CN113418884A - Colorimetric array sensor based on DNA-AuNPs system and preparation method thereof - Google Patents
Colorimetric array sensor based on DNA-AuNPs system and preparation method thereof Download PDFInfo
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- CN113418884A CN113418884A CN202110687198.5A CN202110687198A CN113418884A CN 113418884 A CN113418884 A CN 113418884A CN 202110687198 A CN202110687198 A CN 202110687198A CN 113418884 A CN113418884 A CN 113418884A
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- aminoglycoside antibiotics
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- G—PHYSICS
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
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- Biochemistry (AREA)
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- General Physics & Mathematics (AREA)
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- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
The invention discloses a colorimetric array sensor based on a DNA-AuNPs system, which comprises three sensing units, wherein each sensing unit comprises an aptamer and gold nanoparticles with negative charges on the surface, and the aptamers of the three sensing units are different and are all the aptamers of aminoglycoside antibiotics; the particle diameters of the gold nanoparticles of the three sensing units are the same and are within the range of 10-20 nm. The invention also provides a preparation method of the colorimetric array sensor based on the DNA-AuNPs system. The colorimetric array sensor has high sensitivity, can realize effective discrimination under the lowest concentration of 40ng/mL for 5 aminoglycoside antibiotics, and is lower than the national detection standard.
Description
Technical Field
The invention belongs to the field of antibiotic detection, and particularly relates to a DNA-AuNPs system-based colorimetric array sensor and a preparation method thereof.
Background
The amino acid glycoside antibiotics (AGs for short) are broad-spectrum antibiotics formed by connecting amino sugar molecules and amino cyclic alcohol through ether bonds, wherein the amino cyclic alcohol molecules and the amino sugar molecules are connected into glycoside through glycosidic bonds. Common species are first generation kanamycin, neomycin, streptomycin, second generation gentamicin, tobramycin, dibekacin, and third generation amikacin, arbekacin, etc.
AGs have wide and approximately same antibacterial spectrum, and the antibacterial action of the AGs has no obvious difference, and has obvious antibacterial effect on various gram-positive bacteria and gram-negative bacteria. Because of low price and strong antibacterial property, the compound feed is often added into feed in veterinary medicine and animal husbandry to treat bacterial enteritis, dairy cow mastitis and the like and promote the growth and propagation of animals and plants. AGs bind to bacterial ribosomes, interfere with the synthesis of bacterial proteins, and disrupt the integrity of the bacterial cell membrane, and are currently one of the important agents for the treatment of aerobic gram-negative bacilli infections.
Toxicology studies show that AGs have ototoxicity, nephrotoxicity, neuromuscular blockade and other toxic and side effects, and long-term consumption of animal products with overproof residues by human beings can cause vestibular dysfunction, auditory nerve injury, nephrotoxicity increase and other side effects, thereby damaging health.
Although the consequences of improper use of aminoglycoside antibiotics are serious, antibiotics are still abused by illegal vendors, and phenomena of antibiotic abuse and environmental pollution are caused. Therefore, the highest residual Limit of aminoglycoside antibiotics (MRL) was established for animal foods in many countries both at home and abroad, as shown in table 1:
TABLE 1 respective national aminoglycoside antibiotics MRLs
The nano gold (AuNPs) refers to gold micro particles, the diameter of which is 1-150 nm, and the shapes of which include spheres, nano rods (AuNRs), nano cages, nano stars or nano shells (AuNSs) and the like. It has large surface area-volume ratio and high molar extinction coefficient (10)8～1010M-1cm-1) The nano-composite material has the characteristics of controllable size, good biocompatibility, high electron density, easily changed surface chemical property, catalysis and the like, can be combined with various biological macromolecules and does not affectMaking the original activity sound.
AuNPs have unique optical and chemical properties. Mainly embodied in that AuNPs have good light absorption and scattering performance. When conduction electrons on the surface of a metal are excited by light of a specific wavelength, collective vibration occurs. This vibration is called Localized Surface Plasmon Resonance (LSPR).
