Science
Mechanism of Action
TRIS BUFFERED SALINE (TBS) functions as a non-toxic, isotonic buffer system. Its key component, Tris (Tris(hydroxymethyl)aminomethane), serves as the primary buffering agent, effectively maintaining a stable pH typically between 7.0 and 9.0. Sodium Chloride (NaCl) is incorporated to establish isotonicity, mimicking the osmotic balance found in biological fluids. When integrated into topical skincare formulations, TBS prevents undesirable pH fluctuations and supports the skin's inherent physiological state.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The Tris buffer, a core component of TBS, exhibits a pKa of approximately 8.1 at 25°C, providing effective buffering capacity within a pH range of 7.0 to 9.0. Typical TBS formulations are often adjusted to a pH between 7.4 and 8.0, frequently around 7.6. The pH of Tris buffer solutions is temperature-sensitive, decreasing by approximately 0.03 pH units for every 1°C increase. Once prepared, sterile TBS solutions are reported to be stable for at least 3 months when stored at 4°C, with potential for stability for years under optimal sterile conditions.
Conflicts
- Tris buffers are known to extract nucleic acids from unfixed or methanol-fixed cryostat sections, which is a consideration for specific research applications.
- TBS is often preferred over phosphate-buffered saline (PBS) in formulations that contain metal ions, as phosphate salts have the potential to precipitate these ions.
Safety
Safety Profile
TRIS BUFFERED SALINE is generally characterized as an isotonic and non-toxic substance. While Safety Data Sheets (SDS) typically do not classify it as hazardous, some documents contain cautionary statements regarding potential skin or eye irritation. However, other sections within these SDS may indicate 'no data available' for skin corrosion/irritation or serious eye damage/eye irritation. There is currently no specific review or status from the CIR, SCCS, or FDA for 'TRIS BUFFERED SALINE' as a cosmetic ingredient.
Your Skin
Skin Compatibility
Our Assessment
Verdict
TRIS BUFFERED SALINE is a valuable ingredient for precisely stabilizing cosmetic formulations at a skin-compatible pH and ensuring isotonicity, making it an excellent supportive base for diverse skincare products, particularly those formulated for sensitive skin.
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References
Sources