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Water-resistant sunscreens for skin protection: an in vivo approach to the two sources of sunscreen failure to maintain UV protection on consumer skin.
Int J Cosmet Sci. 2015 Dec; 37(6):613-9.IJ

Abstract

OBJECTIVES

The water resistance of sunscreen products has taken more importance for the UV protection of consumers involved in water activities and sports. The present work introduces a new in vivo approach to measure the water resistance of sunscreens on the actual skin of subjects, which can be easily applied to salt, chlorine and tap waters. The stress sources of sunscreen films on skin originate from two phenomena: high surface tension stress as the skin transits through the air/water interface and water diffusion into the film immersed in bulk water.

METHODS

The water resistance of sunscreen products is measured on the forearms of subjects by means of a new layered water bath approach that physically separates both stresses. Tape strips are subsequently taken and analysed for UV-A and UV-B optical densities via (1) imaging for remaining filters and (2) in vitro SPF absorption spectra.

RESULTS

Water-resistant sunscreens generally perform well when immersed in bulk water even subjected to agitation, but they show a wide range of performances when considering their behaviour at the air/water interface. The differences are more pronounced in salt water than tap water.

CONCLUSIONS

The results confirm 2 stress origins in sunscreen exposure to water: interfacial surface tension and bulk water diffusion. Polymers bring improvements to the resistance of sunscreens to bulk water but show wide latitude in performances when subject to the water surface tension stress. Globally, a higher loss of filters is observed in the UV-A than in the UV-B, which is attributed to more UV-A filter loss or degradation and thus resulting in a decreased protection in the UV-A.

Authors+Show Affiliations

Ashland Specialty Ingredients, 1005 US 202/206, Bridgewater, NJ, 08807, U.S.A.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25940835

Citation

Puccetti, G. "Water-resistant Sunscreens for Skin Protection: an in Vivo Approach to the Two Sources of Sunscreen Failure to Maintain UV Protection On Consumer Skin." International Journal of Cosmetic Science, vol. 37, no. 6, 2015, pp. 613-9.
Puccetti G. Water-resistant sunscreens for skin protection: an in vivo approach to the two sources of sunscreen failure to maintain UV protection on consumer skin. Int J Cosmet Sci. 2015;37(6):613-9.
Puccetti, G. (2015). Water-resistant sunscreens for skin protection: an in vivo approach to the two sources of sunscreen failure to maintain UV protection on consumer skin. International Journal of Cosmetic Science, 37(6), 613-9. https://doi.org/10.1111/ics.12238
Puccetti G. Water-resistant Sunscreens for Skin Protection: an in Vivo Approach to the Two Sources of Sunscreen Failure to Maintain UV Protection On Consumer Skin. Int J Cosmet Sci. 2015;37(6):613-9. PubMed PMID: 25940835.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Water-resistant sunscreens for skin protection: an in vivo approach to the two sources of sunscreen failure to maintain UV protection on consumer skin. A1 - Puccetti,G, Y1 - 2015/05/25/ PY - 2015/02/04/received PY - 2015/04/25/accepted PY - 2015/5/6/entrez PY - 2015/5/6/pubmed PY - 2016/8/16/medline KW - interfacial tension KW - salt KW - sunscreen KW - water resistance SP - 613 EP - 9 JF - International journal of cosmetic science JO - Int J Cosmet Sci VL - 37 IS - 6 N2 - OBJECTIVES: The water resistance of sunscreen products has taken more importance for the UV protection of consumers involved in water activities and sports. The present work introduces a new in vivo approach to measure the water resistance of sunscreens on the actual skin of subjects, which can be easily applied to salt, chlorine and tap waters. The stress sources of sunscreen films on skin originate from two phenomena: high surface tension stress as the skin transits through the air/water interface and water diffusion into the film immersed in bulk water. METHODS: The water resistance of sunscreen products is measured on the forearms of subjects by means of a new layered water bath approach that physically separates both stresses. Tape strips are subsequently taken and analysed for UV-A and UV-B optical densities via (1) imaging for remaining filters and (2) in vitro SPF absorption spectra. RESULTS: Water-resistant sunscreens generally perform well when immersed in bulk water even subjected to agitation, but they show a wide range of performances when considering their behaviour at the air/water interface. The differences are more pronounced in salt water than tap water. CONCLUSIONS: The results confirm 2 stress origins in sunscreen exposure to water: interfacial surface tension and bulk water diffusion. Polymers bring improvements to the resistance of sunscreens to bulk water but show wide latitude in performances when subject to the water surface tension stress. Globally, a higher loss of filters is observed in the UV-A than in the UV-B, which is attributed to more UV-A filter loss or degradation and thus resulting in a decreased protection in the UV-A. SN - 1468-2494 UR - https://cancerres.unboundmedicine.com/medline/citation/25940835/Water_resistant_sunscreens_for_skin_protection:_an_in_vivo_approach_to_the_two_sources_of_sunscreen_failure_to_maintain_UV_protection_on_consumer_skin_ DB - PRIME DP - Unbound Medicine ER -
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