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A 31P NMR study of phosphate levels in roots of ectomycorrhizal and nonmycorrhizal Castanea sativa IPB - Escola Superior Agrária
Martins, Anabela; Santos, M.M.; Santos, Helena; Pais, M.S..
31 P-Nuclear Magnetic Resonance (NMR) was used to assess phosphate distribution in ectomycorrhizal and nonmycorrhizal roots of Castanea sativa Mill. as well as in the mycorrhizal fungus Pisolithus tinctorius in order to gain insight into phosphate trafficking in these systems. The fungus P. tinctorius accumulated high levels of polyphosphates during the rapid phase of growth. Mycorrhizal and nonmycorrhizal roots accumulate orthophosphate. Only mycorrhizal roots presented polyphosphates. The content in polyphosphates increased along the 3 months of mycorrhiza formation. In mycorrhizal roots of plants cultured under axenic conditions, the orthophosphate pool decreased along the culture time. In nonmycorrhizal roots the decrease in the orthophosphate content...
Tipo: Article Palavras-chave: Castanea sativa; Pisolithus tinctorius; Ectomycorrhiza; Phosphate; NMR.
Ano: 1999 URL: http://hdl.handle.net/10198/6420
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A comparative study of tocopherols composition and antioxidant properties of in vivo and in vitro ectomycorrhizal fungi IPB - Escola Superior Agrária
Reis, Filipa S.; Ferreira, Isabel C.F.R.; Barros, Lillian; Martins, Anabela.
In aerobic organisms, the free radicals are constantly being produced during the normal cellular metabolism. The antioxidant properties of many organisms and particularly of wild mushrooms with their content in antioxidant compounds such as tocopherols, can detoxify potentially damaging forms of activated oxygen. Herein, a comparative study of tocopherols composition and antioxidant properties of in vivo (fruiting bodies) and in vitro (mycelia) ectomycorrhizal fungi: Paxillus involutus and Pisolithus arhizus. Tocopherols were determined by high performance liquid chromatography (HPLC) coupled to a fluorescence detector. The antioxidant properties were studied in terms of DPPH radical-scavenging activity, reducing power and inhibition of β-carotene...
Tipo: Article Palavras-chave: Paxillus involutus; Pisolithus arhizus; Fruiting bodies/mycelia; Tocopherols; HPLC-fluorescence; Antioxidant activity.
Ano: 2011 URL: http://hdl.handle.net/10198/3880
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A study of the antitumour potential of three Portuguese wild mushrooms IPB - Escola Superior Agrária
Vaz, Josiana A.; Ferreira, Diana F.; Almeida, Gabriela M.; Cardoso, Adélia; Almeida, Ana P.; Martins, Anabela; Ferreira, Isabel C.F.R.; Vasconcelos, M. Helena.
Natural matrixes such as mushrooms represent a rich source of biologically active compounds with recognized potential in drug discovery and development [1,2]. Indeed, many pre-clinical studies have been conducted in human tumour cell lines and in some cases, a number of compounds extracted from mushrooms have entered clinical trials [3]. Our previous results showed that extracts from Agaricus arvensis, Suillus collinitus and Clytocibe alexandri are promising sources of low molecular weight bioactive compounds [4]. The aim of the present work was to study the antitumour potential of the extracts and isolated compounds from three Portuguese wild mushrooms by verifying their effect on various human tumour cell lines in what concerns effect on cell growth,...
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6002
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Análise metabolómica dirigida em cogumelos silvestres do género Boletus. IPB - Escola Superior Agrária
Heleno, Sandrina A.; Vieira, Vanessa; Gamalho, Azucena M.; Barros, Lillian; Martins, Anabela; Ferreira, Isabel C.F.R..
