Hexagonal ice in pure water and biological NMR samples

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• 作者：Thomas Bauer ; Julia Gath ; Andreas Hunkeler ; Matthias Ernst…
• 关键词：Water ; Ice ; protein ; Polarization ; transfer ; Dynamics ; NMR ; Fibrils ; MAS
• 刊名：Journal of Biomolecular NMR
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：67
• 期：1
• 页码：15-22
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Biological and Medical Physics, Biophysics; Biochemistry, general; Spectroscopy/Spectrometry;
• 出版者：Springer Netherlands
• ISSN：1573-5001
• 卷排序：67

文摘

Ice, in addition to “liquid” water and protein, is an important component of protein samples for NMR spectroscopy at subfreezing temperatures but it has rarely been observed spectroscopically in this context. We characterize its spectroscopic behavior in the temperature range from 100 to 273 K, and find that it behaves like pure water ice. The interference of magic-angle spinning (MAS) as well as rf multiple-pulse sequences with Bjerrum-defect motion greatly influences the ice spectra.