A cellulose-based fluorescent compound, its preparation method, its use, and a bamboo shoot cellulose fluorescence detection test strip prepared therefrom

Abstract

The present invention discloses a cellulose-based fluorescent compound, a preparation method thereof, a use thereof, and a bamboo shoot cellulose fluorescence detection test paper prepared therefrom. The cellulose-based fluorescent compound has the following structural formula: The cellulose-based fluorescent compound of the present invention is prepared by reacting cellulose with 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]-2-naphthoic acid at room temperature, with low energy consumption, simple operation, high repeatability, and being easy for large-scale production; the cellulose-based fluorescent compound of the present invention can be used for the rapid qualitative and quantitative detection of the concentration of Fe<supgt;3+< / supgt>, can also be used for the rapid detection of alkalinity, and can also be used for the preparation of anti-counterfeiting label paper.

Description

Technical Field

[0001] The present invention relates to a cellulose-based fluorescent compound, a preparation method thereof, a use thereof, and a bamboo shoot cellulose fluorescent test strip prepared therefrom, belonging to the technical field of cellulose-based fluorescent compounds. Background Art

[0002] Cellulose is a macromolecular polysaccharide composed of glucose, mainly derived from plants such as bamboo shoots and wood. It is the most widely distributed and largest reserve natural polymer material in nature, with advantages such as good biocompatibility, renewability, and biodegradability. The development and utilization of cellulose derivatives have become a research hotspot of cellulose materials, and the main products include cellulose ethers, cellulose esters, cellulose ether esters, etc., which have been applied in the fields of medicine, coatings, membrane technology, construction, optoelectronic materials, etc.

[0003] Iron is one of the most important elements for humans to complete normal physiological functions. The main methods for detecting iron ions include atomic absorption method, potassium dichromate method, spectrophotometry, fluorescence spectroscopy, etc. Among them, fluorescence spectroscopy can quickly achieve qualitative and quantitative detection, with relatively strong advantages. At the same time, developing new fluorescent compounds and using fluorescence method to quickly judge the acidity and alkalinity of unknown substances or solutions also has very good application prospects. Therefore, the inventors developing an organic polymer fluorescent probe from cellulose and preparing a cellulose-based fluorescent qualitative test strip is of great significance for the development and utilization of natural cellulose. Summary of the Invention

[0004] The present invention provides a cellulose-based fluorescent compound, a preparation method thereof, a use thereof, and a bamboo shoot cellulose fluorescent test strip prepared therefrom. The present invention obtains a brand-new cellulose-based fluorescent compound, which can be used for rapid qualitative and quantitative detection of iron ions.

[0005] To solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A cellulose-based fluorescent compound, the structural formula of which is:

[0007] Wherein, R is H or Et.

[0008] The inventors found that using NaOH can enhance the fluorescence intensity of the above cellulose-based fluorescent compound.

[0009] The synthesis route of the above cellulose-based fluorescent compound is:

[0010]

[0011] The cellulose used in this application is preferably bamboo shoot cellulose or ethyl cellulose, etc.

[0012] As one of the preferred embodiments, the preparation method of the above cellulose-based fluorescent compound includes the following steps:

[0013] 1) Mix bamboo shoot cellulose or ethyl cellulose, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]-2-naphthoic acid, 4-dimethylaminopyridine (DMAP), and N,N-dimethylformamide (DMF) evenly to obtain a reaction solution;

[0014] 2) Drop the N,N'-dicyclohexylcarbodiimide solution dissolved in N,N-dimethylformamide into the reaction solution, react at room temperature for 24 - 50 h, add distilled water, precipitate a solid, and then wash and dry to obtain the cellulose-based fluorescent compound.

[0015] After the above solid is precipitated, first filter out the solid, then wash the solid. After washing, dry the obtained solid (the filtered solid) to obtain the cellulose-based fluorescent compound.

[0016] To improve the product yield, in the above step 1), the mass ratio of bamboo shoot cellulose or ethyl cellulose to 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]-2-naphthoic acid is 1:(0.12 - 0.50), the mass ratio of ethyl cellulose to 4-dimethylaminopyridine is 1:(0.03 - 0.05), and the mass-volume ratio of ethyl cellulose to N,N-dimethylformamide is 1 g:(28 - 32) mL.

