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Assinatura do Candidato: ________________________________________________
UFRN – Exame de Proficiência 2014_1 – Inglês
As questões de 01 a 05, cujas respostas deverão ser redigidas EM PORTUGUÊS, referem -se
ao texto abaixo.
Evaluation of Selected Medicinal Plants Extracted in Different
Concentrations for Antibacterial Activity against Human Pathogens
Ethanol
INTRODUCTION
For centuries, the therapeutic properties of various medicinal plants have been used to treat
human diseases. It has been estimated that between 60 -90% of the populations of developing
countries use traditional and botanical medicines almost exclusively and consider them to be a
normal part of primary healthcare (WHO, 2002). Consumers are increasingly interested in
complementary and alternative medicines, including herbal medicine, as they perceive the se
forms of healing as being both safe and effective. This trend in use of alternative and
complementary healthcare has prompted scientists to investigate the various biological activities
of medicinal plants. In the US, a number of medicinal plants have b een documented as important
source of bioactive compounds (Balunas and Kinghorn, 2005).
In herbal medicine, crude plant extracts in the form of infusion, decoction, tincture or herbal
extract are traditionally used by the population for the treatment of d iseases, including infectious
diseases. Although their efficacy and mechanisms of action have not been tested scientifically in
most cases, these simple medicinal preparations often mediate beneficial responses due to their
active chemical constituents (Barnes et al., 2007). Plant-derived products contain a great diversity
of phytochemicals such as phenolic acids, flavonoids, tannins, lignin, and other small compounds
(Cowan, 1999). These compounds possess numerous health -related effects such as antibacteri al,
antimutagenic, anticarcinogenic, antithrombotic and vasodilatory activities (Bidlack et al., 2000).
The expanding bacterial resistance to antibiotics has become a growing concern worldwide
(Gardam, 2000). Intensive care physicians consider antibiotic -resistant bacteria a significant or
major problem in the treatment of patients (Lepape et al.,2009). Increasing bacterial resistance is
prompting a resurgence in research of the antimicrobial role of herbs against resistant strains
(Alviano and Alviano, 2009; Hemaiswarya et al., 2008). A vast number of medicinal plants have
been recognized as valuable resources of natural antimicrobial compounds (Mahady, 2005).
Medicinal plant extracts offer considerable potential for the development of new agents effective
against infections currently difficult to treat (Iwu et al., 1999).
A wide range of phytochemicals present in plants are known to inhibit bacterial pathogens
(Cowan, 1999; Medina et al., 2005; Romero et al., 2005). Successful determination of such
biologically active compounds from plant material is largely dependent on the type of solvent used
in the extraction procedure. Organic solvents such as ethanol, acetone, and methanol are often
used to extract bioactive compounds (Eloff, 1998). Ethanol, however, is the most commonly used
organic solvent by herbal medicine manufacturers because the finished products can be safely
used internally by consumers of herbal extracts (Low Dog, 2009). Additionally, the bioactivity of
plant extracts depends on the water and ethanol concentration used in the extraction process
(Ganora, 2008). Although a great amount of research has been performed to determine the
antibacterial activity of medicinal plants, optimal extraction of bioactive compounds has not been
well established for most plants.
To maximize the recovery of plant antimicrobials for human consumption, establishing optimal
and specific extraction condition using binary solvent system of ethanol and water is important.
Therefore, the objective of this study was to determine the best ethanol to water ratio to prepare
extracts from selected medicinal plants to optimize their antimicrobial activity against several
human pathogenic bacteria. W e report a comparative study on the antimicrobial properties of
eight medicinally important plants extracted with three different concentrations of ethanol to
assess the concentration that would produce the highest antimicrobial action on selected human
pathogens.
Disponível
em: <http://scholarworks.umass.edu/jmap/vol1/iss2/4 >
Plants1(2):60-68. Acesso em: 05 mar. 2014. [Adaptado].
UFRN – Exame de Proficiência 2014_1 – Inglês – Ciências Biológicas
Journal
of
Medicinally
1
Active
Questão 1
Qual a relação entre as populações dos países em desenvolvimento e os tratamentos à base de
plantas medicinais?
Espaço para Resposta
Questão 2
Explique por que preparados medicinais simples produzidos a partir de plantas, mesmo não
tendo sido testados cientificamente, são considerados por produzir efeitos terapêuticos.
Espaço para Resposta
UFRN – Exame de Proficiência 2014_1 – Inglês – Ciências Biológicas
2
Questão 3
Discorra sobre o que é dito no texto acerca dos fitoqu ímicos presentes nas plantas, da
determinação bem sucedida desses compostos e sua bioatividade.
Espaço para Resposta
Questão 4
Cite os solventes orgânicos apresentados no texto, utilizados com frequência para extrair os
compostos bioativos das plantas, apontando e justificando qual deles é o mais usado na
fabricação de medicamentos.
Espaço para Resposta
UFRN – Exame de Proficiência 2014_1 – Inglês – Ciências Biológicas
3
Questão 5
 Traduza o fragmento textual abaixo no espaço reservado para isso.
 Seu texto deverá apresentar clareza e estar bem articulado tanto e m termos estruturais
quanto de sentido.
To maximize the recovery of plant antimicrobials for human consumption, establishing
optimal and specific extraction condition using binary solvent system of ethanol and
water is important. Therefore, the objective of this study was to determine the best
ethanol to water ratio to prepare extracts from selected medicinal plants to optimize
their antimicrobial activity against several human pathogenic bacteria.
ESPAÇO DESTINADO AO TEXTO DEFINITIVO
UFRN – Exame de Proficiência 2014_1 – Inglês – Ciências Biológicas
4