Molecular Structural Analysis of Spider’s Capture Thread and Viscid Droplets Studied by Microscopic FT-IR Spectroscopy

Study on the Glass Transition Process of Polymer System Using Differential Scanning Calorimetry and Fourier Transform Infrared Spectroscopy

“…By measuring the FT-IR spectral change from 40 to 220 C, they found that the molecular conformation of silk fiber protein of a capture thread is denatured at over 60 C, whereas the viscid droplets on a capture thread retain their structure. 44 This work demonstrates the power of the microscopic FT-IR technique at the micro level. The glass transition process can commonly occur in a polymer system along with the change of parameters, such as the temperature or pressure, which would be accompanied by a micro energy change and a conformation transformation.…”

“…There is much research on polymer systems using the FTIR technique; some of them are combined with other techniques, such as NMR, X-ray etc., which show that FTIR is a powerful tool for analyzing the microscopic structure and energy change in, but not limited to, the polymer system. [34][35][36][37][38][39][40][41][42][43][44] Yabe and coauthors studied the temperature effect on the molecular structure of spider's capture thread by using microscopic FT-IR spectroscopy. By measuring the FT-IR spectral change from 40 to 220 C, they found that the molecular conformation of silk fiber protein of a capture thread is denatured at over 60 C, whereas the viscid droplets on a capture thread retain their structure.…”

Chemometrics and Related Fields in Python

“…Parallel factor analysis (PARAFAC) 61,62 of dimensionality reduction for multi-dimensional array data is included in the scikit-tensor-py3 (sktensor) 63 library. Such multi-dimensional array data are obtained in many different types of instrumental analyses through hyphenated techniques, e.g., GC-MS, [64][65][66] LC-MS, [67][68][69] LC-Vis, 37,70 LC-IR, 71,72 TG-IR, 73,74 etc., as well as fluorescence excitation-emission matrix (EEM) spectroscopy, 75,76 hyperspectral imaging, 77,78 microscopic spectroscopy, 36,79,80 etc.…”

Changes in the Local Structure of Nephila clavipes Dragline Silk Model Peptides upon Trifluoroacetic Acid, Low pH, Freeze-Drying, and Hydration Treatments Studied by 13C Solid-State NMR

“…Information about the structure and dynamics of several silks have been obtained using solid-state NMR, − IR, − Raman, − and X-ray diffraction methods − experimentally. However, it is by no means easy to determine the atomic-level structure because the spider silk proteins have a complex and amorphous nature.…”