Erythemal UV radiation across Nigeria: where do we stand?

Timothy, C. Egbuim; Onyeuwaoma, Nnaemeka D.; Okere, Bonaventure; Ezenwugo, Mercy  H.; Chukwudi, Augustina O.; Uhiene, Godspower O.; Ugwuozor, Ngozi  D.; Shaibu, Baba  I.; Ugboma, Emeka A.; Ewim, Daniel Raphael Ejike

doi:10.1016/j.heliyon.2022.e10158

Cited by 3 publications

(2 citation statements)

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“…The variability of textured hair occurrence can be linked to skin ethnicity, for example, ranging from ~40% for wavy to ~12% for curly type in European and Asian populations and ~95% for curly type in African populations [6]. A significant proportion of the worldwide population with textured hair also resides in geographical areas with high UV index, which can reach values of ~10 in West Africa, ~9 in South Asia and 15~ in South Africa [9][10][11]. Curly hair can be also freezy and dry, whilst coily or kinky hair type, particularly of African origin, can be also susceptible to brittleness and breakage due to low tensile strength [12,13].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Use of Natural Ingredients for Textured Hair UV Protection

Markiewicz,

Idowu

2024

Preprint

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Human hair is characterized by significant diversity, which is dictated by the individual genetic makeup. It is estimated that up to 70% of the world’s population has textured hair, with a signif-icant proportion also living in areas with high exposure to ultraviolet radiation (UVR). This highlights the unique requirements for textured hair care products that can protect hair shafts from the harmful effects of the environment whilst enhancing the natural features of the fibre. In this study, we investigated the UV-protective effects of hair conditioner formulated from active ingredients, mangiferin, ferulic acid and naringin. The analysis of UV-irradiated straight and textured hair was performed by measurements of hair thickness and darkness, the uptake of the fluorescent dye, spectral absorbance of keratin extracts, ATR-FTIR and SEM. We found that tex-tured hair was more sensitive to UVR-induced changes than straight hair, with the primary mo-lecular targets represented by chemical groups in keratins. Pre-treatment of the hair with condi-tioner had protective effects against structural damage and oxidative stress caused by UVR. These data indicate the importance of the personalized approach to hair research and the formu-lation of hair care products tailored to the individual demands of textured hair types.

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Section: Introductionmentioning

confidence: 99%

Exploring the Use of Natural Ingredients for Textured Hair UV Protection

Markiewicz,

Idowu

2024

Preprint

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“…Clinically, minimal erythema dose (MED) is usually used to evaluate skin sensitivity to ultraviolet radiation. MED refers to the minimum dose (J/m 2 ) or the shortest time (s) in which erythema becomes visible on the skin 24 h after irradiation ( 17 ). While UVA is not primarily responsible for erythema, it does play a significant role in pigmentation ( 11 , 18 , 19 ).…”

Section: Introductionmentioning

confidence: 99%

The role and safety of UVA and UVB in UV-induced skin erythema

Yang

Fan²,

Tan

et al. 2023

Front. Med.

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BackgroundDifferent wavelengths of ultraviolet (UV) light cause skin damage through different mechanisms. Minimal erythema dose (MED) is usually used to clinically evaluate skin sensitivity to ultraviolet radiation by inducing skin erythema using ultraviolet B (UVB) or ultraviolet A (UVA) + UVB.AimsIn this study, we detected changes in the blood flow at the MED erythema caused by UVB and UVA + UVB radiation through optical coherence tomography (OCT) to explain the role of different bands of ultraviolet rays in erythema induction.MethodsTwo MED irradiation areas on the subjects' back were irradiated with UVB alone or UVA + UVB (UVA: UVB = 8:1). The absolute energy of UVB remained the same in UVB and UVA+UVB. At 24 h after the irradiation, the changes in the blood flow in the MED area were detected using OCT.ResultsCompared with the blank control, the maximum blood flow depth, blood flow peak, and total blood flow of UVB-MED and UVA+UVB-MED were significantly increased. Notably, the maximum blood flow depth and blood flow peak of UVB-MED were higher than UVA+UVB-MED. There was no significant difference in total blood perfusion between UVA+UVB-MED and UVB-MED. Under the same UVB energy, the skin erythema caused by UVA + UVB was weaker than UVB alone.ConclusionsThe analysis of local blood flow by OCT showed that the peak and maximum depth of local blood flow caused by UVB alone were significantly higher than UVA + UVB.

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Exploring the Use of Natural Ingredients for the Protection of Textured Hair from Ultraviolet Radiation: An In Vitro Study

Markiewicz,

Idowu

2024

Cosmetics

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Human hair is characterized by significant diversity, which is dictated by the individual genetic makeup. It is estimated that up to 70% of the world’s population has textured hair, with a significant proportion also living in areas with high exposure to ultraviolet radiation (UVR). This highlights the unique requirements for textured hair care products that can protect hair shafts from the harmful effects of the environment whilst enhancing the natural features of the fibre. In this study, we investigated the UV-protective effects of hair conditioner formulated from active ingredients, mangiferin, ferulic acid and naringin. The analysis of UV-irradiated straight and textured hair was performed by measurements of hair thickness and darkness, the uptake of the fluorescent dye, spectral absorbance of keratin extracts, ATR-FTIR and SEM. We found that textured hair was more sensitive to UVR-induced changes than straight hair, with the primary molecular targets represented by chemical groups in keratins. Pre-treatment of the hair with conditioner had protective effects against structural damage and oxidative stress caused by UVR. These data indicate the importance of the personalized approach to hair research and the formulation of hair care products tailored to the individual demands of textured hair types.

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Erythemal UV radiation across Nigeria: where do we stand?

Cited by 3 publications

References 20 publications

Exploring the Use of Natural Ingredients for Textured Hair UV Protection

Exploring the Use of Natural Ingredients for Textured Hair UV Protection

The role and safety of UVA and UVB in UV-induced skin erythema

Exploring the Use of Natural Ingredients for the Protection of Textured Hair from Ultraviolet Radiation: An In Vitro Study

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