Janus Green B, English name Janus Green, molecular formula C30H31ClN6, CAS 2869-83-2, is a green solid powder at room temperature and pressure. It appears to be soluble in water but slightly soluble in alcohol organic solvents. It has a high solubility in water, especially when dissolved in hot water and appears blue. It is also slightly soluble in alcohol solvents. This property enables it to rapidly diffuse and stain in biological samples. It is a specific live staining agent that can be used for mitochondrial live staining, fungal and protozoan staining, embryo section staining, as well as for redox indicators and copper electroplating additives. It has good applications in basic research fields such as biochemistry and fluorescent dyes. Its molecular structure contains azo dyes, which makes it an effective organic dye. The positive charge in its molecular structure also makes it have certain application value in electroplating materials.
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Chemical Formula |
C30H31ClN6+ |
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Exact Mass |
510 |
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Molecular Weight |
511 |
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m/z |
510 (100.0%), 511 (32.4%), 512 (32.0%), 513 |
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Elemental Analysis |
C, 70.51; H, 6.11; N, 16.44; Cl, 6.94 |
Janus Green B, as an important biological dye, has a wide range of applications in multiple fields.
1. In vivo staining of mitochondria
The most well-known use is as a mitochondrial specific live staining agent. Mitochondria are the "energy factories" in cells, responsible for producing energy molecules such as ATP to maintain cellular life activities. It can specifically stain mitochondria, making them appear blue-green under a high-power microscope, while the cytoplasm is nearly colorless. This staining characteristic enables researchers to clearly observe the distribution, morphology, and quantity of mitochondria in cells, which is of great significance for studying the function, metabolism, and relationship with diseases of mitochondria.
2. Staining of fungi and protozoa
In addition to mitochondrial staining, it can also be used for staining fungi and protozoa. Fungi and protozoa are important objects in biological and medical research, and their morphology, structure, and physiological characteristics are crucial for understanding life processes and disease mechanisms. Its staining properties make these tiny organisms easier to observe and identify under a microscope, providing strong support for related research.
3. Embryo section staining
In developmental biology and embryology research, embryo section staining is an important means of understanding the process of embryo development and structural changes. It can be used for staining embryo slices to help researchers observe and analyze the cellular tissue structure and morphological characteristics of embryos at different developmental stages. This is of great significance for understanding the regulatory mechanisms of embryonic development, the occurrence of genetic diseases, and reproductive health issues.
4. Redox indicator
It also has the function of an oxidation-reduction indicator. In chemical reactions, the oxidation and reduction states of substances are often accompanied by changes in color. Under different redox states, it will exhibit different colors and can therefore be used as an indicator for redox reactions. This characteristic makes it have potential application value in fields such as chemical analysis, environmental monitoring, and the food industry.
Starting from 4-amino-N, N-diethylaniline or p-phenylenediamine (containing N, N-diethylaniline), methylene violet 3RAX is obtained by cyclization with aniline in the presence of an oxidant. Subsequently, Janus Green B is prepared by diazotization and coupling reaction.
Starting material: Assuming we use 4-amino-N, N-diethylaniline as the main starting material. The case of p-phenylenediamine (containing N, N-diethylaniline) may require additional steps to separate or synthesize the desired N, N-diethylsubstituted p-phenylenediamine, but here we focus on the case of a single starting material.
Objective: To cyclize 4-amino-N, N-diethylaniline with aniline or other suitable compounds to form a benzoheterocyclic structure similar to methylene violet 3RAX. Firstly, 4-amino-N, N-diethylaniline is converted into a more easily cyclizable intermediate through some means such as acylation, condensation, etc., and then the intermediate is cyclized with aniline.
Example reaction (not direct, only for illustration):
Acylation reaction (formation of amide intermediate): 4-amino-N, N-diethylaniline reacts with acyl chloride or anhydride to produce the corresponding amide.
