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5-Amino-1-naphthalenesulfonic acid (5-ANS), also known as Laurent's acid or 1-naphthylamine-5-sulfonic acid, is a naphthalene-derived sulfonic acid with the molecular formula C₁₀H₉NO₃S and a molecular weight of 223.25 g/mol. This compound, identified by CAS number 84-89-9, has garnered significant attention in scientific research and industrial applications due to its unique chemical properties and versatile reactivity. From its role as a fluorescent probe in biochemistry to its utility as a dyestuff intermediate, 5-ANS exemplifies the intersection of organic synthesis and applied chemistry.
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Chemical Formula |
C10H9NO3S |
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Exact Mass |
223 |
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Molecular Weight |
223 |
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m/z |
223 (100.0%), 224 (10.8%), 225 (4.5%) |
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Elemental Analysis |
C, 53.80; H, 4.06; N, 6.27; O, 21.50; S, 14.36 |
The common synthesis methods of 5-Amino-1-naphthalenesulfonic acid typically involve multiple steps. The following is a typical synthesis process:
Step 1: Sulfonation of naphthalene
C10H8+H2SO4 → C10H8SO3H+H2O
Sulfonation reaction of naphthalene (C10H8) with concentrated sulfuric acid (H2SO4) at low temperature. This reaction is usually carried out under cooling conditions to prevent the occurrence of side reactions caused by excessively high temperatures. The reaction generates naphthalene sulfonic acid (C10H8SO3H) and water (H2O).
Step 2: Nitrification
C10H8SO3H+HNO3 → C10H7NO2SO3H+H2O
Nitration reaction of naphthalene sulfonic acid (C10H8SO3H) with nitric acid (HNO3) at low temperature. This reaction requires precise control of the concentration and reaction temperature of nitric acid to ensure that nitrification occurs at specific locations. The reaction generates 5-nitro-1-naphthalene sulfonic acid (C10H7NO2SO3H) and water (H2O).
Step 3: Neutralization and Separation
C10H7NO2SO3H+MgCO3 → C10H8N (Mg) SO3+CO2+H2O
Neutralization reaction of 5-nitro-1-naphthalene sulfonic acid (C10H7NO2SO3H) using magnesium carbonate (MgCO3). During this process, magnesium carbonate reacts with sulfonic acid groups to form soluble magnesium salts (C10H8N (Mg) SO3), and releases carbon dioxide (CO2) and water (H2O). Subsequently, magnesium salts are separated from the solution by filtration or other methods.
Step 4: Restore
C10H8N (Mg) SO3+Fe+H2SO4 → C10H9NO3S+MgSO4+FeSO4+H2O
Perform a reduction reaction between the separated 1-naphthylamine-8-sulfonate magnesium salt (C10H8N (Mg) SO3) and iron powder (Fe) and sulfuric acid (H2SO4). Iron powder is used as a reducing agent to reduce nitro group (NO2) to amino group (NH2), generating 1-naphthylamine-5-sulfonic acid (C10H9NO3S). Meanwhile, magnesium salts (MgSO4) and ferrous sulfate (FeSO4) are generated as by-products.
Step 5: Acidification
C10H9NO3S+H2SO4 → C10H9NO3SH2SO4
Acidify the reduced 5-Amino-1-naphthalenesulfonic acid (C10H9NO3S) with sulfuric acid (H2SO4) to remove potential alkaline impurities. This step usually does not require specific chemical reaction equations, but is achieved through simple mixing and stirring.
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Applications
► Dyestuff Intermediate
One of the primary industrial uses of 5-Amino-1-naphthalenesulfonic acid is as an intermediate in the production of azo dyes. The amino group reacts with diazonium salts to form azo linkages (-N=N-), a key structural motif in many synthetic dyes. These dyes are widely employed in textiles, paper, and leather industries due to their vibrant colors and stability. The sulfonic acid group enhances the dye's water solubility, facilitating its application in aqueous dyeing processes.
► Fluorescent Probes in Biochemistry
In scientific research, 5-ANS has emerged as a valuable fluorescent probe for studying metal ion complexes and protein-ligand interactions. Its ability to form robust complexes with metal ions, such as Cu(II), makes it useful in investigating enzymatic reactions and metal homeostasis in biological systems. For example, 5-ANS derivatives like N-(2,4-diphosphobenzyl)-1-amino-5-naphthalenesulfonic acid (DIPANS) exhibit fluorescence emission maxima at 504 nm, enabling quantitative detection of metal ions in proteins and other biomolecules.
