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ORIGINAL RESEARCH article

Front. Bioeng. Biotechnol., 11 August 2022
Sec. Bioprocess Engineering
This article is part of the Research Topic Isolation, Modification, and Characterization of the Constituents in Biomass and Their Bio-based Applications, Volume II View all 14 articles

Synthesis, determination, and bio-application in cellular and biomass-bamboo imaging of natural cinnamaldehyde derivatives

Jinlai Yang,,,,Jinlai Yang1,2,3,4,5Rencong Guo,,,Rencong Guo1,2,3,4Huimin Yang,,,Huimin Yang1,2,3,4Liangru Wu,,,,
Liangru Wu1,2,3,4,5*
  • 1China National Bamboo Research Center, Hangzhou, China
  • 2Key Laboratory of Bamboo Forest Ecology and Resource Utilization of National Forestry and Grassland Administration, Hangzhou, China
  • 3Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province, Hangzhou, China
  • 4National Longterm Observation and Research Station for Forest Ecosystem in Hangzhou-Jiaxing-Huzhou Plain, Hangzhou, China
  • 5Bamboo Industry (Jian'ou) Branch, Fujian Provincial Collaborative Innovation Institute, Jian'ou, China

Cinnamon essential oil (CEO) is the main ingredient in the renewable biomass of cinnamon, which contains natural cinnamaldehyde. To valorize the value of cinnamaldehyde, two simple and useful compounds (1 and 2) from CEO were synthesized using a Schiff-base reaction and characterized by infrared spectra (IR), nuclear magnetic resonance (NMR), and high-resolution mass spectrometry (HRMS). Compound 1 was used to confirm the presence of Fe3+ and ClO in solution, as well as compound 2. Using fluorescence enhancement phenomena, it offered practicable linear relationship of 1’s fluorescence intensity and Fe3+ concentrations: (0–8.0 × 10−5 mol/L), y = 36.232x + 45.054, R2 = 0.9947, with a limit of detection (LOD) of 0.323 μM, as well as compound 2. With increasing fluorescence, F404/F426 of 1 and the ClO concentration (0–1.0 × 10−4 mol/L) also had a linear relationship: y = 0.0392x + 0.5545, R2 = 0.9931, LOD = 0.165 μM. However, the fluorescence intensity of 2 (596 nm) was quenched by a reduced concentration of ClO, resulting in a linear. In addition, compounds 1 and 2 were used to image human astrocytoma MG (U-251), brain neuroblastoma (LN-229) cells, and bamboo tissue by adding Fe3+ or ClO, with clear intracellular fluorescence. Thus, the two compounds based on CEO could be used to dye cells and bamboo tissues by fluorescence technology.

Introduction

The main aromatic compound in cinnamon essential oil (CEO) is cinnamaldehyde, with a content of 80%–94.8%, and which can be directly extracted from cinnamon (Liu et al., 2021). This renewable biomass of cinnamaldehyde has many useful functions, such as anti-Leishmania activity (Brustolin et al., 2022), antifungal activity (Niu et al., 2022), antibacterial activity (Wang et al., 2021), antimicrobial activity (Thirapanmethee et al., 2021), and improvement of wood decay resistance (Fang et al., 2021). Furthermore, it is easy to synthesize derivatives with biological activity using cinnamaldehyde, such as cinnamaldehyde-based aspirin derivatives (Lu et al., 2018) and chitosan-cinnamaldehyde cross-linked nanoparticles (Gadkari et al., 2019). The Schiff-base fluorescence compounds derived from natural cinnamaldehyde have already been used to sense ClO and Cu2+, and to image U-251 and Hu-7 cells (Yang et al., 2021a). In order to further add the value of natural cinnamaldehyde in the field of fluorescence, the continued synthesis of useful fluorescent compounds from cinnamaldehyde is highly desirable.

As an important microelement in the human body, ferric ion (Fe3+) is a vital part of ferrithionein and heme, playing a crucial role in the physiological activities of oxygen delivery, transcription regulation, enzyme catalysis, and metabolism (Huang et al., 2019a; Li S. et al., 2020; Lin et al., 2022). In the human body, levels of endogenous Fe3+ that are too high or low can result in heart failure, anemia, and Parkinson’s disease (Wang et al., 2019; Li Y. et al., 2020). In recent years, many novel organic fluorescents used to detect Fe3+ have been reported (Song et al., 2019; Rani and John, 2020; Perumal et al., 2021). A fluorescence sensor (AH2) was developed to sense Fe3+ in aqueous media (Petdum et al., 2021), and a fluorescence chemosensor with a microscale multi-functional metal-organic framework was also used to sense Fe3+, as well as Al3+ and 2-hydroxy-1-naphthaldehyde (Kang et al., 2016). Interestingly, porous tetraphenylethylene-based organic polymer (PTOP) could response Fe3+ (turn-off) with high selectivity and sensitivity (Zheng et al., 2020), and a “turn-on” fluorescence sensor (polymer) based on imidazole-functionalized polydiacetylene has also been used to sense Fe3+ (Shin et al., 2022). Thus, the synthesis of new, simple, and efficient fluorescence compounds for the determination of Fe3+ is of great significance.

