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Phase Transition of L-Ser Monohydrate Crystal Studied by (13)C Solid-State NMR

Phase Transition of L-Ser Monohydrate Crystal Studied by (13)C Solid-State NMR

Tsunenori Kameda, Hidetoshi Teramoto

Magn Reson Chem. 2006 Mar;44(3):318-24.

PMID: 16477688

Abstract:

We used gravimetric analysis (GA) and (13)C solid-state nuclear magnetic resonance (NMR) to study solid-phase transition from the transparent single crystal of L-serine (L-Ser) monohydrate to a turbid powder. We found that L-Ser monohydrate loses water molecules and transforms into an anhydrate, thus experimentally demonstrating Frey's assumption. Application of a handmade cross-polarization (CP) NMR probe with a saddle-type coil to the oriented crystal of the L-Ser monohydrate revealed the dehydration mechanism. Furthermore, the chemical shift tensor components of the carboxyl carbon in L-Ser monohydrate were determined. The difference in the tensor component of delta(22) between the monohydrate and anhydrate forms was more than 7 ppm, probably owing to differences in the hydrogen-bonding structure of each form.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP287484326	L-Asparagine-15N2 monohydrate		287484-32-6	Price

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