Keratin made micro-tubes: The paradoxical thermal behavior of cortex and cuticle

Istrate, Daniel; Er-Rafik, Mériem; Popescu, C.; Demco, Dan E.; Wortmann, Franz

doi:10.1016/j.ijbiomac.2016.05.035

Cited by 10 publications

(10 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first event, accounted for the desorption of the adsorbed moisture in keratin samples (Td). The second event, near 230°C, accounted for the denaturation of the more crystalline structure of the protein (Tm) [45]. From SAXS and Rheological assays it could be expected that the Tm peak might vary among samples.…”

Section: Differential Scanning Calorimetry (Dsc Thermal Analysis)mentioning

confidence: 99%

Smart release of antimicrobial ZnO nanoplates from a pH-responsive keratin hydrogel

Villanueva

Cuestas

Pérez

et al. 2019

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

A smart antibacterial biomaterial based on a keratin hydrogel with pH-dependent behavior and Zinc Oxide nanoplates as biocide agent has been developed. The pH of a chronic wound is basic due to bacterial metabolism. Originally shrank at acid pH, keratin hydrogels swell upon contact with a bacterial contaminated media leading to the release of the nanoparticles. The material has been thoroughly characterized by infrared spectroscopy, Raman, scanning electron microscope, swelling behavior, Differential scanning calorimetry, Small-angle X-ray scattering, rheology, antimicrobial activity and cytotoxicity. The results show that 5% of Zinc Oxide nanoparticles concentration is the optimum for wound dressing applications.

show abstract

Section: Differential Scanning Calorimetry (Dsc Thermal Analysis)mentioning

confidence: 99%

Smart release of antimicrobial ZnO nanoplates from a pH-responsive keratin hydrogel

Villanueva

Cuestas

Pérez

et al. 2019

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

show abstract

“…Also, circular degradation occurred in irregular periods through the hair axis. 17 In H350, a hollow structure was clearly observed, and the wall thickness of the hair decreased. In particular, the crosssection of the hollow structure was similar to the cross-section of the bamboo joint.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…The degradation of human hair started in the medulla, and it subsequently expanded to the outside, resulting in a hollow microtube. 17 DSC measurements were conducted to investigate the melting of α-helices and the initial degradation of hair. Figure 4A shows a DSC thermogram of human hair.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The cuticle contains some crystalline β-sheet structures and an amorphous matrix with a higher cross-linking density, and it thus has a higher thermal stability than the medulla and cortex. 17 On the contrary, merino wool was only shrunk through a thermal treatment because it contains large amounts of an amorphous domain without the medulla core. 20 Therefore, the thermal degradation of the hair led to a hollow microtube structure due to a complex thermal effect depending on the cystine content and the morphological nature of the hair components.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…16 Recently, Istrate and co-workers reported that keratin microtubes could be obtained by heating keratin fibers at a temperature from 230 to 300 °C under a nitrogen atmosphere. 17 They demonstrated that the resulting hollow tubes were caused by significant differences in the thermal stability between the cortex and the cuticle. The differences in thermal behavior in spite of the similar amino acid compositions of the cortex and cuticle are interesting.…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Formation and Characterization of Hollow Microtubes by Thermal Treatment of Human Hair

Kim

Jung

et al. 2018

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

In this study, hollow microtubes were prepared via stepwise thermal treatment of human hair waste in the middle temperature range from 200 to 450 °C. The effect of the treatment temperature on the thermal decomposition of the hair was examined in terms of the dimension and wall thickness of the microtubes. The thermal decomposition behavior of the hair was analyzed via differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The structure and morphology of the hollow microtubes were examined using scanning electrochemical microscopy (SEM) and elemental analysis (EA). The thermal and morphological observations reveal that the thermal decomposition of the hair started from the core medulla section with the melting of the α-helical structure in the cortex at about 250 °C. As the heat treatment temperature further increased to 450 °C, the degradation of the cortical structure expanded to the outside, and the wall thickness of the hollow microtube decreased. Finally, the hollow microtube structure was completed, and the scaled structure in the cuticle layer became compact and smooth. Therefore, the hollow microtube structure might be a result of the melting and degradation of the cortex and medulla. The adsorption capacity of the hollow microtubes was also evaluated using n-hexane and water.

show abstract

Design of cysteine-S-sulfonated keratin via pH driven processes: Micro-Structural Properties, biocidal activity and in vitro validation

Ramírez

Tonetti

Cruz‐Maya

et al. 2022

European Polymer Journal

View full text Add to dashboard Cite

Keratin made micro-tubes: The paradoxical thermal behavior of cortex and cuticle

Cited by 10 publications

References 16 publications

Smart release of antimicrobial ZnO nanoplates from a pH-responsive keratin hydrogel

Smart release of antimicrobial ZnO nanoplates from a pH-responsive keratin hydrogel

Formation and Characterization of Hollow Microtubes by Thermal Treatment of Human Hair

Design of cysteine-S-sulfonated keratin via pH driven processes: Micro-Structural Properties, biocidal activity and in vitro validation

Contact Info

Product

Resources

About