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PubMed1992

[The structure identification of pyridinemono terpene isocantleyine].

Siphonostegia chinensis Benth. as a traditional Chinese medicine "liujinu" has been used for centuries in China, but up to date little has been reported about its chemistry. Now, four compounds have been isolated from the aerial parts of this genus. On the basis of spectroscopic analysis (UV, IR, MS, 1HNMR, 13CNMR and 2D-NMR) and chemical evidences, compound I was shown to be a new pyridinemonoterpene alkaloid which is a stereoisomer of the known compound cantleyine, and named isocantleyine. Its structure was determined as 5H-2-pyridine-4-carboxylic acid, 6,7-dihydro-6-hydroxy-7-methyl-methyl ester. Compound III was identified as the known compound loliolide. The other two (II and IV) are still under investigation. This paper deals mainly with the structure identification of compound I.

Drugs, Chinese Herbal↗
PubMed2003

Characterisation of fresh and aged terpenic resins by micro-FTIR and GC-MS analyses of varnishes in XVI-XVII centuries paintings.

Resinous materials, generally added to drying oils, were often employed as final protective films in paintings, both in tempera and oil techniques. Most of the resins used in fine arts come from exudates of plants. Natural resins are mainly composed by terpenoids. Among these resins, dammar, rosin, mastic, elemi gum, Venice turpentine were frequently employed in easel paintings. The aim of this work is the identification of natural resins in samples collected from works of art. In this paper we propose to use micro-FTIR spectrometry as a preliminary and non destructive technique to detect the presence of resinous materials in microsamples collected from paintings, followed by GC-MS analyses to obtain a precise identification of the resin. To reach this aim commercial resins, employed as standard, were analysed previously by micro-FTIR spectrometry and then analysed by GC-MS chromatography, searching characteristic chemical compounds used as "markers" of resins. The results obtained on standards allowed us to successfully analyse samples collected from two works of art: the "Portrait of a Young Gentleman", by Lorenzo Lotto (XVI century), and the "Madonna with the Infant Jesus and Saints": by Carlo Maratta (XVII secolo).

Art↗