JBCS

19:38, Sun Jul 23

Open Access/APCs

vol. 23, No. 2, 2012, p. 191-371

 

The Brazilian Genetic Heritage: Protect It or Use It Commercially?

The recent actions of the Brazilian Institute for the Environment and Renewable Natural Resources ‐ IBAMA, as part of the Operation New Directions (started in 2010), by notifying research institutions, pharmaceutical, cosmetic and agricultural companies, accused of biopiracy and investigated for presumed illegal collection of Brazilian biodiversity products, have led those segment companies to a standstill in that area.

(Read more at Editorial)


Cover Article
J. Braz. Chem. Soc. 2012, 23(2), 335-343

Systematic UPLC-ESI-MS/MS Study on the Occurrence of Staurosporine and Derivatives in Associated Marine Microorganisms from Eudistoma vannamei

Márcio A. Andréo; Paula C. Jimenez; Josy B. C. N. Siebra; Leticia V. Costa-Lotufo; Ricardo Vessecchi; Michael Niehues; João L. C. Lopes; Norberto P. Lopes

How to cite this article

Invertebrate marine organisms, such as the Brazilian endemic Ascidia Eudistoma vannamei, have become more frequently target of studies focusing on the discovery of new bioactive natural compounds. Several marine organisms are certainly capable to produce biologically active substances, though frequently associated microorganisms were proven as ultimately responsible for the biosynthesis of precursors or of the bioactive molecules themselves. In the case of Eudistoma vannamei the isolation and culture of associated microorganisms revealed an Actinobacteria whose extract exhibited highly significant cytotoxic activity against different cancer cell lines.

A systematic study by mass spectrometry in combination with theoretical calculations detected the bioactive alkaloid staurosporine in a Streptomyces species and therefore revealed this microorganism as potential source for other related compounds identified in Eudistoma vannamei. Details are discussed in the Article Systematic UPLC-ESI-MS/MS Study on the Occurrence of Staurosporine and Derivatives in Associated Marine Microorganisms from Eudistoma vannamei by Andréo et al. on page 335.

http://dx.doi.org/10.1590/S0103-50532012000200021

Published online: February 7, 2012

Editorial J. Braz. Chem. Soc. 2012, 23(2), 191-196

The Brazilian Genetic Heritage: Protect It or Use It Commercially?

Daniel Weingart Barreto

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http://dx.doi.org/10.1590/S0103-50532012000200001


Articles J. Braz. Chem. Soc. 2012, 23(2), 197-205

Determination of Pesticide Residues in Sugarcane Honey by QuEChERS and Liquid Chromatography

Maicon R. F. Sampaio; Débora Tomasini; Liziane V. Cardoso; Sergiane S. Caldas; Ednei G. Primel

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The continuous and indiscriminate use of pesticides facilitates its occurrence in sugarcane derivatives. This work describes a method for determination of pesticides belonging to different chemical classes in sugarcane honey employing the QuEChERS method for extraction and quantification by liquid chromatography

http://dx.doi.org/10.1590/S0103-50532012000200002

Published online: November 8, 2011

J. Braz. Chem. Soc. 2012, 23(2), 206-211

Biotic and Abiotic Stress-Induced Phenylpropanoids in Leaves of the Mango (Mangifera indica L., Anacardiaceae)

Rodolfo R. da Silva; Cláudio A. G. da Câmara; Argus V. Almeida; Clécio S. Ramos

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It was observed that mango leaves emit myristicin, dillapiole, eugenol and eugenol acetate phenylpropanoids as a response to abiotic and biotic stresses. This present investigation contributes to the discovery of new natural insecticides

http://dx.doi.org/10.1590/S0103-50532012000200003

Published online: November 17, 2011

J. Braz. Chem. Soc. 2012, 23(2), 212-219

Refining of Buriti Oil (Mauritia flexuosa) Originated from the Brazilian Cerrado: Physicochemical, Thermal-Oxidative and Nutritional Implications

Jailane de Souza Aquino; Débora C. N. de Pontes Pessoa; Kassandra de Lourdes G. V. Araújo; Poliana S. Epaminondas; Alexandre Ricardo P. Schuler; Antônio G. de Souza; Tânia Lúcia M. Stamford

