Coumarinocoumarin-based fluorescent probe for the sensitive and selective detection of hydrazine in living cells and zebra fish

Coumarinocoumarin-based fluorescent probe for the sensitive and selective detection of hydrazine in living cells and zebra fish

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Qian Fang^a, Lei Yang^**^,^a^,^b, Haiqing Xiong^a, Shaohui Han^a, Yun Zhang^a, Jingpei Wang^a, Wenqiang Chen^**^,^c, Xiangzhi Song^**^,^a^,^d

Chinese Chemical Letters | 2020, 31(1) : 129 - 132

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Chinese Chemical Letters | 2020, 31(1): 129-132

• Communication •

Coumarinocoumarin-based fluorescent probe for the sensitive and selective detection of hydrazine in living cells and zebra fish

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Qian Fang^a, Lei Yang^**^,^a^,^b, Haiqing Xiong^a, Shaohui Han^a, Yun Zhang^a, Jingpei Wang^a, Wenqiang Chen^**^,^c, Xiangzhi Song^**^,^a^,^d

Affiliations

^a College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, China

^b Shandong Province Key Laboratory of Detection Technology for Tumor Makers, School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, China

^c College of Chemistry and Materials Science, Nanning Normal University, Nanning 530001, China

^d Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Changsha 410083, China

Published: 2020-01-15 doi: 10.1016/j.cclet.2019.04.021

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Abstract

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A coumarinocoumarin-based fluorescent probe, JCCA, was developed for the detection of N₂H₄. JCCA exhibited a fast turn-on fluorescence enhancement in response to N₂H₄ with good selectivity, sensitivity and a detection limit of 7.4 nmol/L. Significantly, JCCA displayed a good capability for visualizing N₂H₄ in living cells and zebra fish.

Key words

Fluorescent probe / Hydrazine / Selectivity / Instantaneous / Organism

Cite this Article

Qian Fang, Lei Yang, Haiqing Xiong, Shaohui Han, Yun Zhang, Jingpei Wang, Wenqiang Chen, Xiangzhi Song. Coumarinocoumarin-based fluorescent probe for the sensitive and selective detection of hydrazine in living cells and zebra fish[J]. Chinese Chemical Letters, 2020 , 31 (1) : 129 -132 . DOI: 10.1016/j.cclet.2019.04.021

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Hydrazine (N₂H₄), a potentially versatile inorganic diamine with an ammonia-like smell, is widely used in many fields, including polymerization inhibitors, blowing agents, agricultural chemicals, rocket propellants, and anti-corrosion agents in water treatment [1-4]. Despite of its wide range of applications, N₂H₄ is highly toxic and dangerously unstable. Exogenous N₂H₄ can be readily absorbed and accumulated into human body through oral, dermal or breathing contact routes. In-depth studies on laboratory animals have revealed that endogenous N₂H₄is mutagenic and carcinogenic, which can cause critical damages to kidneys, lungs, liver, and central nervous system [5-9]. As a result, the World Health Organization and US Environmental Protect Agency have set a recommended threshold limit value (TLV) of N₂H₄ to be as low as 10 ppb (0.32 μmol/L) [4, 10]. Therefore, it is urgent and necessary to explore efficient analytical methods for sensitive and selective detection of hydrazine.

Conventional techniques for N₂H₄ detection such as flow detection [11], titrimetry[12], chromatography [13], potentiometry [14], electrochemical methods [15], chromatography-mass spectrometer [16], are usually subjected to expensive instrument, time-consuming, complicated sample preparation or relatively less sensitivity [17, 18]. Fluorescent probes were proved to be useful tools for qualitative and quantitative detection of various species both in vitro and in vivo with the advantages such as high sensitivity, good selectivity, non-invasion, easy operation and real-time imaging [19-23]. Currently, various fluorescent probes for the detection of N₂H₄ have been reported; however, most of them suffer from slow response time and insufficient sensitivity (Table S1 in Supporting information) [24-35]. Moreover, the concentration of N₂H₄ in vivo is low and rapidly fluctuates during the production and catabolism [36]. Therefore, a robust fluorescent probe with a quick response and a low detection limit is needed for the real-time detection of N₂H₄ in vivo.

Coumarinocoumarin dyes are highly fluorescent and have a long-wavelength emission [37], which makes them a robust scaffold for the design of fluorescent probes. Herein, by incorporation of an acetate group to hydroxy julolidine-coumarinocoumarin (JCC), we have developed a novel fluorescent probe, JCCA, for the selective and sensitive detection of N₂H₄ (Scheme 1). We anticipated probe JCCA would be weakly fluorescent due to the photoinduced electron transfer effect from acetate group. Upon the treatment with N₂H₄, the ester bond in probe JCCA would be selectively cleaved to release a highly emissive dye JCC. The synthetic route of probe JCCA was shown in Scheme 1.

