituent R 1 Is a hydrocarbyl group, preferably methyl or ethyl; substituent R 2 is-CN, -CONH 2 and-COOH.
3. The process for synthesizing the viscosity and polarity response type platform fluorescent probe according to claim 2, wherein the molar ratio of the compound represented by formula 1 to 4-diethylamino salicylaldehyde is in the range of 1: 1-4: 1.
4. the process for synthesizing the viscosity and polarity response type platform fluorescent probe according to claim 2 or 3, wherein the compound represented by formula 1 and 4-diethylamino salicylaldehyde are dissolved in a solvent and then heated for reaction;
preferably, the solvent comprises: any one of methanol, ethanol, N-dimethylformamide and dimethyl sulfoxide;
preferably, the temperature of the heating reaction is 50-100 ℃.
6. The process for synthesizing the hydrogen sulfide detection fluorescent probe according to claim 5, which comprises the steps of: taking a viscosity and polarity response type platform fluorescent probe shown in a formula 3 and 2, 4-dinitrofluorobenzene as raw materials, reacting under the catalysis of alkali, and separating out a target product shown in a formula 4 to obtain the fluorescent probe.
7. The process for synthesizing the hydrogen sulfide detection fluorescent probe according to claim 6, wherein the molar ratio of the viscosity and polarity response type platform fluorescent probe shown in formula 3 to 2, 4-dinitrofluorobenzene is in the range of 1: 1-1: 1.5.
8. the synthesis process of the hydrogen sulfide detection fluorescent probe according to claim 6, wherein the viscosity and polarity response type platform fluorescent probe shown in formula 3 and 2, 4-dinitrofluorobenzene are dissolved in a solvent and then react; preferably, the solvent comprises: any one of dichloromethane, chloroform and acetonitrile.
9. The process for synthesizing a hydrogen sulfide detection fluorescent probe according to claim 6, wherein the addition ratio of the base is one time or more of the molar weight of the raw material represented by formula 3; preferably, the base comprises any one of triethylamine and potassium carbonate.
10. Use of the viscosity and polarity responsive platform fluorescent probe of claim 1 or the hydrogen sulfide detecting fluorescent probe of claim 5 in the biological and medical field, preferably for in vivo monitoring of hydrogen sulfide.
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