[0017] The mass ratio of the above bamboo shoot cellulose or ethyl cellulose to N,N'-dicyclohexylcarbodiimide is 1:(0.20 - 0.28); in step 2), the mass-volume ratio of N,N'-dicyclohexylcarbodiimide to N,N-dimethylformamide is (0.20 - 0.28) g:(18 - 22) mL; in step 2), the purification method is: add distilled water to the obtained reaction material, precipitate a solid, and then filter, wash, and dry to obtain the cellulose-based fluorescent compound.

[0018] The above cellulose-based fluorescent compound can be used for the rapid fluorescence detection of ferric ions. Especially for the rapid fluorescence detection of ferric ions in bamboo shoots.

[0019] For the rapid fluorescence detection of ferric ions in bamboo shoots, the specific method is: dry the sample to be detected, and ash it into white in a high-temperature furnace at 550 - 600 °C. After cooling, add concentrated nitric acid and perchloric acid with a volume ratio of 10:1. First, digest at a low temperature of 60 - 120 °C, then heat to 600 °C, evaporate until the fumes are exhausted, cool, dissolve with hydrochloric acid, filter, add the solution of cellulose-based fluorescent compound 1 to the filtrate to obtain the test solution. The concentration of cellulose-based fluorescent compound 1 in the test solution is 0.05 mg / mL, and use fluorescence spectrometry to measure Fe in the test solution3+ Content (including Fe 3+ The detection solution emits a faint green fluorescence under ultraviolet light at 365 nm); among them, the concentration of concentrated nitric acid is 1.40 - 1.44 g / mL, and the concentration of perchloric acid is 1.64 - 1.68 g / mL.

[0020] When used for the rapid fluorescence detection of ferric ions in bamboo shoots, etc., it can be first cut into thin slices or small pieces to facilitate subsequent processing.

[0021] At an excitation wavelength of 350 nm, at emission wavelengths of 421 nm and 483.5 nm, as the 3+ concentration of Fe gradually increases, the fluorescence intensity of the fluorescence spectrum gradually increases. Quantitative detection of the Fe 3+ concentration can be carried out.

[0022] At an emission wavelength of 421 nm, the linear relationship between the fluorescence intensity and the Fe 3+ concentration is: y = 75.194x + 193.77, at an emission wavelength of 483.5 nm, the linear relationship between the fluorescence intensity and the Fe 3+ concentration is: y = 27.158x + 53.329, where x is the Fe 3+ concentration and y is the fluorescence intensity. The rapid quantitative detection of the Fe 3+ concentration can be carried out using the aforementioned linear relationship.

[0023] The above cellulose-based fluorescent compound can be used for the rapid detection of alkalinity.

[0024] When used for the detection of alkalinity, the object to be detected is dropped into the ethanol solution of the cellulose-based fluorescent compound. If the solution color changes from purple-red to lighter or the purple color disappears, and / or the solution can emit strong green fluorescence under ultraviolet light at 365 nm, then the object to be detected is alkaline.

[0025] When used for the preparation of anti-counterfeiting labels, the fiber paper is soaked in the solution of cellulose-based fluorescent compound 1 or the solution of cellulose-based fluorescent compound 1 is printed or written on the fiber paper, and then dried naturally. The soaked part, printed or written part (i.e., the part with cellulose-based fluorescent compound 1) emits purple fluorescence under ultraviolet light at 254 nm. For the aforementioned solution of cellulose-based fluorescent compound 1, the solvent used is ethanol.

[0026] A bamboo shoot cellulose fluorescence detection test paper is obtained by soaking bamboo fiber paper in the ethanol solution of the above cellulose-based fluorescent compound at 0.8 - 1.2 mg / mL for 3 - 8 min, and then taking it out and drying it naturally.

[0027] The above bamboo shoot cellulose fluorescence detection test paper is used for the rapid detection of ferric ions, and / or for the detection of alkalinity; and / or for the production of anti-counterfeiting label paper.

