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Start Over Author "Massayoshi Yoshida" Publisher sociedade brasileira de quimica
4 results on '"Massayoshi Yoshida"'

1. Aspectos estruturais de algumas neolignanas hidrobenzofurânicas

Author

Massayoshi Yoshida

Subjects
neolignans, hydrobenzofuran skeleton, Lauraceae, Chemistry, QD1-999
Abstract

The neolignans are defined as dimers of allylphenol and propenylphenol between itself or crossed, whose bond does not occur by the 8-8' carbons like lignans. This review centered on stereochemical aspects of the hydrobenzofuran type, a widespread skeleton among neolignans. The chemical structures established based on spectrometric data are registered in the literature. The absolute configurations reported previously were determined by chiroptical techniques. Some chemical transformations with neolignans, performed in previous studies, afforded products which are accumulated in other vegetal species and contributed to assign the unknown stereochemistry of these natural compounds. Possible biosynthetic pathways are also proposed.

Published
2012
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2. Aromatic compounds from three Brazilian Lauraceae species

Author

Andrea Nastri de Luca Batista, João Marcos Batista Junior, Silvia Noelí López, Maysa Furlan, Alberto José Cavalheiro, Dulce Helena Siqueira Silva, Vanderlan da Silva Bolzani, Sergio Massayoshi Nunomura, and Massayoshi Yoshida

Subjects
Lauraceae, Ocotea, Persea, Chemistry, QD1-999
Abstract

Phytochemical investigations on three Brazilian Lauraceae species from the Cerrado region of São Paulo State, Ocotea corymbosa (Meins) Mez., O. elegans Mez. and Persea pyrifolia Nees & Mart. ex Nees resulted in the isolation of flavonoids, an ester of the 4-O-E-caffeoylquinic acid, an aromatic sesquiterpene besides furofuran lignans. This is the first chemical study on the leaves of Ocotea elegans and O. corymbosa as well as the first report of non-volatile compounds from Persea pyrifolia.

Published
2010
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3. Aromatic compounds from three Brazilian Lauraceae species

Author

Vanderlan da Silva Bolzani, João Marcos Batista Junior, Alberto José Cavalheiro, Sergio Massayoshi Nunomura, Maysa Furlan, Massayoshi Yoshida, Dulce Helena Siqueira Silva, Silvia N. Lopez, Andrea N. L. Batista, Universidade Estadual Paulista (Unesp), Instituto Nacional de Pesquisas da Amazônia (INPA), and Centro de Biotecnologia da Amazônia (CBA)

Subjects
Persea, biology, General Chemistry, Lauraceae, Quinic acid, biology.organism_classification, Sesquiterpene, lcsh:Chemistry, chemistry.chemical_compound, Phytochemical, chemistry, Ocotea, lcsh:QD1-999, Botany, Persea pyrifolia, Ocotea corymbosa
Abstract

Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:48:49Z No. of bitstreams: 1 S0100-40422010000200017.pdf: 242505 bytes, checksum: 178d6611bc19b0615dbbe4e4a7a24d81 (MD5) Made available in DSpace on 2013-08-22T18:48:49Z (GMT). No. of bitstreams: 1 S0100-40422010000200017.pdf: 242505 bytes, checksum: 178d6611bc19b0615dbbe4e4a7a24d81 (MD5) Previous issue date: 2010-01-01 Made available in DSpace on 2013-09-30T19:10:48Z (GMT). No. of bitstreams: 2 S0100-40422010000200017.pdf: 242505 bytes, checksum: 178d6611bc19b0615dbbe4e4a7a24d81 (MD5) S0100-40422010000200017.pdf.txt: 22081 bytes, checksum: 5051bd1ddcb22e79dd8517f88ca4eb98 (MD5) Previous issue date: 2010-01-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T14:21:21Z No. of bitstreams: 2 S0100-40422010000200017.pdf: 242505 bytes, checksum: 178d6611bc19b0615dbbe4e4a7a24d81 (MD5) S0100-40422010000200017.pdf.txt: 22081 bytes, checksum: 5051bd1ddcb22e79dd8517f88ca4eb98 (MD5) Made available in DSpace on 2014-05-20T14:21:21Z (GMT). No. of bitstreams: 2 S0100-40422010000200017.pdf: 242505 bytes, checksum: 178d6611bc19b0615dbbe4e4a7a24d81 (MD5) S0100-40422010000200017.pdf.txt: 22081 bytes, checksum: 5051bd1ddcb22e79dd8517f88ca4eb98 (MD5) Previous issue date: 2010-01-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Phytochemical investigations on three Brazilian Lauraceae species from the Cerrado region of São Paulo State, Ocotea corymbosa (Meins) Mez., O. elegans Mez. and Persea pyrifolia Nees & Mart. ex Nees resulted in the isolation of flavonoids, an ester of the 4-O-E-caffeoylquinic acid, an aromatic sesquiterpene besides furofuran lignans. This is the first chemical study on the leaves of Ocotea elegans and O. corymbosa as well as the first report of non-volatile compounds from Persea pyrifolia. Universidade Estadual Paulista Júlio de Mesquita Filho Instituto de Química Departamento de Química Orgânica Instituto Nacional de Pesquisas da Amazônia Divisão de Química de Produtos Naturais Departamento de Produtos Naturais Centro de Biotecnologia da Amazônia Universidade Estadual Paulista Júlio de Mesquita Filho Instituto de Química Departamento de Química Orgânica

Published
2010

4. A new neolignan and antioxidant phenols from Nectandra grandiflora

Author

Alan Bezerra Ribeiro, Vanderlan da Silva Bolzani, Massayoshi Yoshida, Dulce Helena Siqueira Silva, Marcos N. Eberlin, Leonardo S. Santos, Universidade Estadual Paulista (Unesp), Universidade de São Paulo (USP), Instituto de Pesquisas da Amazônia, and Universidade Estadual de Campinas (UNICAMP)

Subjects
chemistry.chemical_classification, Antioxidant, antioxidant, Traditional medicine, Chemistry, DPPH, medicine.medical_treatment, Flavonoid, Glycoside, neolignan, General Chemistry, radical scavenging activity, Protocatechuic acid, Rutin, chemistry.chemical_compound, Lauraceae, medicine, Organic chemistry, flavonoid, Phenols, Afzelin, Nectandra grandiflora
Abstract

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:21:19Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:29:29Z : No. of bitstreams: 1 2-s2.0-23744439433.pdf: 147891 bytes, checksum: 4d0a97a4d06dcf1d552dddb27ce7dcc2 (MD5) Made available in DSpace on 2014-05-27T11:21:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-05-01 The EtOH crude extract from the leaves of Nectandra grandiflora collected in the Atlantic Forest, Brazil, showed antioxidant activity towards β-carotene in a TLC assay. The bioassay-guided fractionation led to the isolation of protocatechuic acid and two flavonol glycosides: afzelin and quercetrin, which showed free radical scavenging activity towards DPPH (ΔA 32, 16 and 73% at 50 μmol L-1) and were compared to commercial antioxidants rutin (81% at 50 μmol L-1) and BHT (9% at 50 μmol L-1), used as standard compounds. Additionally, three inactive neolignans, including the new bicycle[3.2.1]octane neolignan 2′-oxo-piperol B were obtained and characterized by spectrometric methods. ©2005 Sociedade Brasileira de Química. Instituto de Química Universidade Estadual Paulista, CP 355, 14801-900 Araraquara - SP Instituto de Química Universidade de São Paulo, CP 26077, 05513-970 São Paulo - SP Instituto de Pesquisas da Amazônia, CP 476, 69083-000 Manaus - AM Instituto de Química Universidade Estadual de Campinas, CP 6154, 13084-971 Campinas - SP Instituto de Química Universidade Estadual Paulista, CP 355, 14801-900 Araraquara - SP

Published
2005

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