Before conducting fluorescence experiments, the solubility of probe JCCA in water (containing 5% DMSO) was measured to be 39.6 mg/L. The optical properties of probe JCCA in the absence/presence of N₂H₄ was investigated in PBS buffer (10.0 mmol/L, pH 7.4, containing 30% acetonitrile). Probe JCCA (10.0 μmol/L) exhibited an absorption maximum at 492 nm. Upon the treatment with excessive N₂H₄, the absorption at 492 nm disappeared and a new absorption peak at 473 nm emerged with a color change from pink to yellow (Fig. S1 in Supporting information). As expected, probe JCCA exhibited very weak fluorescence with λ_max^em = 582 nm (Fig. 1). After the addition of N₂H₄, the solution of probe JCCA produced a strong yellow fluorescence with λ_max^em = 542 nm. The intensities of the fluorescence signals at 542 nm gradually boosted up with increasing the concentration of N₂H₄ ranging from 0.0 μmol/L to 300.0 μmol/L. The maximal fluorescence enhancement was up to 21-fold. There was a good linearity (R = 0.996) between fluorescence intensity at 542 nm and the concentration of N₂H₄ in the range of 0.0–225.0 μmol/L (Fig. S2 in Supporting information). The detection limit was calculated to be 7.4 nmol/L (signal/noise = 3). Therefore, probe JCCA could be applied to qualitatively and quantitatively analyze N₂H₄ with excellent sensitivity. Dye JCC displayed an intensive absorption with an λ_max^abs at 474 nm and was strongly fluorescent with an λ_max^em at 542 nm. The similarity between the optical properties of dye JCC and the reaction mixture of probe JCCA with N₂H₄ evidently suggested that the addition of N₂H₄ to the solution of probe JCCA resulted in the formation of dye JCC (Scheme 2).

Time-dependent fluorescence experiments were carried out by treatment of the solution of probe JCCA (10.0 μmol/L) with N₂H₄ (30 equiv.) in PBS buffer (10.0 mmol/L, pH 7.4, containing 30% acetonitrile). As seen in Fig. 2, the addition of N₂H₄ instantaneously induced strong fluorescent signals, which were maximized within 3 min. In contrast, little fluorescence change was observed when the solution of probe JCCA was in the absence of N₂H₄ during the same interval. These results suggested probe JCCA was stable and exhibited a quick response toward to N₂H₄.

To evaluate the selectivity of probe JCCA for N₂H₄, the fluorescence responses of probe JCCA towards common relevant species (30.0 equiv.) were determined, including biothiols (Cys, Hcy, GSH), cations (Na⁺, K⁺, Mg²⁺, Al³⁺, Zn²⁺, Cu²⁺, Ca²⁺, Hg²⁺, Fe²⁺), anions (N₃^-, F^-, Cl^-, I^-, Br^-, CO₃²^-, PO₄²^-, SO₄²^-, S²^-, SCN^-, NO₃^-, AcO^-) and nitrogen-containing compounds (aniline, thiourea, urea, NH₂OH). As shown in Fig. 3, the fluorescence spectra of probe JCCA exhibited negligible changes in the presence of these relevant analytes. Meanwhile, the co-existence of these relevant species caused no interference on the performance of probe JCCA for the detection of N₂H₄ (Fig. S3 in Supporting information). All the above results clearly showed that probe JCCA had a good selectivity toward N₂H₄.

In order to evaluate whether probe JCCA can function well in biological samples, we investigated its fluorescence property in the absence/present of N₂H₄ in the media with different pH values (Fig. S4 in Supporting information). In the absence of N₂H₄, the fluorescence intensity hardly changed in a pH range between 2.0-10.0. In the presence of N₂H₄ (30.0 equiv.), the solution of probe JCCA displayed strong fluorescent signals with a maximum at 542 nm in a pH range of 7.0-10.0. Therefore, it could be concluded that probe JCCA had a good performance in the detection of N₂H₄ under physiological condition.

