Overview
Methyltetrazine dye is a reactive fluorophore widely used in bioorthogonal chemistry. Its tetrazine group undergoes inverse electron-demand Diels-Alder (IEDDA) reactions with dienophiles like trans-cyclooctene (TCO), enabling rapid, selective conjugation without catalysts. This property makes it invaluable for labeling biomolecules (e.g., proteins, nucleic acids) in live cells or complex environments. The dye’s fluorescence properties (e.g., emission at 500–700 nm) vary based on conjugated chromophores. Common derivatives include methyltetrazine-Cy5 or -TAMRA, tailored for specific imaging platforms. Its stability and minimal background reactivity ensure high signal-to-noise ratios in applications ranging from diagnostics to drug development.
Physical and Chemical Properties
Methyltetrazine dyes exhibit distinct spectral properties, with absorbance/emission peaks depending on the attached fluorophore (e.g., Cy3, Cy5). The tetrazine moiety absorbs near 300–520 nm, often quenching fluorescence until reaction with a dienophile releases the quench, enhancing signal. Chemically, the tetrazine group is highly electrophilic, reacting rapidly with strained alkenes (e.g., TCO) or alkynes. Stability varies: some derivatives degrade under prolonged light exposure or at temperatures above 40°C. Solubility is typically higher in organic solvents like DMSO, though PEGylated variants improve aqueous compatibility for biological assays.
Main Applications
In biomedical research, methyltetrazine dyes enable real-time tracking of biomolecules. For example, they label antibodies for cancer imaging or modify siRNA for delivery studies. Their fast kinetics (k > 1,000 M⁻¹s⁻¹) are critical for time-sensitive processes like endocytosis. Industrial uses include flow cytometry and super-resolution microscopy. In drug development, they conjugate payloads to antibodies (ADCs) or create PET tracers. A niche application is materials science, where they functionalize polymers for sensors or smart coatings.
Safety and Storage
Methyltetrazine dyes are generally low-toxicity but may irritate skin/eyes. Use PPE (gloves, goggles) and handle in a fume hood. Avoid prolonged light exposure to prevent photodegradation. Storage requires desiccated conditions at -20°C, preferably under argon. Solutions in DMSO should be aliquoted to minimize freeze-thaw cycles. Shelf life is typically 6–12 months for solids; check batch-specific stability data.
B2B Procurement Guide
Key procurement factors include purity (≥95% by HPLC), fluorescence specifications (e.g., excitation/emission wavelengths), and solubility. Bulk buyers should request custom synthesis for large-scale projects (e.g., ≥10 g). Suppliers often provide MSDS and technical datasheets. Compare lead times, as some derivatives require 2–4 weeks for synthesis. For OEM contracts, negotiate stability guarantees and batch-to-batch consistency testing.
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