29—the Influence of Grinding on the Structure of Keratin

Earland, Christopher; Raven, David J.

doi:10.1080/00405007308630261

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The challenge is to determine the amount of exchangeable hydrogen atoms without causing degradation in these materials. Since both grinding and steaming have been shown to cause degradative damage to keratin sources, we do not favour exposure of proteins to high‐temperature steam as a way of ‘resetting’ exchangeable hydrogen. It should be noted, however, that grinding complex biological tissues can be a valuable approach to ensure homogenization of isotopically variable materials, especially in the preparation of isotopic standards .…”

Section: Discussionmentioning

confidence: 92%

Hydrogen isotopic analysis with a chromium-packed reactor of organic compounds of relevance to ecological, archaeological, and forensic applications

Reynard

Tuross

2016

Rapid Commun. Mass Spectrom.

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The protein and amino acid δ(2) HVSMOW-SLAP values measured by factory-recommended online HTC methods differ from those from Cr-containing reactor packing. The magnitude of the differences is variable with sample type; the molecular structure and diagenetic history of each sample may be important. Careful attention to this effect is therefore recommended for the δ(2) H measurement for all nitrogen-containing analytes. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 92%

Hydrogen isotopic analysis with a chromium-packed reactor of organic compounds of relevance to ecological, archaeological, and forensic applications

Reynard

Tuross

2016

Rapid Commun. Mass Spectrom.

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“…Lanthionine originates by "weathering" and under the effect of alkali on keratin (BAUTEURS 1971, FBASER et al 1972, EARLAND and RAVEN 1973, FLORENCE 1980.…”

Section: Discussionmentioning

confidence: 99%

Metabolism of sulfur‐containing amino acids in the dermatophyte Microsporum gypseum I. Neutral amino acids

Kunert

1985

J. Basic Microbiol.

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The dermatophyte Microsporum gypseum was cultivated on a glucose-arginine medium to which on out of six sulfur-containing amino acids was added (L-cystine, L-djenkolic acid, DL-lanthionine DL-homocystine, L-methionine, or L-methionine-sulfone at a concentration of 5 mM with respect to sulfur content). The addition of these substances did not stimulate the growth and some amino acids (djenkolic acid and particularly methionine and methionine-sulfone) were inhibitory. All tested compounds were utilized during the growth not only as sulfur source but as a source of carbon and nitrogen as well. In four substrates excess sulfur was excreted after oxidation into the medium in the form of sulfate. Small amounts of sulfite were also observed. It usually reacted with remaining disulfides in the medium forming S-sulfo compounds (R-S.SO3H). Cystine and djenkolic acid were oxidized rapidly and completely. In contrast, lanthionine and particularly homocystine were oxidized slowly and only after a longer adaptation. To some extent lanthionine was already oxidized extracellularly in the medium. With methionine and its sulfone, excess sulfur was not removed by oxidation but by demethiolation to methane thiol and further volatile products.

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Infrared study of the effect of heat on wool

Moharram

Abdel-Rehim

Rabie

1981

J of Applied Polymer Sci

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SynopsisThe infrared spectra of wool heated in vacuum and in air to different temperatures ranging from 120 to 250°C were investigated. It was found that certain absorption bands disappear when wool is heated in vacuum to 180°C and in air to 120OC for 2 hr. Also, the results showed that the intensities of the C 4 stretching band at 1660 cm-', N-H stretching band at 3325 cm-I and the C-H stretching band at 2940 cm-I decrease when wool is heated in vacuum to 180°C and in air to 120°C. The spectra of the samples heated in vacuum to 25OOC and in air to 225°C exhibited strong absorption bands belonging to the carboxyl and sulfonate groups.

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29—the Influence of Grinding on the Structure of Keratin

Cited by 5 publications

References 12 publications

Hydrogen isotopic analysis with a chromium-packed reactor of organic compounds of relevance to ecological, archaeological, and forensic applications

Hydrogen isotopic analysis with a chromium-packed reactor of organic compounds of relevance to ecological, archaeological, and forensic applications

Metabolism of sulfur‐containing amino acids in the dermatophyte Microsporum gypseum I. Neutral amino acids

Infrared study of the effect of heat on wool

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