[0028] When used for the detection of alkalinity, the solution to be detected is dropped onto the test paper. If obvious green fluorescence can be seen under a 365 nm ultraviolet lamp, the substance to be detected is alkaline. If there is no green fluorescence, the substance to be detected is not alkaline.

[0029] When used for the detection of ferric ions, the solution to be detected is dropped onto the test paper. Under a 365 nm ultraviolet lamp, if the bamboo cellulose fluorescence test paper emits light green fluorescence, it indicates that the solution to be detected contains ferric ions.

[0030] When used for anti-counterfeiting label paper, the anti-counterfeiting label paper emits purple fluorescence under a 254 nm ultraviolet lamp and the image is clear.

[0031] Technologies not mentioned in the present invention shall refer to the prior art.

[0032] The cellulose-based fluorescent compound of the present invention can be prepared by reaction at room temperature, with low energy consumption, simple operation, high reproducibility and easy large-scale production; the cellulose-based fluorescent compound of the present invention can be used for the rapid qualitative and quantitative detection of Fe 3+ concentration, can also be used for the rapid detection of alkalinity, and can also be used for the preparation of anti-counterfeiting label paper. Description of the Drawings

[0033] Figure 1 It is the infrared spectrum diagram of the cellulose-based fluorescent compound 1 of the present invention;

[0034] Figure 2 It is the influence of different excitation wavelengths on the fluorescence intensity of the cellulose-based fluorescent compound 1 (concentration is 0.5*10 -5 M);

[0035] Figure 3 It is the experimental result diagram of the fluorescence enhancement selectivity of the cellulose-based fluorescent compound 1 interacting with different ions (excitation wavelength 350 nm);

[0036] Figure 4 It is the influence diagram of different ions on the fluorescence intensity of the compound 1+Fe 3+ system;

[0037] Figure 5 It is the linear relationship diagram of the fluorescence intensity of the cellulose-based fluorescent compound 1 for the Fe 3+ system and the Fe 3+ concentration;

[0038] Figure 6 It is the fluorescence lifetime diagram of the cellulose-based fluorescent compound 1;

[0039] Figure 7The physical pictures of the cellulose-based fluorescent compound 1 solution before and after the addition of NaOH (the left picture is before titration, and the right picture is after titration);

[0040] Figure 8 The fluorescence effect pictures of the cellulose-based fluorescent compound 1 solution before and after the addition of NaOH (the left picture is before titration, and the right picture is after titration);

[0041] Figure 9 The fluorescence pictures of the test paper before and after the addition of NaOH (the left picture is before titration, and the right picture is after titration);

[0042] Figure 10 The irradiation effect of the pattern prepared from the cellulose-based fluorescent compound 1 under a 254 nm ultraviolet lamp; Detailed implementation mode

[0043] To better understand the present invention, the content of the present invention will be further clarified below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments only.

[0044] In each example, unless otherwise specified, the operations are all carried out at room temperature (20 - 25 °C).

[0045] Example 1

[0046] Preparation of cellulose-based fluorescent compound 1:

[0047] Add 1.00 g of ethyl cellulose (brand: Amis, model: EC, first-class product, Guangdong Yuemei Chemical Co., Ltd.), 0.15 g of 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]-2-naphthoic acid, 0.04 g of 4-dimethylaminopyridine (DMAP), and 30 mL of N,N-dimethylformamide (DMF) into a single-necked flask, and mix evenly under magnetic stirring. Then, slowly add 20 mL of a solution of N,N'-dicyclohexylcarbodiimide (DCC, 0.24 g) dissolved in N,N-dimethylformamide (DMF) dropwise to the reaction solution, and carry out the reaction at room temperature for 30 h. After the reaction is completed, add 200 mL of distilled water to precipitate the solid, and then obtain cellulose-based fluorescent compound 1 through suction filtration, washing, and drying, with a yield of 86.7%. The infrared spectrum is as Figure 1 shown, FT-IR (KBr) ν (cm -1 ): 3466, 3330, 2975, 2929, 2851, 1628, 1577, 1536, 1447, 1377, 1273, 1087, 891, 754. It is proved that the following has been successfully synthesized:

[0048] After expanding the materials in the above example by 1000 times and repeating the preparation 3 times, the yields are all above 86%. The infrared spectrum of the prepared cellulose-based fluorescent compound 1 is the same as that ofFigure 1 There is no substantial difference and it will not be provided repeatedly, demonstrating that the preparation of the cellulose-based fluorescent compound 1 in this application has good repeatability and is easy to scale up production.