The property of local surface plasmon resonance results in significantly higher absorption and scattering strength of AuNPs than non-plasmonic nanoparticles of the same size. The absorption and scattering properties of AuNPs can be tuned by controlling the size, shape, and local refractive index of the particle surface. The change in LSPR resulted in a shift in the color of AuNPs from wine red to blue-violet with increasing diameter, further manifested by a shift in the spectral absorption band. The LSPR characteristics of AuNPs play an important role for their optical detection, and the LSPR band intensity and frequency size are related to the grain size, shape, inter-particle spacing of AuNPs, and the dielectric constant (refractive index) of the medium. When the analyte interacts with the AuNPs, the LSPR will also change, changing the wavelength of the AuNPs absorption band, the scattering intensity, and the color of the solution. By utilizing the characteristic, the concentration of the target substance can be determined semi-quantitatively by naked eyes or can be determined quantitatively by UV-vis spectrum, fluorescence spectrum and scattered light spectrum. Therefore, the optical detection sensor based on the nano-gold material greatly simplifies the detection process of nucleic acid, protein, small molecules and heavy metal ions.
An array sensor refers to a set of sensors arranged in a geometric pattern for collecting and processing electromagnetic, optical or acoustical signals. A visual array sensor refers to a type of sensor that can directly recognize a light signal with the naked eye. The sensor elements in the array sensor have a different effect on the analyte than in the "lock and key" mode, which is highly specific. The array sensor is used for adding a new dimension, so that more parameters can be estimated and the estimation performance can be improved. Visualization is to make signal reception more convenient and improve detection efficiency.
Visual sensor arrays, also known as photoelectric tongue or nose, have proven to be an excellent analytical method for identifying multiple analytes in biological and environmental samples. The use of cross-reactive sensor elements in sensor array systems, whose inspiration comes from the use of natural arrays of taste and nose receptors, paves the way to simultaneously identify and distinguish target populations. Each sensor element produces a semi-selective reaction in the presence of a particular analyte, and the specificity of the sensor is achieved by a different response pattern of the sensor element to each analyte, and further analyzed by pattern recognition methods.
Jianchanglong et al can observe the color change of the sensor under an ultraviolet lamp through naked eyes, and further estimate the concentration of the antibiotic. They use Eu3+A single-channel fluorescence colorimetric sensor is constructed, and the antibiotic quantitative analysis can be easily carried out without the help of large-scale detection equipment. A visual array sensor is designed by utilizing carbon quantum dots in Gaofei and the like, and the measurement and identification of 14 kinds of saccharides and the classification of 9 kinds of monosaccharides in the saccharide are realized. Lejiao and the like design a colorimetric array sensor taking three enzymes as three channels by utilizing the principle that pesticides inhibit the catalytic action of various enzymes. The sensor can effectively identify and detect pesticide residue in food. Li Zhen, etc. provides a good direction for the formation of in vitro screening model of brain injury drugs. The in vitro blood brain barrier system is constructed by the silicon nanopore array, and the model is successfully used for testing the penetration capability of various antibiotics such as chloramphenicol, ciprofloxacin, erythromycin and the like on the blood brain barrier. However, the detection of aminoglycoside antibiotics using a visual array sensor has not been addressed.
Colorimetry (Colorimetry) is a method of determining the content of a sample by identifying, comparing or measuring the depth of color of a solution of a colored substance. The detection method has the advantages of low cost, convenient operation, high efficiency and capability of realizing visualization. Nanogold is very popular in colorimetric sensors due to its unique optical properties. The AuNPs colorimetric method is an optical detection technology based on the AuNPs surface plasmon resonance effect. It utilizes the interaction between the functional nano gold and the target object to change the size, shape and aggregation state of the gold nano particles, thereby causing the dissolutionThe color, fluorescence and scattering intensity of the liquid are changed, and an excellent measuring platform is provided for the rapid detection of the target object. The colorimetric method can be classified into two major types, i.e., modified and non-modified, according to the presence or absence of modification of the gold nanoparticles. On the way of research on modified nanogold colorimetric method, the Mirkin topic group first synthesizes functionalized nanogold particles, and uses the nanogold particles for DNA detection. The colorimetric method based on modified nano gold particles can realize the purpose of various substances including DNA, protein and organic small molecules by modifying different functionalized molecules on the surfaces of the nano gold particles[26-28]And metal ions[29-30]And the like. As shown in the following figure, different DNA fragments are first modified on the surface of the gold nanoparticles, and when an analyte (complementary DNA fragment) exists, the two gold nanoparticles aggregate, so that the color of the gold nanoparticle solution changes. However, this method requires specific modification on the surface of the gold nanoparticles in advance, and the modified functionalized molecules are different according to the difference of the analyte, which results in higher cost and complex experimental operation of the gold nanoparticle colorimetric method, and may also cause the deactivation of bioactive molecules.