Os cogumelos são muito apreciados pelas suas propriedades organolépticas e nutricionais, mas também pelas suas propriedades medicinais devido à acumulação de metabolitos bioactivos [1,2]. Neste trabalho, apresentaremos uma análise metabolómica dirigida em espécies silvestres do género Boletus provenientes do Nordeste de Portugal: B. aereus, B. edulis, B. reticulatus (comestíveis), B. purpureus, B. satanas e B. rhodoxanthus (não-comestíveis). Foram analisados metabolitos primários incluindo açúcares (cromatografia líquida de alta eficiência acoplada a detecção por índice de refracção, HPLC-RI), ácidos gordos (cromatografia gasosa acoplada a detecção por ionização de chama, GC-FID), tocoferóis (HPLC-fluorescência) e ácido ascórbico (espectrofotometria)....
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6080
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Antioxidant activity and growth inhibitory activity of Portuguese wild mushrooms IPB - Escola Superior Agrária
Vaz, Josiana A.; Heleno, Sandrina A.; Martins, Anabela; Almeida, Gabriela M.; Vasconcelos, M. Helena; Ferreira, Isabel C.F.R..
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3332
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Antioxidants in Portuguese wild mushrooms: a phenolic profile IPB - Escola Superior Agrária
Heleno, Sandrina A.; Vaz, Josiana A.; Barros, Lillian; Martins, Anabela; Sousa, Maria João; Morais, Jorge Sá; Ferreira, Isabel C.F.R..
The implication of oxidative and nitrosative stress in the etiology and progression of several acute and chronic clinical disorders such as cancer, cardiovascular and neurodegenerative diseases, has led to the suggestion that natural antioxidants can have health benefits as prophylactic agents (1). In this perspective, the presence of mushrooms in our diet which contain significant amounts of bioactive phytochemicals, may provide desirable health benefits, beyond basic nutrition. Many studies have concluded that mushrooms possess potent antioxidant properties related to phenolic compounds. In the present work, the analysis of phenolic compounds in Portuguese wild mushroom species was carried out by high-performance liquid chromatography coupled to...
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3896
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Avaliação do estado de micorrização de plantas inoculadas e não inoculadas de Castanea sativa Mill. cinco anos após inoculação in vitro: relação entre a diversidade de carpóforos e a diversidade de morfotipos em plantas inoculadas e não inoculadas IPB - Escola Superior Agrária
Martins, Anabela; Estevinho, Isabel; Azevedo, João.
Tipo: ConferenceObject Palavras-chave: Micorrizas; Castanheiro.
Ano: 2005 URL: http://hdl.handle.net/10198/3374
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Bioactive and chemical properties of edible mycorrhizal mushrooms from Northeast Portugal. IPB - Escola Superior Agrária
Reis, F.S.; Heleno, S.A.; Barros, Lillian; Sousa, Maria João; Martins, Anabela; Santos-Buelga, C.; Ferreira, Isabel C.F.R..
Mushrooms are widely appreciated all over the world for their nutritional properties1 and pharmacological value as sources of important bioactive compounds.2,3 Mycorrhizal macrofungi associate with plant roots constituting a symbiotic relationship, beneficial for both plant and fungus. In the present work five edible mycorrhizal species (Amanita caesarea, Cortinarius anomalus, Cortinarius violaceus, Lactarius volemus and Suillus luteus) from Northeast Portugal were studied for their bioactive and chemical properties. Antioxidant activity was accessed by in vitro assays: radical scavenging activity, reducing power, and lipid peroxidation inhibition. Bioactive compounds such as phenolic compounds, vitamins (ascorbic acid and tocopherols), sugars and fatty...
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6071
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Bioactive properties of Clitocybe alexandri IPB - Escola Superior Agrária
Vaz, Josiana A.; Heleno, Sandrina A.; Martins, Anabela; Almeida, Gabriela M.; Vasconcelos, M. Helena; Ferreira, Isabel C.F.R..