[0049] Example 2

[0050] Investigate the influence of different excitation wavelengths on the fluorescence intensity of cellulose-based fluorescent compound 1:

[0051] Dissolve cellulose-based fluorescent compound 1 in absolute ethanol to prepare a solution with a concentration of 0.5×10 -5 g / mL. Measure the fluorescence spectra at different excitation wavelengths (310, 330, 350, 350 nm) on a fluorescence spectrometer. The results are as Figure 2 shown. It can be seen from Figure 2 that when the excitation wavelength is 350 nm, the peak value is the highest in the range of 375 - 450 nm, indicating the strongest fluorescence. Therefore, the excitation wavelength is determined to be 350 nm.

[0052] Example 3

[0053] Investigate the fluorescence enhancement selectivity of cellulose-based fluorescent compound 1 when interacting with different ions:

[0054] To further study the fluorescence selectivity of cellulose-based fluorescent compound 1 towards different substances, with the solvent being absolute ethanol in all cases, the fluorescence intensity of cellulose-based fluorescent compound 1 (with a concentration of 5×10 -5 g / mL) was measured, as well as the fluorescence intensity of cellulose-based fluorescent compound 1 (with a concentration of 5×10 -5 g / mL) + other substances (with a concentration of 5×10 -5 M). The other substances are Ca 2+ , Cd 2+ , Co 2 + , Cr 3+ , Fe 3+ , Fe 2+ , Al 3+ , K + , Mn 2+ , Na + , Pb 2+ , Cu 2+ , Zn 2+ , Mg 2+ , Li + , Ac - , Br - , Cl - , F - , CO3 2- , H2PO4 - , HSO3 2- , HSO4 -, SO3 2- , SO4 2- , HS - , S 2- , ClO - , H2O2, etc., the excitation wavelength is 350 nm, and the results are as Figure 3 shown. It can be seen from Figure 3 that the addition of Fe 3+ can significantly enhance the fluorescence intensity of cellulose-based fluorescent compound 1, and the influence of other substances on the fluorescence intensity of cellulose-based fluorescent compound 1 is not significant. Thus, it can be proved that cellulose-based fluorescent compound 1 can be used for the detection of Fe 3+ without interference.

[0055] As Figure 4 shown, other ions are added to the cellulose-based fluorescent compound 1 + Fe 3+ system (the concentrations of compound 1 and each ion are both 5 * 10 -5 g / mL) to measure the influence of other ions on the fluorescence intensity of the cellulose-based fluorescent compound 1 + Fe 3+ system. The results are as Figure 4 shown. In the figure, 1 in the abscissa represents cellulose-based fluorescent compound 1, 2 represents cellulose-based fluorescent compound 1 + Fe 3+ , 3 represents cellulose-based fluorescent compound 1 + Fe 3+ + Al 3+ , 4 represents cellulose-based fluorescent compound 1 + Fe 3+ + Ca 2+ , 5 represents cellulose-based fluorescent compound 1 + Fe 3+ + Cd 2+ , 6 represents cellulose-based fluorescent compound 1 + Fe 3+ + Co 2+ , 7 represents cellulose-based fluorescent compound 1 + Fe 3+ + Cr 3+ , 8 represents cellulose-based fluorescent compound 1 + Fe 3+ + Cu 2+ , 9 represents cellulose-based fluorescent compound 1 + Fe 3+ + Fe 2+ , 10 represents cellulose-based fluorescent compound 1 + Fe 3+ + K + , 11 represents cellulose-based fluorescent compound 1 + Fe 3+ + Li + , 12 represents cellulose-based fluorescent compound 1 + Fe 3+ + Mg 2+ , 13 represents cellulose-based fluorescent compound 1 + Fe 3+ + Mn 2+ , 14 represents cellulose-based fluorescent compound 1 + Fe3+ +Na + , where 15 represents the cellulose-based fluorescent compound 1 + Fe 3+ +Pb 2+ , where 16 represents the cellulose-based fluorescent compound 1 + Fe 3+ +Zn 2+ . It can be seen from Figure 4 that other ions have little effect on the fluorescence intensity of the compound 1 + Fe 3+ system.

