Vitor Sueth-Santiago; Gustavo Peron Mendes-Silva; Débora Decoté-Ricardo; Marco Edilson Freire de Lima
Curcumin, isolated from the dried rhizomes of Curcuma longa (Zingiberaceae), is a golden colored derivative present in turmeric. Since its structural elucidation, several studies have been published on the biological activities exhibited by curcumin, particularly its chemotherapeutic properties.
Seyed Mehdi Sajjadi; Mohammad Haghighi; Farhad Rahmani
Effect of ZrO2 precursor on product yield at different temperatures.
Ghodsi Mohammadi Ziarani; Masoumeh Azizi; Parvin Hajiabbasi; Alireza Badiei
The Biginelli-type reaction between various aldehydes, acetophenones and urea in the presence of sulfonic acid functionalized silica (SBA-Pr-SO3H) under solvent-free conditions produced 4,6-diarylpyrimidin-2(1H)-ones derivatives at good yields.
Kassia dos Santos; Heloisa N. da Motta; Erick Amaral Campos; Joseane V. Gulmine; Marilda Munaro
This work identified the inefficiency in the analytical methods presented in standards ABNT NBR 13882 and IEC 61619 in the insulating oil analysis, and highlights potential failures that generated discrepancies on quantification of polychlorinated biphenyls (PCBs).
Giovanni B. Paschoal; Carmen M. O. Muller; Gizilene M. Carvalho; Cesar A. Tischer; Suzana Mali
Raw oat hulls were bleached with peracetic acid and then submitted to acid hydrolysis resulting in nanofibrillated cellulose, which showed an aspect of interconnected webs of tiny nanofibers with diameters of 70-100 nm and lengths of several micrometers.
Leonardo A. Alves; Luciana M. Bertini; Ayla Márcia C. Bizerra; Marcos Carlos de Mattos; Francisco José Q. Monte; Telma L. G. Lemos
Several vegetables were evaluated as biocatalysts for the reduction of ketones. Z. officinale presented the best results with the formation of an alcohol configuration.
Carolina M. Santos; Leandro Cardoso de Morais
The thermodynamic parameters obtained by thermogravimetry in inert and oxidizing atmosphere of dry orange peel were analyzed and compared in order to generate data for the discussion of potential applications of this material as a biofuel.
Mohammad Rezaee; Reyhaneh Shadaniyan; Majid Haji Hosseini; Faezeh Khalilian
A method for the determination of trace amounts of palladium was developed using homogeneous liquid-liquid microextraction via flotation assistance followed by graphite furnace atomic absorption spectrometry.
Kelly da S. Bezerra; Nelson R. Antoniosi Filho
The content from the unsaponifiable fraction of different fats and oils used as feedstock for biodiesel production was determined. The separation and identification of free steroid present in these samples was performed by gas chromatography.
Rafael García; Gabriela Soto; Néstor Escalona; Catherine Sepúlveda; María José Orellana; Natalia Morales; Ljubisa R. Radovic; Robison Buitrago-Sierra; Francisco Rodriguez-Reinoso; Antonio Sepúlveda-Escribano
The lower diversity and concentration of oxygenated surface functional groups in the PSAC-He support led to higher methane conversion on Ni pine sawdust activated carbon catalyst, due to their high Ni dispersion.
Long Jiao; Xiaofei Wang; Shan Bing; Zhiwei Xue; Hua Li
A QSPR study on the boiling point of PCDD/Fs based on the molecular distanceedge vector index was conducted. The boiling point of each PCDD/F congener was predicted by the established QSPR model.
Candelaria Leal Marchena; Silvina Gomez; Clara Saux; Liliana B. Pierella; Luis R. Pizzio
TPA immobilized over NH4ZSM5 zeolites were prepared by wet impregnation. Eg values of NH4ZSM5TPA samples were similar to those reported for TiO2 and irradiated NH4ZSM5TPA samples efficiently degraded methyl orange solutions.
Michelle Mantovani; Erik Moda Aguiar; Wagner Alves Carvalho; Dalmo Mandelli; Maraisa Gonçalves
Preparation of acid carbon from glycerin waste and its utilization as a catalyst for the production of oxygenated products from the etherification reaction.
Cristiane Barata-Silva; Tatyane P. dos Santos; Adherlene V. Gouvêa; Ariane L. Larentis; Josino C. Moreira; Paula N. Sarcinelli
This work aimed to adapt the analysis of methemoglobin recommended by Evelyn - Malloy (visible spectrophotometry), in order to facilitate its application in the field, or to analysis in clinical laboratory, of existing sites of diflubenzuron application.
Jane Raquel Silva de Oliveira; Salete Linhares Queiroz
The importance and value of teaching scientific communication skills in undergraduate chemistry courses.
Roberta P. M. da Costa; Thaiane C. Khalil; Amanda P. F. dos Santos; Débora F. de Andrade; Luiz A. d'Avila
Color scale sample of biodiesel in diesel (B0 to B6), obtained by colorimetric assay for hydroxamic acid.
Paula Cristiana de Freitas; Rui Miguel de Carvalho; Jessee Severo Azevedo Silva; Thiago Prado; Elis Regina Duarte; Vera L. A. Frescura; Eduardo S. Chaves
Ultrasound-assisted extraction and iron colorimetric determination in soils: A comparison with ICP-MS.
Gilson A. Helfer; Fernanda Bock; Luciano Marder; João C. Furtado; Adilson B. da Costa; Marco F. Ferrão
Chemostat: free exploratory multivariate data analysis software and web tool.
Helena S. A. Leite; Paulo A. Porto
In the twentieth century, the periodic table was presented in general chemistry textbooks in different ways: from more descriptive approaches to emphasis on attempts to explain the periodic table in terms of atomic orbitals.
Fabrício G. Menezes; Ana C. O. Neves; Djalan F. de Lima; Sheeza D. Lourenço; Lilian C. da Silva; Kássio M. G. de Lima
A proposal based on biochemical analyses by the enzymatic colorimetric method was found to be highly motivating for undergraduates because of the multidisciplinary theoretical context involved and the possibility of experimental activity.
Gonzalo A. Jaña; Wilson Cardona; Verónica A. Jiménez
A tablet device was used to project digitally handwritten annotations to deliver instruction in undergraduate chemistry lectures.
Adriana Melo; Marcela Seragiotto Amadeu; Marcelo Lancellotti; Luciana Maria de Hollanda; Daisy Machado
On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
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