The nano gold colorimetric method without modification does not have the problems. When the classical synthesis method, namely the sodium citrate reduction method, is used for synthesizing the nano gold particles, a layer of citrate ions with negative charges is coated on the surfaces of the nano gold particles. At this time, if a salt solution with a high concentration is added to the nanogold solution, the nanogold particles aggregate, and the color of the solution changes. However, when a DNA single strand exists, the positively charged DNA single strand may adhere to the surface of the gold nanoparticle due to electrostatic interaction, protecting the gold nanoparticle, thereby inhibiting aggregation caused by a salt solution. At this time, if an analyte (complementary DNA fragment) is present, the DNA single strand on the surface of the nanogold binds to the analyte, and the nanogold loses the protection of the DNA single strand, so that the aggregation phenomenon occurs again, and the solution changes color. The colorimetric method based on the nano-gold without modification is simpler than the former colorimetric method, has been applied to a plurality of fields such as DNA detection, protein detection, metal ion detection, small molecule detection and the like, and can realize the simultaneous detection of a plurality of analytes.
Currently, detection aiming at aminoglycoside antibiotics mainly comprises an instrumental analysis method, a microbiological analysis method, an immunoassay method, an aptamer analysis method and the like, and the methods have advantages. The instrument analysis method mainly utilizes an analysis instrument to detect the analyte and has the advantages of high stability, good repeatability, high automation degree and the like. The microbiological analysis method is based mainly on the antibacterial action of antibiotics. The rationale for immunoassay methods is that antigens can specifically bind to antibodies. The detection method has the advantages that the sample does not need to be pretreated, and the detection time is short. The aptamer analysis method has the advantages of strong specificity, low detection limit, high sensitivity and the like. Although the detection methods for aminoglycoside antibiotics are various and have advantages, they have respective disadvantages, such as long time consumption, complicated operation process, large-scale instrument requirement, single detection, and the like. Therefore, a simple, fast and efficient method is urgently needed for various aminoglycoside antibiotics.
Disclosure of Invention
An object of the present invention is to provide a colorimetric array sensor based on DNA-AuNPs system, which is efficient, sensitive and visualized in order to solve the above technical problems.
Another object of the present invention is to provide a method for preparing the colorimetric array sensor.
In order to achieve the above object, the invention provides a colorimetric array sensor based on a DNA-AuNPs system, comprising three sensing units, wherein each sensing unit comprises an aptamer and a gold nanoparticle with negative charges on the surface, and the aptamers of the three sensing units are different and are all aptamers of aminoglycoside antibiotics; the particle diameters of the gold nanoparticles of the three sensing units are the same and are within the range of 10-20 nm.
Compared with the prior art, the invention adopts three known aminoglycoside antibiotics with nucleic acid adaptation and nano-gold particles as three sensing units respectively, constructs the colorimetric array sensor based on the DNA-AuNPs system, and realizes simple, efficient and visual identification of the 5 aminoglycoside antibiotics. The colorimetric array sensor has high sensitivity, can realize effective discrimination under the lowest concentration of 40ng/mL for 5 aminoglycoside antibiotics, and is lower than the national detection standard. Meanwhile, the array sensor obtains a good linear relation within the range of 20-200ng/mL, successfully distinguishes mixed samples of mixed aminoglycoside antibiotics with different proportions, and can also effectively identify aminoglycoside antibiotics in actual milk samples.
According to the colorimetric array sensor based on the DNA-AuNPs system, the particle size of the gold nanoparticles is 10 nm.
According to the colorimetric array sensor based on the DNA-AuNPs system, the molar ratio of the aptamer to the gold nanoparticle in each sensing unit is 25: 9.
According to the colorimetric array sensor based on the DNA-AuNPs system, the nucleic acid aptamers in the three sensing units are obtained by respectively intercepting nucleic acid aptamers with different lengths, wherein the nucleic acid aptamers are tobramycin. The invention adopts three segments of aptamer fragments which are obtained by cutting tobramycin from market, and can be replaced by aptamers of other aminoglycoside antibiotics according to the principle of the invention.
