Labdane dimers from Xylopia aromatica1Based on part of the Ph.D. thesis presented by DM to Universidade de São Paulo.1

Martins, Dirceu; Hamerski, Lidilhone; Alvarenga, Sandra A. V.; Roque, Nı́dia Franca

doi:10.1016/s0031-9422(99)00097-7

Cited by 36 publications

(16 citation statements)

References 8 publications

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“…6 The hydroalcoholic residue of the hexane extract of V. mollissima pericarps (2.5 g) was fractionated by silica gel column chromatography and eluted with hexane:EtOAc of increasing polarity, resulting in the isolation of grandisin (3, 13.8 mg). 7,8 The hexane residue of the EtOH extract from the arils (3.84 g) showed formation of crystals, which recrystallized in CH 2 Cl 2 afforded hydroxy-oxo-otobain (4, 11.0 mg). 9,10 The precipitate (555.0 mg) of the hexane extract V. mollissima arils with hot MeOH was submitted to column chromatography on silica gel and eluted with hexane:EtOAc of increasing polarity, yielding 67 fractions which were pooled into four groups (VM-A1 to VM-A4) after TLC analysis.…”

Section: Extraction and Isolationmentioning

confidence: 99%

“…This procedure yielded 17 fractions that were reduced to 5 fractions according their TLC profiles (VP-A1 to VP-A5). Fraction VP-A1 (479.0 mg) was submitted to preparative TLC, and eluted with 98:2, CHCl 3 :EtOAc to afford carinatin (6, 133.0 mg), carinatidin (7,48.0 mg), dihydrocarinatin (8,103.0 mg) and dihydrocarinatidin (9, 60.0 mg). 11 Fraction VP-A2 (159.0 mg), through preparative TLC (silica gel and 4:1 hexane:EtOAc), led to the isolation of dehydrodieugenol (10, 24.0 mg).…”

Section: Extraction and Isolationmentioning

confidence: 99%

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Biological activities of lignoids from Amazon Myristicaceae species: Virola michelii, V. mollissima, V. pavonis and Iryanthera juruensis

Morais¹,

Teixeira²,

Torres³

et al. 2009

J. Braz. Chem. Soc.

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O trabalho consiste na re-investigação dos frutos de Iryanthera juruensis e Virola pavonis e das folhas de V. michelii, bem como no estudo dos frutos de V. mollissima. A partir de I. juruensis foram isoladas uma neolignana ariltetralínica (1) e uma neolignana tetraidrofurânica (2), enquanto que de Virola pavonis foram isoladas neolignanas benzofurânicas (6-9), tetraidrofurânicas (2, 11-13, 17), bifenílica (10), diastereoisômeros de uma hidróxi-neolignana 8.O.4'(14-15) e outras. V. mollissima acumula a neolignana ariltetralônica 4 ou o seu derivado seco (5). As folhas de V. michelii apresentaram a ocorrência de lignanas furofurânicas (18)(19). Os lignóides 1 e 2 obtidos dos arilos de I. juruensis apresentaram atividade leishmanicida contra a forma promastigota de Leishmania amazonensis.This work revisits the fruits of Iryanthera juruensis and Virola pavonis and the leaves from V. michelii, as well as describing a study of the fruits of V. mollissima. In I. juruensis aryltetraline neolignan (1) and tetrahydrofuran neolignan (2), were found while from V. pavonis neolignans of benzofuran type (6-9), the tetrahydrofuran type (2, 11-13, 17) and the biphenyl type (10), in addition to diastereoisomers of the 8.O.4'-oxyneolignan type (14 and 15) and others were isolated. The V. mollissima accumulates the aryltetralone neolignan 4 and its seco derivative (5). The lignoids 1 and 2 obtained from I. juruensis arils possess antileishmanial activity against the promastigote form of Leishmania amazonensis.

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Section: Extraction and Isolationmentioning

confidence: 99%

Section: Extraction and Isolationmentioning

confidence: 99%

Biological activities of lignoids from Amazon Myristicaceae species: Virola michelii, V. mollissima, V. pavonis and Iryanthera juruensis

Morais¹,

Teixeira²,

Torres³

et al. 2009

J. Braz. Chem. Soc.

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“…The Pt films studied were prepared with thickness of 2, 22, 51 and 80 nm at T S ranging from 200 to 500 1C. The XRD measurements [18] show that high degree of crystallinity and preferred [1 0 0] texture are obtained for Pt films with $51 nm grown at 500 1C. For Pt films with 80 nm, we For FePt films grown on MgO with Pt buffer layer (Fig.…”

Section: Fept Filmsmentioning

confidence: 99%

Alternate monatomic layer sputter deposition of FCT (L10-type) ordered FePt and CoPt films

Martins

Fantini

Souza-Neto

et al. 2006

Journal of Magnetism and Magnetic Materials

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“…Previous works have not, to our knowledge, provided any evaluation of the temperature increase during isothermal DSC crystallization or analyzed its effect on the description of the overall crystallization kinetics. Part of this work was carried out previously, 4 but it is presented here with an additional detailed analysis of the effect of the temperature increase on the definition of the sample temperature corresponding to the half-crystallization time (t 50% ), together with a kinetic description of the nominally isothermal crystallization formulated as a nonisothermal process (particularly at low crystallization temperatures) with Nakamura's equation.…”

Section: Introductionmentioning

confidence: 99%

True sample temperatures in isothermal differential scanning calorimetry scans and their effect on the overall polymer crystallization kinetics

Martins

Pinto

2003

J of Applied Polymer Sci

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ABSTRACT:The true temperature of a sample during isothermal crystallization is higher than the recorded differential scanning calorimetry program temperature because of two combined effects: the thermal resistance of the sample, which is mainly dependent on the thickness of the sample, and the release of the heat of crystallization. This is especially true for a low crystallization temperature, at which the heat of crystallization is released within a relatively short time. Isothermal crystallization is treated here as a nonisothermal process, and the values of the parameters obtained with single-mechanism equations (Avrami and Nakamura's) used in their description are compared. The validity of the procedure used for evaluating the temperature increase of a sample is analyzed and discussed (i.e., the evaluation of the thermal resistance of a sample as a function of its thickness). Some isothermal crystallization data obtained at relatively high supercoolings may be affected by errors if temperature corrections are not carried out.

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Labdane dimers from Xylopia aromatica1Based on part of the Ph.D. thesis presented by DM to Universidade de São Paulo.1

Cited by 36 publications

References 8 publications

Biological activities of lignoids from Amazon Myristicaceae species: Virola michelii, V. mollissima, V. pavonis and Iryanthera juruensis

Biological activities of lignoids from Amazon Myristicaceae species: Virola michelii, V. mollissima, V. pavonis and Iryanthera juruensis

Alternate monatomic layer sputter deposition of FCT (L10-type) ordered FePt and CoPt films

True sample temperatures in isothermal differential scanning calorimetry scans and their effect on the overall polymer crystallization kinetics

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