As a reactive oxygen species (ROS), hypochlorite anion (ClO) can be obtained by the oxidative reaction of H2O2 and Cl (Dong et al., 2020; Pei et al., 2020; Elmas, 2022; Pei et al., 2022), which is widely used in the field of sterilization agents, bleaching agents, and deodorants (Wang et al., 2015; Huang et al., 2016; Dong et al., 2017; Sitanurak et al., 2018; Mahdizadeh et al., 2020). Nevertheless, there is much evidence that excessive generation of ClO can cause diseases, such as cancer, atherosclerosis, neuron degeneration, cardiovascular disease, lung injuries, and kidney disease (Huang et al., 2016; Zhang et al., 2017; Feng et al., 2018; Song et al., 2018; Ma et al., 2020; Zhang et al., 2020). To date, many good organic fluorescence probes for ClO have been synthesized, including benzothiazole-based fluorescence and colorimetric chemosensors (Suh et al., 2022), phenanthroimidazole-based fluorescence (Yang et al., 2022), and thiophene-cyanostilbene Schiff-base sensor (Guo et al., 2021). Therefore, it is imperative to design simple sensors for monitoring ClO.

We report two simple Schiff-base derivatives (1 and 2) based on cinnamaldehyde, with both compounds 1 and 2 sensitive to the presence of Fe3+ and ClO. The optical properties and application potential in bio-imaging of 1 and 2 are systematically investigated for a further study.

Materials and methods

Materials and instruments

All reagents (without further purification) were purchased from commercial suppliers. All experiments involving all compounds (1 and 2) were conducted in a PBS buffer solution (pH = 7.4, 10 mM, 50% (v/v) C2H5OH). Fluorescence spectra were obtained using a PerkinElmer LS 55 fluorescence spectrophotometer. UV-vis absorption spectra were measured on a UV-2550 spectrophotometer (SHIMADZU). 1H and 13C-NMR spectra were determined using a Bruker FT-NMR spectrometer (600 MHz). Infrared spectra were recorded on an FT-IR infrared spectrometer (Nicolet 380). Fluorescence bio-imaging were finished using confocal laser scanning microscopy.

Synthesis

Synthesis of 2-amino-3-(3-phenyl-allylideneamino)-but-2-enedinitrile (1). Cinnamaldehyde (10 mmol), diaminomaleonitrile (10 mmol), and ethanol (50 ml) were added to a 250 ml dried flask with three necks. The contents were then stirred with refluxing for 3.5 h to offer reactant. Using ethanol to recrystallize, a deep-yellow flaked material was produced (57.5%, yield). FT-IR (KBr) ν (cm−1): 3,447, 3,287, 3,133, 2,231, 2,205, 1,615, 1,602, 1,584, 1,450, 1,372, 1,308, 1,146, 992, 951, 751; 1H NMR (DMSO-d6, 600 MHz): 7.00-7.04 (m, 1H), 7.35-7.38 (t, 4H), 7.40-7.59 (m, 2H), 7.75 (s, 2H), 8.08-8.09 (d, 1H); 13C NMR (DMSO-d6, 150 MHz), δ (ppm): 104.15, 114.18, 114.95, 126.72, 127.66, 128.07, 129.47, 130.21, 135.94, 144.46, 157.54; HRMS (m/z): [M + Na]+ calcd for C13H10N4+Na+, 245.0798; found, 245.0717.