4-amino-N, N-diethylaniline+acyl chloride → amide intermediate+HCl
Ring reaction (hypothesis): The amide intermediate is cyclized with aniline under catalyst and/or heating conditions.
Amide intermediate+aniline → intermediate similar to methylene violet 3RAX
Purpose: To ensure that the intermediate contains aromatic primary amines for subsequent diazotization reactions.
Example reaction (if the intermediate is already an aromatic primary amine, skip this step):
If the intermediate is not an aromatic primary amine, it may need to be converted to an aromatic primary amine through reduction, hydrolysis, or other reactions.
Non primary amine intermediate+reducing agent/hydrolyzing agent → aromatic primary amine intermediate
Objective: To convert aromatic primary amine intermediates into diazonium salts.
Chemical equation:
Aromatic primary amine intermediate+nitrous acid+acid → diazonium salt+water
Note: The diazotization reaction is usually carried out at low temperatures (such as below 0 ° C) and under acidic conditions to prevent the decomposition of diazonium salts.
Objective: To couple diazonium salts with suitable phenolic or aromatic amine compounds to form Jianna Green B.
Chemical equation (example): diazonium salts+phenolic or aromatic amine compounds → C30H31ClN6+by-products
Note: Coupling reactions are usually carried out under alkaline conditions to promote the formation of coupling products. Choosing appropriate phenolic or aromatic amine compounds is crucial for obtaining the target product, Jianna Green B.
Additional steps: Purification and post-processing
Objective: To isolate and purify Jianna Green B from the reaction mixture.
Method: This may include techniques such as solvent extraction, crystallization, recrystallization, chromatographic separation (such as column chromatography, thin layer chromatography, HPLC, etc.).
Attention: Purification and post-processing steps are crucial for obtaining high-purity target products. In the laboratory, these steps may need to be repeated multiple times to optimize yield and purity.
In biological experiments, Janus Green B is widely used as a commonly used live staining agent to observe the morphology and distribution of mitochondria. Its unique staining characteristics enable mitochondria to be clearly distinguishable under a microscope, making it an important tool in cell biology research. The following will elaborate on how to prepare a 1% quality fraction of Jianna Green B dye solution. This process not only involves precise weighing and dissolution of chemical reagents, but also careful consideration of factors such as temperature and solvent selection to ensure that the final dye solution is both stable and effective.
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Experimental preparation
Materials and reagents
Jianna Green B Powder:Ensure that the purchased Jianna Green B is of high purity and free of impurities, which is the basis for preparing high-quality dye solutions.
Physiological saline:Physiological saline, also known as 0.9% sodium chloride solution, is often used as a solvent in biological experiments to reduce damage to cells due to its osmotic pressure being similar to that of human cells. In this experiment, physiological saline was used as the dissolution medium for Jianna Green B.
Measuring cylinder:Used for accurately measuring physiological saline solution.
Beaker:Used for dissolving Jianna Green B powder.
Magnetic stirrer (optional):Used to accelerate the dissolution process and ensure that the powder is evenly dispersed in the solvent.
Temperature gauge:Used to monitor and control the temperature during the dissolution process.
Electronic balance:Used for precise weighing of Jianna Green B powder.
Volumetric flask (optional):If higher precision is desired, a volumetric flask can be used for volume determination. But in this simple preparation method, a beaker and a measuring cylinder can be used directly.
Brown glass bottle:Used to store the prepared Jianna Green B dye solution. The brown bottle can prevent the influence of light on the dye solution and maintain its stability.
Safety protection
Wear lab coats:Protect clothing from chemical contamination.
Wear gloves:Prevent direct skin contact with chemical reagents.
Wear goggles:To prevent solution from splashing into the eyes.
Operating in a fume hood:Ensure air circulation in the laboratory and reduce the accumulation of harmful gases.
Preparation steps
Accurately weigh 0.5g of Jianna Green B powder using an electronic balance. Note that the balance needs to be calibrated before weighing to ensure accurate weighing.