In another aspect, the present invention further provides a preparation method of the colorimetric array sensor based on the DNA-AuNPs system, including the following steps:
s1: reducing and preparing a nano gold particle material with the particle size of 10-20 nm by adopting a sodium citrate method, wherein the surface of the prepared nano gold particle has negative charges;
s2: respectively mixing aptamer solutions of three aminoglycoside antibiotics with the concentration of 10 mu M with NaCl solution with the concentration of 1 mu M, wherein the volume ratio of the aptamer solution to the NaCl solution is 1: 5; and (4) respectively forming three sensing units by the aptamers of the three aminoglycoside antibiotics and the gold nanoparticles prepared in the step S1 to form the colorimetric array sensor based on the DNA-AuNPs system.
Preferably, the particle size of the gold nanoparticles in step S1 is 10 nm.
Preferably, step S1 includes the steps of: 100mL of a 0.01% HAuCl4 solution was transferred to the flask, which was then heated to boiling and stirred rapidly; quickly adding 5mL of ready-prepared trisodium citrate aqueous solution with the mass fraction of 1% while boiling, continuing boiling, removing the heat source and continuing stirring for 15min when the solution changes from deep blue to wine red and keeps stable, and then naturally cooling to room temperature under the stirring condition.
Preferably, the aptamers of the three aminoglycoside antibiotics in step S2 are those of tobramycin, which are obtained by cleaving the aptamers with different lengths. The invention adopts three segments of aptamer fragments which are obtained by cutting tobramycin from market, and can be replaced by aptamers of other aminoglycoside antibiotics according to the principle of the invention.
Preferably, the aptamer sequences of the three aminoglycoside antibiotics in step S2 are: 15 '-TGGGGGTTGAGGCTAAGCCGA-3', 5'-TGGGGGTTGAGGCTA-3', 5'-TGGGGGTTGAGGCTAAGCCGAAGCCGA-3'.
The principle of the nano-gold colorimetric array sensor is as follows: the nano-gold with negative charges on the surface can be combined with single-stranded DNA. When the nano-gold is in a solution with higher salt concentration, the nano-gold is aggregated due to electrostatic interaction. However, when single-stranded DNA is attached to the surface, the single-stranded DNA protects the nanogold from aggregation. When the object to be detected exists, such as aminoglycoside antibiotics, the object to be detected can be combined with single-stranded DNA, because of different types of objects to be detected, the combination conditions are different, the residual DNA amount is different, and the protection conditions of the nano-gold are different, so that different colorimetric signals can be output, and the types of aminoglycoside antibiotics can be identified.
The colorimetric array sensor realizes simple, efficient and visual identification of 5 aminoglycoside antibiotics. Under the optimal experimental conditions, in the experiment of detecting tobramycin, kanamycin and amikacin by a colorimetric method, effective differentiation can be realized under the minimum concentration of 40ng/mL, wherein the detection limit of kanamycin is 3.32ng/mL, the detection limit of amikacin is 3.90ng/mL, the detection limit of tobramycin is 2.38ng/mL and is lower than the national detection standard. Meanwhile, the colorimetric array sensor also obtains a good linear relation in the range of 20-200ng/mL, which shows that the colorimetric array sensor has quantitative detection capability. In addition, the colorimetric array sensor can detect AGs in pure milk diluted by 100 times in an experiment, which shows that the constructed nanogold colorimetric array sensor has good detection performance on AGs in an actual sample.
