Analysis of Ultraviolet Radiation Wavelengths Causing Hardening and Reduced Elasticity of Collagen Gels In Vitro

Maeda, Kazuhisa

doi:10.3390/cosmetics5010014

Cited by 14 publications

(11 citation statements)

References 26 publications

(23 reference statements)

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“…A xenon light source, Lightning Cure LC6 (150 W xenon lamp L8253; Hamamatsu Photonics K. K.; Hamamatsu, Japan), fitted with a UVC cut filter was used for UV-radiation exposure [19]. The spectrum of this xenon light source in the UV region closely resembled that of solar UV radiation, and the intensity of emission was 25 times greater than that of solar UV radiation [19]. The surface and cross-section of hair not exposed to UV radiation and similarly treated hair exposed to the xenon light source for 20 min were observed.…”

Section: Methods Of Exposure To Uv Radiationmentioning

confidence: 99%

Mechanism of Cuticle Hole Development in Human Hair Due to UV-Radiation Exposure

et al. 2018

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Hair is easily damaged by ultraviolet (UV) radiation, bleaching agents or permanent wave treatments, and as damage progresses, hair loses its gloss, develops split ends and breaks. However, the causes of hair damage due to UV radiation have not yet been clarified. We discovered that in one mechanism facilitating damage to wet hair by UV radiation, the unsaturated fatty acids in wet hair produce hydroxy radicals upon exposure to UV radiation, and these radicals produce cuticle holes between the cuticle layers. In wet hair exposed to UV radiation, cuticle holes were produced only between the cuticle layers, whereas when human hair was immersed in a solution containing hydroxy radicals produced by Fenton's reaction, a random production of cuticle holes was noted. It is thought that hydroxy radicals are produced only between the cuticle layers by exposure to UV radiation, and cuticle holes are formed only in this region because one of the polyunsaturated fatty acids, linoleic acid, with a bis-allyl hydrogen, is found between the cuticle layers.

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Section: Methods Of Exposure To Uv Radiationmentioning

confidence: 99%

Mechanism of Cuticle Hole Development in Human Hair Due to UV-Radiation Exposure

et al. 2018

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“…Likewise, Kontomaris et al, showed that UV irradiation caused a significant decline in young's modulus values in collagen fibrils and fibril diameters, length and leads [145]. The above results thus validated the destroyed structural integrity seen in photo-aged human skin, such as dryness, wrinkle formation [146]. Studies have shown that UVA rays exhibit a more substantial effect than UVB rays in destroying collagen, where wavelengths of 300-340 nm caused hardening and reduced elasticity of in-vitro tested collagen gels, with a pronounced effect at 330-nm radiation [147].…”

Section: Collagenesismentioning

confidence: 58%

The role of bioactive phytoconstituents-loaded nanoemulsions for skin improvement: a review

Romes

Wahab

Hamid

2021

Biotechnology & Biotechnological Equipment

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As the largest organ in the human body, the skin should be protected from various harmful chemicals and pollutants from the surrounding environment and ultraviolet (UVA/UVB) radiation emitted from sunlight. This has prompted formulation scientists to embark on new technology to formulate cosmetics free of synthetic chemicals using natural plant-based extracts as the replacement. Natural phytoanti-oxidants, viz. catechin, quercetin and gallic acid, are polyphenols whose therapeutic values (antioxidative, antityrosinase, antiviral and antimicrobial) are underutilized. Plant-based nanoemulsions offer an efficient and safe topical delivery system for improving the skin and regenerative treatment. The bioavailability of the phytoanti-oxidants for molecular-level skin repair is enhanced by better permeation of the nanoemulsions' nano-sized particles through the stratum corneum. This review highlights several phytoconstituent-containing nanoemulsions and their bioactivities for cosmetic applications. The mechanisms of skin improvement for anti-aging skin are also presented in detail. In short, nanoemulsion technology is a powerful tool for an effective topical delivery system of potent skin-protecting and rejuvenating plant-based extracts. With increasing demand from consumers worldwide for nano-formulated phytohormones or phytoextractives, nanoemulsions will see a new dimension with better future prospects.

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“…Lightning Cure LC6 (150 W xenon lamp L8253; Hamamatsu Photonics K. K.; Hamamatsu, Japan) lamps were used as the UV source. A long-pass filter with a 280 nm cutoff (A9616-03; Hamamatsu Photonics K. K.; Shizuoka, Japan) was used in these lamps [27,28]. Hair glossiness was examined using a Glossymeter GL20 (Courage+Khazaka Electronic GmbH; Köln, Germany).…”

Section: Equipmentmentioning

confidence: 99%

Analysis of Lipids in the Medulla of Japanese Hair and Their Function

Ymazaki

Maeda

2018

Cosmetics

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The hair is composed of the cuticle (the outermost surface), cortex (its major part), and medulla (in the hair center). The lipid content of the medulla of Caucasian hair is relatively higher than that of African-American hair. However, the types of lipids therein remain unidentified. The aim of the current study was to analyze the constituent lipids of the medulla of Japanese hair, and to identify their function. A lipid peroxidase fluorescent reagent was used to investigate region-specific differences in the lipid content of the medulla (the tip, middle, and root portions). Since the medulla is important for the hair's glossiness, we also investigated the relationship between the lipid content and hair glossiness. The lipid content of hair, based on the absence or presence of lipid species in the medulla, was investigated using thin-layer chromatography (TLC). Micro-attenuated total reflectance Fourier-transform infrared spectrophotometry (micro-ATR FTIR) was used to analyze the similarities between the standard and medulla lipids, focusing on the methylene/methyl stretching vibration region. The data indicated that the medulla contained unsaturated lipids, the content of which decreased from the root to the tip of the hair. Hair glossiness was reduced with the decreasing lipid content, suggesting that unsaturated lipids of the medulla play a role in glossiness. The TLC analysis revealed differences in the type and amount of hair lipids in the medulla. While squalene and oleic acid spots were detected in hair with a continuously maintained medulla, these compounds were not detected in hair in which the medulla was not maintained. The medulla constituents similar to oleic acid and squalene were also identified by the micro-ATR FTIR spectrum analysis and the previous report. The findings indicate that the medulla is composed of at least squalene and oleic acid.

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Analysis of Ultraviolet Radiation Wavelengths Causing Hardening and Reduced Elasticity of Collagen Gels In Vitro

Cited by 14 publications

References 26 publications

Mechanism of Cuticle Hole Development in Human Hair Due to UV-Radiation Exposure

Mechanism of Cuticle Hole Development in Human Hair Due to UV-Radiation Exposure

The role of bioactive phytoconstituents-loaded nanoemulsions for skin improvement: a review

Analysis of Lipids in the Medulla of Japanese Hair and Their Function

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