Infrared spectra database - Depository of FTIR spectra of IDAP parchments

This site contains a database depository of the Attenuated Total Reflection / Fourier Transform Infrared (ATR/FTIR) spectra of new, accelerated aged and historical/archival parchments that were collected for the IDAP project in 2005. Damage assessment was based on spectral changes in collagen, in particular within the amide I carbonyl stretching region, which is sensitive to changes in the triple helical structure of collagen. The ATR/FTIR damage assessment has been published elsewhere [1, 2]. 

The findings of the ATR/FTIR of these parchments are in line with damage assessment by atomic force microscopy (AFM), which monitored the eventual loss in the D-spacing of the collagen fibrils, micro-thermal analysis (micro-TA) showing enhanced transitions with increased degradation, and dynamic mechanical analysis with controlled humidity (DMA/RH) which showed that the displacement of parchment under a small strain is reduced with increased RH as a function of increased state of denaturation of collagen [1]. 

The data are classified thematically and according to damage categories to facilitate navigation. 

In the groups, click Switch view and select File view to simplify navigation.

 Considering slight shifts in the frequencies, the spectral information is listed below:

• 3283 cm^-1 : Amide A: >95% ν(NH), and 1st overtone Amide II
• 3073 cm^-1: Amide B: ν(NH) and 1st overtone Amide II 
• 2948 cm^-1 : ν_as(CH₃)
• 2928 cm^-1 : ν_as(CH₂)
• 2878 cm^-1 : v(CH₃) 
• 2865 cm^-1 : v(CH₂) 
• 1720 cm^-1 :  ν(C=O) in –COOH 
• 1631 cm^-1 :  Amide I: 80% ν(C=O) and 20% [ν(CN), δ(NH)] 
• 1580 cm^-1 : ν_as(C=O) in –COO- (Asp and Glu) 
• 1536 cm^-1 :  Amide II: 40-60% δ(NH), and ν(CN)
• 1451 cm^-1 (may be hidden by CaCO₃): δ(CH₂) and δ(CH₃)  
• 1447 cm^-1 : νas(CO₃^2-) in CaCO₃ 
• 1401 cm^-1 (may be hidden by CaCO₃): ν(C=O) in –COO^- 
• 1338 cm^-1 :  Side chain vibration of collagen
• 1286 cm^-1 : Amide III with δ(CH₂) from glycine backbone and proline sidechain 
• 1236 cm^-1 : Amide III: 30% ν(CN), 30% δ(NH), ~20% ν(C-C), ~10% δ(CH) 
• 1202 cm^-1 : Amide III with δ(CH2) from glycine backbone and proline sidechain
• 1163 cm^-1 : ν(C-O) of carbohydrates
• 1084 cm^-1, 1031 cm^-1 : ν(C-O) of carbohydrates and proteoglycans 
• 1062 cm^-1 : ν(C-O) of carbohydrates and ν(SO^3-) of sulphated glycosaminoglycans
• 874   cm^-1 :  ν(CO₃^2-) in CaCO₃ 

References

1. M. Odlyha, C. Theodorakopoulos, J. de Groot, L. Bozec, M. Horton, IDAP - European Commission, Brussels, pp. 73-87. ISBN 978-9279053788 - download

2. M. Odlyha, C. Theodorakopoulos, J. de Groot, L. Bozec, M. Horton, e-Preservation Science 2009, 6, 138-144 - download