Structure and reactions of human hair keratin: an analysis by infrared spectroscopy

Baddiel, C. B.

doi:10.1016/0022-2836(68)90405-1

Cited by 39 publications

(33 citation statements)

References 22 publications

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“…Known and unknown sample spectra and background scans were taken in transmittance mode with a spectral range of 2000-500 cm -1 [11,[14][15][16][17][18][19] and a curve fit analysis was studied.…”

Section: Ft-ir (Atr) Spectroscopy Analysismentioning

confidence: 99%

“…The spectral (or "fingerprint") region between 2000-500 cm -1 was curve fitted into the molecular bases for the discrimination observed by Chemometrics [11,[14][15][16]. The region contains bands such as amide-I, II, III, CH2, CH3, deformation and cysteic acid vibrations.…”

Section: Curve-fit Analysis Of Ft-ir Spectramentioning

confidence: 99%

“…In the preferred 1690-1500 cm -1 region, conformational changes keratin protein attributed to the α-helical to β-sheet transitions in the amide I and amide II vibrations played a significant role in matching and discrimination of the spectra and hence, the claw samples [11,[23][24][25][26][27][28][29][30][31][32].…”

Section: Curve-fit Analysis Of Ft-ir Spectramentioning

confidence: 99%

“…FT-IR (ATR) spectroscopy is a vibrational spectroscopic technique used for the nondestructive identification of molecular species, including synthetic fibers. Nail can be easily classified according to their chemical structures [10][11][12]. FT-IR (ATR) spectra provide the band assignments for the characteristic modes of vibration of keratin proteins in the FT-IR spectral region between 1750-750 cm -1 .…”

Section: Introductionmentioning

confidence: 99%

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Non-destructive technique for individualizing trace evidence analysis of tiger nail

Italiya¹,

Ansari²,

Menon³

2017

Forensic Sci Crimino

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Tigers are on the brink of extinction. The greatest threat comes from criminals who control an illegal trade spanning countries and continents. Those animals are illegally killed or poached owing to the high value of their fleece on the black market, and their body parts are used in traditional medicines and jewellery articles. The illegal trade in tiger and lion are one of the most high profile, destructive and urgent forms of wildlife crime. The enforcement response needs to employ advanced, intelligence-led methods of investigation and the engagement of the whole criminal justice system. The response must target the individuals who control this lucrative trade and bring them to justice, and also seize any assets obtained through their crimes. Tiger nail evidence as one of such criteria can provide important information for crime investigation. The present study deals with the new non-destructive technique namely FTIR-ATR (Fourier transform infrared spectroscopy-Attenuated total reflection) and VSC (video spectral comparator) analysis of the Royal Bengal Tiger claw (nail) applied for the first time in wildlife crime investigation especially in a forensic context.

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Section: Ft-ir (Atr) Spectroscopy Analysismentioning

confidence: 99%

Section: Curve-fit Analysis Of Ft-ir Spectramentioning

confidence: 99%

Section: Curve-fit Analysis Of Ft-ir Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Non-destructive technique for individualizing trace evidence analysis of tiger nail

Italiya¹,

Ansari²,

Menon³

2017

Forensic Sci Crimino

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“…However, the amide II spectrum was not observed because the background from water was large, even though KBr had been dried for 2 days in a vacuum. Note that amide I is a complex band caused by a C¼ ¼O stretching vibration coupled to the in-plane bending of NÀ ÀH and stretching of CÀ ÀN bonds, and appears at 1,670 cm 21 in the FT-IR spectrum (Baddiel, 1968). Amide III mode is a combination of NH inplane bending and CN stretching, and is most sensitive to the peptide conformation, which occurs mainly at 1,400-1,200 cm 21 (Baddiel, 1968).…”

mentioning

confidence: 97%

Characterization of human ovarian teratoma hair by using AFM, FT‐IR, and Raman spectroscopy

Kim

Lee

Jung

et al. 2011

Microscopy Res & Technique

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The structural, physical, and chemical properties of hair taken from an ovarian teratoma (teratoma hair) was first examined by atomic force microscopy (AFM), Fourier transform infrared (FT-IR), and Raman spectroscopy. The similarities and differences between the teratoma hair and scalp hair were also investigated. Teratoma hair showed a similar morphology and chemical composition to scalp hair. Teratoma hair was covered with a cuticle in the same manner as scalp hair and showed the same amide bonding modes as scalp hair according to FT-IR and Raman spectroscopy. On the other hand, teratoma hair showed different physical properties and cysteic acid bands from scalp hair: the surface was rougher and the adhesive force was lower than the scalp hair. The cystine oxides modes did not change with the position unlike scalp hair. These differences can be understood by environmental effects not by the intrinsic properties of the teratoma hair.

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The analysis of merino wool cuticle and cortical cells by Fourier transform Raman spectroscopy

1997

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Wool fibers are comprised of proteins known as α‐keratins and have a complex morphological structure. The major components of this structure, the cuticle and cortical cells, differ in the conformations of their peptide chains as well as their amino acid compositions. High quality Fourier transform Raman spectra of cortical and cuticle cells isolated from fine Merino wool fibers have been obtained. Raman spectroscopy has been shown to be sensitive to the differences in both secondary structure and amino acid composition. The cortical cells were found to be higher in α‐helical content as compared to the cuticle cells, which had an increased disordered content. Specific information, consistent with amino acid analysis results, regarding cystine, tyrosine, tryptophan, and phenylalanine residues, were obtained for both the cortical and cuticle cells. In addition, the Raman spectra provided information about free thiol groups, amino acids residues with amide group side chains, and residues with protonated carboxyl group side chains. Middle ir transmission spectra of these isolated cells were also obtained. In comparison to the Raman data, the middle ir spectra were found to be not as rich in information. © 1997 John Wiley & Sons, Inc. Biopoly 42: 7–17, 1997

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Structure and reactions of human hair keratin: an analysis by infrared spectroscopy

Cited by 39 publications

References 22 publications

Non-destructive technique for individualizing trace evidence analysis of tiger nail

Non-destructive technique for individualizing trace evidence analysis of tiger nail

Characterization of human ovarian teratoma hair by using AFM, FT‐IR, and Raman spectroscopy

The analysis of merino wool cuticle and cortical cells by Fourier transform Raman spectroscopy

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