WO2011137574A1 - 汞离子检测用氟硼染料荧光探针 - Google Patents
汞离子检测用氟硼染料荧光探针 Download PDFInfo
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- WO2011137574A1 WO2011137574A1 PCT/CN2010/001973 CN2010001973W WO2011137574A1 WO 2011137574 A1 WO2011137574 A1 WO 2011137574A1 CN 2010001973 W CN2010001973 W CN 2010001973W WO 2011137574 A1 WO2011137574 A1 WO 2011137574A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/022—Boron compounds without C-boron linkages
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/10—Metal complexes of organic compounds not being dyes in uncomplexed form
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
- C09K11/06—Luminescent materials, e.g. electroluminescent or chemiluminescent containing organic luminescent materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1044—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms
- C09K2211/1055—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms with other heteroatoms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/7769—Measurement method of reaction-produced change in sensor
- G01N2021/7786—Fluorescence
Definitions
- the invention relates to a fluorescent boron dye fluorescent probe for detecting mercury ions, which belongs to the fluorescent molecular probe suitable for detecting mercury ions in natural water samples and biological cells in the field of fine chemicals.
- fluorescent molecular probe detection technology with high sensitivity, high selectivity, simple and rapid development has developed rapidly, and its application in elemental analysis has become more and more extensive.
- fluorescent molecular probes capable of detecting mercury ions such as rhodamine-based fluorescent molecular probes (Chen XQ, Nam SW, Jou MJ, et al., Org. Lett, 2008, 10, 5235-5238.)
- fluorescence A probe that is a fluorescent precursor and a crown ether is a recognition group (Yoon S, Albers AE, Wong AP, et al., J. Am. Chem.
- the invention improves the structure and performance deficiencies of the existing complex-type mercury ion fluorescent probes, designs and synthesizes the low-concentration mercury ion detection and the detection of the living cells in the natural water sample, and has the advantages of simple structure and excellent performance.
- the probe molecule of the fluoroboron fluorescent dye is for the purpose.
- a fluoroboron dye fluorescent probe molecule for mercury ion detection has the following structural formula BH g:
- the probe molecule was formulated into a composition for mercury ion detection using an ethanol-HEPES buffer solution.
- the method for synthesizing a fluoroboron dye fluorescent probe molecule for mercury ion detection comprises the following steps: 1) reacting 2,4-dimethylpyrrole with 3-hydroxy-4nitro-benzaldehyde: 2, 4- Dimethylpyrrole and 3-hydroxy-4-nitro-benzaldehyde were dissolved in dichloromethane, and a drop of trifluoroacetic acid was added dropwise, followed by stirring at room temperature for 5 hours; the solvent was evaporated under reduced pressure, and dichlorodicylidene was added and stirred. After 15 minutes, a solution of triethylamine and boron trifluoride diethyl ether was added, and stirring was continued for 45 minutes. The reaction solution was washed with water and extracted with dichloromethane, and dichloromethane was evaporated under reduced pressure. Obtained intermediate I:
- Fluorescent dyes obtained by the above technical solutions can be recovered by separation and purification techniques well known in the art to achieve the desired purity.
- the various starting materials used are either commercially available or can be readily prepared from materials well known in the art by methods well known to those skilled in the art or as disclosed in the prior art.
- the present invention provides not only a composition comprising the above compound BH g , which is used for the detection of mercury ions.
- the composition may be present as an ethanol-HEPES buffer solution, or may be present in other suitable forms prepared as a solution with an ethanol-HEPES buffer solution prior to use; and a composition using the above compound BHg or BHg to detect mercury is also provided.
- the method of ion which comprises reacting a compound comprising mercury ions or BH test sample composition in G BH.
- the beneficial effects of the present invention are:
- the above probe molecules have extremely important application value.
- the probe molecule has high detection sensitivity, is insensitive to pH changes, and has excellent anti-interference ability to various metal ions and anions. It can be used not only to detect mercury ions in a sulfur-rich environment, but also to be applied in actual nature.
- the detection of mercury ions in water samples and the detection of the presence of mercury ions in living cells make such probes extremely useful as reagents for determining changes in mercury ion concentration.
- the design of the fluorescent probe molecule is based on the mechanism of the complexation of o-aminophenol with mercury ions.
- the fluorescence emission of the probe molecules before and after complexing with mercury ions is about 20 times higher.
