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Application Protocols
No validated application protocols are provided for this specific item in the Product Data. If developing a procedure that incorporates Acid Blue 161 (e.g., as a tracer or coloration step):
Establish solution preparation: Determine working concentration empirically; prepare with DI water; adjust pH as needed for substrate interaction; filter before use.
Record spectral parameters: Measure λmax and extinction at the intended pH/ionic strength to ensure quantitative reproducibility.
Conduct small-scale trials: Optimize contact time, temperature, and rinse sequence for your matrix.
Document cleanup: Define appropriate rinse/neutralization steps and waste handling for dye-containing solutions.
For research use only; no diagnostic or clinical protocols are supported.
Biological Roles
Acid Blue 161 is a synthetic laboratory dye; it does not have a native biological role.
Mode of interaction (general):
In biological matrices, acid dyes can associate noncovalently with protonated amine-containing biomolecules (e.g., proteins rich in lysine/arginine) at acidic pH through electrostatic and hydrogen-bonding interactions.
Use context in life sciences (general):
Dyes of this class may be used as visual indicators or tracers in buffer systems, gels, or tissue-processing workflows, subject to validation. Specific staining protocols for Acid Blue 161 are not provided for this SKU.
Biocompatibility/toxicology:
Not specified for this item; consult SDS and perform in-house compatibility tests where contact with cells, enzymes, or tissues is anticipated.
No claims are made regarding bioactivity, selectivity, or suitability for clinical/diagnostic use. For research use only (per Product Data).
Buffer Applications
This product is a dye, not a buffering agent. It does not constitute a defined acid/base conjugate pair for pH control.
Practical note:
If used as a visual marker in buffers, verify that the dye’s spectral properties and binding interactions do not interfere with your assay (e.g., UV absorbance at analytical wavelengths, enzyme inhibition, or interactions with quaternary ammonium reagents).
Confirm stability of color across the working pH and ionic strength. Prepare fresh dye-containing buffers and filter before sensitive optical measurements.
No standard buffer recipes or pKa data are provided for this item.
Green Alternatives
When selecting a blue colorant for aqueous research applications, consider environmental persistence, metal/amine content, and biodegradability. The following points provide a green chemistry perspective for acid-type dyes.
Source reduction and right-sizing:
Use the minimum concentration that achieves adequate visibility or signal; optimize optical pathlength and detector sensitivity to lower dye loads.
Alternative dye classes (general comparison):
Food-grade colorants (e.g., Brilliant Blue FCF, FD&C Blue No. 1) can be preferable for benign tracer studies due to established toxicological profiles, though their spectral properties and substrate affinity differ from acid textile dyes.
Natural dyes (anthocyanins, indigo derivatives) offer renewable sourcing but can be less stable to pH/oxidation and may show batch variability.
Process improvements:
Implement closed-loop rinses and activated carbon or advanced oxidation for dye-laden aqueous waste streams.
Favor aqueous systems over organic solvents; use water-miscible green co-solvents (ethanol, propylene glycol) when needed.
Life-cycle considerations:
Select high dye-content, low-salt formulations to reduce mass throughput and packaging. Bulk formats can minimize packaging waste when appropriate.
Tradeoffs: Food-grade/natural alternatives may not reproduce the exact hue, λmax, or substrate affinity of Acid Blue 161. Where precise color strength and fastness are critical, a synthetic acid dye may remain the practical choice—ensure robust waste handling and minimal release.
Pharmaceutical Uses
No pharmaceutical or clinical uses are specified for this item. Acid Blue 161 is offered for research use only.
Formulation context (general):
Some dyes serve as excipients (colorants) in nonclinical formulations or device visualization aids; however, pharmacopeial acceptance and regulatory status are dye-specific.
Due diligence:
If considering any formulation or device visualization role, confirm regulatory acceptability (e.g., compendial listings, allowable daily intake, impurity limits) for the exact dye identity and grade. For this SKU, such status is not provided; consult the CoA and regulatory references.
No medical, diagnostic, or therapeutic applications are claimed or supported for this product.
