The UV-B protective effect of humic substances provide the basis for the development of a peat lipstick
Key Findings
- Natural humic acid from peat and several synthetic humic-acid-like substances were analyzed by UV/VIS spectroscopy (280-800nm) against a PABA reference absorber
- At 100 µg/ml the humic substances absorbed 60-84% of UV-B and roughly 50% of UV-A; at 1000 µg/ml, UV-B filtering was near-total
- U937 cells irradiated with UV-B and then treated with humic substances at 100-1000 µg/ml were protected from UV-induced damage by more than 60%, comparable to PABA
- Peat-derived humic acid alone reached near-complete protection (~108%) at 1000 µg/ml
- Study conducted as part of a peat-lipstick development project aiming to reduce UV-B-triggered herpes labialis recurrence
An in-vitro study investigating humic acids as UV-absorbing, cytoprotective ingredients for a photoprotective peat-derived lipstick. It demonstrates two linked findings: humic substances strongly absorb UV-B and UV-A radiation in a dose-dependent manner, and this translates into measurable cell protection — U937 cells pretreated with humic acid were shielded from UV-B-induced damage by 60% or more, comparable to the reference sunscreen ingredient PABA. This is the first evidence in this library for a dedicated photoprotective mechanism, and it is a single in-vitro study — no clinical or ex-vivo skin data exist yet, and no antiviral or herpes-labialis endpoint was directly tested here despite that being the study’s motivating rationale.
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Altteich peat HA and brown-coal HA (Humin Feed) absorbed 60-84% UV-B and ~50% UVA at 100 µg/ml; protected U937 cells from UV-B damage by >60% at 100-1000 µg/ml, comparable to PABA reference
Direct in-vitro confirmation of the UVB-protection component: humic acids absorbed UV-B/UV-A and protected U937 cells from UV-induced damage by >60% — see mechanisms/photoprotective.md
Humic acids from peat absorbed 60-84% UV-B and ~50% UV-A at 100 µg/ml (near-total UV-B filtering at 1000 µg/ml); protected human U937 cells from UV-B-induced cytotoxicity by >60%, comparable to the UV-B reference absorber PABA
Experimental confirmation (in vitro, U937 cells) of the UV-B-protective effect of humic acids proposed for rosacea in wollina-2009