- Fluorescent probe molecules have good selectivity for mercury ions, and metal ions such as sodium, potassium, calcium, magnesium, and copper do not interfere with detection.
- the fluorescent probe molecules are not sensitive to pH changes, and pH changes have little effect on fluorescence emission in the pH range of 5-12.
- Fluorescent probe molecules can detect ppb mercury ion concentration and have a good linear relationship.
- Fluorescent probe molecules can detect mercury ions in a sulfur-rich environment without interference.
- Fluorescent probe molecules can be used to detect mercury ions in actual natural water samples.
- the fluorescent probe has good cell permeability, and has little toxic and side effects on the cells, and can detect mercury ions in living cells.
- Figure 1 is in ethanol-HEPES (N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid) buffer solution (20 mM HEPES, 100 mM NaN0 3 , 1:1, v/v, pH 7.2)
- the fluorescence intensity of the fluorescent molecular probe BHg is plotted as a function of mercury ion concentration.
- the concentration of the fluorescent probe molecule BHg is 10, and the concentration of mercury ions changes from 0 to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 20/ ⁇ 4.
- the abscissa is the wavelength (nm) and the ordinate is the fluorescence intensity.
- the instrument used was a fluorescence spectrophotometer, model: LS55.
- Figure 2 is a diagram showing the selective fluorescence emission of mercury ion by fluorescent molecular probe BHg.
- concentration of the fluorescent probe molecule BHg is 10, and the concentration of each metal ion is a fluorescence emission spectrum at a 5-fold equivalent.
- the abscissa is the wavelength (nm) and the ordinate is the fluorescence intensity.
- the instrument used was a fluorescence spectrophotometer, model: LS55.
- Figure 3 is a fluorescence emission diagram of the fluorescence intensity of the fluorescent probe molecule BHg as a function of pH in an ethanol-HEPES buffer solution (20 mM HEPES, 100 mM NaN0 3 , 1:1, v/v, pH 7.2).
- the abscissa is pH and the ordinate is fluorescence intensity.
- the concentration of the fluorescent probe molecule BHg is 10.
- the pH was adjusted with NaOH (1 M) and HCl (1 M).
- the instrument used was a fluorescence spectrophotometer, model: LS55.
- Figure 4 is an interference experiment of various metal ions on fluorescent probe molecule BHg-mercury ion complex in ethanol-HEPES buffer solution (20 mM HEPES, 100 mM NaN0 3 , 1:1, v/v, pH 7.2). Add mercury ions to the metal ions and probes other than mercury ions. Fluorescent probe molecule The concentration of BHg is 10. The ion concentration on the abscissa is 5 times the concentration of the probe molecule, and the ordinate is the fluorescence intensity. The instrument used was a fluorescence spectrophotometer, model: LS 55.
- Figure 5 is an interference experiment of various anions on the fluorescent probe molecule BHg-mercury ion complex in ethanol-HEPES buffer solution (20 mM HEPES, 100 mM NaN0 3 , 1:1, v/v, pH 7.2). Mercury ions are added after adding various anions and probes.
- the concentration of the fluorescent probe molecule BHg is 10, ⁇ .
- the various ion concentrations on the abscissa are 5 times the concentration of the probe molecule, and the ordinate is the fluorescence intensity.
- the instrument used was a fluorescence spectrophotometer, model: LS 55.
- Figure 6 is a graph showing the relationship between the ppb-level concentration of mercury ions and the fluorescence intensity using the fluorescent probe molecule BH g .
- concentration of the fluorescent probe molecule BH g is 5.
- the abscissa is the mercury ion concentration and the ordinate is the fluorescence intensity.
- the instrument used was a fluorescence spectrophotometer, model: LS 55.
- Figure 7 is a graph showing the relationship between the fluorescence enhancement factor of BH g and the concentration of mercury ions.
- concentration of the fluorescent probe molecule BHg is 10.
- the abscissa is the mercury ion concentration and the ordinate is the fluorescence enhancement factor.
- the instrument used was a fluorescence spectrophotometer, model: LS 55.
- Figure 8 shows the fluorescence changes of BHg after adding 50ppb mercury ions to each of the three water samples.
- the abscissa is a different water source and the ordinate is the fluorescence enhancement factor.
- the instrument used was a fluorescence spectrophotometer, model: LS 55.
- Figure 9 shows the study of BHg for identifying mercury ions in a sulfur-rich environment.
