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Published on: September 7, 2013
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Correlation Between Sun Protection Factor and Hair Color Difference Index in a New Method for Evaluating Sunscreens'
Jee-Hye Oh1, Go-Woon Choi1, Sung-Ha Park1
1Kolmar Korea Co., Ltd., Seoul, Republic of Korea.
Summary
A new hair sun protection factor (HSPF) method effectively measures UV protection by assessing hair color change. This novel approach correlates well with in vivo sun protection factor (SPF) testing for hair care products.
Area of Science:
- Hair care science
- Photoprotection research
- Cosmetic efficacy testing
Background:
- Evaluating ultraviolet (UV) protection efficacy on hair is crucial.
- Existing methods lack a direct correlation between sun protection factor (SPF) and UV-induced hair color changes.
- A novel hair SPF (HSPF) is proposed to quantify UV damage based on hair color alteration.
Purpose of the Study:
- To establish a novel method for evaluating UV protection efficacy on hair.
- To investigate the relationship between SPF and UV-induced hair color changes.
- To introduce and validate a hair SPF (HSPF) metric.
Main Methods:
- Developed an in vitro method using UV standard samples and CIELAB color space to create an HSPF standard curve based on ΔE values.
- Assessed UV protection of hair care formulations (oils, essences, balms) by comparing their HSPF to the standard curve.
- Validated the in vitro method against in vivo SPF testing (ISO 24444) with human participants.
Main Results:
- Higher SPF products demonstrated reduced hair color fading (smaller ΔE values).
- In vitro HSPF values showed strong correlation with in vivo SPF, especially for oils and balms (R² = 0.734).
- Formulations with high moisture content displayed weaker correlations between in vitro and in vivo results.
Conclusions:
- The developed HSPF provides a new metric for assessing hair UV protection.
- HSPF shows promise for future development and efficacy testing of UV protective hair products.
- This method offers a valuable tool for understanding and quantifying UV damage to hair.
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