624 research outputs found
Identificação da origem botânica do mel por DNA barcoding
O mel e um produto natural muito apreciado pelas suas propriedades sensoriais,
nutricionais e medicinais. Os méis monoflorais são produtos de valor acrescentado por serem
considerados de elevada qualidade e com aroma e sabor bem definidos, sendo por isso susceptíveis a adulterações. Tal facto torna importante o desenvolvimento de novas metodologias para a avaliação
da autenticidade e origem botânica. 0 método usado atualmente para a determinação da origem
botânica baseia-se na analise melissopalinol6gica, que e morosa e requer técnicos especializados
[1]. Os métodos de ADN apresentam-se como alternativas promissoras para a identificação de espécies em matrizes complexas e processadas.info:eu-repo/semantics/publishedVersio
Autenticação de produtos cárneos com a designação Halal: Deteção e quantificação de derivados de suíno (Sus scrofa)
Devido aos recentes escândalos alimentares relacionados com adulterações em produtos cárneos, tem-se assistido a uma maior atenção por parte dos consumidores e autorida-des sobre a ocorrência de fraudes neste setor, especialmen-te no que respeita a substituição de carne de espécies ani-mais de valor elevado por proteínas musculares de mais baixo custo. Em particular, devido ao seu baixo preço e ele-vada disponibilidade, a carne de porco e/ou derivados de suíno (gordura, plasma, colagénio, entre outros) podem ser fraudulentamente adicionados em produtos cárneos, tendo por objetivo o aumento de lucros de fabricantes pouco es-crupulosos [1,2]. Para além destas práticas representarem uma fraude económica, a presença de espécies animais não declaradas na rotulagem é algo que causa elevada preocu-pação em certos grupos religiosos para os quais o consumo de determinadas espécies é proibido.Os autores agradecem o apoio financeiro da Fundação para a Ciência e a Tecnologia (FCT) através do projeto PEst-C/EQB/LA0006/2013.info:eu-repo/semantics/publishedVersio
Characterization of Three Portuguese Varietal Olive Oils Based on Fatty Acids, Triacylglycerols, Phytosterols and Vitamin E Profiles: Application of Chemometrics
In Portugal, olive oil production is considered an ancient
activity, where old olive groves can still be observed. In the
last few years monovarietal groves seem to be increasing,
though some disadvantages, such as the susceptibility to
insects and diseases, can result from the growth of individual
olive varieties (Aguilera et al., 2005). In some typical
producer countries, the olive cultivation is being improved
by renewing old trees, reducing the association with other
crops, selecting the olive varieties suited to local agroclimates
and planting new single variety orchards (Criado
et al., 2008). This is leading to an increase in the prevalence
of monovarietal olive oils
Food supplements adulteration with undeclared synthetic phosphodiesterase type-5 drugs (PDE-5) inhibitors
The use ofplant food supplements (PFS) in developed countries is becoming increasingly
popular mostly due to the consumers' widespread idea that natural products are safer
and healthier than conventional pharmaceutical drugs [l]. However, in the last years,
several studies have been showing the existence of gaps in PFS regulation that can
result in insuíficient quality control and intentional adulteration ofthese products [2].
Among the issues that can aíFect PFS safety, the illegal addition of pharmaceutical
substances is of major concern, since unscrupulous producers can dope PFS to provide
for quick effects.
Supplements used for sexual performance improvement are among the most popular
PFS used by males. One of the major concerns in this type of product is the possible
adulteration with drugs used for the treatment of erectile dysfunction, namely
synthetic phosphodiesterase type-5 (PDE-5) inhibitor drugs, such as sildenafil,
vardenafil and tadalafil which are approved prescription drugs being marketed as
Viagra (Pfizer, USA), Levitra (Bayer Pharmaceuticals Co., Germany) and Cialis (Elli
Lilly, USA), respectively. Since these drugs can present side eífects, its illegal addition
in PFS can seriously endanger consumers' health. In particular, individuais for whom
conventional PDE-5 inhibitor drugs are contraindicated and consequently use food
supplements as an alternative maybe at risk ifthe clandestine addition ofthese drugs
occurs. In the last years, the presence ofthis type ofdrugs have been detected by FDA
in the US, and reported in food supplements commercialized in Ásia, however studies
regarding this issue in the EU are almost inexistent.
For the presented reasons, an analytical methodology based on the use of high
performance liquid chromatography coupled to a fluorescence detector in series with a
photodiode array (HPLC-FL-PDA) is proposed for the detection ofPDE-5 inhibitors,
namely sildenafil and its analogue acetildenafil, vardenafil and tadalaíil, illegally added
to supplements used for aphrodisiac purposes.to FCT (PEst-C/EQB/LA0006/2013 and EXPL/DTP-SAP/1438/2013) and QREN
(NORTE-07-0124-FEDER-000069-CIÊNCIA DO ALIMENTO).info:eu-repo/semantics/publishedVersio
Food supplements adulteration with undeclared synthetic phosphodiesterase type-5 drugs (PDE-5) inhibitors
The use ofplant food supplements (PFS) in developed countries is becoming increasingly
popular mostly due to the consumers' widespread idea that natural products are safer
and healthier than conventional pharmaceutical drugs [l]. However, in the last years,
several studies have been showing the existence of gaps in PFS regulation that can
result in insuíficient quality control and intentional adulteration ofthese products [2].
Among the issues that can aíFect PFS safety, the illegal addition of pharmaceutical
substances is of major concern, since unscrupulous producers can dope PFS to provide
for quick effects.
Supplements used for sexual performance improvement are among the most popular
PFS used by males. One of the major concerns in this type of product is the possible
adulteration with drugs used for the treatment of erectile dysfunction, namely
synthetic phosphodiesterase type-5 (PDE-5) inhibitor drugs, such as sildenafil,
vardenafil and tadalafil which are approved prescription drugs being marketed as
Viagra (Pfizer, USA), Levitra (Bayer Pharmaceuticals Co., Germany) and Cialis (Elli
Lilly, USA), respectively. Since these drugs can present side eífects, its illegal addition
in PFS can seriously endanger consumers' health. In particular, individuais for whom
conventional PDE-5 inhibitor drugs are contraindicated and consequently use food
supplements as an alternative maybe at risk ifthe clandestine addition ofthese drugs
occurs. In the last years, the presence ofthis type ofdrugs have been detected by FDA
in the US, and reported in food supplements commercialized in Ásia, however studies
regarding this issue in the EU are almost inexistent.
For the presented reasons, an analytical methodology based on the use of high
performance liquid chromatography coupled to a fluorescence detector in series with a
photodiode array (HPLC-FL-PDA) is proposed for the detection ofPDE-5 inhibitors,
namely sildenafil and its analogue acetildenafil, vardenafil and tadalaíil, illegally added
to supplements used for aphrodisiac purposes.to FCT (PEst-C/EQB/LA0006/2013 and EXPL/DTP-SAP/1438/2013) and QREN
(NORTE-07-0124-FEDER-000069-CIÊNCIA DO ALIMENTO).info:eu-repo/semantics/publishedVersio
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