- concentration of the fluorescent probe molecule BHg was 10 ⁇ .
- the abscissa is a different system and the ordinate is the fluorescence intensity.
- the instrument used was a fluorescence spectrophotometer, model: LS 55.
- Figure 10 is an image of the identification of mercury ions in Osteoblasts cells using the fluorescent probe molecule BHg.
- Figure (a) is a bright field image of BHg added to cultured Osteoblasts cells after incubation for 30 minutes at 37 ° C in medium;
- Figure (b) shows BHg added to cultured Osteoblasts at 37 ° C An image after incubation for 30 minutes in the medium;
- (c) An image obtained by adding mercury ions to the probe-containing cell culture solution and incubating at 37 ° C for 30 minutes.
- the fluorescent probe molecule has a BHg concentration of 10 and a mercury ion concentration of 10 ⁇ M.
- the instrument is Olympus 1X70-131.
- BHg to ethanol-HEPES (N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid) buffer solution (20 mM HEPES, 100 mM NaN0 3 , 1:1, v/v, pH 7.2). Formulated into a 10 M concentration solution.
- HEPES N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid
- concentration of mercury ions is gradually increased by 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 20/ ⁇ M
- BHg fluorescence is also gradually enhanced, and titration to saturation fluorescence is approximately 20 times enhanced (Fig. 1).
- the instrument used was a fluorescence spectrophotometer, model: LS55.
- probe BHg was added to a 5-fold excess of various metal ions in ethanol-HEPES (N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid) buffer solution (20 mM HEPES, 100 mM NaN0 3 , 1:1, v/v, pH 7.2), probe excitation wavelength is 49Q nm , probe emission wavelength is 513 nm , and the test results are shown in Fig. 2.
- the probe BHg has a high selectivity for mercury ions, and only the addition of mercury ions can produce significant fluorescence enhancement.
- metal ions such as sodium, potassium, calcium, magnesium, copper, and anions such as chloride ions, nitrate ions, and sulfate ions have little or no interference with the entire recognition process.
- the instrument used was a fluorescence spectrophotometer, model: LS55.
- Example 5 Sensitivity of Probe BHg to Mercury Ion Detection - Compound BHg Add mercury ions at a concentration of 2-12 ppb to ethanol-HEPES buffer solution (20 mM HEPES, 100 mM NaN0 3 , 1:1, v/v, pH 7.2) and record the corresponding changes in fluorescence intensity.
- Figure 6 It can be seen from the figure that the probe BH g has a significant increase in fluorescence intensity in the range of 2-12 ppb and a good linear relationship between fluorescence intensity and mercury ion concentration. Therefore, the probe can be used for the detection of low concentrations of mercury ions.
- the instrument used was a fluorescence spectrophotometer, model: LS55.
- Example 6 Detection of Mercury Ions by Probe BH g in Natural Water Samples
- BH g was added to the three samples to form a 10 M concentration solution, which in turn increased the amount of mercury ions added.
- Fig. 7 As the concentration of mercury ions increases, the fluorescence intensity of the three water samples increases significantly and has a good linear relationship. Especially after adding 50ppb mercury ions, the fluorescence intensity of the three water samples increases respectively. 3.9 times, 4.5 times, 2.9 times (Fig. 8), the effect is obvious, indicating that BH g can be applied to the detection of mercury ions in actual natural water samples.
- BHg was added to the cultured Osteoblasts cells and cultured in the medium at 37 ° C for 30 minutes, at which time the fluorescence of BHg in the living Osteoblasts cells was weak (Fig. 10(b)).
- Mercury ions were added to the above probe-containing cell culture medium and incubated for 30 minutes under yVC conditions, at this time in the living
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Description
汞离子检测用氟硼染料荧光探针
技术领域
本发明涉及一种汞离子检测用氟硼染料荧光探针, 其属于精细化工领域中 适用于自然水样及生物细胞内汞离子检测用荧光分子探针。
背景技术
当体温计、 电池成为每个家庭必备的生活用品时, 汞产品已经深入人们生 活的各个角落, 由于人们的不正确使用汞产品, 或者因汞泄露处理不当而引起 汞污染的事件层出不穷。 其他造成汞污染的途径还有很多, 例如火山爆发、 矿 物燃料的消耗, 尤其是汞矿的开采, 造成了严重的汞污染, 危害生态环境以及 人类健康的问题已经日益严重!