Drawings
FIG. 1 is a graph of the ultraviolet-visible light spectrum of 10nm gold nanoparticles
FIG. 2 is a particle size distribution diagram of 10nm gold nanoparticles
FIG. 3 is Zeta potential diagram of 10nm gold nanoparticles
FIG. 4 is a UV-VIS spectrum of a system with DNA concentrations of 0, 2.5, 5, 7.5, 10, and 20nM
FIG. 5 shows the absorbance at 520nM of the system at DNA concentrations of 0, 2.5, 5, 7.5, 10, and 20nM
FIG. 6 is a graph of Linear Discriminant Analysis (LDA) of 5 aminoglycoside antibiotics (40ng/mL) by an array sensor
FIG. 7 is a LDA chart of TOB at different concentrations (20, 50, 80, 100, 150, 200ng/mL)
FIG. 8 is a LDA chart of KM at various concentrations (20, 50, 80, 100, 150, 200ng/mL)
FIG. 9 is a LDA graph of AMK at different concentrations (20, 50, 80, 100, 150, 200ng/mL)
FIG. 10 is a graph showing the relationship between the influence factor 1 and the TOB concentration
FIG. 11 is a graph showing the relationship between influence factor 1 and KM concentration
FIG. 12 is a graph showing the relationship between the influence factor 1 and the AMK concentration
FIG. 13 is a LDA chart of KM and TOB mixed samples in different proportions
FIG. 14 is a LDA chart of actual samples to which KM and TOB were added at different concentrations
FIG. 15 is a histogram of specific recognition of array sensors
Detailed Description
The present invention will be further described with reference to the following examples. It should be understood that the following examples are illustrative of the present invention only, and are not intended to limit the scope of the present invention.
The reagents and materials used in the following examples, test examples and experimental examples are shown in Table 2, and the instruments and equipment are shown in Table 3.
TABLE 2 reagents and materials
TABLE 3 instruments and apparatus
Example 1: preparation of colorimetric array sensor based on DNA-AuNPs system
A colorimetric array sensor based on a DNA-AuNPs system is prepared according to the following steps:
s1: the nano-gold particle material with the particle size of 10nm is prepared by reduction with a sodium citrate method, and the surface of the prepared nano-gold particle has negative charges. The specific experimental steps are as follows: remove 100mL of 0.01% HAuCl4Putting the solution into a flask, heating to boil, and rapidly stirring; quickly adding 5mL of ready-prepared trisodium citrate aqueous solution with the mass fraction of 1% while boiling, continuing boiling, removing the heat source and continuing stirring for 15min when the solution changes from deep blue to wine red and keeps stable, and then naturally cooling to room temperature under the stirring condition.
S2: aptamer solutions (Apt 1, Apt2 and Apt3 in Table 2) of three aminoglycoside antibiotics with a concentration of 10 μ M were mixed with NaCl solution with a concentration of 1 μ M, respectively, at a volume ratio of the aptamer solution to the NaCl solution of 1: 5; and (4) respectively forming three sensing units by the aptamers of the three aminoglycoside antibiotics and the gold nanoparticles prepared in the step S1 to form the colorimetric array sensor based on the DNA-AuNPs system. Wherein, the aptamers of the three aminoglycoside antibiotics are obtained by respectively intercepting the different lengths of the aptamers of the tobramycin, and the sequence of Apt1 is as follows: 5'-TGGGGGTTGAGGCTAAGCCGA-3', the sequence of Apt2 is: 5'-TGGGGGTTGAGGCTA-3', the sequence of Apt3 is: 5'-TGGGGGTTGAGGCTAAGCCGAAGCCGA-3' are provided.
Test example 1: characterization of the Nano-gold Material
In order to confirm the successful synthesis of the 10nm nano-gold material, an ultraviolet absorption spectrogram (UV-vis) and a Zeta potential are adopted to characterize the nano-gold material
UV-vis Spectroscopy characterization
The UV-vis spectrogram of the 10nm nanogold material prepared in example 1 is shown in figure 1, and it can be seen from figure 1 that the maximum ultraviolet absorption peak of 10nm AuNPs is about 520nm, the color of the solution is wine red, which is basically consistent with the literature report, and the prepared AuNPs have the optical property of 10 nm.
Zeta potential
FIG. 2 is a particle size distribution diagram of 10nm AuNPs, which shows that the particle size is mainly 10-15nm, which is basically consistent with the expected result, and the synthesis of 10nm AuNPs is successful.
The Zeta potential of the prepared 10nm AuNPs is shown in figure 3, the AuNPs in example 1 are prepared by a classical sodium citrate reduction method, and a layer of citrate ions is wrapped on the surfaces of the AuNPs, so that the surfaces of the synthesized AuNPs are negatively charged, which is beneficial to being combined with positively charged single-stranded DNA and preventing the AuNPs from aggregating to cause color change under higher salt concentration.
Experimental example 1: optimization of DNA concentration
In order to construct a colorimetric array sensor based on the DNA-AuNPs system, the present experimental example optimizes the concentration of DNA.