Some mushrooms may have antioxidant and tumour cell growth inhibitory activities. However, there is no data on Portuguese wild mushrooms. The aim of this work was lo study extracts obtained from the Portuguese wild mushroom Clitocybe alexandri, regard the in vitro antioxidant acclivity and the growth inhibitory activity in human tumour cell lines.
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3696
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Bioactive properties of Lepista inversa IPB - Escola Superior Agrária
Vaz, Josiana A.; Heleno, Sandrina A.; Martins, Anabela; Almeida, Gabriela M.; Vasconcelos, M. Helena; Ferreira, Isabel C.F.R..
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3334
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Bioactivity and chemical characterization of Fistulina hepatica extracts. IPB - Escola Superior Agrária
Vaz, Josiana A.; Tavares, Catarina; Almeida, Gabriela M.; Martins, Anabela; Vasconcelos, M. Helena; Ferreira, Isabel C.F.R..
Fistulina hepatica, the beefsteak fungus, belongs to the order Agaricales and is commonly found all over Europe, North America, Australia and North Africa. Being a good edible species, it has also been investigated for its medicinal and pharmaceutical capacities. The anti-tumor activity of F. hepatica polysaccharides extracts from the mycelial culture was reported after intraperitoneally administration into white mice [1]. Nevertheless, nothing has been reported in phenolic and polysaccharidic extracts from the fruiting body.
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6204
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Biodiversity of macrofungi associated with chestnut in the North East of Portugal. IPB - Escola Superior Agrária
Martins, Anabela; Baptista, Paula; Sousa, Maria João.
The northeast of Portugal (Trás-os-Montes) is a region where chestnut tree (Castanea sativa . Mill.) is one of the most important species in social and economical terms. Macrofungi associated with chestnut tree is of key importance for the knowledge of the biodiversity associated with soil and the equilibrium of the pl(lnt soil interactions and also as a complementary resource of these agroforestry, ecosystems. The study of the biodiversity and of the relative abundance of mycorrhizal and nonmycorrhizal species and of edible vs non edible mushrooms was under survey for 4 years. Ecological and economical impacts of edible fungi collection, including the impact on mycorrhizal and nonmycorrhizal species, are also under evaluation.
Tipo: ConferenceObject Palavras-chave: Macrofungi; Castanea sativa; Diversity; Abundance.
Ano: 2009 URL: http://hdl.handle.net/10198/4476
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Biomolecule profiles in inedible wild mushrooms with antioxidant value IPB - Escola Superior Agrária
Reis, Filipa S.; Pereira, Eliana; Barros, Lillian; Sousa, Maria João; Martins, Anabela; Ferreira, Isabel C.F.R..
The use of natural products isolated from mushrooms, included inedible species, against infection, cancer diseases and other oxidative-stress related diseases is one of the cornerstones of modern medicine. In the present work, the antioxidant molecule profiles of inedible mushroom species were evaluated and compared with those of edible species. The order of antioxidant abundance found in inedible wild mushrooms was: phenolics > flavonoids > ascorbic acid > tocopherols > carotenoids, similar to that of edible species. Furthermore the same energetic biomolecules were found including the disaccharide trehalose, the monosaccharide alcohol derivative mannitol and the fatty acids palmitic, oleic and linoleic acids. Fomitopsis pinicola revealed a...
Tipo: Article Palavras-chave: Wild mushrooms; Biomolecules; Antioxidants; Antioxidant activity.
Ano: 2011 URL: http://hdl.handle.net/10198/6033
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Caracterização do sistema antioxidativo no estabelecimento da associação micorrízica Castanea sativa Mill. / Amanita muscaria IPB - Escola Superior Agrária
Baptista, Paula; Martins, Anabela; Tavares, Rui Manuel; Lino-Neto, Teresa.
