Characterization of fresh and aged natural ingredients used in historical ointments by molecular spectroscopic techniques: IR,Raman and fluorescence |
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Authors: | L Brambilla C Riedo C Baraldi A Nevin M C Gamberini C D’Andrea O Chiantore S Goidanich L Toniolo |
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Institution: | (1) Department CMIC, Politecnico di Milano, via Mancinelli 7, 20133 Milano, Italy;(2) Department of IPM Chemistry and NIS-Centre of Excellence, University of Turin, 10124 Turin, Italy;(3) Department of Pharmaceutical Sciences, Institute of Pharmacy, University of Modena and Reggio Emilia, via G. Campi 183, 41125 Modena, Italy;(4) Department of Physics, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy |
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Abstract: | Natural organic materials used to prepare pharmaceutical mixtures including ointments and balsams have been characterized
by a combined non-destructive spectroscopic analytical approach. Three classes of materials which include vegetable oils (olive,
almond and palm tree), gums (Arabic and Tragacanth) and beeswax are considered in this study according to their widespread
use reported in ancient recipes. Micro-FTIR, micro-Raman and fluorescence spectroscopies have been applied to fresh and mildly
thermally aged samples. Vibrational characterization of these organic compounds is reported together with tabulated frequencies,
highlighting all spectral features and changes in spectra which occur following artificial aging. Synchronous fluorescence
spectroscopy has been shown to be particularly useful for the assessment of changes in oils after aging; spectral difference
between Tragacanth and Arabic gum could be due to variations in origin and processing of raw materials. Analysis of these
materials using non-destructive spectroscopic techniques provided important analytical information which could be used to
guide further study. |
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