How to cite this article

 

This figure shows the steps of the refining of buriti oil (Mauritia flexuosa)

http://dx.doi.org/10.1590/S0103-50532012000200004

Published online: November 17, 2011

J. Braz. Chem. Soc. 2012, 23(2), 220-227

Polymorphism Evaluation in Generic Tablets containing Mebendazole by Dissolution Tests

Sara B. Honorato; Silvia Farfan; Arnaldo Viana; Josué M. Filho; Gisela C. Camarão; Francisco V. Fechine; Maria E. A. Moraes; Manoel O. Moraes; Maribel Ferro; Viviana Dabbene; Silvia L. Cuffini; Alejandro P. Ayala

How to cite this article

 

This study shows that the low specificity of the USP (United States Pharmacopeia) dissolution conditions for the discrimination of the mebendazole polymorphs gives rise to the widespread different crystal forms in generic tablets. In addition, it was verified that polymorphs A and C exhibit different behaviors in the investigated dissolution media

http://dx.doi.org/10.1590/S0103-50532012000200005

Published online: November 22, 2011

J. Braz. Chem. Soc. 2012, 23(2), 228-235

Dichloroiodoisocyanuric Acid: A New Reagent for Regioselective Coiodination of Alkenes and Iodination of Activated Arenes

Rodrigo da Silva Ribeiro; Pierre M. Esteves; Marcio C. S. de Mattos

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Dichloroiodoisocyanuric acid was prepared in 93% and proved to be very efficient for electrophilic iodination of activated arenes and coiodination of alkene with oxygenated nucleophiles

http://dx.doi.org/10.1590/S0103-50532012000200006

Published online: November 22, 2011


J. Braz. Chem. Soc. 2012, 23(2), 236-240

Photocatalytic Degradation of 1,4-Benzoquinone in Aqueous ZnO Dispersions

Yadollah Abdollahi; Abdul H. Abdullah; Umar I. Gaya; Saeid Ahmadzadeh; Azmi Zakaria; Kamyar Shameli; Zulkarnain Zainal; Hossein Jahangirian; Nor Azah Yusof

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The present paper reports the UV-assisted degradation of 1,4-benzoquinone in ZnO suspensions. In the study, 1,4-benzoquinone photodegradation was independent of pH, the photoactivity of ZnO was maximum at 1.0 g L-1 concentration and particularly at 100 mg L-1 1,4-benzoquinone levels. Within pH 4-10 more than 80% of 1,4-benzoquinone can be removed

http://dx.doi.org/10.1590/S0103-50532012000200007

Published online: November 22, 2011

J. Braz. Chem. Soc. 2012, 23(2), 241-246

Impact of Some Natural Derivatives on the Oxidative Stability of Soybean Oil Based Biodiesel

Min Luo; Ren-Yu Zhang; Zhi Zheng; Jian-li Wang; Jian-Bing Ji

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This f igure indicates that some of the natural antioxidants can significantly improve the oxidation stability of soybean based biodiesel, even better than synthetic antioxidants

http://dx.doi.org/10.1590/S0103-50532012000200008

Published online: November 22, 2011

J. Braz. Chem. Soc. 2012, 23(2), 247-257

Evaluation of the Catalyzed Photo-Cold Vapour Generation for Determination of Mercury by AAS

Henryk Matusiewicz; Ewa Stanisz

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Nano-Ag particles loaded on TiO2 (Ag-TiO2), unmodified TiO2 and ZnO were used as catalysts for the UV-induced cold vapour generation with formic acid coupled to atomic absorption for determination of total mercury in analytical samples

http://dx.doi.org/10.1590/S0103-50532012000200009

Published online: November 24, 2011

J. Braz. Chem. Soc. 2012, 23(2), 258-266

Pd Complexes Based on Phosphine-Linked Cyclophosphazenes: Synthesis, Characterization and Application in Suzuki Coupling Reactions