近年来, 拥有高灵敏度、 高选择性、 简洁快速的荧光分子探针检测技术快 速发展, 在元素分析中的应用越来越广泛。 目前能够检测汞离子的荧光分子探 针有很多, 例如罗丹明类荧光分子探针 (Chen X Q, Nam S W, Jou M J, et al., Org. Lett, 2008, 10, 5235-5238.),荧光素为荧光母体、冠醚为识别基团的探针 (Yoon S, Albers A E, Wong A P, et al., J. Am. Chem. Soc. , 2005, 127, 16030-16031.), 基于 荧光共振能量转移机理(FRET)设计的比率型荧光分子探针 (Zhang X L, Xiao Y, Qian X Η, Angew. Chem., Int. Ed" 2008, 47, 8025-8029.)以及离子催化水解型荧光 探针 (Santra M, Ryu D, Chatterjee A, et al., Chem. Commun., 2009, 21 15-21 17)。 由 于汞离子的嗜硫性, 这些探针的识别基团大部分都含有硫元素。 这样虽然提高 了配体与汞离子的络合能力, 但是同时也降低了配体的选择性, 因为含硫基团 也常与铅、 银等元素络合。 其次, 这些探针大部分测试都是在实验室条件下进 行的, 而实际应用在自然环境条件下的案例却很少, 因为自然环境条件复杂, 对探针的水溶性、 选择性、 灵敏度都是极大的挑战。 另外, 生物体内的一些分 子含有巯基, 他们能与汞离子形成稳定的配合物, 但是很少有文献去探讨这些 生物分子对探针识别汞离子时的影响。 因此, 开发一种新型的结构简单易于制 备的、 高选择性与灵敏度的、 并且能够应用在实际的自然环境条件下及生物细
胞内的荧光分子探针仍然是个挑战。
发明内容
本发明改进现有的基于络合型汞离子荧光探针结构和性能上的不足, 设计 并合成出适用于自然水样中低浓度汞离子检测以及活细胞内检测用、 结构简单 性能优良的基于氟硼荧光染料的探针分子为目的。
本发明采用的技术解决方案是: . 一种汞离子检测用氟硼染料荧光探针分子 具有如下结构通式 BHg:
所述的汞离子检测用氟硼染料荧光探针分子的合成方法包括下列步骤: 1) 使 2, 4-二甲基吡咯与 3-羟基 -4硝基-苯甲醛反应: 将 2, 4-二甲基吡咯 和 3-羟基 -4硝基-苯甲醛溶解在二氯甲烷中, 滴一滴三氟乙酸, 然后室温下搅拌 5小时; 减压蒸除溶剂, 加入二氯二氰苯醌, 搅拌 15分钟后再加入三乙胺和三 氟化硼乙醚溶液, 继续搅拌 45分钟, 用水洗涤反应溶液, 并用二氯甲垸萃取; 减压蒸除二氯甲烷, 用柱层析分离提纯目标产物, 得到中间体 I:
2)将中间体 I还原, 得到化合物 BHg: 将中间体 I溶解在乙醇中, 加入水 合肼和钯碳催化剂, 回流反应 2个小时; 冷却后, 将溶液过滤, 滤液减压蒸除 乙醇, 然后用二氯甲垸重新溶解。 用去离子水分两次洗涤有机层; 有机层溶液 用无水硫酸钠干燥, 减压蒸除二氯甲垸, 用柱层析分离提纯目标产物, 得到红 色固体:
上述的技术方案所得荧光染料可通过本领域公知的分离和纯化技术回收, 以达到需要的纯度。 使用的各种原料均可市售获得, 或者可通过本领域技术人 员公知的方法或现有技术中公开的方法由本领域公知的原料简单地制备得到。 本发明不仅提供了包含上述化合物 BHg的组合物, 所述组合物用于汞离子的检 测。 组合物可作为乙醇 -HEPES 缓冲溶液形式存在, 或者可作为临用前用乙醇 -HEPES缓冲溶液配制为溶液的其它合适形式存在;而且还提供了使用上述化合 物 BHg或包含 BHg的组合物以检测汞离子的方法, 该方法包括使上述化合物 BH 或包含 BHg的组合物检测样品中的汞离子。
