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Pyrrolizidine Alkaloid Profiles of the Senecio Cineraria Group (Asteraceae) Rosa Tundisa,*, Monica R

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Pyrrolizidine Alkaloid Profiles of the Senecio Cineraria Group (Asteraceae) Rosa Tundisa,*, Monica R Pyrrolizidine Alkaloid Profiles of the Senecio cineraria Group (Asteraceae) Rosa Tundisa,*, Monica R. Loizzoa, Giancarlo A. Stattia, Nicodemo G. Passalacquab, Lorenzo Peruzzib, and Francesco Menichinia a Department of Pharmaceutical Sciences, University of Calabria, I-87036 Arcavacata di Rende, CS, Italy. Fax: +39984493298. E-mail: [email protected] b Natural History Museum of Calabria and Botanic Garden, University of Calabria, I-87036 Arcavacata di Rende, CS, Italy * Author for correspondence and reprint requests Z. Naturforsch. 62c, 467Ð472 (2007); received July 7/September 13, 2006 Alkaloid profiles of five Senecio species (Asteraceae), including S. ambiguus subsp. ambi- guus, S. ambiguus subsp. nebrodensis, S. gibbosus subsp. bicolor, S. gibbosus subsp. gibbosus, and S. gibbosus subsp. cineraria, were studied. Eleven pyrrolizidine alkaloids were identified and their content was evaluated by GLC-MS and GLC analysis. Otosenine and florosenine were found to be the major alkaloids in all studied species. It is interesting that only S. ambi- guus subsp. nebrodensis was characterized by a high content of the alkaloids jacobine, jaco- line, jaconine, and jacozine. Key words: Senecio cineraria Group, Pyrrolizidine Alkaloids, GLC-MS Introduction defence barrier but are able to recruit PAs from their host plant and utilize them for their own de- Pyrrolizidine alkaloids (PAs) encompass a di- fence against predators. These insects, which be- verse group of some 350 structures that are scat- long to unrelated taxa such as Lepidoptera, Cole- tered among angiosperm species. The most promi- optera and Orthoptera, developed efficient nent occurrences are the genera Senecio and morphological and biochemical adaptations to Eupatorium (Asteraceae), several genera of the safely handle toxic PAs. In certain arctiid moths, Boraginaceae, the genus Crotalaria (Fabaceae) PAs even greatly influence the mating behavior. and certain orchids such as Phalaenopsis. Reliable Adult males signal females their alkaloid load by occurrences, sometimes only in single species, are close-distance pheromones made from PAs. Fe- documented for other families such as Apocyna- males preferentially accept males with a high load ceae, Celastraceae, Ranunculaceae, Proteaceae of PAs for mating since they may receive more and Convolvulaceae (Hartmann, 1999; Hartmann than a third of their PAs from males. These PAs and Ober, 2000). PAs are ester alkaloids consisting of a necine base moiety, esterified with a necic of parental origin are utilized for protection of the acid. They may occur as monoesters, openchain eggs against predators (Hartmann, 1999). Plants diesters, or macrocyclic diesters. In all Senecio spe- and adapted insects maintain PAs in the state of cies senecionine N-oxide was identified as the pri- the non-toxic N-oxides which are easily converted mary product of biosynthesis. It is synthesized in into the toxic tertiary alkaloid (free base) in the the roots and translocated into the shoots, where gut of an unadapted predator. In conclusion, PAs it is transformed into the species-specific PAs represent a complex, but effective plant defence (Pelser et al., 2005). Senecionine was proved to be system successfully adopted by specialized insects incorporated into: (i) simple retronecine esters as in the course of their evolutionary adaptation to seneciphylline; (ii) epoxides of retronecine esters PA-containing plants. Pyrrolizidine alkaloids are as jacobine including jaconine, its product of chlo- considered also to be important secondary me- rolysis, and jacozine; and (iii) epoxides of otone- tabolites largely on account of their biological ac- cine esters as otosenine and florosenine. PAs are tivities including acute ones. part of the plant’s constitutive defence against in- Although pyrrolizidine alkaloids are known for sect herbivores. However, since insects coevolved their hepatotoxicity, mutagenicity carcinogenicity, with plants, there also exist a number of insect spe- and teratogenicity (Green and Christie, 1961; Hi- cies that have not only learned to cope with the rono et al., 1978, 1979), biological activities of 0939Ð5075/2007/0700Ð0467 $ 06.00 ” 2007 Verlag der Zeitschrift für Naturforschung, Tübingen · http://www.znaturforsch.com · D 468 R. Tundis et al. · Pyrrolizidine Alkaloid Profiles some Senecio species have been reported (Kovach Alkaloid extraction et al., 1979; Schmeller et al., 1997; El-Shazly et al., Air-dried aerial parts of each species were pow- 2002; Toma et al., 2004; Tundis et al., 2005a; Loizzo dered and exhaustively extracted with methanol et al., 2006). (3 ¥ 5 l) at room temperature. Combined metha- Senecio is the largest and complex genus of the nol solutions were concentrated under reduced Asteraceae and more than 1500 species have been pressure and dried. The residue was suspended in reported (Nordestam, 1977). In the Italian flora 200 ml of