Protein beta turn — FTIR absorption peaks and assignments
These are the characteristic FTIR wavenumbers where Protein beta turn tends to absorb, compiled from published literature and ranked by supporting evidence. Each assignment is traceable to a source (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Réponse rapide
Protein beta turn is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.
Characteristic FTIR peaks for Protein beta turn
| Nombre d＇onde (cm⁻¹) | Faits à l＇appui | Sources citées | Confiance maximale |
|---|---|---|---|
| 1660 | 5 | 5 | 1,0 |
| 1630 | 3 | 3 | 1,0 |
| 1680 | 3 | 3 | 1,0 |
| 1688 | 3 | 3 | 1,0 |
| 1690 | 3 | 3 | 1,0 |
| 1650 | 2 | 2 | 1,0 |
| 1670 | 2 | 2 | 1,0 |
| 1678 | 2 | 2 | 1,0 |
| 1640 | 2 | 2 | 1,0 |
| 1666 | 2 | 2 | 0,9 |
| 1656 | 2 | 1 | 1,0 |
| 1317 | 1 | 1 | 1,0 |
| 1702 | 1 | 1 | 1,0 |
| 1629 | 1 | 1 | 1,0 |
| 1267 | 1 | 1 | 1,0 |
| 1620 | 1 | 1 | 1,0 |
| 1689 | 1 | 1 | 1,0 |
| 1652 | 1 | 1 | 1,0 |
| 650 | 1 | 1 | 1,0 |
| 1080 | 1 | 1 | 1,0 |
| 1686 | 1 | 1 | 1,0 |
| 1683 | 1 | 1 | 1,0 |
| 1653 | 1 | 1 | 1,0 |
| 1694 | 1 | 1 | 1,0 |
| 1671 | 1 | 1 | 1,0 |
| 1665 | 1 | 1 | 1,0 |
| 2006 | 1 | 1 | 1,0 |
| 1542 | 1 | 1 | 1,0 |
| 1642 | 1 | 1 | 1,0 |
| 1600 | 1 | 1 | 1,0 |
Showing the 30 best-supported peaks of 38 total for Protein beta turn.
Logique du spectre
Une attribution de groupe fonctionnel devient plus fiable lorsque plusieurs bandes attendues apparaissent ensemble. Utilisez cette page pour trouver les pics les mieux soutenus, puis confirmez que le même échantillon présente un motif cohérent plutôt qu＇un seul hit isolé.
Utilisation réelle
Ces pages sont utiles pour l＇analyse de matériaux inconnus, l＇explication des pics dans les rapports, le dépannage des polymères et la vérification de la plausibilité chimique d＇une famille de matériaux candidate.
Erreurs courantes
- Utiliser une page de groupe fonctionnel comme verdict complet du matériau sans vérifier le reste du spectre.
- En supposant que la bande la plus forte est toujours la plus diagnostique.
- Oublier que le traitement, les additifs, le vieillissement et les mélanges peuvent décaler ou élargir les pics attendus.
Conseil de vérification
Utilisez DSC, GC-MS ou TGA lorsque plusieurs familles de matériaux partagent des bandes similaires ou lorsque les effets de mélange rendent l＇attribution FTIR incertaine.
Bibliographie derrière ces attributions
-
660 cm⁻¹ confiance 1,0
“wavenumber components of Amide I at about 1,690the 12 low-complexity, highly repetitive blocks, which are mainly 1,660cm-1, β-turns β-sheet assigned to vibrations of unordered and involved in the formation of the crystalline domains, domain”
Biagiotti 等 - 2022 - Electrospun Silk Fibroin Scaffolds for Tissue Rege DOI: 10.3389/fbioe.2022.833157 -
1690 cm⁻¹ confiance 1,0
“Peaks between 1690 and 1665 are generally assigned to β-turn structures.”
Fevzioglu 等 - 2020 - Quantitative approach to study secondary structure DOI: 10.1016/j.ijbiomac.2020.07.299 -
1660 cm⁻¹ confiance 1,0
“The peaks at 1692 1687 (-) cm-1 77 and 100 K are enlarged by 1/0.36 and 1/0.64, respectively, and 1673 can be attributed to the amide I vibrations (+) (-) to normalize the population of D447 photoconverted to S390 of turn structure, and the”
Iwata 等 - 2003 - Light-induced structural changes in the LOV2 domai DOI: 10.1021/bi0345135 -
1676 cm⁻¹ confiance 1,0
“The positive influence of PC2 loadings had three peaks at 1676, 1630 cm-1 assigned to amide I (β-turns and β-sheets), and 1063 cm-1 (mostly might be related to cellulose and hemicellulose) which differentiated the control SR (outstanding) f”
Specific Mycoparasite-Fusarium Graminearum Molecular Signatures in Germinating Seeds Disabled Fusarium Head Blight Pathogen’s Infection DOI: 10.3390/ijms22052461 -
1693 cm⁻¹ confiance 1,0
“bands at 1632, 1641, 1673, and 1680 cm-1 are assigned to β-sheet secondary structures, while those bands at 1632, 1641, 1673, and 1680 cm-1 are assigned to β-sheet secondary structures, while those bands at 1632, 1641, 1673, and 1680 cm-1 a”
Sadat 和 Joye - 2020 - Peak Fitting Applied to Fourier Transform Infrared DOI: 10.3390/app10175918 -
1678 cm⁻¹ confiance 1,0
“The 1678 absorption in the FTIR spectrum of bone is associated with the β-turn conformation of collagen.”
Assessment of collagen quality associated with non-enzymatic cross-links in human bone using Fourier-transform infrared imaging DOI: 10.1016/j.bone.2017.01.015. -
1664 cm⁻¹ confiance 1,0
“cm-1), α-helix There was a significant difference in the band (~1664 which was significantly cm-1) β-turn higher in bulbar patients, while the and loops band (~1680 was significantly more pronounced in samples from spinal ALS patients.”
Synchrotron-Based Fourier-Transform Infrared Micro- Spectroscopy of Cerebrospinal Fluid from Amyotrophic Lateral Sclerosis Patients Reveals a Unique Biomolecular Profile DOI: 10.3390/cells12111451 -
1650 cm⁻¹ confiance 1,0
“The inverted peak at 1618 cm-1 attests the higher content of β-strands cm-1, β-turn a decrease in intensity is observed at 1680 probably due to content which is for hard silk, while the shoulder at 1650 cm-1 is a sign of the high content of”
Historical Silk: A Novel Method to Evaluate Degumming with Non-Invasive Infrared Spectroscopy and Spectral Deconvolution DOI: 10.3390/ma16051819
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