And (3) taking 100 mu L of NaCl solution with the concentration of 1 mu M, adding 0, 5, 10, 15, 20 and 40 mu L of Apt1 solution respectively, diluting to 200 mu L by using PBS buffer solution, oscillating, standing and reacting for 15min, adding 1800 mu L of nano gold solution, reacting for 30min, and recording the absorption intensity of the mixed solution at 520nm by using an ultraviolet-visible spectrophotometer.
In order to ensure that the aptamer has enough protection capability on AuNPs, the aptamer completely covers the AuNPs, and aggregation and discoloration caused by adding a high-concentration sodium chloride solution due to incomplete coverage are avoided. Therefore, optimization of the amount of the aptamer is required. The results of setting the DNA concentrations to 0, 2.5, 5, 7.5, 10, and 20nM are shown in FIGS. 4 to 5. As compared with the blank sample, the absorbance at 520nM gradually increased with the increase of the DNA concentration, and the absorbance at 520nM was the maximum value when the DNA concentration was 10nM, so that the system selected in example 1 had a DNA concentration of 10nM and was added in an amount of 20. mu.L of a 10. mu.M DNA solution.
Experimental example 2: detection of aminoglycoside antibiotics using colorimetric array sensor based on DNA-AuNPs system
The invention takes the colorimetric reaction of AuNPs as a sensing principle, selects three aptamers (Apt 1, Apt2 and Apt3) with different sequences and lengths and 10nmAUNPs as three DNA recognition units respectively to construct a sensor, and realizes the sensitive and efficient visual detection of aminoglycoside antibiotics. Five common aminoglycoside antibiotics (40ng/mL) with wide application are selected in the experimental example to test the performance of the array sensor.
mu.L of NaCl solution with a concentration of 1. mu.M was mixed with 20. mu.L of Apt1, Apt2 and Apt3 solutions with a concentration of 10. mu.M, 8. mu.L of sample solutions with a concentration of 40ng/mL (streptomycin (SM), Gentamicin (GM), Amikacin (AMK) and Tobramycin (TOB) Kanamycin (KM), respectively) was added, and the mixture was diluted to 200. mu.L with PBS buffer solution, allowed to stand with shaking for 15min, and 1800. mu.L of nanogold solution was added and reacted for 30 min.
Under the optimal reaction conditions, the colorimetric sensing array is used for identifying five aminoglycoside antibiotics. By the difference of the colors RGB before and after the reaction, a visual colorimetric map of each aminoglycoside antibiotic is obtained. Each aminoglycoside antibiotic has different colorimetric phenomena and can be used for visual differentiation.
And (3) further analyzing the recognition effect of the array sensor on the aminoglycoside antibiotics by adopting LDA. The 5 aminoglycoside antibiotics are respectively subjected to 4 repeated experiments on the array sensor, and influence factors of 3 sensing units are respectively 97.6%, 2.3% and 0.1% obtained by processing through SPSS software. FIG. 6 is a linear discriminant analysis three-dimensional scattergram of aminoglycosides, showing that five aminoglycoside antibiotics can be clearly separated, indicating that the array sensor has a good distinguishing effect, indicating that the colorimetric sensor array can successfully realize the distinguishing and identification of five aminoglycoside antibiotics.
By analyzing the differential response clustering heatmap, it can be obtained that four parallel samples of each aminoglycoside antibiotic are clustered into small clusters, and that there is substantially no cross or clustering error between the parallel samples. In addition, analysis shows that the combination effect of the sensing unit Apt1 on Streptomycin (SM) and Gentamicin (GM) and the combination effect of the sensing unit Apt2 on Amikacin (AMK) and Tobramycin (TOB) are the most obvious, which proves that the colorimetric sensor is feasible for detecting aminoglycoside antibiotics.