Vanderlei I. de Paula; Cintia A. Sato; Regina Buffon

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Palladium complexes based on cyclophosphazene-based ligands were tested in Suzuki coupling reactions. Complex N3P3(O-C6H4-p-PCy2)6/Pd3(dba)proved to be robust (could be kept in solution, at room temperature, for at least one week) and could be used in low loadings, affording turnover numbers as high as ca. 17,500 for the coupling of 2-bromotoluene with chlorophenylboronic acid

http://dx.doi.org/10.1590/S0103-50532012000200010

Published online: November 29, 2011


J. Braz. Chem. Soc. 2012, 23(2), 267-272

Multivariate Optimization of Pressurized Solvent Extraction of Alkylphenols and Alkylphenol Ethoxylates from Biosolids

Adolfo Maricán; Inés Ahumada; Pablo Richter

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Quantitative extraction of alkylphenols (APs) and alkylphenol ethoxylates (APEs) from biosolids using pressurized solvent extraction (PSE) was optimized by central composite design, considering the variables: temperature, time and extraction solvent. After optimization, the following optimal values were obtained: 129 ºC, 38 min in 2 cycles and acetone as extraction solvent

http://dx.doi.org/10.1590/S0103-50532012000200011

Published online: November 29, 2011

J. Braz. Chem. Soc. 2012, 23(2), 273-279

Discrimination of Sugarcane according to Cultivar by 1H NMR and Chemometric Analyses

Elenilson G. Alves Filho; Lorena M. A. Silva; Rafael Choze; Luciano M. Lião; Neli K. Honda; Glaucia B. Alcantara

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Sugarcane leaves were analysed by 1H nuclear magnetic resonance spectroscopy and chemometrics. Different cultivars were discriminated by this methodology according to sugar content, especially sucrose and glucose

http://dx.doi.org/10.1590/S0103-50532012000200012

Published online: December 1, 2011

J. Braz. Chem. Soc. 2012, 23(2), 280-284

Total Synthesis of 1-Hydroxydehydroherbarin and Ascomycones A, B, Naphthoquinone Antibiotics

Wen-Kai Dong; Xiong Huang; Dong-Cheng Xu; Xin-Sheng Li; Jian-Wu Xie

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The first total synthesis of 1-hydroxydehydroherbarin and ascomycones A, B is reported. The biologically interesting ascomycones A, B were obtained in 18% overall yield starting from 3-chloro-2,5-dimethoxybenzaldehyde (10) as building block

http://dx.doi.org/10.1590/S0103-50532012000200013

Published online: December 1, 2011


J. Braz. Chem. Soc. 2012, 23(2), 285-293

Diastereoselective Synthesis of Substituted 2-Amino-1,3-propanediols from Morita-Baylis-Hillman Adducts

Paulo H. S. Paioti; Patrícia Rezende; Fernando Coelho

How to cite this article

 

A diastereoselective approach for the synthesis of 2-amino-1,3-propanediols from Morita-Baylis-Hillman is disclosed herein. The method is based on an ozonolysis reaction to provide 2-oxo-1,3- propanediol derivatives which were used in a reductive amination step

http://dx.doi.org/10.1590/S0103-50532012000200014

Published online: December 1, 2011


J. Braz. Chem. Soc. 2012, 23(2), 294-300

Influence of Tomato Components in the Quantification of Four Pesticides by Gas Chromatography

Gevany P. Pinho; Antônio A. Neves; Maria Eliana L. R. Queiroz; Flaviano O. Silvério; Deyse B. Marthe

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The matrix effect in gas chromatographic analysis is attributed to the presence of coextractives in the organic phase obtained in the extraction process. This work reveals that the internal standard method reduces but does not eliminate this effect

http://dx.doi.org/10.1590/S0103-50532012000200015

Published online: December 1, 2011


J. Braz. Chem. Soc. 2012, 23(2), 301-305

Furanoflavones and other Chemical Constituents of Lonchocarpus obtusos

Maria Gilvânia B. Cavalcante; Rochanne M. Silva; Paulo N. Bandeira; Hélcio S. dos Santos; Otília Deusdênia L. Pessoa; Raimundo Braz-Filho; Maria Rose Jane R. Albuquerque

How to cite this article

 

