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Application Protocols
Item-specific tested applications, recommended dilutions, or method-specific protocols are not provided for this product.
Tested applications: Not specified for this item; refer to CoA/Spec Sheet.
Recommended dilutions/working concentrations: Not specified for this item; refer to CoA/Spec Sheet.
Positive controls and workflow-specific instructions: Not specified for this item; refer to CoA/Spec Sheet.
General note: For typical uses (e.g., TBS/TBST washes, SDS-PAGE running/transfer), follow your laboratory’s validated SOPs or authoritative literature methods, ensuring buffer pH is set at the working temperature and verifying compatibility with assay chemistries.
Biological Roles
This product is a laboratory buffer for research use and is not a metabolite or signaling molecule in standard physiological pathways.
Literature context for Tris/Tris–HCl in biological experiments:
Non-physiological buffer: Tris is synthetic and not naturally present at significant levels in cells or plasma.
pH control near neutrality: Maintains the conformational stability of many proteins and protein–protein complexes when set between pH ~7.2–8.5.
Temperature dependence: Because Tris pKa is temperature-sensitive, biological assays at 4 °C vs. 25/37 °C can experience appreciable pH changes if not adjusted at the working temperature, potentially impacting enzyme kinetics, binding affinities, or structural integrity.
Interactions with biomolecules: The primary amine in Tris may compete with lysine side chains or N-termini for acylation and other amine-reactive chemistries, altering labeling efficiencies. Tris can also weakly coordinate metal ions, which may influence metalloprotein behavior or metal-dependent enzymes.
Ionic strength effects: In Tris-buffered saline (TBS), NaCl modulates protein solubility and non-specific interactions. Detergents (e.g., Tween-20) further adjust surface interactions for immunoassays.
Research use only notice (item-specific):
For research use only (per product data). Not intended for human or veterinary use, diagnostics, or therapeutic applications.
Buffer Applications
This product is a Tris–Hydrochloride buffer intended for laboratory use with proteins and related biomolecules. Exact formulation (molarity, pH, additives) is not specified for this item; refer to CoA/Spec Sheet. Below are literature-guidance examples to contextualize use.
Common Tris-based systems (literature examples):
Tris–HCl stock: 1.0 M Tris adjusted to pH 7.4, 8.0, or 8.8 at 25 °C; dilute to working concentrations (10–100 mM) as needed.
TBS (Tris-Buffered Saline): 20–50 mM Tris, 150 mM NaCl, pH 7.4–8.0. For TBS-T, add 0.05% Tween-20 for washing steps.
SDS-PAGE running buffer (Tris–Glycine): 25 mM Tris, 192 mM glycine, 0.1% SDS, pH ~8.3 (no pH adjustment typically required).
Tris–Tricine system: Enhanced resolution for low-MW peptides; consult electrophoresis protocols for precise compositions.
Western transfer buffer: 25 mM Tris, 192 mM glycine, 10–20% methanol.
Practical points:
Adjust pH at use temperature (e.g., 4, 25, or 37 °C).
Use high-purity water; filter (0.22 µm) to reduce particulates and bioburden.
Avoid Tris during amine-reactive labeling or aldehyde fixation; switch to HEPES/phosphate for those steps.
Document lot, pH, and ionic strength for reproducibility.
Note: The above are literature examples provided for context and are not specifications or protocols for this specific catalog item.
Green Alternatives
Tris–HCl buffers are aqueous and generally align with greener laboratory practices compared to organic solvent systems. Still, buffer choice can impact toxicity, downstream waste, and assay performance.
HEPES: Good pH stability against temperature and CO2; low volatility and low toxicity profile in lab settings. Trade-off: Typically more expensive; may absorb strongly at low UV (<230 nm) relative to water.
MOPS/MES (Good’s buffers): Designed for minimal biological reactivity and metal binding; stable pKa across temperature. Trade-off: Cost and potential spectral background at specific wavelengths.
Phosphate: Abundant, inexpensive, and benign from a waste standpoint. Trade-off: Precipitates with Ca2+/Mg2+ and can inhibit or interfere with phosphate-utilizing enzymes and certain binding interactions.
Environmental and safety considerations (general):
Aqueous buffers reduce VOC emissions versus organic media.
Disposal: Follow local regulations. Many Tris buffers are suitable for sewer disposal after neutralization and absent hazardous additives; verify institutional policy.
Concentrate-and-dilute logistics: Using concentrated stocks (e.g., 10× TBS) reduces shipping mass/volume and packaging waste.
Selection guidance:
For workflows sensitive to amine chemistry or requiring tighter pH control over temperature swings, consider HEPES/MOPS as greener-in-practice alternatives due to reduced need for rework and fewer failed runs (less waste). For routine protein work where cost and availability matter, Tris–HCl remains a pragmatic, low-impact choice.
