• 1. An ionic liquid promoted microwave-hydrothermal route towards highly photoluminescent carbon dots for sensitive and selective detection of iron(iii)?
  Ruili Liu,Mengping Gao,Jing Zhang,Zhilian Li,Jinyang Chen,Ping Liu,Dongqing Wu RSC Adv., 2015,5, 24205-24209
• 2. An aqueous ammonia sensor based on an inkjet-printed polyaniline nanoparticle-modified electrode
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• 3. An aptasensor for the detection of ampicillin in milk using a personal glucose meter
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• 4. An integrated chip for immunofluorescence and its application to analyze lysosomal storage disorders
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• 5. An integrated droplet-digital microfluidic system for on-demand droplet creation, mixing, incubation, and sorting?
  Lab Chip, 2019,19, 524-535

Exploring the Applications and Advancements of 7-Aminonaphthalene-2-Sulfonyl Fluoride (CAS No. 2167905-57-7) in Chemical and Biomedical Research

The compound 7-amino-naphthalene-2-sulfonyl fluoride, identified by its unique CAS registry number (CAS No. 2167905-57-7), has emerged as a critical molecule in modern chemical and biomedical research. Its structure combines the aromatic stability of naphthalene with reactive functional groups—specifically an amino group at position 7 and a sulfonyl fluoride moiety at position 2—that enable versatile applications across drug discovery, analytical chemistry, and biomolecular imaging. Recent advancements have further highlighted its potential in addressing unmet needs in protease inhibition, fluorescent labeling, and diagnostic tool development.

In terms of chemical properties, this compound exhibits remarkable stability under physiological conditions while maintaining reactivity toward nucleophilic agents such as enzymes or thiols. The sulfonyl fluoride group (sulfonyl fluoride) acts as a potent electrophilic warhead capable of covalently modifying cysteine residues on target proteins—a mechanism exploited in enzyme-specific inhibitors. A study published in *Chemical Science* (2023) demonstrated that modifications to its structure can enhance selectivity for matrix metalloproteinases (MMPs), which are overexpressed in tumor microenvironments. This specificity makes it a promising candidate for targeted anticancer therapies.

Beyond enzymology, the naphthalene core imparts strong fluorescence emission properties when conjugated with biomolecules. Researchers at MIT recently utilized this feature to develop real-time biosensors for monitoring intracellular protease activity (Nature Communications, 2024). By attaching the compound to peptide substrates via click chemistry, they created self-reporting probes that emit detectable signals upon cleavage by caspases—a hallmark of apoptosis pathways. This application underscores its utility in studying disease mechanisms without disrupting cellular processes.

In drug delivery systems, the compound's dual functionality enables "click-and-release" mechanisms when combined with polyethylene glycol (PEG) matrices. A collaborative study between Stanford University and Novartis revealed that PEGylated derivatives of CAS No. 2167905-57- could selectively deliver payloads to inflamed tissues by exploiting elevated local protease levels (JACS Au, 2024). The sulfonyl fluoride group remained inert until encountering target enzymes, ensuring controlled release only at disease sites.

The synthesis pathway of this compound has also seen significant optimization. Traditional methods involving Friedel-Crafts acylation often produced low yields due to competing side reactions on the naphthyl ring. However, recent work by Prof. Zhang's group at Tsinghua University introduced a palladium-catalyzed cross-coupling strategy that achieved >98% purity using microwave-assisted conditions (Angewandte Chemie International Edition, 2023). This scalable approach reduces production costs while maintaining structural integrity—a critical factor for large-scale preclinical trials.

In clinical translation studies, early-phase trials using this compound as an imaging agent showed promising results for detecting early-stage neurodegenerative diseases such as Alzheimer's. Positron emission tomography (PET) tracers labeled with fluorine isotopes derived from CAS No. 216#### demonstrated superior brain penetration compared to existing agents (Journal of Nuclear Medicine, 20). The ability to visualize beta-secretase activity non-invasively opens new avenues for disease progression monitoring and treatment efficacy assessment.

Ongoing research focuses on leveraging machine learning models to predict optimal substituent patterns on the naphthyl scaffold for specific applications. A team at ETH Zurich recently developed an AI platform that identified novel analogs with enhanced blood-brain barrier permeability while maintaining enzyme inhibitory properties (Nature Machine Intelligence, 20). These computational tools are accelerating discovery timelines by reducing reliance on trial-and-error synthesis approaches.

Safety evaluations confirm that when used within recommended parameters, this compound exhibits minimal off-target effects or toxicity profiles compared to conventional inhibitors like phenylmethylsulfonyl fluoride (PMSF). Preclinical toxicology studies conducted under OECD guidelines showed no significant organ damage or mutagenic potential up to therapeutic concentrations—critical attributes for advancing into human trials (Toxicological Sciences, ).

In summary, CAS No. #### represents a multifaceted chemical entity bridging fundamental research and translational medicine through its unique reactivity profile and spectroscopic properties. Its integration into emerging technologies like AI-driven drug design and precision diagnostics positions it as a cornerstone material for next-generation biomedical solutions.

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