Two new furanoflavonoids (5-hydroxy-2''-isopropenyl-3-methoxyfurane-(2",3":7,8)-flavone and 5-hydroxy-2''-(1-hydroxy-1-methylethyl)-3-methoxyfurane-(2",3":7,8)-flavone) together with twelve known flavonoids and one triterpene were isolated from Lonchocarpus obtusos

http://dx.doi.org/10.1590/S0103-50532012000200016

Published online: December 6, 2011


J. Braz. Chem. Soc. 2012, 23(2), 306-314

Comparison between GC-MS-SIM and GC-ECD for the Determination of Residues of Organochlorine and Organophosphorus Pesticides in Brazilian Citrus Essential Oils

Andréa A. R. Alves; Michelle J. C. Rezende; Ana M. C. Hovell; Humberto R. Bizzo; Ana Carolina L. Oliveira; Silvana V. Rodrigues; Claudia M. Rezende

How to cite this article

 

Two gas chromatographic methods (gas chromatography-mass spectrometry in selective ion monitoring mode (GC-MS-SIM) and gas chromatography-electron capture detector (GC-ECD) were developed, validated and compared for the determination of residues of organochlorine and organophosphoruspesticides in Brazilian citrus essential oils (EOs). Solid phase extraction (SPE) was used for pre-concentration of pesticides. The analysis of fifteen Brazilian commercial EOs showed that 40% (six samples) presented contamination above the allowed maximum residue limit (MRL)

http://dx.doi.org/10.1590/S0103-50532012000200017

Published online: December 6, 2011

J. Braz. Chem. Soc. 2012, 23(2), 315-321

Characterization of Paracetamol Binding with Normal and Glycated Human Serum Albumin Assayed by a New Electrochemical Method

Parandis Daneshegar; Ali Akbar Moosavi-Movahedi; Parviz Norouzi; Mohammad Reza Ganjali; Mohammad Farhadi; Nader Sheibani

How to cite this article

 

In the present study the interactions between paracetamol (PC) and human serum albumin, in non-glycated (HSA) and glycated form (GHSA), were investigated using continuous cyclic voltammetry in acetate buffer pH 7.4. at the figure the cyclic voltamogram of PC alone(a) after adding the protein has been shown (b,c)

http://dx.doi.org/10.1590/S0103-50532012000200018

Published online: December 13, 2011

J. Braz. Chem. Soc. 2012, 23(2), 322-327

A Catalytic Kinetic Spectrophotometric Determination of Organophosphorus Pesticides in Vegetable Samples

Neetu Tiwari; Anupama Asthana

How to cite this article

 

A sensitive kinetic method based on catalytic effect of organophosphorus pesticides malathion(A), dimethoate(B) and phorate(C)) on the oxidation of LCV (leuco crystal violet) by potassium iodate in hydrochloric acid medium to give a violet colored dye. The catalytic activity is mainly exhibited by thiophosphoryl compounds and depends on the nature of the P=S bond

http://dx.doi.org/10.1590/S0103-50532012000200019

Published online: December 13, 2011

J. Braz. Chem. Soc. 2012, 23(2), 328-334

Characterisation of Electrodeposited and Heat-Treated Ni-Mo-P Coatings

Régis L. Melo; Paulo N. S. Casciano; Adriana N. Correia; Pedro de Lima-Neto

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The graphical abstract shows the influence of the P content on hardness and on the corrosion resistance of the electrodeposited Ni-Mo-P. The results show that the addition of P is beneficial for the hardness and corrosion resistance properties of the Ni-Mo-based coatings and the Ni78Mo10P12 sample presented the best hardness and corrosion-resistance properties

http://dx.doi.org/10.1590/S0103-50532012000200020

Published online: December 15, 2011

J. Braz. Chem. Soc. 2012, 23(2), 335-343

Systematic UPLC-ESI-MS/MS Study on the Occurrence of Staurosporine and Derivatives in Associated Marine Microorganisms from Eudistoma vannamei

Márcio A. Andréo; Paula C. Jimenez; Josy B. C. N. Siebra; Leticia V. Costa-Lotufo; Ricardo Vessecchi; Michael Niehues; João L. C. Lopes; Norberto P. Lopes