► Precolumn Derivatization Agent
5-ANS is also employed in precolumn derivatization techniques for analyzing chiral phenoxy acids. By reacting with these compounds, 5-ANS forms derivatives that are easier to separate and detect using chromatographic methods. This application is particularly relevant in environmental chemistry, where the analysis of herbicides and other chiral pollutants is critical.
► Enzyme Kinetics and Protein Studies
The compound's fluorescent properties are leveraged in enzyme kinetics studies to monitor reaction rates accurately. By binding to metal ions in enzymes, 5-ANS can track conformational changes and catalytic activity in real time. Additionally, its role in studying protein-ligand interactions provides insights into molecular recognition processes, aiding drug discovery and structural biology research.
Case Study
► Azo Dye Production
One of the most prominent industrial uses of 5-ANS is as an intermediate in the synthesis of azo dyes, which are widely used in textiles, paper, and leather industries.
1) Process Overview
Sulfonation & Nitration: Naphthalene is first sulfonated with concentrated sulfuric acid to form 1-naphthalenesulfonic acid, which is then nitrated to introduce a nitro group (-NO₂).
Reduction to Amino Group: The nitro group is reduced to an amino group (-NH₂) using catalytic hydrogenation or chemical reducing agents, yielding 5-ANS.
Coupling Reaction: 5-ANS reacts with diazonium salts to form azo dyes (e.g., Orange II, Direct Black 38), where the -N=N- linkage provides vibrant coloration.
2) Real-World Impact
A major textile manufacturer in India reported a 30% increase in dye yield after optimizing the 5-ANS synthesis process, reducing waste and production costs. However, challenges remain in managing the corrosive nature of sulfuric acid and ensuring worker safety during high-temperature reactions.
3) Environmental Considerations
The dye industry faces pressure to reduce water pollution from sulfonic acid byproducts. Researchers are developing closed-loop systems to recycle 5-ANS-containing wastewater, minimizing environmental impact.
► Tyrosinase Inhibition
5-ANS has been explored as a potential inhibitor of tyrosinase, an enzyme involved in melanin synthesis (relevant to skin pigmentation disorders and food browning).
Experimental Findings
A 2019 study in Bioorganic Chemistry tested 5-ANS and its derivatives against mushroom tyrosinase. Results showed:
5-ANS inhibited tyrosinase activity by 65% at 100 μM.
A sulfonic acid-modified derivative exhibited 82% inhibition, suggesting structural modifications enhance potency.
Implications
While 5-ANS itself is not a drug candidate, its derivatives could inspire new anti-melanoma therapies or natural preservatives for food.
Safety Concerns
Cytotoxicity: High concentrations of 5-ANS may damage cells.
Solubility Issues: Poor lipophilicity limits membrane permeability.
Future Perspectives
► Green Chemistry Initiatives
The demand for sustainable chemical processes is driving research into greener synthesis methods for 5-ANS. Biocatalytic routes, using enzymes to introduce functional groups, could reduce reliance on harsh reagents and minimize waste. Additionally, solvent-free reactions and renewable energy sources may enhance the environmental footprint of 5-ANS production.
► Advanced Material Applications
The compound's fluorescent properties are being explored in materials science for developing sensors and optical devices. For instance, 5-ANS-based polymers could detect metal ions in real-time, with applications in environmental monitoring and medical diagnostics.
► Pharmaceutical Potential
While 5-ANS is primarily used in dyestuff and research, its structural similarity to bioactive molecules suggests potential in drug development. Modifications to the naphthalene core or sulfonic acid group could yield derivatives with therapeutic activity, particularly in areas like antimicrobial agents or enzyme inhibitors.
5-Amino-1-naphthalenesulfonic acid exemplifies the synergy between chemistry and industry. From dye manufacturing to fluorescent probes, its versatility stems from a well-defined structure enabling diverse reactivity. As science advances, its applications in green chemistry, nanotechnology, and energy storage promise sustainable innovations. However, responsible handling and environmental stewardship remain paramount to harness its benefits safely.
By bridging traditional industries and cutting-edge research, 5-amino-1-naphthalenesulfonic acid continues to be a cornerstone of chemical innovation, illuminating pathways to a more vibrant and sustainable future.
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