[0056] Example 4

[0057] Examine the linear relationship between the fluorescence intensity of the cellulose-based fluorescent compound 1 and the Fe 3+ concentration in the system: 3+ Using absolute ethanol as the solvent, the excitation wavelength is 350 nm, and the concentration of the cellulose-based fluorescent compound 1 is maintained at 5 * 10

[0058] g / mL. As the Fe -5 concentration gradually increases slowly, the fluorescence intensity (421 nm, 483.5 nm) gradually increases and shows a good linear relationship. The results are as 3+ shown. It can be seen from Figure 5 that the linear relationship between the fluorescence intensity at 421 nm and the Fe Figure 5 concentration is: y = 75.194x + 193.77, R 3+ = 0.9809 (Fe 2 concentration: 0 - 7.0 μM), and the linear relationship between the fluorescence intensity at 483.5 nm and the Fe 3 concentration is: y = 27.158x + 53.329, R 3+ = 0.9933 (Fe 2 concentration: 0 - 11.0 μM). 3

[0059] Example 5

[0060] The cellulose-based fluorescent compound 1 is used for the detection of Fe 3+ in bamboo shoots:

[0061] The fresh Fargesia murielae bamboo shoots are sliced thinly, 100 g is taken and dried at 45 °C, then put into a crucible and transferred into a high-temperature furnace at 600 °C to be ashed into white. After cooling, 5 mL of concentrated nitric acid (1.42 g / mL) and 0.5 mL of perchloric acid (1.66 g / mL) are added. First, it is digested at a low temperature of 80 °C, then heated to 600 °C and evaporated until the fumes are exhausted. The residue is dissolved with 5 mL of hydrochloric acid (15%), 15 mL of deionized water is added, and after filtration, it is transferred into a 25 mL volumetric flask and diluted to the mark with water and shaken well to obtain the test solution. Take 1.0 mL of the test solution and 1.0 mL of the ethanol solution of cellulose-based fluorescent compound 1 with a concentration of 0.5 mg / mL in a 10 mL volumetric flask, and make up the volume with absolute ethanol. The content of Fe is determined by fluorescence spectrometry. Among them, the concentration of cellulose-based fluorescent compound 1 is 0.05 mg / mL, and quantitative detection is carried out using the linear relationships obtained above (421 nm: y = 75.194x + 193.77 and 483.5 nm: y = 27.158x + 53.329). The excitation wavelength is 350 nm, and the results are shown in Table 1. The results measured by the existing mature ICP-MS method are also shown in Table 1. 3+ The content of Fe is determined by fluorescence spectrometry. Among them, the concentration of cellulose-based fluorescent compound 1 is 0.05 mg / mL, and quantitative detection is carried out using the linear relationships obtained above (421 nm: y = 75.194x + 193.77 and 483.5 nm: y = 27.158x + 53.329). The excitation wavelength is 350 nm, and the results are shown in Table 1. The results measured by the existing mature ICP-MS method are also shown in Table 1.

[0062] Table 1 Detection of iron content in Fargesia murielae bamboo shoots

[0063]

[0064] Dissolve cellulose-based fluorescent compound 1 in absolute ethanol to prepare a solution with a concentration of 5×10 -5 g / mL. Measure the fluorescence emission spectra with different Fe 3+ concentration ions on a fluorescence spectrometer. The excitation wavelength is 350 nm. As the Fe 3 + concentration gradually increases, the fluorescence signal intensity gradually increases, and the detection limit for Fe 3+ reaches 1×10 -8 M.