Experimental example 3: quantitative detection of aminoglycoside antibiotics by array sensor
In order to further test the detection and analysis capability of the array sensor, the array sensor is applied to the quantitative detection of aminoglycoside antibiotics, the experimental example takes tobramycin, kanamycin and amikacin as examples to verify the quantitative detection capability of the colorimetric array sensor,
100 mu L of NaCl solution with the concentration of 1 mu M is taken and respectively mixed with 20 mu L of three aptamer solutions with the concentration of 10 mu M, 4, 10, 16, 20 and 40 mu L of kanamycin solution (or amikacin and tobramycin) with the concentration of 10 mu g/ml are respectively added, the mixture is diluted to 200 mu L by PBS buffer solution, the mixture is shaken and kept still for reaction for 15min, 1800 mu L of nanogold solution is added for reaction for 30min, the experiment is repeated for 6 times, and the absorption intensity of the mixed solution at 520nm and 650nm is recorded by using an ultraviolet-visible spectrophotometer. All data were processed using SPSS v16.0 software to obtain Linear Discriminant Analysis (LDA) results.
As shown in FIGS. 7-9, each aminoglycoside antibiotic produced a specific response pattern at different concentrations and grouped into unique groups without errors or misclassifications. These results indicate that the sensor array also has good ability to recognize aminoglycoside antibiotics over a wide range of concentrations. And obtaining a quantitative response curve of the antibiotic by drawing the relation between the influence factor 1 and the antibiotic concentration. As shown in FIGS. 10-12, the linear relationship of the concentration-response curves indicates that the interaction between the recognition units and the antibiotics is uniform, regular, stable, and that the larger the typical factor 1, the stronger the interaction. The detection limit of kanamycin, amikacin and tobramycin was calculated to be 3.32ng/mL, 3.90ng/mL and 2.38ng/mL, respectively.
Experimental example 4: detection of mixed samples by array sensor
In order to test the multiplex detection capability of the sensor array, mixed aminoglycoside antibiotic mixed samples with different ratios were tested. This example attempted to distinguish two different groups of aminoglycoside antibiotics (total concentration 80ng/mL) from a mixed sample of antibiotics at different ratios.
100 mu L of NaCl solution with the concentration of 1 mu M is taken and respectively mixed with 20 mu L of three aptamer solutions with the concentration of 10 mu M, 8 mu L of mixed solution of kanamycin and tobramycin with the total concentration of 80ng/ml, which is mixed according to the proportion of 0:10, 1:9, 3:7, 5:5, 7:3, 9:1 and 10:0, is respectively added, the mixed solution is diluted to 200 mu L by PBS buffer solution, the mixed solution is oscillated and stood for reaction for 15min, 1800 mu L of nanogold solution is added for reaction for 30min, the experiment is repeated for 6 times, and the absorption intensity of the mixed solution at 520nm and 650nm is recorded by using an ultraviolet-visible spectrophotometer. All data were processed using SPSS v16.0 software to obtain Linear Discriminant Analysis (LDA) results.
As shown in fig. 13, pooling mixtures of different ratios into different groups and separating all groups demonstrates the multiple recognition capabilities of the sensor array.
Experimental example 5: simulating real sample testing
In order to further test the universality and the identification capability of the array sensor and the detection capability of the aminoglycoside antibiotics in the actual milk sample, after the milk sample is processed, tobramycin with different concentrations is added into the milk sample, kanamycin and tobramycin with different concentrations are added into the milk sample, and a labeled sample is prepared.
100 mu L of NaCl solution with the concentration of 1 mu M is taken and respectively mixed with 20 mu L of three aptamer solutions with the concentration of 10 mu M, 8 mu L of kanamycin spiked samples with the concentrations of 0, 10 and 50 mu M and 8 mu L of tobramycin spiked samples with the concentrations of 0, 10 and 50 mu M are respectively added, the mixture is diluted to 200 mu L by PBS buffer solution, the mixture is oscillated and stood for reaction for 15min, 1800 mu L of nanogold solution is added for reaction for 30min, the experiment is repeated for 6 times, and the absorption intensity of the mixed solution at 520nm and 650nm is recorded by using an ultraviolet-visible spectrophotometer. All data were processed using SPSS v16.0 software to obtain Linear Discriminant Analysis (LDA) results.
As shown in fig. 14, the array can accurately distinguish whether aminoglycoside antibiotics exist in an actual milk sample, and meanwhile, two aminoglycoside antibiotics can also well identify different linear changes in LDA, and the classification accuracy reaches 100% according to the folding classification matrix. Needless to say, the array sensor can detect milk samples containing aminoglycoside antibiotics with different concentrations according to positioning information.
