Towards an insight on photodamage in hair fibre by<scp>UV</scp>‐light: An experimental and theoretical study

Longo, Valeria; Pinheiro, A. da Silva; Agnelli, José Augusto Marcondes; Longo, E.; Varela, José Arana

doi:10.1111/ics.12054

Cited by 14 publications

(12 citation statements)

References 38 publications

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“…Previous studies of the fluorescence characteristics of the hair suggested that the fluorescence from the tryptophane contributed significantly to the 340 nm band as a correlation was observed between the fluorescence intensity of that band and the number of tryptophanes in UV-damaged hair [12]. What makes the dose response curve steeper at the low UV-radiation doses, is the sufficient number of intact tryptophans per the targeting surface of hair.…”

Section: Figure 5 Changes In Content Of Sh-groups Of Human Hair Expomentioning

confidence: 96%

Changes in Human Hair Induced by UV- and Gamma Irradiation

Palma¹,

González‐Gómez²,

Galicia³

et al. 2016

ABB

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The effect of UV-and 137 Cs gamma radiation on the structural and chemical integrity of human hair was studied to determine the feasibility of using human hair as a non-invasive biomarker of radiation exposure to ionized gamma-and non-ionized UV-radiation. Steady state tryptophan (Trp) fluorescence and chemical analytical methods were used to evaluate the molecular integrity of Trp fluorophores and SH-groups in hair proteins and to assess the radiation induced damage quantitatively. It was found that human hair fibers were progressively damaged by exposure to both UV-and ionized gamma radiation. Damage to the hair was evidenced by a decrease in the fluorescence intensity as a result of observed depletion of the amino acid tryptophan as well as significant reduction in a number of free SH-groups in hair proteins. Hair damage was dose-dependent for exposures between 0 and 10.0 Gy and 0 -20 J/cm 2 of UV-radiation. Additional results demonstrate that hair-fibers exposed to gamma rays, with much higher quantum energy than UV, undergo a smaller extent of changes in Trp fluorescence than when exposed to lower or equal energy of UV-irradiation. The stable Trp fluorophore appears to be extremely sensitive to UVradiation in contrast to the ionized gamma radiation whose damage is originated from the reaction of free radicals and direct deposition of energy. We conclude that fluorescence spectroscopy represents a useful tool in the quantitative evaluation of the radiation exposure and could also be used for the rapid and non-invasive assessment of radiation dose i.e. biodosimeter. The approach is simple, non-invasive and appears to have considerable potential that enables quantitative evaluation of radiation dose exposure in a single hair fiber.

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Section: Figure 5 Changes In Content Of Sh-groups Of Human Hair Expomentioning

confidence: 96%

Changes in Human Hair Induced by UV- and Gamma Irradiation

Palma¹,

González‐Gómez²,

Galicia³

et al. 2016

ABB

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“…UV irradiation induced hair damage is called photodamage. UV irradiation weakens the structural integrity of hair fiber, resulting in the degradation of amino acids 5 , oxidation of internal lipid 6 and melanin granules 7 . Cystine is photo-oxidized into sulfo alanine, which is regarded as an important indicator of the decomposition of hair fiber and in turn affects the mechanical properties of hair fiber 8 .…”

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confidence: 99%

A novel method for non-destructive determination of hair photo-induced damage based on multispectral imaging technology

Cao

Xiong

et al. 2017

Sci Rep

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Extended exposure to sunlight may give rise to chemical and physical damages of human hairs. In this work, we report a novel method for non-destructive quantification of hair photodamage via multispectral imaging (MSI) technology. We show that the multispectral reflectance value in near-infrared region has a strong correlation with hair photodamage. More specifically, the hair segments with longer growing time and the same hair root segment after continuous ultraviolet (UV) irradiation displaying more severe photodamage observed via scanning electron microscopy (SEM) micrographs showed significantly higher multispectral reflectance value. Besides, the multispectral reflectance value of hair segments with different growing time was precisely reproduced by exposing the same hair root segment to specific durations of UV irradiation, suggesting that MSI can be adequately applied to determine the sunlight exposure time of the hair. The loss of cystine content of photodamaged hairs was identified to be the main factor that physiologically contributed to the morphological changes of hair surface fibers and hence the variation of their multispectral reflectance spectra. Considering the environmental information recording nature of hairs, we believe that MSI for non-destructive evaluation of hair photodamage would prove valuable for assessing sunlight exposure time of a subject in the biomedical fields.

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“…When it is desired to evaluate the effects of solar radiation on the degradation of the internal structures of hair [39][40][41][42] or also hair photo-protection obtained by cosmetic ingredients [40][41][42][43], photoluminescence spectroscopy analysis can be used, because in hair amino acids susceptible to photo-degradation such as tryptophan (Trp), an intrinsic fluorophore is present. Disulphide bonds in keratin, where significant losses in Trp, prior to any increase in photo-oxidation products, are detected [42].…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

“…Protein loss [11,12,[44][45][46][47][48]; Electrophoresis [13,25]; Scanning Electron Microscopy [5,[19][20][21][22]; Transmission Electron Microscopy [6,24,25]; Atomic Force Microscopy [7,26,[28][29][30][31]; Optical Coherence Tomography [8,33]; RAMAN spectroscopy [10,[32][33][34] Hair Shine-Gloss Diffuse reflectance spectrophotometry [14,33,43,46,50] Easy to comb Combing resistance [12,64,65] Strength properties Resistance to breakage [12,14,16,33,61,62] Photoprotection Photoluminescence spectroscopy [40][41][42][43] Long-lasting color Diffuse reflectance spectrophotometry [14,…”

Section: Damage Hair Reductionmentioning

confidence: 99%

In Vitro Methodologies to Evaluate the Effects of Hair Care Products on Hair Fiber

2017

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Consumers use different hair care products to change the physical appearance of their hair, such as shampoos, conditioners, hair dye and hair straighteners. They expect cosmetics products to be available in the market to meet their needs in a broad and effective manner. Evaluating efficacy of hair care products in vitro involves the use of highly accurate equipment. This review aims to discuss in vitro methodologies used to evaluate the effects of hair care products on hair fiber, which can be assessed by various methods, such as Scanning Electron Microscopy, Transmission Electron Microscopy, Atomic Force Microscopy, Optical Coherence Tomography, Infrared Spectroscopy, Raman Spectroscopy, Protein Loss, Electrophoresis, color and brightness, thermal analysis and measuring mechanical resistance to combing and elasticity. The methodology used to test hair fibers must be selected according to the property being evaluated, such as sensory characteristics, determination of brightness, resistance to rupture, elasticity and integrity of hair strain and cortex, among others. If equipment is appropriate and accurate, reproducibility and ease of employment of the analytical methodology will be possible. Normally, the data set must be discussed in order to obtain conclusive answers to the test.

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Towards an insight on photodamage in hair fibre byUV‐light: An experimental and theoretical study

Abstract: The biochemistry concerning these reactions is essentially important for a biological system where the degradation of Trp occurs.

Cited by 14 publications

References 38 publications

Changes in Human Hair Induced by UV- and Gamma Irradiation

Changes in Human Hair Induced by UV- and Gamma Irradiation

A novel method for non-destructive determination of hair photo-induced damage based on multispectral imaging technology

In Vitro Methodologies to Evaluate the Effects of Hair Care Products on Hair Fiber

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