Pharmaceutical Uses
Item-specific pharmacopeial status or GMP suitability: Not specified for this item; refer to CoA/Spec Sheet.
General formulation/manufacturing context (non-clinical, literature):
Processing buffer: Tris–HCl is widely used in biopharmaceutical process development and manufacturing as a process buffer (chromatography equilibration/wash, formulation screening) in the pH 7–9 window due to its strong buffering capacity and compatibility with many proteins.
Excipient role: Tris (trometamol) and Tris–HCl appear in pharmacopeial monographs and may serve as pH adjusters or buffering excipients in drug product development. Compliance must be explicitly documented for any regulated use; absent such statements, this product is for research use only.
Analytical workflows: Used in assay buffers for potency/identity tests of biologics, ELISA platforms, and sample diluents when phosphate interference is a concern.
Operational considerations:
Temperature sensitivity of pH requires control during cold-room processing and fill/finish operations.
Interference with amine-reactive conjugation steps (e.g., ADC linker coupling) suggests substituting with HEPES/MOPS or phosphate during those specific unit operations.
Regulatory note:
This catalog item is designated “For research use only” and is not supplied with claims of clinical or diagnostic suitability. Verify any required standards (USP/EP/JP), bioburden/endotoxin, and change control with the manufacturer when qualifying materials for regulated environments.
Physical Properties
Item-specific physical specifications:
Appearance, pH, concentration, UV cutoff, conductivity, endotoxin/bioburden: Not specified for this item; refer to CoA/Spec Sheet.
Literature/typical properties for Tris–HCl and Tris buffers (for reference only):
pKa (Tris base) at 25 °C: 8.06 (literature). Strong temperature dependence: dpKa/dT ≈ −0.028 per °C.
Effective buffering range (Tris systems): ~pH 7.0–9.0 (literature), commonly 7.4–8.8 for protein work.
Solubility (Tris·HCl): Very soluble in water; sparingly soluble in alcohols (literature).
Hygroscopicity: Tris salts and solutions absorb atmospheric CO2, causing gradual pH drift (literature behavior).
Melting point (Tris·HCl, solid): ~150–152 °C (decomp., literature). Not applicable to aqueous buffer solutions.
Density/refractive index: Concentration-dependent for solutions; not meaningful without specified molarity (item-specific values not provided).
Practical implications:
Because Tris pKa decreases with increasing temperature, a buffer adjusted to pH 8.0 at 25 °C will measure ~7.5–7.7 at 4 °C and ~8.3–8.4 at 37 °C (literature estimate). Calibrate pH at the intended working temperature for critical applications.
Ionic strength and conductivity vary with formulation (Tris molarity, presence of NaCl, and any detergents such as Tween-20). Verify downstream compatibility (e.g., for electrophoresis or chromatography) against the specific product’s CoA.
Note: All numerical values above are literature/typical references and not specifications for this catalog item.
Quality and Grades
Item-specific grade/purity and appearance: Not specified for this item; refer to CoA/Spec Sheet.
Context for buffer-grade materials (general information for professional users):
Molecular biology grade: Low nuclease/protease/endotoxin bioburden; suitable for DNA/RNA/protein workflows where enzymatic integrity is critical. Often 0.22 µm sterilized and DNase/RNase-free certified.
Electrophoresis grade: Controlled conductivity/UV absorbance; low metal and organic impurities to minimize background in gels or detection methods.
Biochemical/reagent grade: Meets general laboratory specifications for routine protein purification, enzyme assays, and immunoassays.
GMP/Pharma processing buffers: Manufactured under quality systems with defined impurity profiles and lot traceability; may align with pharmacopeial monographs (e.g., Tris/Tris HCl), but such compliance must be explicitly stated on the CoA.
Stabilizers and additives:
Tris buffers are typically supplied without stabilizers; ready-to-use formats may include NaCl (TBS) and optional surfactant (e.g., 0.05% Tween-20). This item’s exact composition is not specified.
What to verify on receipt:
pH at 25 °C (and at intended use temperature for critical assays)
Molarity and ionic strength (NaCl content if TBS)
Sterility/bioburden and endotoxin (if applicable)
UV transparency (if using for spectroscopy)
Conclusion: Use the lot-specific CoA/Spec Sheet to confirm suitability for sensitive workflows.
Reaction and Applications
Primary domain: Biochemical/analytical applications rather than synthetic organic reactions.
Common laboratory applications (literature/general):
Protein handling: Lysis buffers, purification (affinity/ion exchange equilibration and wash buffers), storage buffers for enzymes and antibodies in the pH 7.4–8.0 range.
Electrophoresis systems: Tris–Glycine (running/transfer buffers for SDS-PAGE and Western blotting), Tris–Tricine for resolution of low-molecular-weight peptides.
