کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9594296 | 1395496 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Kinetics of NMR spin-lock polarization transfer in crystalline glycine and spin-lattice relaxation of amino acids
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Kinetics of NMR spin-lock polarization transfer in crystalline glycine and spin-lattice relaxation of amino acids Kinetics of NMR spin-lock polarization transfer in crystalline glycine and spin-lattice relaxation of amino acids](/preview/png/9594296.png)
چکیده انگلیسی
We report data determined from proton-carbon polarization-transfer kinetics at 23°C for six common solid amino acids. Proton spin-lattice relaxation times in the rotating frame, T1ÏH, for α-glycine, alanine, cysteine, leucine, isoleucine, and valine determined from the long-time decay of the carbon magnetization indicate that the presence of a mobile entity such as a methyl group shortens T1ÏH to a few milliseconds. Polarization transfer between protons and carbons in polycrystalline α-glycine is analyzed and compared to theoretical models, two of which account for the variation of polarization-transfer rate with orientation of the dipole-dipole vector in the magnetic field. A generalization of a model proposed by Mueller et al. (Phys. Rev. Lett. 32 (1974) 1402) reproduces the observed polarization transfer in α-glycine with reasonable accuracy, showing that the early time development reflects orientational variation of dipolar oscillations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Nuclear Magnetic Resonance - Volume 27, Issue 3, May 2005, Pages 149-154
Journal: Solid State Nuclear Magnetic Resonance - Volume 27, Issue 3, May 2005, Pages 149-154
نویسندگان
J.M. Smith, C. Dybowski, S. Bai,