Science
Mechanism of Action
As a zwitterionic Good's buffer, MOPS primarily operates by maintaining a stable pH within aqueous formulations, a crucial factor for ensuring ingredient efficacy and product integrity. In biological contexts, concentrations above approximately 0.41852% have been observed to interact with lipid membranes, potentially influencing their permeability and barrier function.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Effective buffering capacity is directly correlated with concentration within this range.
- 02 Potential for altering lipid membranes, affecting cell permeability, and decreasing glucose uptake.
Transparency
Dusting Analysis
At concentrations equal to or exceeding 0.41852% (20 mM), MOPS has been shown to disrupt lipid membranes in mammalian cell culture, compromising cell permeability and reducing glucose uptake by 15-20%. This critical threshold suggests potential for adverse cellular interactions if used at elevated percentages in dermal formulations.
The Formula
Formulation
Stability
MOPS is stable under normal conditions, offering optimal buffering efficacy within a pH range of 6.5 to 7.9. While solutions may discolour to yellow over time, this typically does not impair its buffering characteristics. It also exhibits robust metal-buffer stability, demonstrating no interaction with common metal ions like copper, nickel, manganese, zinc, and cobalt.
Synergies
- Stable with common metal ions (e.g., copper, nickel, manganese, zinc, cobalt)
Conflicts
- strong bases
- strong oxidizing agents
- hydrogen peroxide (slow oxidation to N-oxide form)
Safety
Safety Profile
While generally described as non-toxic and having a low environmental impact in laboratory settings, GHS classifications indicate Morpholinopropane Sulfonic Acid can cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). There are currently no published specific safety assessments for cosmetic use by the Cosmetic Ingredient Review (CIR) or Scientific Committee on Consumer Safety (SCCS). For precision, we advise against exceeding 0.41852% based on mammalian cell culture data.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Morpholinopropane Sulfonic Acid is a valuable buffering agent, critical for maintaining optimal product pH, though its concentration requires careful consideration due to potential cellular interactions at higher levels.
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