ORGANIC COMPOUNDS.In the literature there are a considerable number of chemical and biochemical tests for evaluation in vitro antioxidant activities pure compounds or fractions organic extracts.These important tools screening synthetic natural bioactive compound as well they can be employed food chemistry.This work is critical review main methods determination.

Experiments were conducted in order to characterize the injuries on leaf structure and micromorphology of G. americana evaluate degree susceptibility this species simulated acid rain. Plants exposed rain (pH 3.0) for ten consecutive days. Control plants submitted only distilled water 6.0). Leaf tissue was sampled fixed light scanning electron microscopy. Necrotic interveinal spots blade occurred. Epidermis mesophyll cells collapse, hypertrophy spongy parenchyma cells, accumulation phenolic...

The potential of three aquatic macrophytes, Azoll caroliniana, Salvinia minima and Lemna gibba, was evaluated in this work aimed at selection plants to be used remediation environments contaminated by arsenic (As). experiments were carried out a greenhouse during six days pots containing Hoagland solution (¼ ionic strength) As concentrations 0.5; 2.5 5.0 mg L-1. species showed greater accumulation as the concentration metalloid increased. However, reduction detected fresh dry mass gain when...

This work describes the phytochemical study of stem bark and leaves Cenostigma macrophyllum Tul. (Leguminosae). Through usual chromatographic techniques were isolated bergenin as primary compound from gallic acid, methyl gallate, ellagic quercetin, quercetin-3-O-β-D-glucopyranoside, quercetin-3-O-(6"-O-galloyl)-β-D-glucopyranoside (tellimoside), quercetin-3-O-(6"-O-E-p-coumaroyl)-β-D-glucopyranoside (helichrysroside), agathisflavone vitexin obtained. The isolates identified by spectroscopic...

A cyanobacterial mat colonizing the leaves of Eucalyptus grandis was determined to be responsible for serious damage affecting growth and development whole plants under clonal hybrid nursery conditions. The dominant species isolated in BG-11 medium lacking a source combined nitrogen identified by cell morphology characters molecular phylogenetic analysis (16S rRNA gene cpcBA-IGS sequences). strain represents novel genus Brasilonema is designated octagenarum UFV-E1. Thin sections E. analyzed...

The potential of three macrophytes, Azolla caroliniana, Salvinia minima, and Lemna gibba was assessed in this study to select plants for use environmental remediation contaminated with atrazine. Experiments were carried out a greenhouse over six days pots containing Hoagland 0.25 strength nutritive solution at the following atrazine concentrations: 0; 0.01; 0.1; 1.0; 10.0 mg L-1. Decrease biomass accumulation observed as well toxic effects evidenced by symptomatology developed which caused...

Abstract The phytoremediation technique, which consists of using plants to remove ions, has been increasingly chosen over past decades due its low-cost technology mitigate contaminated areas. aim this study was evaluate the potential aquatic macrophytes, Azolla caroliniana Willd, Salvinia minima Baker and Spirodela polyrhiza (L.) Schleiden, accumulate manganese (Mn), an element which, at high concentrations, may be toxic human populations. three species accumulated Mn in their tissues...

Com os objetivos de avaliar o grau suscetibilidade e caracterizar as injúrias na morfoanatomia folhas Magnolia ovata, mudas foram submetidas à chuva simulada com flúor (10 µg.ml-1 F-) por 10 dias consecutivos. No tratamento controle, utilizou-se apenas água deionizada. Folhas coletadas para quantificação matéria seca fixadas análises em microscopia luz eletrônica varredura. As apicais apresentaram pequena porcentagem necroses intervenais marginais uma ou ambas faces maior acúmulo flúor,...

The aim of this research was to determine the phytoconstituents essential oil (EO) obtained from stems Croton tricolor and study its antifungal activity against several Candida species. EO extracted C. by hydrodistillation with a Clevenger apparatus. This characterized four major components: epiglobulol, α-bisabolol, α-trans-bergamotol β-caryophyllene. Microbiological assays were performed using microdilution method in liquid medium minimum inhibitory concentration (MIC) for each strain....

Hyperhydricity was observed throughout in vitro multiplication phase of a Eucalyptus grandis clone. Ultrastructural approach tissue and cell differentiation, izoenzyme patterns, binding protein (BiP) expression, pigment content were performed. Hyperhydric tissues showed reduction wall deposition, membranous organelles, higher vacuolation, more intercellular spaces than its normal counterpart. Additionally, several vesicles present hyperhydric cells suggesting the occurrence organelle...

This work describes the phytochemical study of stems Mimosa invisa (Mimosaceae) and evaluation antioxidant potential isolated compounds. Cromatografic techniques were employed to isolate salicifoliol, pinoresinol, quercetin, quercetin-3-O-rhamnopyranosyl, quercetin-3-O-arabinofuranosyl lupeol, β-amyrin, sitosterol, p-hydroxy coumaric acid, 4-hydroxy-3-methoxy benzaldehyde (vanillin), 4-hydroxy-3,5-dimethoxy benzaldehyde, benzoic acid 4',6,7- trimethoxy flavonol. The latter had been...

Todos os Santos Bay (BTS) is the second largest coastal bay in Brazil, which occupies an area of 1,233 km 2 and 184 coastline perimeter.The BTS includes urban area, including Salvador, with more than 3 million inhabitants extensive industrial area.This paper focuses on chemical contamination atmosphere marine system BTS, discussing main sources different compounds found.In several regions atmospheric particulate matter, suspended algae, sediment biota are enriched trace elements (As, Cd, Pb,...

A Baia de Todos os Santos (BTS) e a segunda maior baia costeira do Brasil, em que ocupa uma area 1.233 km 2 184 perimetro costa. O entorno da BTS compreende urbana, incluindo Salvador, com mais 3 milhoes habitantes extensa zona industrial. foco deste trabalho esta sobre contaminacao quimica atmosfera sistema costeiro marinho BTS, discutindo as principais fontes diferentes compostos encontrados. E m varias regioes o material particulado atmosferico, suspensao, sedimentos biota encontram-se...

The evaluation of the toxicity effects arsenic (As) and tolerance potential Eichhornia crassipes Salvinia auriculata regarding to this element, is an important step in selection plants for purpose phytoremediation. Both species were collected at clean water bodies, disinfected, acclimatized submitted treatments with As as sodium arsenate concentrations: 0, 0.5, 2.5 5.0 mg.L–1. After seven days exposure As, washed a solution HCl 0.1N. Shoot root tissues separated, dried weighed. content...

In the present study, an on-line preconcentration system for determination of Cd and Zn was developed. This involves solid-phase extraction metals using a minicolumn filled with Amberlite XAD-2 modified 2-(5-bromo-2- pyridylazo)-5-diethylaminophenol (Br-PADAP) detected by flame atomic absorption spectrometry (FAAS). After step, hydrochloric acid used in elution process, order to transport analytes directly spectrometer flame. A Doehlert design optimize variables involved performance. The...