Carefully pour the weighed Jianna Green B powder into a clean beaker to prevent the powder from flying.
Accurately measure 50mL of physiological saline using a graduated cylinder. Note that when measuring, the measuring cylinder should be placed on a stable surface, with the line of sight level with the lowest point of the liquid level to ensure accurate measurement.
Slowly pour the measured physiological saline into a beaker containing Jianna Green B powder. Note that it should be poured slowly along the beaker wall to avoid liquid splashing or generating a lot of foam.
Gently stir the solution with a glass rod to help dissolve the Jianna Green B powder. If conditions permit, a magnetic stirrer can be used for stirring to improve dissolution efficiency.
During the stirring process, pay attention to observing the color change of the solution. As Jianna Green B dissolves, the solution should gradually turn dark green or blue-green.
Due to the limited solubility of Jianna Green B at room temperature, in order to improve dissolution efficiency, the beaker can be heated in a water bath to 30-40 degrees Celsius. Note that the temperature should not be too high during heating to avoid damaging the chemical structure of Jianna Green B or causing excessive solvent evaporation.
During the heating process, continue stirring the solution until the Jianna Green B powder is completely dissolved and the solution becomes uniform and transparent.
After dissolution, check the color and transparency of the solution. If there are undissolved particles or uneven color in the solution, stirring or appropriate heating should be continued until the problem is resolved.
If it is necessary to adjust the concentration of the solution, the amount of physiological saline or Jianna Green B powder can be appropriately increased or decreased according to the actual situation. But in this preparation method, we have accurately weighed the reagent according to a mass fraction of 1%, so no additional adjustments are usually required.
Pour the prepared Jianna Green B dye solution into a brown glass bottle and tightly cap it to prevent contamination and volatilization.
Label the bottle with the name, concentration, preparation date, and user's name of the dye solution for future use and management.
Precautions
Accurate weighing:
Ensuring the accurate measurement of health green B powder and physiological saline is the key to preparing high-quality dye solutions.
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Temperature control:
During the heating process, the temperature should be strictly controlled to avoid adverse effects on the quality of the dye solution caused by excessively high or low temperatures.
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Adequate stirring:
Stirring is a key step in ensuring that the green B powder is uniformly dissolved in physiological saline, and should be continued until the solution becomes uniform and transparent.
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Safe operation:
Strictly follow laboratory safety regulations throughout the entire preparation process to ensure personal safety and the safety of the experimental environment.
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Timely use:
Long term storage of the prepared dye solution may still lead to a decrease in its dyeing effect or other chemical changes. It is recommended to use it as soon as possible after preparation to ensure the best staining effect.
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FAQ
1. What is Janus Green B?
Janus Green B is an artificially synthesized basic phenazine-based dye, which is commonly used in biological staining (such as live staining of mitochondria) and as an oxidation-reduction indicator.
2. What are the main purposes?
Mainly used in biological experiments:
- Live staining of mitochondria (as the inner membrane system of mitochondria can restore it to a colorless state, revealing its redox activity).
- Detection of cellular respiration (as an oxidation-reduction indicator, blue indicates the oxidized state, and colorless indicates the reduced state).
- It can also be used as a dye for silk and leather in industry.
3. What is the principle of staining?
In mitochondria, Janus Green B is reduced to a colorless product by enzymes on the inner membrane (such as cytochrome c oxidase) inside the mitochondria; after leaving the mitochondria, it is re-oxidized by oxygen to a blue color. This reversible redox reaction enables it to specifically indicate mitochondrial activity.
4. What should be noted when using?
- The dye concentration and time need to be controlled (typically 0.01%-0.02%), to avoid excessive staining which may interfere with cell activity.
- For some cell types, the staining effect may not be satisfactory. The conditions need to be optimized.
- Store in a dark and sealed container to prevent decomposition.
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