AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA PHYSICA - Ediţia nr.1 din 2004 | |||||||
Articol: |
PH DEPENDENCE OF THE FREE AND ADSORBED PAPAVERINE MOLECULAR SPECIES. VIBRATIONAL APPROACH. Autori: N. LEOPOLD, SIMONA CINTĂ PÂNZARU, M. BAIA, C. LEHENE, O. COZAR, WOLFGANG KIEFER. |
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Rezumat: The Raman spectra of papaverine aqueous solutions at acid pH values, as well as SERS spectra of papaverine adsorbed to colloidal silver surfaces at different acid and basic pH values were recorded and the assignments of papaverine vibrational modes were accomplished on the basis of density functional theory (DFT) calculations. The pH dependence Raman study is possible in the pH range under 6.5, for upper values the solubility being dramatically diminished. The pH dependence SERS spectra of papaverine reveals the chemisorption of the protonated and the neutral papaverine molecules to colloidal silver particles, as well as the coexistence of both molecular species adsorbed to the silver surface. The orientations to the silver surface of the two molecular species were discussed. | |||||||