## Abstract T1 and T2 relaxation times of agar phantoms containing L‐dopa melanin and Fe^3+^ were measured under MRI conditions. Fe^3+^ shortened T1 and T2 relaxation times. Melanin influenced relaxation times only in the presence of Fe^3+^; thus, contrast in MR images of the basal ganglia may depe
✦ LIBER ✦
Stoichiometry of interaction between soluble (—)-dopa melanin and enantiomers of ephedrine by NMR spectroscopy
✍ Scribed by M.M. Salazar-Bookaman; J.W. Fowble; P.N. Patil
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 417 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0899-0042
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## Abstract To prevent the precipitation reaction between glycyrrhizin (**1**) and berberine (**3**) in the decoctions of __Glycyrrhiza__/__Coptis__ rhizome or __Glycyrrhiza__/__Phellodendron__ bark, the presence of cyclodextrin (CD) in the mixture was proven to be effective. The preventing effect