The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey

Lozano, I.; Saunier, J. B.; Panhard, S.; Loussouarn, G.

doi:10.1111/ics.12359

Cited by 12 publications

(20 citation statements)

References 13 publications

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“…The following quantitative hair measurements are calculated automatically by the software system: hair count per cm 2 , sum of hair width per cm 2 , terminal to vellus ratio, and average hair width ( μ m). Additionally, the hair colour is estimated by a 10-point hair colour scale [ 36 ].…”

Section: Methodsmentioning

confidence: 99%

Interrelationships between Skin Structure, Function, and Microbiome of Pregnant Females and Their Newborns: Study Protocol for a Prospective Cohort Study

Wilborn

Kottner

Hillmann

et al. 2021

Dermatology Research and Practice

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Background. Pregnancy leads to several skin changes, but evidence about structural and functional skin changes is scarce. Findings on skin structure and function in children in their first year reveal rapid skin maturation, but evidence indicates that in particular, water holding and transport mechanisms are different from adults. Important questions include whether maternal cutaneous properties predict infant skin condition, and if so, how. This is especially relevant for the skin’s microbiome because it closely interacts with the host and is assumed to play a role in many skin diseases. Therefore, the study objective is to explore characteristics of skin and hair of pregnant women and their newborns during pregnancy and in the first six months after delivery and their associations. Methods. The study has an observational longitudinal design. We are recruiting pregnant females between 18 and 45 years using advertisement campaigns in waiting areas of gynecologists and hospital’s outpatient services. A final sample size of n = 100 women is the target. We perform noninvasive, standardized skin, hair, and skin microbiome measurements. We establish the baseline visit during pregnancy until at the latest four weeks before delivery. We schedule follow-up visits four weeks and six months after birth for mothers and their newborns. We will calculate descriptive statistical methods using frequencies and associations over time depending on scale levels of the measurements. Discussion. The majority of previous studies that have investigated infants’ skin microbiome and its associations used cross-sectional designs and focused on selected characteristics in small samples. In our longitudinal study, we will characterize a broad range of individual and environmental characteristics of mothers and their newborns to evaluate interrelationships with skin parameters and their changes over time. Considering the combination of these multiple variables and levels will allow for a deeper understanding of the complex interrelationship of the newborn’s skin maturation. This trial is registered with ClinicalTrials.gov (Identifier: NCT04759924).

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Section: Methodsmentioning

confidence: 99%

Interrelationships between Skin Structure, Function, and Microbiome of Pregnant Females and Their Newborns: Study Protocol for a Prospective Cohort Study

Wilborn

Kottner

Hillmann

et al. 2021

Dermatology Research and Practice

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“…The first was Reed’s function (Reed, 1952): where y 400 , y 530 , and y 650 are the arithmetical means of three measurements of percentage reflectance values at wavelengths in the subscript. The second was the CIE L*a*b* color space: it provided the a* parameter which ranges from −100 (green) to +100 (red) (Lozano, Saunier, Panhard, & Loussouarn, 2017; Vaughn, van Oorschot, & Baindur-Hudson, 2008).…”

Section: Methodsmentioning

confidence: 99%

Increased calcidiol level in redhaired people: Could redheadedness be an adaptation to temperate climate?

Flegr

Sýkorová

Fiala

et al. 2019

Preprint

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About 1-2% of European population are redhaired, meaning they synthesize more 19 pheomelanin than eumelanin, the main melanin pigment. Several mutations could be 20 responsible for this phenotype. It has been suggested that corresponding mutations spread in 21 Europe due to a founder effect shaped either by a relaxation of selection for dark, UV-22 protective phenotypes or by sexual selection in favor of rare phenotypes. In our study, we 23 investigated the levels of vitamin D precursor calcidiol and folic acid in the blood serum of 24 73 redhaired and 130 non-redhaired individuals. In redhaired individuals, we found higher 25 calcidiol concentrations and approximately the same folic acid concentrations as in non-26 redhaired subjects. Calcidiol concentrations correlated with the intensity of hair redness 27 measured by two spectrophotometric methods and estimated by participants themselves and 28 by independent observers. In non-redhaired individuals, calcidiol levels covaried with the 29 amount of sun exposure and intensity of suntan while in redhaired individuals, this was not 30the case. It suggests that increased calcidiol levels in redhaired individuals are due to 31 differences in physiology rather than in behavior. We also found that folic acid levels 32 increased with age and the intensity of baldness and decreased with the frequency of visiting 33 tanning salons. Our results suggest that the redhaired phenotype could be an evolutionary 34 adaptation for sufficient photosynthesis of provitamin D in conditions of low intensity of UV-35 B radiation in central and northern parts of Europe.36