Synthesis of 2-amino-3-[3-(4-dimethylamino-phenyl)-allylideneamino]-but-2-enedinitrile (2). 4-(Dimethylamino) cinnamaldehyde (10 mmol), diaminomaleonitrile (10 mmol), and ethanol (80 ml) were separately added to a 250 ml dried flask (three necks). Then, the contents were stirred with refluxing for 6.5 h to gain reactant. The solution was recrystallized using ethanol, producing a crimson crystal (61.3%, yield). FT-IR (KBr) ν (cm−1): 3,450, 3,296, 3,175, 2,909, 2,224, 2,205, 1,661, 1,650, 1,604, 1,583, 1,550, 1,440, 1,367, 1,226, 1,186, 1,145, 992, 812; 1H NMR (DMSO-d6, 600 MHz): 2.98 (s, 6H), 6.73-6.75 (t, 2H), 7.28-7.31 (d, 1H), 7.43-7.49 (m, 4H), 7.55-7.57 (m, 1H), 8.02-8.04 (d, 1H); 13C NMR (DMSO-d6, 150 MHz), δ (ppm): 104.91, 112.19, 112.44, 122.43, 123.50, 123.74, 125.05, 129.81, 131.11, 145.98, 158.56; HRMS (m/z): [M + H]+ calcd for C15H15N5+H+, 266.1400; found, 266.1392.

Cellular imaging

Compounds 1 and 2 were used to image human astrocytoma MG cells (U-251 cells) and human brain neuroblastoma cells (LN-229 cells) using the method of Yang J. et al., 2020.

Bamboo imaging

The leafless part of fresh bamboo poles with leaves was immersed in a solution (1 or 2: 1 × 10−3 mol/L) for 1.5 h. After that, it was cut into slices to observe their microstructure with or without adding a drop of Fe3+ (or ClO) solution (1 × 10−3 mol/L) using an LSM710 confocal fluorescent microscope.

Results and discussion

Synthesis

The two derivatives, 1 and 2, were synthesized using cinnamaldehyde (Scheme 1) (Robertson and Vaughan, 1958) and characterized using IR, NMR, and HRMS. Compounds 1 and 2 were confirmed to be 2-amino-3-(3-phenyl-allylideneamino)-but-2-enedinitrile and 2-amino-3-[3-(4-dimethylamino-phenyl)-allylideneamino]-but-2-enedinitrile.

SCHEME 1
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SCHEME 1. Synthesis of cinnamaldehyde Schiff-base derivatives.

Fluorescence spectral response

To examine the response of 1 and 2 to the cations Fe3+, Ca2+, Cd2+, Co2+, Cr3+, Fe2+, K+, Mn2+, Na+, Hg2+, Pb2+, Cu2+, Zn2+, Mg2+, Al3+, B3+, Li+, and Ni2+, and to the anions Ac, Br, Cl, F, H2PO4, HSO4, OH, I, ROS of ClO, H2O2, NO, ONOO, •O2, and ROO•, the fluorescence selectivity of compounds 1 and 2 in PBS buffer solution (pH = 7.4, 10 mM, 50% (v/v) C2H5OH) was studied using fluorescence spectra (concentrations: 1 × 10−5 mol/L) (Figure 1).

FIGURE 1
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FIGURE 1. Fluorescence spectra of compound 1 (A) and compound 2 (B) with equal positive ions or anions or ROS in a PBS buffer solution: 1: λex = 375 nm, Em. Slit = 5.0 nm, Ex. Slit = 7.0 nm; 2: λex = 430 nm, Em. Slit = 5.0 nm, Ex. Slit = 11.0 nm.

Figure 1A shows peak fluorescence intensities (400–450 nm, compound 1) with adding equal Fe3+ or ClO had a significant enhance, after adding other substance in compound 1’s system, the intensity changed little except •O2 (weak fluorescence enhancement). Therefore Fe3+ and ClO could response with compound 1, with a fluorescence enhancement in solution. In contrast with compound 1’s chemical structure, that of compound 2 has a p-N(CH3)2 in benzene ring; the remainder of the structure is exactly the same as that of compound 1. Thus, the 32 positive ions, anions, and ROS were separately used in response with compound 2 [Figure 1B]. The addition of Fe3+ or ClO (450–550 nm) also enhanced the fluorescence of compound 2 in the PBS buffer solution. That is, compound 2 also responded to Fe3+ and ClO, which is consistent with the results for compound 1. However, the intensity (550–650 nm) was quenched after adding ClO in 2’s solution. The reason for this might be connected with the functional group of p-N(CH3)2. Finally, both compounds 1 and 2 had the potential to detect Fe3+ and ClO in solution.