Experimental example 6: specific recognition of aminoglycoside antibiotics by array sensor
In order to verify the specificity of the constructed array sensor to aminoglycoside antibiotics in sample detection, other five different classes of antibiotics are respectively selected, including tetracycline, norfloxacin, amoxicillin, thiamphenicol and doxycycline. Tobramycin and the five antibiotics were detected using an array sensor at a concentration of 100 ng/ml.
Taking 100 mu L of NaCl solution with the concentration of 1 mu M, respectively mixing with 20 mu L of three aptamer solutions with the concentration of 10 mu M, respectively adding 8 mu L of tobramycin, tetracycline, norfloxacin, doxycycline, thiamphenicol and amoxicillin solution with the concentration of 100ng/ml, diluting to 200 mu L with PBS buffer solution, oscillating, standing and reacting for 15min, then adding 1800 mu L of nanogold solution, reacting for 30min, repeating the experiment for 6 times, and recording the absorption intensity of the mixed solution at 520nm and 650nm by using an ultraviolet-visible spectrophotometer. All data were processed using SPSS v16.0 software to obtain Linear Discriminant Analysis (LDA) results.
The k value is shown in fig. 15, and the k value of tobramycin is much larger than that of other antibiotics, which indicates that only nanogold in the system added with tobramycin is aggregated. This indicates that the array sensor has the ability to specifically recognize only aminoglycoside antibiotics, and other antibiotics can not interfere with the detection of aminoglycoside antibiotics by the sensor.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
The above description is only a partial example of the present invention, and does not limit the embodiments and the protection scope of the present invention, therefore, it should be recognized that the present invention is covered by the protection scope of the present invention by the equivalent substitution and obvious change made by the description of the present invention for those skilled in the art.
Claims (9)
1. A colorimetric array sensor based on a DNA-AuNPs system is characterized in that: the sensor comprises three sensing units, wherein each sensing unit comprises a nucleic acid aptamer and gold nanoparticles with negative charges on the surfaces, and the nucleic acid aptamers of the three sensing units are different and are all the nucleic acid aptamers of aminoglycoside antibiotics; the particle diameters of the gold nanoparticles of the three sensing units are the same and are within the range of 10-20 nm.
2. The colorimetric array sensor of claim 1, wherein: the particle size of the nano gold particles is 10 nm.
3. The colorimetric array sensor of claim 1, wherein: the molar ratio of the aptamer to the gold nanoparticle in each sensing unit is 25: 9.
4. The colorimetric array sensor of claim 1, wherein: the aptamer in the three sensing units is obtained by respectively intercepting the aptamer of tobramycin with different lengths.
5. A preparation method of a colorimetric array sensor based on a DNA-AuNPs system is characterized by comprising the following steps: the method comprises the following steps:
s1: reducing and preparing a nano gold particle material with the particle size of 10-20 nm by adopting a sodium citrate method, wherein the surface of the prepared nano gold particle has negative charges;
s2: respectively mixing aptamer solutions of three aminoglycoside antibiotics with the concentration of 10M and NaCl solution with the concentration of 1 mu M, wherein the volume ratio of the aptamer solution to the NaCl solution is 1: 5; and (4) respectively forming three sensing units by the aptamers of the three aminoglycoside antibiotics and the gold nanoparticles prepared in the step S1 to form the colorimetric array sensor based on the DNA-AuNPs system.
6. The method of claim 5, wherein: the particle size of the gold nanoparticles in step S1 was 10 nm.
7. The method of claim 6, wherein: step S1 includes the following steps: 100ml of 0.01% HAuCl was removed4Putting the solution into a flask, heating to boil, and rapidly stirring; quickly adding 5mL of ready-prepared trisodium citrate aqueous solution with the mass fraction of 1% while boiling, continuing boiling, removing the heat source and continuing stirring for 15min when the solution changes from deep blue to wine red and keeps stable, and then naturally cooling to room temperature under the stirring condition.
8. The method of claim 6, wherein: the aptamers of the three aminoglycoside antibiotics in step S2 are obtained by truncating the aptamers of tobramycin to different lengths.
9. The method of claim 8, wherein: the aptamer sequences of the three aminoglycoside antibiotics in step S2 are: 15 '-TGGGGGTTGAGGCTAAGCCGA-3', 5'-TGGGGGTTGAGGCTA-3', 5'-TGGGGGTTGAGGCTAAGCCGAAGCCGA-3'.
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