AVALIAÇÃO GEOQUÍMICA DA CONCENTRAÇÃO DE Fe, Cr, Pb, Zn, Cu E Mn NO SEDIMENTO ESTUARINO DO RIO JACUÍPE, BAHIA

Este trabalho teve o objetivo de avaliar as concentrações de Fe, Cr, Pb, Zn, Cu e Mn no sedimento estuarino do rio Jacuípe, Bahia. Região receptora de fontes potencialmente poluidoras, oriundas de um dos maiores complexos industriais do Brasil, que durante alguns anos lançou seus resíduos nas águas do rio. Para uma avaliação do sedimento foram escolhidos cinco pontos de amostragem, obtendo-se testemunhos de 40 cm de comprimento, fatiados na ordem de 0-10, 10-20, 20-35 cm. Além da quantificação dos metais foram feitas análises de nitrogênio total e carbono orgânico, ao qual demonstrou uma variação nos pontos com aumento da profundidade, já o nitrogênio não apresentou uma variação significativa. Para os metais observou-se uma variação de seus teores ao longo do tempo de deposição, em especial para o ponto P3. Sendo assim, faz-se necessário um estudo mais detalhado do comportamento dos metais em frações mais profundas

NATURAL ATTENUATION OF BTEX CONTAMINANTS IN THE GROUNDWATER OF THE MOST POPULOUS CITY IN NORTHEASTERN BRAZIL

In order to investigate the contamination and attenuation of BTEX compounds from fuel tank leaks into the Basin of Lucaia’s river aquifer, Salvador, Bahia (Brazil), it was determined in samples of groundwater concentrations of volatile aromatics benzene, toluene, ethylbenzene and xylenes (BTEX), sulfate, nitrate and iron (II) in two distinct periods. The concentrations of compounds were compared to ascertain the yield reduction of BTEX in the sampling points up to 82%. Isotenor curves were generated by observing the behavior of composites and the relation of Eh and nitrate consumption with natural attenuation of BTEX, verifying that it does not occur in a wide spread critical levels and dangerous for the population

VALIDAÇÃO DE MÉTODO CROMATOGRÁFICO ACOPLADO AO PURGE AND TRAP PARA ANÁLISES AMBIENTAIS

O método de determinação de compostos voláteis por Purge and Trap e cromatografia gasosa acoplada à espectrometria de massa (CG-EM), EPA 8260C e 5030C, foi implantado no Laboratório de Estudos do Petróleo (LEPETRO), para determinar a concentração de compostos voláteis BTEX nas águas subterrâneas de áreas de postos de gasolina. A validação do método foi realizada pelo estudo de seletividade, linearidade, sensibilidade, exatidão, precisão, limite de detecção (LD), limite de quantificação (LQ) e robustez. A curva de calibração varia 2-200 μg.L-1, com valores de precisão com um intervalo 70-120%, com precisão de 20%

Natural attenuation of BTEX contaminants in the groundwater of the most populous city in Northeastern Brazil

Cadernos de Geociências, v. 13, n. 1 - Especial UFBA 70 anos, Jul. 2016.Original publicado em Cadernos de Geociências, v. 12, n. 1-2, Maio-Nov. 2015

Melipona mondury produces a geopropolis with antioxidant, antibacterial and antiproliferative activities

ABSTRACT Geopropolis is a special type of propolis produced by stingless bees. Several pharmacological properties have been described for different types of geopropolis, but there have been no previous studies of the geopropolis from Melipona mondury. In this study, we investigated the antioxidant, antibacterial, and antiproliferative activities of M. mondury geopropolis, and determined its chemical profile. The antioxidant activity was determined using in vitro ABTS·+, ·DPPH, and β-carotene/linoleic acid co-oxidation methods. The antibacterial activity was determined using a microdilution method with Pseudomonas aeruginosa, Staphylococcus aureus, and methicillin-resistant S. aureus. The antiproliferative effect was determined in tumor cell lines using the Alamar Blue assay. The chemical profile was obtained using UHPLC-MS and UHPLC-MS/MS. The butanolic fraction had the highest concentration of phenolic compounds and more potent antioxidant properties in all assays. This fraction also had bacteriostatic and bactericidal effects against all bacterial strains at low concentrations, especially S. aureus. The hexane fraction had the highest antiproliferative potential, with IC50 values ranging from 24.2 to 46.6 µg/mL in HL-60 (human promyelocytic leukemia cell) and K562 (human chronic myelocytic leukemia cell), respectively. Preliminary chemical analysis indicates the presence of terpenes and gallic acid in the geopropolis. Our results indicate the therapeutic potential of geopropolis from M. mondury against inflammatory, oxidative, infectious, and neoplastic diseases

Melipona mondury produces a geopropolis with antioxidant, antibacterial and antiproliferative activities

<div><p>ABSTRACT Geopropolis is a special type of propolis produced by stingless bees. Several pharmacological properties have been described for different types of geopropolis, but there have been no previous studies of the geopropolis from Melipona mondury. In this study, we investigated the antioxidant, antibacterial, and antiproliferative activities of M. mondury geopropolis, and determined its chemical profile. The antioxidant activity was determined using in vitro ABTS·+, ·DPPH, and β-carotene/linoleic acid co-oxidation methods. The antibacterial activity was determined using a microdilution method with Pseudomonas aeruginosa, Staphylococcus aureus, and methicillin-resistant S. aureus. The antiproliferative effect was determined in tumor cell lines using the Alamar Blue assay. The chemical profile was obtained using UHPLC-MS and UHPLC-MS/MS. The butanolic fraction had the highest concentration of phenolic compounds and more potent antioxidant properties in all assays. This fraction also had bacteriostatic and bactericidal effects against all bacterial strains at low concentrations, especially S. aureus. The hexane fraction had the highest antiproliferative potential, with IC50 values ranging from 24.2 to 46.6 µg/mL in HL-60 (human promyelocytic leukemia cell) and K562 (human chronic myelocytic leukemia cell), respectively. Preliminary chemical analysis indicates the presence of terpenes and gallic acid in the geopropolis. Our results indicate the therapeutic potential of geopropolis from M. mondury against inflammatory, oxidative, infectious, and neoplastic diseases.</p></div