The anti-interference performance of compounds 1 and 2 (1 × 10−5 mol/L) to Fe3+ (1 × 10−5 mol/L) in the same PBS buffer solution was also investigated [Figure 2A (compound 1) and Figure 2B (compound 2)]. Figure 2A shows that, compared with those of compound 1, the other fluorescence intensities increase significantly. Compared with the intensity of 1+Fe3+, after adding another substance to the 1+Fe3+ system, only the solution of 1+Fe3++ClO enhanced fluorescence weakly; this might be related to the fluorescence enhancement of ClO for compound 1. The 1 + Fe3+ combination resulted in good interference capacities with other substances. As shown in Figure 2B, compared with the results of Figure 2A, the 2 + Fe3+ also had an anti-interference performance for other ions. In contrast, the addition of ClO in 2+Fe3+ did not enhance the fluorescence, possibly because of the p-N(CH3)2 group in compound 2. Both compounds 1 and 2, therefore, have the potential to be used as fluorescence probes for Fe3+.

FIGURE 2
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FIGURE 2. (A) Fluorescence intensity (424 nm) of compound 1, 1 + Fe3+, and 1 + Fe3+ when adding another ion to the PBS buffer solution: λex = 375 nm, Em. Slit = 5.0 nm, Ex. Slit = 6.0 nm; (B) Fluorescence intensity (487 nm) of compound 2, 2 + Fe3+, and 2 + Fe3+ when adding another ion to the PBS buffer solution: λex = 430 nm, Em. Slit = 5.0 nm, Ex. Slit = 9.0 nm.

The anti-interference tests of 1+ClO (or 2+ClO) with the oxidizing agents H2O2, NO, •O2, ONOO, and ROO• are detailed in Supplementary Figures S1A–C. The light-emitting systems of 1+ClO and 2+ClO differed in terms of the anti-interference performance of other ROS. The addition of another ROS in the solution of 1+ClO could not significantly change the fluorescence intensity (424 nm), as well as the 2+ClO at 487 nm. However, to add other ROS in the 2+ClO system could quench fluorescence at 596 nm.

Linearity

Linearity is very important for fluorescence probes, so the linear relationships between probe 1 or probe 2 and Fe3+ and ClO concentration were investigated in a PBS buffer solution [pH = 7.4, 10 mM, 50% (v/v) C2H5OH]; the concentration of probe 1 and probe 2 was 1 × 10−5 mol/L, and the results are shown in Figure 3 (compound 1) and Figure 4 (compound 2).

FIGURE 3
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FIGURE 3. Fluorescence spectra of probe 1 in a PBS buffer solution with various concentrations of Fe3+ (A) and ClO (C). (B) Linear relationship between the fluorescence intensity of probe 1 and Fe3+ concentration. (D) Linear relationship between the F404/F426 of probe 1 and ClO concentration (λex = 375 nm): Fe3+: Em. Slit = 5.0 nm, Ex. Slit = 2.5 nm; ClO: Em. Slit = 5.0 nm, Ex. Slit = 5.0 nm.

FIGURE 4
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FIGURE 4. Fluorescence spectra of probe 2 in a PBS buffer solution with various concentrations of Fe3+ (A) and ClO (C). Linear relationship between fluorescence intensity of probe 2 and concentration of Fe3+ (B) and ClO (D)ex = 430 nm): Fe3+: Em. Slit = 5.0 nm, Ex. Slit = 5.0 nm; ClO: Em. Slit = 5.0 nm, Ex. Slit = 18.0 nm.

Figure 3 shows compound 1’s fluorescence spectra for different concentrations of Fe3+ and ClO. Figure 3A shows that the fluorescence intensity (400–450 nm) gradually increases with increasing Fe3+ concentration. The peak fluorescence intensity of probe 1 vs. Fe3+ concentration is shown in Supplementary Figure S2A. The linear relationship between 1’s peak intensity and the Fe3+ concentration is shown in Figure 3B: y = 36.232x+45.054, R2 = 0.9947 (Fe3+: 0–8.0 × 10−5 mol/L). Using the IUPAC definition of the limit of detection (LOD), an LOD of 0.323 μM was calculated using Eq. 3 σbi/m, which was lower than the 9 μM of a PDA-Im sensor (Shin et al., 2022). Fluorescence enhancement might be ascribed to a complexation of 1’s N atom with Fe3+ (Zhou et al., 2017). With the same trend of fluorescence enhancement (1 + Fe3+), the fluorescence intensity was enhanced with increasing ClO concentration (Figure 3C; Supplementary Figure S2B), with a linear relationship between F404/F426 and ClO concentration (Figure 3D). It also showed a good result: y = 0.0392x+0.5545, R2 = 0.9931 (ClO: 0–1.0 × 10−4 mol/L), with an LOD of 0.165 μM. This LOD value is lower than the 0.238 μM of a coumarin-based fluorescence chemosensor (Elmas, 2022). The reason for 1 monitoring ClO might be connected with the C=N unit, which reacts with ClO (Yang Q. et al., 2020).