[0065] Example 6

[0066] Detection of the fluorescence lifetime of cellulose-based fluorescent compound 1:

[0067] Using absolute ethanol as the solvent, prepare 2 solutions of cellulose-based fluorescent compound 1 and 1 + Fe 3+ . Among them, the concentration of cellulose-based fluorescent compound 1 is 5×10 -5 g / mL, and the concentration of Fe 3+ is 5×10 -5 M. The results of the fluorescence lifetime are as Figure 6 shown. It can be seen from Figure 6 that the fluorescence lifetime of cellulose-based fluorescent compound 1 is 7.31 nS, 1 + Fe3+ The fluorescence lifetime is 3.88 nS, indicating that Fe 3+ After reacting with the cellulose-based fluorescent compound 1, the fluorescence lifetime decreases.

[0068] Example 7

[0069] Using absolute ethanol as the solvent, a solution of 1 mg / mL cellulose-based fluorescent compound 1 was prepared. Its color was purplish red. When a drop of 1 M NaOH solution was added, the purple color disappeared, and it could emit strong green fluorescence under a 365 nm ultraviolet lamp. The results are as Figure 7 、 Figure 8 shown. This shows that NaOH can enhance the fluorescence intensity of the cellulose-based fluorescent compound 1.

[0070] Example 8

[0071] The bamboo fiber paper was soaked in an ethanol solution of 1 mg / mL cellulose-based fluorescent compound 1 for 5 min, then taken out and dried to obtain a test paper. The test paper was white under natural light. Then it was cut and divided into two categories, named test paper a and test paper b respectively.

[0072] One drop of 0.1 M NaOH solution was added to one piece of test paper a, and no solution was added to the other piece of test paper a. The test paper with the added NaOH solution could show obvious green fluorescence under a 365 nm ultraviolet lamp, while the one without the added NaOH solution had no green fluorescence. The results are as Figure 9 shown, and this method can be used for the qualitative analysis of alkaline solutions.

[0073] The test paper b was used for the detection of ferric ions. One drop of 5*10 -5 M Fe 3+ solution was added to one piece of test paper b, and no solution was added to the other piece of test paper b. The test paper with the added Fe 3+ solution emitted faint green fluorescence under a 365 nm ultraviolet lamp, while the one without the added Fe 3+ solution had no faint green fluorescence.

[0074] Example 9

[0075] Using an ethanol solution of 1 mg / mL cellulose-based fluorescent compound 1, the words "Inspection Passed" were written on the bamboo fiber paper, and then it was naturally dried. The test paper was entirely white under natural light. As Figure 10 shown, under a 254 nm ultraviolet lamp, the words "Inspection Passed" emitted purple fluorescence, while the rest did not. It was used for anti-counterfeiting labels.

Claims

1. A cellulose-based fluorescent compound, characterized in that: Its structural formula is: Wherein, R is H or Et.

2. The cellulose-based fluorescent compound according to claim 1, characterized in that: NaOH is used to enhance the fluorescence intensity of the cellulose-based fluorescent compound.

3. A method for preparing the cellulose-based fluorescent compound according to claim 1, wherein the cellulose is bamboo shoot cellulose or ethyl cellulose, characterized in that: Its synthesis route is:

4. The preparation method according to claim 3, characterized in that: It includes the following steps: 1) Mix bamboo shoot cellulose or ethyl cellulose, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]-2-naphthoic acid, 4-dimethylaminopyridine, and N,N-dimethylformamide evenly to obtain a reaction solution; 2) Drop the N,N'-dicyclohexylcarbodiimide solution dissolved in N,N-dimethylformamide into the reaction solution obtained in step 1), react at room temperature for 24 - 50 h, add distilled water, precipitate solids, and then wash and dry to obtain the cellulose-based fluorescent compound.

