Age-dependent measurements of amino acids in human hairs — a longitudinal study

Rieck, W.

doi:10.1016/s0167-4943(96)00771-6

Cited by 7 publications

(8 citation statements)

References 19 publications

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“…Hair is composed mainly of keratin protein, which is also the key component of the structural material making up the outer layer of human skin. We considered two previous studies into the change of hair amino acids with age: one showed a reduction of total amino acids in the hair shafts of an older group, 17 and the other concluded that the amino acid composition pattern differs individually with age 25 . We hypothesize that hair keratin might be damaged and become weak, which could explain the age‐related change in amino acid composition.…”

Section: Discussionmentioning

confidence: 95%

Characteristic features of ageing in Korean women’s hair and scalp

Kim¹,

Lee²,

Choi

et al. 2013

British Journal of Dermatology

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Section: Discussionmentioning

confidence: 95%

Characteristic features of ageing in Korean women’s hair and scalp

Kim¹,

Lee²,

Choi

et al. 2013

British Journal of Dermatology

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“…Hydrolysis of hair fi bers and analysis of amino acid composition were performed with a modifi cation of previously reported methods [3,4,25,29] . Five hair fi bers of 1 cm in length, which were selected at random from the same regions as the other comparative tresses, were hydrolyzed with 1 ml 6 M HCl in a sealed ampoule at 110 ° C for 24 h. The hydrolysate in the ampoule was dried using a Centrifugal Concentrator CC-105 (Tomy Seiko, Saitama, Japan).…”

Section: Analysis Of Hydrolyzed Amino Acidsmentioning

confidence: 99%

Damage to Human Hair Caused by Repeated Bleaching Combined with Daily Weathering during Daily Life Activities

et al. 2004

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Background: Although it is well known that chemical oxidation with alkaline hydrogen peroxide damages human hair, little is known about the effects of bleaching during daily life activities which may alter hair components. Objective: To determine the effects of bleaching combined with daily weathering on lipids and amino acids in hair. Methods: Levels of lipids and amino acids were analyzed by chromatography in scalp hair fibers collected from three different females and in experimentally treated hair. Results: Bleaching combined with daily weathering induced the loss of 18-methyleicosanoic acid (18-MEA) and the conversion of half-cystine (H-CYS) to cysteic acid (CYS-A), which were the most remarkable changes among all lipids and amino acids tested. Although a single bleaching had no effect, repeated bleaching combined with daily weathering elicited significant decreases in other intrinsic endogenous lipids and alterations in amino acids that are characteristic for the cuticle. Conclusion: Hair damage, eventually leading to the worst damage such as splitting, is caused by bleaching during daily life activities and is mainly attributable to the loss of 18-MEA as well as the conversion of H-CYS to CYS-A.

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“…In the individual lifetime period, the amount of pigments (melanine) which can bind metals cations also changes [2,3]. There also exist reports on changes o f amino acid com position in human hair with age [4,5] which can be transferred to the elemental composition o f hair. The advantages o f elemental analysis are known and documented in the literature.…”

Section: Introductionmentioning

confidence: 99%