本发明的有益效果是: 上述的探针分子具有极其重要的应用价值。 特别是 探针分子检测灵敏度高, 对 pH变化不敏感, 对各种金属离子以及阴离子具有很 好的抗干扰能力, 不但可以应用在富硫环境中检测汞离子, 并且还可以应用在 实际的自然水样中检测汞离子以及实现在活细胞内检测汞离子的存在, 使得这 类探针作为测定汞离子浓度变化的试剂是极其有用的。 由以上描述以及本领域 技术人员公知的常识, 可了解 BODIPY类染料分子荧光探针的各种优点, 包括 但不限于以下:
(1)荧光探针分子激发和发射光谱在可见区, 荧光量子产率高, 对溶剂
极性不敏感, 并且化学 /光稳定性好。
(2)荧光探针分子的设计基于邻氨基酚与汞离子络合的机理, 探针分子 络合汞离子前后荧光发射约有 20倍的增长。荧光探针分子对汞离子有很好 的选择性, 钠、 钾、 钙、 镁、 铜等金属离子对检测没有干扰。 另外荧光探 针分子对 pH变化不敏感, 在 pH 5-12的范围内, pH变化对荧光发射基本 无影响。
(3)荧光探针分子可以检测到 ppb级汞离子浓度, 并且有很好的线形关 系。
(4)荧光探针分子可以在富硫环境中检测汞离子而不受干扰。
(5)荧光探针分子可以应用在实际的自然水样中检测汞离子。
(6)荧光探针分子细胞渗透性好, 对细胞本身毒副作用小, 可以实现活 细胞内汞离子的检测。
附图说明
图 1是在乙醇 -HEPES(N-2-羟乙基哌嗪 -N-2-乙磺酸)缓冲溶液(20 mM HEPES, 100 mM NaN03, 1:1, v/v, pH 7.2) 中进行的荧光分子探针 BHg的荧 光强度随汞离子浓度的变化关系图。荧光探针分子 BHg的浓度是 10 汞离子 的浓度变化从小到大依次是 0, 1,2,3,4,5,6, 7, 8, 9, 10, 12, 14,20/^4。 横坐标为 波长 (nm), 纵坐标为荧光强度。 所用仪器为荧光分光光度计, 型号: LS55。
图 2是荧光分子探针 BHg对汞离子的选择性荧光发射图。 荧光探针分子 BHg的浓度是 10 ,各种金属离子的浓度是其 5倍当量时的荧光发射光谱。横 坐标为波长 (nm),纵坐标为荧光强度。所用仪器为荧光分光光度计,型号: LS55。
图 3是乙醇 -HEPES缓冲溶液(20 mM HEPES, 100 mM NaN03, 1:1, v/v, pH 7.2) 中荧光探针分子 BHg的荧光强度随 pH变化的荧光发射图。 横坐标为 pH, 纵坐标为荧光强度。 荧光探针分子 BHg的浓度为 10 。用 NaOH (1 M) 和 HC1(1 M)调节 pH。 所用仪器为荧光分光光度计, 型号: LS55。
图 4是在乙醇 -HEPES缓冲溶液 (20 mM HEPES, 100 mM NaN03, 1:1, v/v, pH 7.2) 中各种金属离子对于荧光探针分子 BHg—汞离子络合物的干扰实 验, 先加入除汞离子外其他金属离子以及探针后再加入汞离子。 荧光探针分子
BHg的浓度为 10 。横坐标各种离子浓度为探针分子浓度的 5倍, 纵坐标为荧 光强度。 所用仪器为荧光分光光度计, 型号: LS 55。
图 5是在乙醇 -HEPES缓冲溶液 (20 mM HEPES, 100 mM NaN03, 1 : 1 , v/v, pH 7.2 ) 中各种阴离子对于荧光探针分子 BHg—汞离子络合物的干扰实验, 先加入各种阴离子以及探针后再加入汞离子。 荧光探针分子 BHg 的浓度为 10 ,Μ .横坐标各种离子浓度为探针分子浓度的 5倍, 纵坐标为荧光强度。所用仪器 为荧光分光光度计, 型号: LS 55。
图 6是用荧光探针分子 BHg研究 ppb级浓度汞离子与荧光强度线形关系 图。 荧光探针分子 BHg的浓度为 5 。横坐标为汞离子浓度, 纵坐标为荧光强 度。 所用仪器为荧光分光光度计, 型号: LS 55。
图 7为 BHg的荧光增强倍数随不同浓度汞离子的变化关系图。荧光探针分 子 BHg的浓度为 10 。横坐标为汞离子浓度, 纵坐标为荧光增强倍数。 所用仪 器为荧光分光光度计, 型号: LS 55。
图 8为三个水样中分别加入 50ppb汞离子后 BHg的荧光变化情况。横坐标 为不同水源,纵坐标为荧光增强倍数。所用仪器为荧光分光光度计,型号: LS 55。