Physical Properties
Item-specific numerical specifications are not provided in the Product Data. The following are general characteristics of acid-type blue dyes for laboratory reference; they are not specifications for this SKU.
Appearance (item-specific): Not specified for this item; refer to CoA/Spec Sheet.
Solubility (general/literature):
High solubility in water due to sulfonate groups; solubility frequently improves in warm water and under mildly acidic conditions.
Variable solubility in lower alcohols (e.g., methanol, ethanol) and glycols; limited solubility in nonpolar organic solvents.
UV‑Vis absorption (general/literature):
Acid Blue dyes typically exhibit a strong visible band in the blue region with λmax commonly in the 580–640 nm range for some anthraquinone derivatives or 600–650 nm for select azo systems; exact λmax is dye-specific.
Partitioning/logP (general):
Strongly hydrophilic/anionic; effectively nonvolatile and expected to have a very low logP.
Thermal behavior (general):
Nonvolatile solid; decomposes before boiling; may darken on prolonged heating.
pKa (general):
Sulfonic acid groups are strongly acidic (pKa < 1); dye exists largely as sulfonate anions at neutral pH.
Density, melting point, refractive index (item-specific): Not specified for this item; refer to CoA/Spec Sheet.
Always verify lot-specific physical data (including absorbance characteristics) on the CoA before method validation or quantitative work.
Quality and Grades
Grade/Purity (item-specific): Not specified for this item; refer to CoA/Spec Sheet.
Context for dye-quality parameters (general guidance for acid dyes used in research):
Dye content vs. total solids:
Commercial acid dyes can contain inorganic salts (e.g., NaCl/Na2SO4 as extenders) and variable water. Dye content (absorbance-based) is the key performance parameter for reproducibility in staining or tracer work.
Shade/λmax conformity:
Quality control often includes UV‑Vis spectral checks (λmax, molar absorptivity window, hue index) to ensure lot-to-lot color strength and shade constancy.
Inorganic/organic impurities:
Trace metals and residual aromatic amines are monitored in some applications. If your workflow is sensitive (e.g., catalysis inhibition, sensor backgrounds), request impurity profiles.
Particle size and dusting:
Granular/low-dusting forms reduce handling losses and inhalation risk. If format matters, confirm with Sales/CoA.
Stabilizers/preservatives:
Some dye powders include anti-caking agents; aqueous concentrates may include biocides. For biochemical use, confirm absence/presence of additives.
What is specific for this SKU:
Storage: Room temperature (per Product Data).
Shipping: Normal (per Product Data).
For precise assay (dye content, salts, moisture), and any grade claims (e.g., “biochemical grade”), consult the lot-specific CoA/Spec Sheet prior to quantitative use.
Reaction and Applications
This product is primarily a colorant rather than a synthetic reagent. Nonetheless, acid dyes such as Acid Blue 161 have established laboratory and industrial applications where their anionic character and strong visible absorbance are valuable.
Visualization and tracers (general):
Employ as an aqueous tracer for flow studies, leak testing, or partitioning experiments where a robust visible signal is required. Quantification by UV‑Vis spectroscopy is straightforward after λmax determination for the specific lot.
Substrate interaction (general):
Under acidic conditions (commonly pH 2–5), acid dyes bind protonated amine sites via ionic interactions and secondary hydrogen bonding, enabling coloration of polyamide substrates (nylon), proteins, wool, silk, and certain cationic hydrogels.
Materials and analytics (general):
Use in polymer processing to visualize phase distribution, weld lines, or diffusion fronts; in chromatography/electrophoresis as a mobile phase marker in some custom methods (validate compatibility; canonical tracking dyes differ).
Photophysical studies (general):
As a visible chromophore, suitable for extinction coefficient determinations, dye aggregation studies, and salt/pH effects on spectral shifts.
Practical tips:
Prepare fresh aqueous solutions; filter (0.22–0.45 µm) to remove particulates before optical measurements or microfluidics.
Determine Beer–Lambert linear range for your pathlength and matrix; verify absence of inner-filter effects at higher concentrations.
Record the lot-specific λmax and molar absorptivity under your exact buffer/pH/ionic strength prior to quantitative assays.