5. The preparation method according to claim 4, characterized in that: In step 1), the mass ratio of bamboo shoot cellulose or ethyl cellulose to 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]-2-naphthoic acid is 1:(0.12 - 0.50), the mass ratio of ethyl cellulose to 4-dimethylaminopyridine is 1:(0.03 - 0.05), and the mass-volume ratio of ethyl cellulose to N,N-dimethylformamide is 1 g:(28 - 32) mL.

6. The preparation method according to claim 4 or 5, characterized in that: The mass ratio of bamboo shoot cellulose or ethyl cellulose to N,N'-dicyclohexylcarbodiimide is 1:(0.20 - 0.28); in step 2), the mass-volume ratio of N,N'-dicyclohexylcarbodiimide to N,N-dimethylformamide is (0.20 - 0.28) g:(18 - 22) mL.

7. A use of the cellulose-based fluorescent compound according to claim 1 or 2, characterized in that: It is used for the rapid fluorescence detection of ferric ions; and / or for the detection of alkalinity, and / or for the preparation of anti-counterfeiting labels.

8. The use according to claim 7, characterized in that: The detection method for rapid fluorescence detection of ferric ions is as follows: The sample to be detected is dried and ashed into white in a high-temperature furnace at 550-600 °C. After cooling, concentrated nitric acid and perchloric acid with a volume ratio of 10:1 are added. First, it is digested at a low temperature of 60-120 °C, and then heated to 600 °C until the smoke is exhausted. After cooling, it is dissolved with hydrochloric acid, filtered, and a solution of cellulose-based fluorescent compound 1 is added to the filtrate to obtain a test solution. The concentration of cellulose-based fluorescent compound 1 in the test solution is 0.05 mg / mL. The content of Fe 3+ in the test solution is determined by fluorescence spectrometry; among them, the concentration of concentrated nitric acid is 1.40-1.44 g / mL, and the concentration of perchloric acid is 1.64-1.68 g / mL; When used for the detection of alkalinity, drop the object to be detected into the ethanol solution of the cellulose-based fluorescent compound. If the solution color changes from purplish red to lighter or the purple color disappears, and / or the solution can emit strong green fluorescence under a 365 nm ultraviolet lamp, then the object to be detected is alkaline; When used for the preparation of anti-counterfeiting labels, soak the fiber paper with the solution of cellulose-based fluorescent compound 1 or print or write on the fiber paper with the solution of cellulose-based fluorescent compound 1, and then dry naturally. The soaked part, printed or written part emits purple fluorescence under a 254 nm ultraviolet lamp.

9. The use according to claim 7 or 8, characterized in that: At an excitation wavelength of 350 nm, as the concentration of Fe 3+ gradually increases, the fluorescence intensity of the fluorescence spectrum gradually increases; at an emission wavelength of 421 nm, the linear relationship between the fluorescence intensity and the concentration of Fe 3+ is: y = 75.194x + 193.77, and at an emission wavelength of 483.5 nm, the linear relationship between the fluorescence intensity and the concentration of Fe 3+ is: y = 27.158x + 53.329, where x is the concentration of Fe 3+ and y is the fluorescence intensity.

10. A bamboo shoot cellulose fluorescence detection test strip, characterized in that: Soak the bamboo fiber paper in the ethanol solution of the cellulose-based fluorescent compound described in claim 1 or 2 at 0.8 - 1.2 mg / mL for 3 - 8 min, then take it out and dry naturally to obtain the bamboo shoot cellulose fluorescence detection test paper; The bamboo shoot cellulose fluorescence detection test paper is used for the rapid detection of ferric ions, and / or for the detection of alkalinity, and / or for the production of anti-counterfeiting label paper; When used for the detection of ferric ions, drop the solution of the object to be detected onto the test paper. Under a 365 nm ultraviolet lamp, if the bamboo shoot cellulose fluorescence detection test paper emits light green fluorescence, then the solution of the object to be detected contains ferric ions; When used for the detection of alkalinity, drop the solution of the object to be detected onto the alkalinity detection test paper. If obvious green fluorescence can be seen under a 365 nm ultraviolet lamp, then the object to be detected is alkaline; When used for anti-counterfeiting label paper, it emits purple fluorescence under a 254 nm ultraviolet lamp.

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