Confocal Raman Microspectroscopy for Evaluating the Stratum Corneum Removal by 3 Standard Methods

Förster, M.; Bolzinger, Marie‐Alexandrine; Rovere, M.R.; Damour, O.; Montagnac, Gilles; Briançon, Stéphanie

doi:10.1159/000322306

Cited by 35 publications

(23 citation statements)

References 117 publications

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“…On the one hand, the extent of this potential reduction of barrier thickness by hair removal is an interesting observation in itself. On the other hand, knowledge of the reduction of SC thickness through hair removal is an important asset for evaluation of the obtained tape stripping data [40].…”

Section: Crs and Sc Thicknessmentioning

confidence: 99%

Effect of Physical and Chemical Hair Removal Methods on Skin Barrier Function in vitro: Consequences for a Hydrophilic Model Permeant

Pany

Klang²,

Brunner

et al. 2018

Skin Pharmacol Physiol

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Background: Although very common in our society, the effect of hair removal on physiological skin parameters and on the ingress of applied chemicals has not been systematically investigated. Thus, as a first step, the aim of the present study was to elucidate the effect of hair removal through epilation (electric epilation, waxing) and depilation (dry and wet shaving, depilatory cream) on skin properties in vitro using the porcine ear model. Methods: Attenuated total reflection Fourier transform infrared spectroscopy, measurement of the transepidermal water loss (TEWL), visualization by capacitance-based contact imaging, confocal Raman spectroscopy (CRS), diffusion cell studies and tape stripping experiments were employed. Results: Increased TEWL and altered skin permittivity maps were observed. Decreased stratum corneum thickness was observed after waxing. Diffusion cell studies showed increased skin permeation especially in case of dry shaving, electric epilation and waxing. Conclusion: Considering CRS and diffusion cell data, a moderate if significant decrease in skin barrier function was found after hair removal by dry shaving (physical skin/material interaction) and epilation methods (plucking out the entire hair, for example, by electrical epilation and waxing). Subsequent experiments will include testing of different permeants covering a broad range of physicochemical properties in vitro and confirming our findings in vivo.

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Section: Crs and Sc Thicknessmentioning

confidence: 99%

Effect of Physical and Chemical Hair Removal Methods on Skin Barrier Function in vitro: Consequences for a Hydrophilic Model Permeant

Pany

Klang²,

Brunner

et al. 2018

Skin Pharmacol Physiol

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“…Frozen tissue was stored at À80 C until processing. SC samples were prepared from full thickness skin using the enzymatic digest method [14][15][16][17][18]. Subcutaneous fat and connective tissue was removed from the skin.…”

Section: Tissue Preparationmentioning

confidence: 99%

The relationship between water loss, mechanical stress, and molecular structure of human stratum corneum ex vivo

Vyumvuhore

Tfayli

Biniek

et al. 2014

Journal of Biophotonics

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Proper hydration of the stratum corneum (SC) is important for maintaining skin's vital functions. Water loss causes development of drying stresses, which can be perceived as 'tightness', and plays an important role in dry skin damage processes. However, molecular structure modifications arising from water loss and the subsequent development of stress has not been established. We investigated the drying stress mechanism by studying, ex vivo, the behaviors of the SC components during water desorption from initially fully hydrated samples using Raman spectroscopy. Simultaneously, we measure the SC mechanical stress with a substrate curvature instrument. Very good correlations of water loss to the mechanical stress of the stratum corneum were obtained, and the latter was found to depend mainly on the unbound water fraction. In addition to that, the water loss is accompanied with an increase of lipids matrix compactness characterized by lower chain freedom, while protein structure showed an increase in amount of α-helices, a decline in α-sheets, and an increase in folding in the tertiary structure of keratin. The drying process of SC involves a complex interplay of water binding, molecular modifications, and mechanical stress. This article provides a better understanding of the molecular mechanism associated to SC mechanics.

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“…This technique has been applied to study a number of in vivo health-related phenomena in human tissue [1,2,3,4]; it provides a straightforward way to get better insight into the chemical structure and physical behavior of intrinsic molecular components of the stratum corneum (SC) [5,6] and helps to follow up the penetration and action of exogenous molecules [7,8,9,10,11]. …”

Section: Introductionmentioning

confidence: 99%

In vivo Raman Microspectroscopy: Intra- and Intersubject Variability of Stratum Corneum Spectral Markers

Quatela¹,

Miloudi²,

Tfayli³

et al. 2016

Skin Pharmacol Physiol

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Background: In vivo Raman spectroscopy is a powerful tool for real-time analysis and in situ evaluation of tissues such as the skin. The efficiency of this technique has been widely demonstrated as a label-free method for in vivo evaluation of the skin. The aim of this study is to gather information about inter- and intra-individual variations in the spectral descriptors of water content and structure, organization of the lipid barrier and structure of proteins in the stratum corneum (SC). Methods: In vivo SC measurements were performed on 17 female volunteers aged 20-30 years (phototypes I and II). For intra-individual variability, spectral collection was performed on 5 successive days per volunteer. Shapiro-Wilk and Cochran tests were applied to check the normality and the homoscedasticity of variances. ANOVA was then applied to evaluate intra- and intergroup variability. Results: ANOVA was performed on the spectral descriptors of water content and structure, organization of the lipid barrier and secondary structure of proteins in the SC. No significant intra- and interday variability was observed for all volunteers. Despite the low value of the total relative standard deviation, a highly significant variation was observed between volunteers. Conclusion: Interindividual variability for Raman measurements is significant for a set of volunteers with normal nondiseased SC and close phototypes. This variability should be taken into consideration as a threshold for significant variance when working in vivo.

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Confocal Raman Microspectroscopy for Evaluating the Stratum Corneum Removal by 3 Standard Methods

Cited by 35 publications

References 117 publications

Effect of Physical and Chemical Hair Removal Methods on Skin Barrier Function in vitro: Consequences for a Hydrophilic Model Permeant

Effect of Physical and Chemical Hair Removal Methods on Skin Barrier Function in vitro: Consequences for a Hydrophilic Model Permeant

The relationship between water loss, mechanical stress, and molecular structure of human stratum corneum ex vivo

In vivo Raman Microspectroscopy: Intra- and Intersubject Variability of Stratum Corneum Spectral Markers

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