With a fluorescence enhancement result, compound 2 can be used to sense Fe3+. The fluorescence spectra of the 2 + Fe3+ solutions are shown in Figure 4A. With the addition of Fe3+ from 0 mol/L to 2.8 × 10−4 mol/L, the peak fluorescence intensity continuously added (Supplementary Figure S3A). That is, probe 2 might have the same function as probe 1 when helping to determine Fe3+ concentration. At the same time, two good linear relationships were obtained, as shown in Figure 4B: 487 nm: y = 47.72x+107.27, R2 = 0.9947, LOD = 0.373μM; 529 nm: y = 19.813x+62.209, R2 = 0.9906, LOD = 0.451 μM.

Figure 4C shows that the peak intensity at 550–650 nm decreases gradually when ClO concentration increases from 0 to 6.0 × 10−5 mol/L. At higher ClO concentration, the intensity almost remains constant (Supplementary Figure S3B). The results of adding ClO to probe 2’s solution were different from those of adding it to probe 1’s solution. It might be affected by the p-N(CH3)2 group in probe 2. Finally, the linear relationship was determined, as shown in Figure 4D. With the concentration range of 0–4.0 × 10−5 mol/L (ClO), the peak intensity of 2’s light-emitting system had a good linear relationship with ClO concentration: y = -141.47x+746.66, R2 = 0.9954, LOD = 0.434 μM.

UV-vis absorption spectra

To further verify the reaction of 1 (or 2) and Fe3+ or ClO in PBS buffer solution (pH = 7.4, 10 mM, 50% (v/v) C2H5OH), UV-vis absorption spectra were recorded. The concentration was 5.0 × 10−5 mol/L, as shown in Figure 5. Figure 5A shows a maximum absorption peak (compound 1) at 376 nm, with A = 1.958. After adding equal amounts of Fe3+ ions, the value of A increased to 2.119. Meanwhile, the A value of 1+ClO decreased to A = 1.649. This reveals that a chemical reaction had taken place among compound 1 and Fe3+ or ClO in the solution, agreeing with the results shown Figure 1A. In compared with compound 1, as shown in Figure 5B, the maximum absorption peak of compound 2 red-shifts from 376 to 428 nm, with a decrease in A of 1.126. It might be affected by the p-N(CH3)2 group of 2. The addition of Fe3+ (or ClO) also changed the peak of probe 2, which had the same trend as probe 1. The peak of 2 + Fe3+ had a weak blue-shift (428–425 nm), and A decreased slightly (1.126–1.098). The reason might also be related to the p-N(CH3)2 group. The results showed that Fe3+ and ClO could response with compounds 1 and 2, which led to a change in fluorescence intensity in the solution.

FIGURE 5
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FIGURE 5. UV-vis absorption spectra of 1, 1 + Fe3+, 1+ClO (A) and 2, 2 + Fe3+, 2+ClO (B) in PBS buffer solution.

Bio-imaging in live cells

To achieve the value of bio-imaging in live cells (Huang et al., 2019b), probes 1 and 2 (1.0 × 10−4 mol/L) were used to dye live U-251 and LN-229 cells (Fe3+ or ClO: 1.0 × 10−3 mol/L). After dying, confocal fluorescent microscopic images of the cells were taken (ZEISS LSM510) (Figure 6; Supplementary Figure S4).

FIGURE 6
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FIGURE 6. Fluorescence bio-images of the U-251 cells of probe 1, 1 + Fe3+, and 1+ClO and probe 2, 2 + Fe3+, and 2+ClO.

Figure 6 shows that there is almost no fluorescence for cells dyed only with probe 1 (U-251 cells). However, the U-251 cells produced clear blue fluorescence after adding a drop of Fe3+ solution to response with compound 1. In addition, the 1+ClO system had the same function as the 1 + Fe3+ system in dying U-251 cells. Therefore, the fluorescence enhancement probe 1 for Fe3+ or ClO could be used in bio-imaging of live U-251 cells. Figure 6 also shows the results for the fluorescence imaging of U-251 cells using compound 2 with the same condition as compound 1. Probe 2 could sense Fe3+ or ClO in U-251 cells. In order to find the results of imaging in other cells, LN-229 cells were chosen to conduct an experiment—the results are provided in Supplementary Figure S4. Probe 2 led to exactly the same result as probe 1, in keeping with what is shown in Figure 6. The 1 + Fe3+ and 2 + Fe3+ permeated the LN-229 cells well and provided bright intracellular fluorescence, as well as the 1+ClO and 2+ClO. The addition of ClO quenched the intensity of 2’s fluorescence (550–650 nm) (Figure 4C); however, the 2+ClO could also be used to image cells, which might have been connected with the fluorescence at 450–550 nm. Consequently, probes 1 and 2 for Fe3+ and ClO could be used in the bio-imaging of U-251 and LN-229 cells.