Immunoassays: Tris-buffered saline (TBS) and TBS-T (with Tween-20) for coating, blocking, and wash steps.
Enzymology: Suitable for many enzymes working near neutral/basic pH; verify that Tris does not inhibit or participate in the assay chemistry.
Important compatibility notes (literature/practice):
Amine reactivity: Tris’ primary amine will quench NHS-esters and react with acylation reagents; do not use during amine-labeling of proteins/peptides—use phosphate, HEPES, or bicarbonate instead.
Aldehyde fixatives: Tris reduces the effectiveness of glutaraldehyde and formaldehyde crosslinking; avoid Tris before/ during fixation.
Metal-dependent systems: Tris can weakly chelate some metal ions; evaluate when working with metalloproteins or metal-catalyzed assays.
Temperature sensitivity: Buffer pH shifts with temperature; calibrate and use at a controlled temperature to maintain activity/readouts.
Practical tips:
Prepare with high-purity water; adjust pH with HCl/NaOH at the target temperature.
For long experiments, minimize CO2 exposure (sealed vessels) to reduce upward pH drift.
Filter-sterilize (0.22 µm) for cell-adjacent or low-bioburden workflows.
Item-specific tested applications: Not specified for this item; refer to CoA/Spec Sheet.
Reaction Conditions
This section focuses on preparation and use conditions for Tris–HCl buffer systems rather than chemical reactions.
General preparation guidance (literature):
Stock preparation: Dissolve Tris base in high-purity water, adjust pH with concentrated HCl at the working temperature, and bring to volume. Alternatively, dissolve Tris·HCl and adjust with NaOH if needed. Typical stocks: 0.5–1.0 M.
Working concentrations: 10–100 mM for routine protein work; higher for electrophoresis systems as specified by method.
Temperature considerations: Because pKa decreases ~0.028 per °C, pH set at 25 °C will differ at 4 or 37 °C. Always adjust and report pH at the intended use temperature.
CO2 management: Minimize headspace, use tight caps, and prepare fresh to limit pH drift from atmospheric CO2.
Compatibility notes (literature):
Additives: NaCl (50–500 mM) to tune ionic strength; Tween-20 (0.01–0.1%) for wash buffers; glycerol (5–10%) to stabilize proteins. Verify impacts on assays (e.g., spectroscopic background, enzyme activity).
Sterility: Filter through 0.22 µm for cell-adjacent work; store cold to limit microbial growth.
Performance expectations:
Typical stability: Weeks at 2–8 °C for sterile solutions; days to weeks at RT depending on bioburden (not a specification for this item).
Item-specific composition and pH ranges: Not specified for this item; refer to CoA/Spec Sheet.
Safety and Handling
Item-specific hazard classification and statements:
Signal word / H-statements / GHS classification / pictograms: Not specified for this item; refer to SDS.
General safety guidance for Tris/Tris–HCl buffers (literature/typical):
Hazard profile: Generally considered low hazard for laboratory use; can cause eye, skin, and respiratory irritation. Avoid ingestion and inhalation of powders/aerosols.
PPE: Laboratory coat, safety glasses, and appropriate chemical-resistant gloves (e.g., nitrile). Use in a well-ventilated area; avoid generating aerosols.
First aid overview: Rinse eyes/skin with water for several minutes if contacted; remove contaminated clothing. If inhaled, move to fresh air. If ingested, rinse mouth; seek medical attention as needed. Always consult the SDS for authoritative procedures.
Incompatibilities: Strong oxidizers; Tris solutions can interact with reactive acylating/alkylating reagents (e.g., NHS-esters), aldehyde fixatives (e.g., glutaraldehyde), and some metal ion assays due to the primary amine and polyol functionality (may chelate or quench).
Special risks: pH drift upon CO2 absorption from air; use sealed containers and minimize headspace exposure. For sterile or cell-associated work, prepare with high-purity water and sterile-filter (0.22 µm) to reduce bioburden.
Storage and transport (item-specific):
Storage: Room temperature (per product data). Keep tightly closed.
Shipped: Normal conditions (per product data).
Always defer to the product SDS and institutional safety policies.
Solvent Selection
This product is a buffer (aqueous system), so classical “solvent selection” is about choosing the right aqueous buffering environment for the biomolecular application.
Buffering species: Tris base/Tris–H+ conjugate acid with chloride as counterion; pKa ~8.06 at 25 °C.
Miscibility: Fully miscible with water; incompatible with most neat organic solvents. Limited compatibility with aqueous-organic mixtures at low organic percentages (e.g., <20% MeOH/EtOH) depending on application.
When to choose Tris–HCl vs alternatives:
Protein biochemistry at near-neutral to basic pH (7.4–8.8): Tris–HCl is convenient, inexpensive, and widely used.