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“…Tresses of a certain length and weight (10 cm × 1.5 g) were bleached with H 2 O 2 (12% for 30 min) and washed with tap water (6 cycles). The bleached tress was color recorded [17] before a slow application (1 min) of the developed black bean hair coloring gel (1.5 g) and then blow-dried (Philips Voyager Twist 1400, Thailand) at a distance of 5 cm from the tress with heat of level 2, followed by color recording. The dried and dyed tress was rinsed with 0.1 g Kodomo Baby Shampoo (Lion, Thailand) in tap water (300 ml), blow-dried and color recorded.…”

Section: The Development Of a Hair Coloring Gel Containing Black Beanmentioning

confidence: 99%

“…The black bean hair coloring gel was then applied to the bleached tress. Color in terms of L*, a* and b* was used as the international standard method, with grey hair having a higher L* (13-83) and a lower a* (2-7) and b* (0-13) [17]. In addition, h* was recorded based on the nature of the anthocyanin colorant extract.…”

mentioning

confidence: 99%

Alternative application approach on black bean: hair coloring product

Inman

Lourith

Kanlayavattanakul

2020

Chem. Biol. Technol. Agric.

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Background: Black bean is one of the important beans as the second most consumed bean globally after soybean. It has been reported as a sustainable source of anthocyanins, important natural colorants used in food and consumer products. However, industrial uses of black bean anthocyanins in pharmaceutics and cosmetics have rarely been explored. Thus, here, a black bean anthocyanin extract was prepared, quality controlled and developed into an efficient hair coloring product. Results: Black bean was macerated in hydrochloric ethanol to produce a dark-reddish 1.85 ± 0.04% dry extract with total anthocyanin content (TAC) of 1.24 ± 0.48 µg/ml cyanidin-3-glucoside. The extract was readily dissolved in propylene glycol (25%), giving a reddish to red-brownish solution at pH of 4.00-7.00. The addition of antioxidant significantly (p = 0.000) enhanced the stability of the extract in an accelerated stability test (90.34 ± 5.32 from 67.83 ± 3.45% TAC remaining). Three base hair gels containing different thickeners were developed to yield clear gels with a viscosity of 101,666.67-447,333.33 cps and a pH of 4.80-4.97. The gel base with the best hair application properties was chosen to mix with 8, 10 and 12% black bean extract to produce similar visually assessed red-brown gels (L* = 33.25-33.76, a* = 0.06-0.09, b* = − 0.45-0.38 and h* = 277.54-283.31) at 73,733.33-99,666.67 cps and a pH of 5.00-5.01. All of the black bean hair coloring gels were stable under the accelerated test. The 10% hair gel was tested for its hair staining efficacy. The black bean hair coloring gel was found to efficiently color hair, and the color was maintained through four washings. Conclusions: An alternative application approach of using black bean as a natural colorant is presented here, including its basic requirements for preparation and quality control from an industrial aspect. The efficient semi-permanent hair coloring product containing black bean is an innovative natural product and is considered as one progress towards a sustainable bio-based economy using a readily available industrial crop, black bean.

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The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey

Cited by 12 publications

References 13 publications

Interrelationships between Skin Structure, Function, and Microbiome of Pregnant Females and Their Newborns: Study Protocol for a Prospective Cohort Study

Interrelationships between Skin Structure, Function, and Microbiome of Pregnant Females and Their Newborns: Study Protocol for a Prospective Cohort Study

Increased calcidiol level in redhaired people: Could redheadedness be an adaptation to temperate climate?

Alternative application approach on black bean: hair coloring product

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