Note: No item-specific application claims are provided; adapt general practices to your method and validate locally.
Reaction Conditions
There are no item-specific reaction conditions, as this product is a dye rather than a transforming reagent. For processes that employ acid dyes (e.g., coloration of substrates), literature practices provide useful starting points that must be optimized per system.
Aqueous dyeing of proteinaceous/polyamide substrates (general literature guidance):
Medium: Deionized water, mildly acidified (e.g., 0.1–1% v/v acetic acid) or buffered (acetate) to pH ~3–5.
Temperature: Ambient to 95°C depending on substrate and fastness required; higher temperatures increase diffusion and uptake.
Electrolyte: Addition of sodium sulfate (1–20 g/L) can promote exhaustion onto nylon/wool; titrate to avoid precipitation.
Time: 10–90 minutes typical, with agitation to maintain homogeneity; rinse thoroughly until the wash is nearly colorless.
Spectrophotometric quantitation (general):
Identify λmax in the intended solvent/buffer; construct a calibration curve within the linear range (check for aggregation or inner-filter effects above ~0.5 A units).
Filter solutions (0.22–0.45 µm) to remove particulates and ensure baseline stability.
These conditions are general literature practices for acid dyes and are not specifications or validated protocols for this SKU. Always perform small-scale trials to determine optimal parameters for your specific matrix and endpoint.
Safety and Handling
Hazard classification details are not provided in the Product Data for this item. Treat as a laboratory dye/chemical of unknown hazard profile and consult the SDS for authoritative guidance.
GHS/CLP (item-specific): Not specified for this item; refer to SDS.
General hazards (general/literature for synthetic acid dyes):
May cause irritation to skin, eyes, and respiratory tract upon contact with dusts or concentrated solutions.
Combustible organic solid; may produce irritating fumes under fire conditions.
Recommended PPE and engineering controls:
Wear lab coat, safety glasses or face shield, and appropriate disposable gloves (e.g., nitrile). Avoid generating dust/aerosols; handle in a fume hood when weighing.
Use local exhaust ventilation for solution preparation and transfers.
Storage incompatibilities and precautions:
Store at room temperature as specified; keep container tightly closed and protected from light and moisture to minimize degradation and microbial growth in solutions.
Avoid strong oxidizing agents and strong bases that may alter the chromophore. Segregate from foodstuffs.
Spill/first aid (overview; defer to SDS):
Spills: Avoid dust; collect with damp disposable towels or HEPA vacuum; wash area with water and mild detergent.
Skin/eye contact: Rinse with water for 15 minutes; remove contaminated clothing; seek medical advice if irritation persists.
Inhalation: Move to fresh air; seek medical attention if symptoms occur.
Waste: Dispose according to institutional and local regulations for dye-containing aqueous waste.
Solvent Selection
As an anionic acid dye, Acid Blue 161 is optimized for aqueous systems; solvent choice focuses on achieving full dissolution, stable hue, and compatibility with substrates and matrices.
Polarity and miscibility (general):
Strongly hydrophilic; readily dissolves in water. Miscibility is excellent in water and often acceptable in lower alcohols (methanol, ethanol) and polyols; typically insoluble in nonpolar solvents (hexanes, toluene).
Practical selection by use-case:
Aqueous staining/tracing: Use deionized water; mildly acidify (e.g., acetic/formic acid) to enhance interaction with cationic sites on proteins or polyamides, if compatible with the application.
Polymer dyeing (nylon, wool): Water with acetic acid/sodium acetate buffers; addition of sodium sulfate can promote exhaustion in textile workflows (literature practice).
Organic formulations: If needed in organic media, employ water-miscible co-solvents (e.g., ethanol, isopropanol, dimethyl sulfoxide) to prepare a concentrate, then dilute into the target matrix.
Compatibility notes:
High ionic strength and very high pH can alter shade and solubility; verify color stability across the working pH range.
Avoid strong oxidants/reductants that may bleach or shift the chromophore.
Comparison (general):
Versus basic/cationic blues: Acid blues favor protein/wool/nylon under acidic conditions; basic dyes target anionic substrates (e.g., acrylics) and can precipitate with polyanions.