How to cite this article

 

Marine microorganisms from Eudistoma vannamei presenting Streptomyces sp. able to generate staurosporine with significant cytotoxic activity against human cancer lines

http://dx.doi.org/10.1590/S0103-50532012000200021

Published online: February 7, 2012


Short Reports J. Braz. Chem. Soc. 2012, 23(2), 344-348

Synthesis of the C1-C9 Fragment of the Potent Antitumor Agent Dictyostatin

Luiz C. Dias; Danilo P. Sant' Ana; Ygor W. Vieira; Caroline C. S. Gonçalves; Dimas J. P. Lima

How to cite this article

 

A short and efficient approach to the C1-C9 fragment of the potent antitumor agent dictyostatin is described

http://dx.doi.org/10.1590/S0103-50532012000200022

Published online: November 29, 2011


J. Braz. Chem. Soc. 2012, 23(2), 349-354

Lycopodium Alkaloids from Palhinhaea cernua

Fu-Wei Zhao; Qian-Yun Sun; Fu-Mei Yang; Ji-Feng Luo; Guang-Wan Hu; Fang Liu; Yue-Hu Wang; Chun-Lin Long

How to cite this article

 

Two new Lycopodium alkaloids, acetyllycoserramine M and palcermine A, were isolated from Palhinhaea cernua L. Their structures were elucidated by spectroscopic methods and single-crystal X-ray diffraction analyses

http://dx.doi.org/10.1590/S0103-50532012000200023

Published online: December 1, 2011


J. Braz. Chem. Soc. 2012, 23(2), 355-360

Antiprotozoal Alkaloids from Psychotria prunifolia (Kunth) Steyerm

Lucilia Kato; Cecília M. A. de Oliveira; Emiret O. Faria; Laryssa C. Ribeiro; Brenda G. Carvalho; Cleuza C. da Silva; Ivânia T. A. Schuquel; Silvana M. O. Santin; Celso V. Nakamura; Elisandra A. Britta; Nathielle Miranda; Amadeu H. Iglesias; Piero G. Delprete

How to cite this article

 

Two new alkaloids were isolated from P. prunifolia besides the known alkaloids. Two known compounds exhibited in vitro inhibitory activity against Leishmania amazonensis with IC50 values of 16.0 and 40.7 μgg per mL

http://dx.doi.org/10.1590/S0103-50532012000200024

Published online: December 6, 2011


J. Braz. Chem. Soc. 2012, 23(2), 361-366

Caavuranamide, a Novel Steroidal Alkaloid from the Ripe Fruits of Solanum caavurana Vell. (Solanaceae)

Nelissa Pacheco Vaz; Emmanoel V. Costa; Érica L. Santos; Sandra Bos Mikich; Francisco A. Marques; Raquel M. Braga; Camila Delarmelina; Marta C. T. Duarte; Ana Lúcia T. G. Ruiz; Vanessa H. S. Souza; João E. de Carvalho; Beatriz H. L. N. Sales Maia

How to cite this article

 

Solanum steroidal alkaloids occur almost exclusively with 3β-OH and are commonly found in its glycosylated form. On the other hand, there is only one report of a 3β-N-formyl substituent with a solanidane-type skeleton. Caavuranamide (from S. caavurana Vell.) is the second report of an N-formyl steroidal alkaloid in this genus, and the first with a spirosolane-type skeleton

http://dx.doi.org/10.1590/S0103-50532012000200025

Published online: December 13, 2011


J. Braz. Chem. Soc. 2012, 23(2), 367-371

Impact of Chemical Oxidation on Brazilian Soils

Leandro A. da Silva; Silvio C. G. Teixeira; Daniel V. Pérez; Mônica R. da C. Marques

How to cite this article

 

Clay soils have been degraded after treatment by Fenton's reagent, decreasing its cation exchange capacity (CEC), which may cause long-term soil infertility because of reduced capacity to retain water and nutrients

http://dx.doi.org/10.1590/S0103-50532012000200026

Published online: December 15, 2011

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
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