图 9是 BHg在富硫环境中识别汞离子的研究。 荧光探针分子 BHg的浓度 为 10^。横坐标为不同体系, 纵坐标为荧光强度。 所用仪器为荧光分光光度计, 型号: LS 55。
图 10用荧光探针分子 BHg在 Osteoblasts细胞中对汞离子的识别成像图。 图 (a)为 BHg加入培养好的 Osteoblasts细胞中在 37°C下培养基中培养 30分钟后 白的亮场成像图; 图 (b)为 BHg加入培养好的 Osteoblasts细胞中在 37°C下培养 基中培养 30分钟后的图像; 图 (c) 向上述含探针的细胞培养液中加入汞离子后 在 37°C的条件下孵化 30分钟后的图像。 荧光探针分子 BHg的浓度为 10 , 汞 离子浓度为 10μΜ。 仪器为 Olympus 1X70-131。
具体实施方式
实施例 1 探针 BHg的合成:
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实施例 2 探针 BHg的荧光强度随汞离子浓度的变化关系:
将 BHg加入乙醇 -HEPES (N-2-羟乙基哌嗪 -N-2-乙磺酸)缓冲溶液(20 mM HEPES, 100 mM NaN03, 1:1, v/v, pH 7.2) 中, 配成 10 M浓度的溶液。 没加入 汞离子时, BH 荧光很弱,然后依次逐渐增加汞离子的浓度 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 20/^M,BHg荧光也逐渐增强,滴定到饱和荧光大约增强了 20倍(图 1) 。 所用仪器为荧光分光光度计, 型号: LS55。
实施例 3 探针 BHg对汞离子选择性和抗千扰能力:
将 10 的化合物 BHg加到 5倍过量的各种金属离子的乙醇 -HEPES (N-2- 羟乙基哌嗪 -N-2-乙磺酸)缓冲溶液(20 mM HEPES, 100 mM NaN03, 1:1, v/v, pH 7.2) ,探针激发波长为 49Q nm, 探针发射波长 513 nm, 测试结果显示于图 2中。从 图中可以看到, 探针 BHg对汞离子具有很高的选择性, 只有汞离子的加入才能 产生明显的荧光的增强。 另外从图 4、 图 5中可以看出钠、 钾、 钙、 镁、 铜等金 属离子以及氯离子、 硝酸根离子、 硫酸根离子等阴离子对整个识别过程几乎没 有没有干扰。 所用仪器为荧光分光光度计, 型号: LS55。
实施例 4 探针 BHg对 pH的不敏感性:
于化合物 BHg (10 μΜ 的乙醇 -HEPES缓冲溶液 (20 mM HEPES, 100 mM NaN03, 1:1, v/v, pH 7.2) 中滴加 NaOH溶液 (1 M) 或 HC1溶液 (1M) 来调节 溶液的 pH并测定荧光强度,记录相应的荧光强度变化,测试结果显示于图 3中。 从图中可以看出探针 BHg在 pH 5-12的范围内, pH变化对荧光发射基本没有影 响。 因此探针可用于此 pH范围内汞离子的检测。 所用仪器为荧光分光光度计, 型号: LS55。
实施例 5 探针 BHg对汞离子检测的灵敏度- 于化合物 BHg
乙醇 -HEPES缓冲溶液 (20 mM HEPES, 100 mM NaN03, 1:1, v/v, pH7.2)中加入 2-12 ppb浓度的汞离子, 记录相应的荧光强度变 化, 测试及过显示于图 6中。 从图中可以看出探针 BHg, 在 2-12 ppb的范围内 荧光强度有明显增强且荧光强度随汞离子浓度变化呈现很好的线形关系。 因此 探针可用于低浓度汞离子的检测。 所用仪器为荧光分光光度计, 型号: LS55。
实施例 6 探针 BHg在自然水样中对汞离子的检测
我们选取了三处不同的水源: 黄海海水 (大连) 、 池水及自来水。 在三个 样品中分别加入 BHg配成 10 M浓度的溶液, 依次增加汞离子的加入量。从 图 7中可以看出, 随着汞离子浓度的增加, 三个水样的荧光强度均显著增加并 有很好的线性关系, 尤其加入 50ppb汞离子后三个水样的荧光强度分别增加了 3.9倍、 4.5倍、 2.9倍 (图 8 ) , 效果明显, 说明 BHg可以应用在实际的自然水 样中进行汞离子的检测。