Versus reactive dyes: Reactive dyes form covalent bonds; acid dyes rely on ionic/hydrogen-bonding interactions and are easier to desorb/remove in many lab contexts.
Storage and Reconstitution
Storage (item-specific): Room temperature (per Product Data). Store in the original, tightly closed container. Keep dry and protect from direct light to preserve shade and prevent clumping.
Shipping: Normal (per Product Data).
Stability (general):
Solid dye powders are typically stable for extended periods when protected from moisture and light. Avoid prolonged exposure to elevated temperatures and high humidity.
Reconstitution and working solutions (general guidance):
Solvent: Use deionized water as primary solvent. For challenging matrices, prepare a concentrated stock in water or in a water/ethanol or water/DMSO mixture, then dilute.
pH: Adjust to application-appropriate acidity (often pH 3–5 for interaction with cationic substrates). Verify color stability across your pH range.
Filtration: Filter freshly prepared solutions (0.22–0.45 µm) to remove undissolved particulates before sensitive analytical or microfluidic use.
Storage of solutions: Prefer freshly prepared solutions. If storage is necessary, keep in amber containers at 2–8°C to limit microbial growth; record any spectral changes before reuse. Discard upon visible precipitation, microbial growth, or hue shift.
Note: Exact shelf life and concentration limits are not specified for this item; refer to the CoA/SDS and validate stability under your conditions.
Structure and Identity
Acid Blue 161 is an anionic synthetic dye of the Acid Blue class, typically designed to be water‑soluble and to bind cationic (protonated) sites on proteinaceous and polyamide materials under acidic conditions.
Item-specific identifiers (Product Data):
CAS: 12392-64-2
CID: 44134493
InChIKey: 196400 (as provided)
SMILES: Not specified for this item; refer to CoA/Spec Sheet.
Molecular Formula: Not specified for this item; refer to CoA/Spec Sheet.
Molecular Weight: Not specified for this item; refer to CoA/Spec Sheet.
Structural class (general/literature):
Acid dyes commonly feature one or more sulfonic acid groups (–SO3H/–SO3−) to impart water solubility, and chromophores derived from azo or anthraquinone motifs.
Functional motifs (general/literature):
Anionic sulfonate groups facilitating ionic interactions with protonated amines (e.g., Lys side chains, nylon amide sites) under acidic pH.
Extended conjugation responsible for intense blue coloration and characteristic visible absorption band(s).
2D structural description (general):
A polyaromatic chromophore with electron-donating/withdrawing substituents and at least one acidic sulfonate functionality; the dye exists as a sodium or other counterion salt in many commercial forms.
Note: Exact structure, isomer distribution, and counterion content can vary by manufacturer and grade; consult the CoA/SDS for definitive structural and compositional information for this specific SKU.
Synthetic Utility
Although not a typical reagent for bond-forming synthesis, Acid Blue 161 can still play enabling roles in materials and analytical workflows.
Indicator/chromophore utility (general):
Serves as a strongly absorbing visible probe for monitoring diffusion, mass transfer, or phase interactions in microreactors and porous materials.
Polymer and surface science:
Used to visualize amine-functional site density/coverage qualitatively on polyamide or aminated surfaces under acidic conditions; color intensity can serve as a rough comparative metric after standardized exposure and rinsing.
Supramolecular and host–guest studies:
The anionic, planar chromophore can act as a reporter for inclusion or binding events (e.g., cyclodextrins, cationic polymers), with spectral shifts or intensity changes upon complexation (literature practice; requires calibration).
Photophysical benchmarking:
Can support extinction coefficient calibrations, scattering corrections, and spectrophotometer validation in the visible range when traceable standards are prepared.
Limitations:
The dye is not designed for stoichiometric or catalytic transformations; it may interfere with sensitive reactions (e.g., redox, radical, or metal-catalyzed) and can chelate or quench catalysts. Validate compatibility before use in synthetic operations.
Target Specificity
Not applicable. This product is a dye, not a biological targeting reagent or antibody. No antigen, epitope, species reactivity, clone, or isotype information is associated with this SKU.
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