Finally, the potential application of probe JCCA in living cells was carried out (Fig. 4). First, the cytotoxicity of probe JCCA was evaluated using HeLa cells by the methyl thiazolyl tetrazolium (MTT) assay. A 96% cell viability was obtained when cells were incubated with 10.0 μmol/L of probe JCCA for 24 h, indicating probe JCCA was non-toxic (Fig. S5 in Supporting information). When HeLa cells were incubated with probe JCCA (10.0 μmol/L) for 30 min, very weak orange fluorescence (bandpass filter 560–600 nm) was observed (Fig. 4d). When HeLa cells were incubated with probe JCCA (10.0 μmol/L) for 30 min and then treated with N₂H₄(300.0 μmol/L) for another 30 min, bright yellow fluorescent signals (bandpass filter 520–560 nm) occurred from cells (Fig. 4a).

Furthermore, we used three-day old zebra fish to investigate the capability of probe JCCA to detect N₂H₄ in living organisms (Fig. 5). When zebra fish was incubated with probe JCCA (10.0 μmol/L) for 30 min at 28 ℃, and then treated with N₂H₄(300.0 μmol/L) for another 30 min, strong yellow fluorescent signals (bandpass filter 560–600 nm) were seen from zebra fish (Fig. 5a). In contrast, the incubation of zebra fish with probe JCCA (10.0 μmol/L) only resulted in weak orange fluorescence (bandpass filter 560–600 nm) (Fig. 5d).

In conclusion, we developed a new fluorescent probe for the detection of N₂H₄ on the basis of a coumarinocoumarin derivative. This probe displayed a fast response time with high sensitivity, good selectivity, and a low detection limit (7.4 nmol/L). The application of this probe in living cells and organism demonstrated it had a good potential for the detection of N₂H₄ in biological systems.

Acknowledgments

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This work was supported by the National Natural Science Foundation of China (No. U1608222), Special Fund for Agro-scientific Research in the Public Interest of China (No. 201503108), the State Key Laboratory of Fine Chemicals (No. KF1606) and the State Key Laboratory of Chemo/Biosensing and Chemometrics (No. 2016005).

Appendix A. Supplementary data

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Supplementary material related to this article canbefound, in the online version, at doi:https://doi.org/10.1016/j.cclet.2019.04.021.

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Year 2020 volume 31 Issue 1

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Article Info

doi: 10.1016/j.cclet.2019.04.021

Receive Date：2019-03-01
Online Date：2026-01-28
Published：2020-01-15

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Received：2019-03-01
Revised：2019-04-08
Accepted：2019-04-10

Affiliations

^a College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, China

^b Shandong Province Key Laboratory of Detection Technology for Tumor Makers, School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, China

^c College of Chemistry and Materials Science, Nanning Normal University, Nanning 530001, China

^d Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Changsha 410083, China

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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Scheme 1 Synthetic route of probe JCCA. (a) No solvent, 120 ℃ for 2 h, yield 42%. (b) Acetic anhydride, 60 ℃ for 2 h, yield 54%.

Fig. 1 Fluorescence spectra of probe JCCA (10.0 μmol/L) in response to N₂H₄ (0.0–300.0 μmol/L) in PBS buffer (10.0 mmol/L, pH 7.4, containing 30% acetonitrile). Excitation wavelength: 480 nm. Excitation and emission slits (nm): 5.0/5.0. Inset: photos of the solution of probe JCCA in the absence/presence of N₂H₄.

Scheme 2 Proposed sensing mechanism of probe JCCA towards N₂H₄.

Fig. 2 Time-dependent fluorescence experiment of probe JCCA (10.0 μmol/L) in the absence and presence of N₂H₄ (300.0 μmol/L) in PBS buffer (10 mmol/L, pH 7.4, containing 30% acetonitrile).

Fig. 3 Fluorescence spectra of probe JCCA (10.0 μmol/L) upon the addition of N₂H₄ and other analytes (300.0 μmol/L) in PBS buffer (10 mmol/L, pH 7.4, containing 30% acetonitrile).

Fig. 4 Fluorescence (left column), bright field (middle column) and merged (right column) images of HeLa cells. Top row: cells incubated with probe JCCA (10.0 μmol/L) for 30 min and subsequently treated with N₂H₄ (300.0 μmol/L) for another 30 min. Bottom row: cells incubated with probe JCCA (10.0 μmol/L) for 30 min. Yellow channel (520–560 nm, excited at 488 nm); Orange channel (560–600 nm, excited at 488 nm).

Fig. 5 Fluorescence (left column), bright field (middle column) and merged (right column) images of three-day old zebra fish. Top row: zebra fish incubated with probe JCCA (10.0 μmol/L) and then treated with N₂H₄ (300.0 μmol/L). Bottom row: zebra fish incubated with probe JCCA(10.0 μmol/L). Yellow channel (520–560 nm, excited at 488 nm); Orange channel (560–600 nm, excited at 488 nm).

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