distilled water, acidified with 2.5% sul- the Senecio genus is represented by 52 specific or phuric acid, then stirred overnight at room tem- infra-specific taxonomic units (Conti et al., 2005); perature with Zn powder to reduce native or arti- about 26% of these units are endemic. In order to ficial PA N-oxides. Excess Zn was removed by continue our chemical studies of the genus Senecio filtration. The aqueous acidic solution was filtered (Tundis et al., 2005b) in the present work we have and basified (NH4OH to pH 10), then extracted investigated the qualitative and quantitative alka- with chloroform until no more alkaloids could be loidal pattern of members of the Senecio cineraria detected in the aqueous phase (TLC; silica gel; group, including S. ambiguus (Biv.) DC. subsp. am- eluent CH2Cl2/MeOH/NH4OH 85:14:1; detection biguus (Biv.) DC., S. ambiguus (Biv.) DC. subsp. by Dragendorff’s reagent). The organic portions nebrodensis (Guss.) Peruzzi & N. G. Passal., S. gib- were combined, dried over anhydrous sodium sul- bosus (Guss.) DC. subsp. bicolor (Willd.) Peruzzi, phate and the solvent evaporated to dryness to ob- N. G. Passal. & Soldano, S. gibbosus (Guss.) DC. tain the alkaloid extracts (Table II). subsp. gibbosus, and S. gibbosus (Guss.) DC. subsp. cineraria (DC.) Peruzzi, N. G. Passal. & GLC-MS analysis Soldano, by sensitive phytochemical methods (GLC, GLC-MS and NMR). Reviewing the cur- In order to determine the composition of the rent literature PAs were previously identified in alkaloid extracts analyses were carried out using a S. cineraria and S. ambiguus (El-Shazly et al., 2002; gas chromatograph system (Hewlett-Packard Co. Pelser et al., 2005); no information could be ob- model 6890) with a fused capillary column (30 m tained concerning the alkaloid content of S. ambi- length; 0.25 mm i. d.; 0.25 μm film thickness; static guus subsp. nebrodensis, S. gibbosus subsp. bicolor, phase methylsilicone SE-30) directly coupled to a and S. gibbosus subsp. gibbosus. selective mass detector (Hewlett Packard 5973). Electron impact ionization was carried out at an Materials and Methods energy of 70 eV. Helium was used as carrier gas. Injector and detector were maintained at 250 ∞C Plant material and 280 ∞C, respectively. The analytical conditions Plants were identified and collected from their were as follows: oven temperature was 5 min iso- natural habitats in Southern and Central Italy by thermal at 60 ∞C, then 60Ð280 ∞C at a rate of Dr. N. G. Passalacqua and Dr. L. Peruzzi of the 16 ∞C/min, then held isothermal for 10 min. The Natural History Museum of Calabria and Botani- mass range from 50 to 550 amu was scanned at a cal Garden of Calabria University, Italy. Plants rate of 2.9 scans/s. For analysis, alkaloid fractions were preserved as air-dried material and stored at were dissolved in dichloromethane (ca. 1 mg/ml) room temperature until use. Voucher specimens and aliquots (1 μl) were directly injected. Identifi- (Table I) were deposited in the Herbarium, Uni- cation of the alkaloids was based on the compari- versity of Calabria (CLU), Italy. son of the mass spectral data on computer match- Table I. Sources of the studied Senecio species and their voucher specimen numbers. Species Subspecies Voucher specimen number Location of collection S. ambiguus ambiguus 7744Ð7746 Nicolosi, Etna (Catania, Italy) nebrodensis 7747Ð7748 Serre di Quacella (Palermo, Italy) S. gibbosus gibbosus 4451 Acqualandrone (Messina, Italy) cineraria 4455 Castiglioncello (Livorno, Italy) bicolor 4454 Cefalu` (Palermo, Italy) R. Tundis et al. · Pyrrolizidine Alkaloid Profiles 469 Table II. Content and yield (% relative to dried plant material) of methanolic and alkaloid extracts of Senecio cineraria group species. Species Subspecies Plant material Methanolic extract Alkaloid extract [g] Content [g] Yield (%) ð S.D.a Content [g] Yield (%) ð S.D.a S. ambiguus ambiguus 500 62.50 12.50 ð 0.013 1.62 0.32 ð 0.010 nebrodensis 130 11.47 8.83 ð 0.025 0.16 0.13 ð 0.005 S. gibbosus gibbosus 150 20.77 13.85 ð 0.017 0.27 0.18 ð 0.004 cineraria 150 12.17 8.12 ð 0.032 0.25 0.16 ð 0.003 bicolor 500 44.03 8.81 ð 0.024 1.02 0.20 ð 0.003 a S.D., Standard deviation (n = 3). ing against Wiley 138 and NIST 98 (Table III). alkaloid extract of S. gibbosus subsp. bicolor. Oto- Identification was confirmed by determination of senine (4, 912 mg) and florosenine (5, 322.4 mg) the retention index; the modified Van Den Dool were also isolated from an alkaloid extract of and Kratz formula was used to calculate the reten- S. ambiguus subsp. ambiguus as major compo- tion index by interpolation between bracketing nents. C9ÐC31 n-alkanes (Tranchant, 1995). NMR measurements Capillary GLC analysis Structure elucidation was carried out using spec- A Shimadzu model gc 17 gas chromatograph troscopic methods employing a Bruker (Milano, equipped with a FID detector and a capillary col- Italy) model AC 300 spectrophotometer operating umn (30 m length; 0.25 mm i. d.; 0.25 μm film at 300 MHz (1H NMR) and 75 MHz (13C NMR). thickness; static phase methylsilicone SE-30) and Spectra were recorded in DMSO-D6 (compound controlled by Borwin software was employed.
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