{"id":12454,"date":"2015-08-05T15:20:32","date_gmt":"2015-08-05T15:20:32","guid":{"rendered":"https:\/\/cnpem.staging.wpengine.com\/?p=12454"},"modified":"2022-01-21T16:53:21","modified_gmt":"2022-01-21T19:53:21","slug":"scientists-discover-new-structural-features-of-human-hair","status":"publish","type":"post","link":"https:\/\/cnpem.br\/en\/scientists-discover-new-structural-features-of-human-hair\/","title":{"rendered":"Scientists discover new structural features of human hair"},"content":{"rendered":"

Sci-news.com<\/a> em 30\/07\/2015<\/p>\n

An international team of scientists \u2013 led by Dr Vesna Stanic of the Brazilian Synchrotron Light Source \u2013 has detected new structural features of human hair<\/em><\/p>\n

 <\/p>\n

\"False-color<\/a><\/p>\n

Human hair structure<\/a> has been studied extensively for more than 70 years, but a complete picture of its local structure has proven elusive.<\/p>\n

\u201cHuman hair is primarily composed of keratin molecules arranged in hierarchical structure, where the fundamental building block is called an intermediated filament,\u201d Dr Stanic said.<\/p>\n

While studying materials used for hair treatments, Dr Stanic and her colleagues wondered what effect these treatments were having on the diffraction pattern of the hair.<\/p>\n

Although diffraction patterns have been examined and reported in several publications in the past, they involved bundles of hair fibers or microdiffraction on single hair fibers; and, most significantly, the X-ray beam was always oriented perpendicular to the hair fiber axis.<\/p>\n

So the scientists decided to take a closer look at the diffraction pattern of the hair by measuring it with an X-ray beam aimed parallel to the hair axis.<\/p>\n

By using a sub-micron X-ray beam and transmission electron microscopy, they were able to spatially resolve the local structure of the three main regions of the human hair: the medulla, the cortex and the cuticle.<\/p>\n

The researchers performed a full diffraction map from a 30 micron thick cross-section of hair, with the incident beam parallel to the hair axis and compared it to the diffraction map with the beam perpendicular to the hair axis.<\/p>\n

\u201cWe found that as one moves the X-ray beam from the exterior of the hair to the medulla, the arrangement of the keratin<\/a> fibrils become increasingly disordered. The combination of the sub-micron X-ray beam and the cross-section geometry enables us to detect a new structural features not previously observed,\u201d Dr Stanic said.<\/p>\n

They discovered that within the cuticle a key diffraction feature of the alpha keratin is absent \u2013 indicating the presence of beta keratin instead of the alpha keratin phase.<\/p>\n

Until now, it was believed that keratin in the whole hair had only an alpha conformation.<\/p>\n

\u201cThe study provides irrefutable experimental evidence of the hair phase variation across the three main regions of hair and is an important step toward gaining a better understanding of hierarchical ordering of the intermediate filaments of keratin,\u201d Dr Stanic said.<\/p>\n

\u201cIt also highlights the importance of using a submicron X-ray beam to unravel the structures of poorly ordered, multiphase systems such as hair.\u201d<\/p>\n

Dr Stanic and co-authors believe the cosmetics industry will benefit from their findings, which were presented on Wednesday, July 29th at the American Crystallographic Association 2015 Meeting<\/em><\/a> in Philadelphia.<\/p>\n","protected":false},"excerpt":{"rendered":"

Sci-news.com em 30\/07\/2015 An international team of scientists \u2013 led by Dr Vesna Stanic of the Brazilian Synchrotron Light Source \u2013 has detected new structural features of human hair  …<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[1163,12,44],"tags":[],"class_list":["post-12454","post","type-post","status-publish","format-standard","hentry","category-clipping-cnpem","category-clipping-lnls","category-clipping-lnnano","category-1163","category-12","category-44","description-off"],"acf":[],"yoast_head":"\nScientists discover new structural features of human hair - CNPEM<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cnpem.br\/scientists-discover-new-structural-features-of-human-hair\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Scientists discover new structural features of human hair - 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