Avoid Tris if: Your workflow uses NHS-ester labeling, aldehyde crosslinkers, or relies on accurate pH at variable temperatures (Tris pKa is temperature-sensitive). Consider HEPES (good at 7.0–7.6), MOPS (6.5–7.9), or phosphate (6.0–8.0) as alternatives.
Phosphate: pKa2 7.20; strong metal-binding/precipitation with Ca2+/Mg2+; can inhibit some enzymes and interfere with phosphate-based assays.
Practical tips:
Adjust pH at the temperature of use.
Degas or cap tightly to limit CO2 ingress for better pH stability.
Confirm compatibility with downstream detection (e.g., BCA assay tolerates Tris; certain dye chemistries do not).
Storage and Reconstitution
Item-specific storage and shipping:
Storage conditions: Room temperature (per product data). Keep container tightly closed to limit CO2 absorption and contamination.
Shipped in: Normal conditions (per product data).
Reconstitution/preparation:
Exact instructions (e.g., reconstitution volume, target pH, ionic strength, presence of NaCl/Tween) are not specified for this item; refer to CoA/Spec Sheet.
General best practices (literature/guidance):
Water quality: Use freshly produced, high-purity water (e.g., 18 MΩ·cm) to minimize trace contaminants and microbial growth.
pH adjustment: Adjust at the intended working temperature using HCl or NaOH as appropriate. Record the temperature alongside pH.
Sterilization: For sensitive applications, sterile-filter through 0.22 µm. Aseptic technique extends shelf life.
Storage of solutions: Store sealed at 2–8 °C for routine use; equilibrate to temperature before use to avoid pH drift artifacts. For long-term storage, prepare concentrated, sterile stocks and aliquot; freezing at −20 °C is commonly practiced for months-long stability (literature guidance, not a specification for this item).
Labeling: Include lot number, concentration, pH (with temperature), date of preparation, and any additives.
Research use note:
For research use only (per product data). Not for human or veterinary use.
Structure and Identity
Item-specific identifiers (this catalog item):
Molecular formula: Not specified for this item; refer to CoA/Spec Sheet.
Molecular weight: Not specified for this item; refer to CoA/Spec Sheet.
SMILES / InChI / InChIKey: Not specified for this item; refer to CoA/Spec Sheet.
Literature identity for the typical buffering component (Tris·HCl, “Tris-Hydrochloride”):
Common name: Tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl)
Molecular formula (literature): C4H11NO3·HCl
Molecular weight (literature): ~157.60 g/mol
Representative SMILES (literature): OCC(N)COC.Cl
Representative InChIKey (literature): RQXFKBNXWKSZPB-UHFFFAOYSA-N (note: may vary by tautomeric/ionic representation)
Structural features (literature):
Scaffold: A central amino-methyl carbon bearing three hydroxymethyl substituents; protonated primary amine paired with chloride anion in the hydrochloride salt.
2D structure description: A tetrahedral carbon center attached to –CH2OH groups at three positions and –CH2–NH3+ at the fourth. Hydrogen bonding donors/acceptors throughout enable high water solubility. No stereogenic centers; no aromatic rings.
Notes:
Product name indicates a prepared Tris–HCl buffer formulation. Exact composition (molarity, pH, additives such as NaCl/Tween) is not specified for this item; refer to CoA/Spec Sheet.
If the product is a ready-to-use buffer solution, the chemical identity is a mixture dominated by aqueous Tris/Tris–H+ conjugate acid with chloride counterion at the specified pH (not provided here).
Synthetic Utility
Tris–Hydrochloride buffers are intended for biochemical workflows and are not commonly employed as reagents in synthetic organic chemistry.
Literature perspective on related reactivity (for context only):
Basicity: Tris base is a mild, non-nucleophilic buffer base near pH 8 but, unlike tertiary amines such as TEA, possesses a primary amine and three alcohols. In buffered aqueous media, it is not generally used to promote organic reactions.
Nucleophilicity/quenching: The primary amine readily reacts with activated esters (e.g., NHS-esters) and acyl chlorides/anhydrides, making Tris-containing media effective quenchers of amine-reactive labeling but undesirable during such transformations.
Metal interactions: Weak chelation to some metal ions is reported; however, Tris buffers are not favored in precision metal-catalyzed organic transformations because of coordination and water content.
Practical takeaway:
If conducting chemical synthesis or bioconjugation steps that rely on amine-reactive chemistry, avoid Tris–HCl; select alternative buffers (HEPES, phosphate, bicarbonate) or anhydrous organic solvents as appropriate.
Item-specific synthetic applications: Not specified for this item; refer to CoA/Spec Sheet.
Target Specificity
Not applicable. This product is a buffer, not a biological targeting reagent.
Item-specific details such as antigen, epitope, species reactivity, clone, and isotype are not relevant and are not provided for this item.
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