Bio-imaging in bamboo

Various fluorescence probes can be used to dye plants when required, and bamboo is an important renewable and abundant biomass which can provide wood and shoots (Yang et al., 2021b; Lin et al., 2021; Zheng et al., 2021). In order to investigate the microstructure of bamboo, probes 1 and 2 were used in conjunction with fresh bamboo poles with leaves, the imaging results for 1, 1 + Fe3+, and 1+ClO and 2, 2 + Fe3+, and 2+ClO are in Figure 7.

FIGURE 7
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FIGURE 7. Fluorescence images of bamboo structure using compound 1, 1 + Fe3+, and 1+ClO and compound 2, 2 + Fe3+, and 2+ClO.

It had very weak fluorescence when the bamboo was dyed with 1 or 2. After adding a drop of the same concentration of Fe3+ solution in the bamboo with 1 or 2, significant blue fluorescence occurred, and the microstructure of the biological tissues was clearly observed. It also told that these fluorescence tissues transferred 1 or 2. Furthermore, the images of 1+ClO and 2+ClO were worse than those of 1 + Fe3+ and 2 + Fe3+, in keeping with Figure 1. Finally, the 1 + Fe3+ and 1+ClO and 2 + Fe3+ and 2+ClO could not only dye cells, but could also image the bamboo microstructure.

Conclusion

Two simple and practical derivatives (1 and 2) were synthesized using a chemical reaction of Schiff-base originating from natural cinnamaldehyde and developed for monitoring Fe3+ or ClO. Compound 1 could sense Fe3+ or ClO selectively, leading to fluorescence enhancement in a PBS solution, and providing the linear relationship between the fluorescence intensity and the ion concentration. Meanwhile, in compared with compound 1, probe 2 could also detect Fe3+ with increased fluorescence intensity in solution. Nevertheless, the addition of ClO quenched the fluorescence of 2 at 596 nm. As a result, probe 2 for Fe3+ or ClO also had a favorable linear relation. Finally, compounds 1 and 2 were used in a fluorescence imaging experiment with U-251 cells, LN-229 cells, and bamboo tissues, offering clear intracellular fluorescence with good results. Thus, these two Schiff-base derivatives based on cinnamaldehyde could be used in future fluorescence detection and bio-imaging, adding to the scientific value of the natural biomass of cinnamaldehyde.

Data availability statement

The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.

Author contributions

JY, RG, and HY did the experiments and analyzed experimental data. JY and LW designed the research. JY wrote the manuscript. All authors contributed to the article and approved the submitted version.

Funding

The authors gratefully acknowledge the projects supported by the Talent Development Program of China National Bamboo Research Center (ZXYC202204), the Public Welfare Technology Application Research Project of Zhejiang Province (LGN22C160009), the Key Research and Development Program of Zhejiang Province (2020C02036), the Science and Technology Planned Project of Wenzhou (N20180005), and Guizhou Speciality Forestry Industry Research and Development Project (2020-28).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fbioe.2022.963128/full#supplementary-material

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Keywords: natural cinnamaldehyde, cinnamaldehyde derivatives, synthesis, determination, bio-application

Citation: Yang J, Guo R, Yang H and Wu L (2022) Synthesis, determination, and bio-application in cellular and biomass-bamboo imaging of natural cinnamaldehyde derivatives. Front. Bioeng. Biotechnol. 10:963128. doi: 10.3389/fbioe.2022.963128

Received: 07 June 2022; Accepted: 11 July 2022;
Published: 11 August 2022.

Edited by:

Lei Wang, Ocean University of China, China

Reviewed by:

Qi Lian, Hebei Normal University of Science and Technology, China
Xiao Jiang, North Carolina State University, United States
Thilina U. Jayawardena, University of Calgary, Canada

Copyright © 2022 Yang, Guo, Yang and Wu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Liangru Wu, YmFtc2hvb3RzQDE2My5jb20=

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