Keiji Yamamoto
Chiba University
262 Papers
2.4K Citations
Keiji Yamamoto is an academic researcher from Chiba University. The author has contributed to research in topics: Solubility & Chemistry. The author has an hindex of 37, co-authored 261 publications. Previous affiliations of Keiji Yamamoto include Assiut University & Teikyo University.
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Papers
Incorporation of Salicylic Acid Molecules into the Intermolecular Spaces of γ-Cyclodextrin-Polypseudorotaxane
TL;DR: In this paper, salicylic acid (SA) was incorporated into polyethylene glycol (PEG)/γ-cyclodextrin (CD)-polypseudorotaxane structure by using powder X-ray diffraction measurements and 13C-solid state NMR spectroscopy.
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Importance of evaluating the consolidation of granules manufactured by high shear mixer.
TL;DR: It was concluded that evaluation of the granule consolidated state, such as the mean pore diameter, was important in order to assure the dissolution properties of drug products.
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Evaluation of amorphous ursodeoxycholic acid by thermal methods.
TL;DR: Although no significant difference was observed in X-ray diffraction patterns of amorphous UDCA prepared by the two methods, significant differences were recognized in DSC, IR and 13C-NMR, and the heat of solution indicated different values among the two samples.
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Characterization and quantitation of clarithromycin polymorphs by powder X-ray diffractometry and solid-state NMR spectroscopy.
TL;DR: Characterization of clarithromycin polymorph was performed by solid-state cross polarization and magic angle spinning (CP/MAS) 13C-NMR spectroscopy andsolid-state NMR was found to be a useful technique to determine the characteristics of the polymorphic forms.
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Differences in crystallization behavior between quenched and ground amorphous ursodeoxycholic acid.
TL;DR: The crystallisation of amorphous UDCA was related to the molecular state of disorder and peak shifts were observed in the NIR spectra at around 1450, 2100 nm, allowing differentiation between the ground and quenched samples.
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