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
Быстрый ответ
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
| Волновое число (см⁻¹) | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| 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.
Логика спектра
Присвоение функциональной группы становится более надежным, когда несколько ожидаемых полос появляются вместе. Используйте эту страницу, чтобы найти наиболее подтвержденные пики, а затем убедитесь, что тот же образец демонстрирует согласованный паттерн, а не единичное изолированное совпадение.
Использование в реальных условиях
Эти страницы полезны для анализа неизвестных материалов, объяснения пиков в отчетах, устранения неполадок полимеров и проверки химической обоснованности семейства материалов-кандидатов.
Распространенные ошибки
- Использование одной страницы функциональной группы как полного заключения о материале без проверки остальной части спектра.
- Предполагая, что самая сильная полоса всегда является наиболее диагностической.
- Забывая, что обработка, добавки, старение и смеси могут смещать или расширять ожидаемые пики.
Рекомендации по проверке
Используйте DSC, GC-MS или TGA, когда несколько семейств материалов имеют схожие полосы или когда эффекты смеси делают интерпретацию FTIR неопределенной.
Литература, лежащая в основе этих назначений
-
660 cm⁻¹ достоверность 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 достоверность 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 достоверность 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 достоверность 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 достоверность 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 достоверность 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 достоверность 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 достоверность 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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