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Quantitative and structural analysis of isotopically labelled natural crosslinks in type I skin collagen using LC-HRMS and SANS

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Journal of Leather Science and Engineering 2019年第1期1卷 114-122页

作者： Yi Zhang Rafea Naffa Christopher J.Garvey catherine a.maidment Sujay Prabakar Leather and Shoe Research Association of New Zealand P.O.Box 8094Palmerston North 4472New Zealand Australian Centre for Neutron Scattering ANSTOLucas HeightsNSW 2234Australia

Collagen structure in biological tissues imparts its intrinsic physical properties by the formation of several covalent *** the first time,two major crosslinks in the skin dihydroxylysinonorleucine(HLNL)and histidinohydroxymerodesmosine(HHMD),were isotopically labelled and then analysed by liquid-chromatography high-resolution accurate-mass mass spectrometry(LC-HRMS)and small-angle neutron scattering(SANS).The isotopic labelling followed by LC-HRMS confirmed the presence of one imino group in both HLNL and HHMD,making them more susceptible to degrade at low *** structural changes in collagen due to extreme changes in the pH and chrome tanning were highlighted by the SANS contrast variation between isotopic labelled and unlabelled *** provided a better understanding of the interaction of natural crosslinks with the chromium sulphate in collagen suggesting that the development of a benign crosslinking method can help retain the intrinsic physical properties of the *** analytical method can also be applied to study artificial crosslinking in other collagenous tissues for biomedical applications.

关键词： Crosslinks Isotopic labelling LC-HRMS Quantitative analysis SANS Collagen structure

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RAMAN AND ATR-FTIR SPECTROSCOPY TOWARDS CLASSIFICATION OF WET BLUE BOVINE LEATHER USING RATIOMETRIC AND CHEMOMETRIC ANALYSIS

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Journal of Leather Science and Engineering 2020年第1期2卷 23-37页

作者： Megha Mehta Rafea Naffa catherine maidment Geoff Holmes Mark Waterland NZ Leather and Shoe Research Association(LASRA®) Palmerston NorthNew Zealand School of Fundamental Sciences Massey UniversityPalmerston NorthNew Zealand

There is a substantial loss of value in bovine leather every year due to a leather quality defect known as“looseness”.Data show that 7%of domestic hide production is affected to some degree,with a loss of$35m in export *** investigation is devoted to gaining a better understanding of tight and loose wet blue leather based on vibrational spectroscopy observations of its structural variations caused by physical and chemical changes that also affect the tensile and tear *** regions from the wet blue leather were selected for *** of wet blue bovine leather were collected and studied in the sliced form using Raman spectroscopy(using 532 nm excitation laser)and Attenuated Total Reflectance-Fourier Transform InfraRed(ATR-FTIR)*** purpose of this study was to use ATR-FTIR and Raman spectra to classify distal axilla(DA)and official sampling position(OSP)leather samples and then employ univariate or multivariate analysis or *** univariate analysis,the 1448 cm^(-1)(CH_(2) deformation)band and the 1669 cm^(-1)(Amide I)band were used for evaluating the lipid-to-protein ratio from OSP and DA Raman and IR spectra as indicators of leather ***-fitting by the sums-of-Gaussians method was used to calculate the peak area ratios of 1448 and 1669 cm^(-1 )*** ratio values obtained for DA and OSP are 0.57±0.099,0.73±0.063 for Raman and 0.40±0.06 and 0.50±0.09 for *** results provide significant insight into how these regions can be ***,to identify the spectral changes in the secondary structures of collagen,the Amide I region(1600-1700 cm^(-1))was investigated and curve-fitted-area ratios were *** 1648:1681 cm^(-1)(non-reducing:reducing collagen types)band area ratios were used for Raman and 1632:1650 cm^(-1)(triple helix:α-like helix collagen)for *** ratios show a significant difference between the two *** support this qualitative analysis,logistic regression was performed on t

关键词： Raman spectroscopy Attenuated Total reflectance-Fourier transform InfraRed spectroscopy Principal component analysis Linear discriminant analysis Wet blue Distal axilla Official sampling position

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