## Abstract The highโfield ^27^Al NMR spectrum of aqueous tea extract contained two narrow resonances at 9.85 and 16.15 ppm. The spectra of aluminium chelates with a number of model ligands (catechol, pyrogallol, catechin, kojic acid, protocatechuic acid, ascorbic acid and salicylic acid) containin
Identification of aluminium forms in tea leaves by 27Al NMR
โ Scribed by Tadahiro Nagata; Masahito Hayatsu; Nobuo Kosuge
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 335 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0031-9422
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Al 3Q MAS NMR spectroscopy has been applied to study small amount of pentacoordinated Al emerges. The majority of the signal, however, arises from distorted tetrahedral Al. the coordination state of the species giving the 30 ppm Al NMR signal in the 27 Al MAS NMR spectrum of activated A two-step cal
## Abstract The reactions of Al^3+^ ion with glycine, picolinic acid, 1,2โpropylenediaminetetraacetic acid and triethylenetetraโminehexaacetic acid (H~p~L) were studied by potentiometric and ^27^Al NMR methods, and the complex species in solution at different pH values were identified. Acidic hydro
## Hgh -resolutton 27Al NhlR spectra of polycrystalhne alumrnntes have been studled at 70 4 hfHz hlaglc-angle spummg was used to reduce quadrupole effects and dlpolar mtenctlon. The isotropic \*'Al chenuul shrfts depend mamly on the AI-O coordmatlon For Al-O tetrahedra stufts of 55 to 80 ppm were