实施例 7 探针 BHg在富硫环境中对汞离子的检测
在乙醇 -HEPES缓冲溶液 (20 mM HEPES, 100 mM NaNO3, 1 : 1, v/v, pH 7.2) 中, 依次加入探针 BHg ( 10 ) 、 半胱氨酸 (5(VM ) 、 汞离子 (50 M ) , 记录 荧光强度变化, 并与直接加入汞离子 (50^ ) BHg的荧光强度变化做比较, 根 据图 9所示, 半胱氨酸并没有影响探针识别汞离子的过程, 说明探针 BHg可以 应用在富硫环境中检测汞离子。
实施例 8 探针 BHg系列在活细胞内对汞离子的检测:
将 BHg加入培养好的 Osteoblasts细胞中在 37°C下在培养基中培养 30分钟, 此时的 BHg在活的 Osteoblasts细胞中的荧光很弱 (图 10(b)) 。 向上述含探针 的细胞培养液中加入汞离子后在 yVC的条件下孵化 30分钟, 此时在活的
Osteoblasts细胞中的荧光变得很强(图 10(c)) 。 亮场成像证明含有 BHg以及汞 离子的 Osteoblasts细胞在整个过程中均可以观测到 (图 10(a)) 。 所用仪器是 Olympus, 1X70-131。
Claims
1. 一种汞离子检测用氟硼染料荧光探针, 其特征在于: 所述探针分子具有 如下结构通式 BHg:
2. 据权利要求 1所述的汞离子检测用氟硼染料荧光探针, 其特征在于: 所 述探针分子采用乙醇 -HEPES缓冲溶液配制成用于汞离子检测用的组合物。
3. 据权利要求 1所述的汞离子检测用氟硼染料荧光探针的合成方法, 其特 征在于: 所述探针分子的合成方法包括下列步骤:
1) 使 2, 4-二甲基吡咯与 3-羟基 -4硝基-苯甲醛反应: 将 2, 4-二甲基吡咯 和 3_羟基 _4硝基-苯甲醛溶解在二氯甲垸中, 滴一滴三氟乙酸, 然后室温下搅拌 5小时; 减压蒸除溶剂, 加入二氯二氰苯醌, 搅拌 15分钟后再加入三乙胺和三 氟化硼乙醚溶液, 继续搅拌 45分钟, 用水洗涤反应溶液, 并用二氯甲垸萃取; 减压蒸除二氯甲垸, 用柱层析 物, 得到中间体 I:
2)将中间体 I还原, 得到化合物 BHg: 将中间体 I溶解在乙醇中, 加入水 合肼和钯碳催化剂, 回流反应 2个小时; 冷却后, 将溶液过滤, 滤液减压蒸除 乙醇, 然后用二氯甲烷重新溶解。 用去离子水分两次洗涤有机层; 有机层溶液 用无水硫酸钠干燥, 减压蒸除二氯甲垸, 用柱层析分离提纯目标产物, 得到红 色固体:
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| CN102590170B (zh) * | 2012-02-28 | 2013-11-20 | 江南大学 | 基于荧光共振能量转移对水溶液中汞离子和/或银离子同时进行检测的方法 |
| CN103242675B (zh) * | 2013-04-28 | 2014-06-18 | 孔凯明 | 一种o,o二齿型有机二氟化硼荧光染料及其制备方法 |
| CN103694269B (zh) * | 2013-11-27 | 2016-04-27 | 中国科学院上海微系统与信息技术研究所 | 一种可检测仲胺的化合物及其制备和应用 |
| CN103666456B (zh) * | 2013-12-02 | 2015-02-04 | 大连理工大学 | 一类氟化硼络合二吡咯甲川荧光探针,其制备方法及应用 |
| CN106565758B (zh) * | 2016-09-30 | 2019-07-02 | 上海师范大学 | 一种可用于简便检测水中铜、汞和银离子的氟硼吡咯类探针及其合成方法 |
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