As micorrizas são associações mutualistas que se estabelecem entre fungos, pertencentes sobretudo às divisões Basidiomycota, Ascomycota e Zigomycota, e raízes de plantas vasculares. Com o estabelecimento da associação micorrízica, ocorrem várias alterações morfológicas, fisiológicas e ecológicas em ambos os intervenientes, que têm sido objecto de estudo por diversos autores. Contudo, os mecanismos que controlam o processo de colonização e como este processo se inicia é completamente desconhecido. Os poucos trabalhos desenvolvidos nesta área, utilizando micorrizas arbusculares, sugerem que, durante as primeiras horas de invasão do fungo, ocorre uma indução de resposta de defesa por parte da planta hospedeira, semelhante à observada na interacção...
Tipo: ConferenceObject Palavras-chave: Castanea sativa; Amanita muscaria; Peróxido de hidrogénio; Stresse oxidativo.
Ano: 2005 URL: http://hdl.handle.net/10198/5749
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Caracterização química e propriedades antioxidantes de cogumelos silvestres comestíveis provenientes de diferentes habitats. IPB - Escola Superior Agrária
Pereira, Eliana; Barros, Lillian; Martins, Anabela; Ferreira, Isabel C.F.R..
Os cogumelos são muito apreciados pelas suas propriedades organolépticas e nutricionais, constituindo uma boa fonte de proteínas, glúcidos, fibras e vitaminas [1]. Por outro lado, são também reconhecidos pelas suas propriedades medicinais devido à acumulação de metabolitos bioactivos (e.g. compostos fenólicos, terpenos, esteróides e polissacáridos) com actividades anti-inflamatória, anti-diabética, antimicrobiana, antitumoral, entre outras. Os cogumelos comestíveis podem constituir uma fonte de nutracêuticos com importantes propriedades antioxidantes, que podem influenciar positivamente o stresse oxidativo nas células e as doenças mencionadas relacionadas com este processo [2]. Neste trabalho, efectuou-se uma caracterização química e nutricional de...
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6084
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Characterization of the oxidative system on Castanea sativa Mill. in association with the ectomycorrhizal fungi Pisolithus tinctorius and Amanita muscaria during the early stages of contact IPB - Escola Superior Agrária
Baptista, Paula; Martins, Anabela; Tavares, Rui Manuel; Lino-Neto, Teresa.
Mycorrhizae are symbiotic associations between soil borne fungi and the root system of higher plants having a beneficial role on plant growth. The fungus receives carbon from plant, while the plant increased nutrient uptake mediated via the fungus. In agroforestry systems, most of the mycorrhizae belong to ectomycorrhizal (ECM) group being the mechanisms controlling its development poorly defined. During arbuscular mycorrhizal (AM) establishment, some evidences suggest that a temporal and spatial activation of different defence mechanisms by plants are activated. The present work pretends to assess the influence of ECM inoculation on the activity of antioxidant enzymes from roots of Castanea sativa Mill., during the early stages of contact. The...
Tipo: ConferenceObject Palavras-chave: Ectomycorrhizal; Oxidative stress; Pisolithus tinctorius; Amanita muscaria; Castanea sativa Mill..
Ano: 2004 URL: http://hdl.handle.net/10198/5720
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Chemical composition of wild edible mushrooms and antioxidant properties of their water soluble polysaccharidic and ethanolic fractions IPB - Escola Superior Agrária
Vaz, Josiana A.; Barros, Lillian; Martins, Anabela; Santos-Buelga, Celestino; Vasconcelos, M. Helena; Ferreira, Isabel C.F.R..
Mushrooms have become attractive as functional foods and as a source of physiologically beneficial bioactive compounds. Herein, we describe and compare the chemical constituents (phenolic compounds, macronutrients, sugars, fatty acids, tocopherols and ascorbic acid) of four wild edible mushrooms widely appreciated in gastronomy: Armillaria mellea (Vahl) P. Kumm, Calocybe gambosa (Fr.) Donk, Clitocybe odora (Fr.) P. Kumm., Coprinus comatus (O.F. Müll.) Pers. Furthermore, the antioxidant activity of their water soluble polysaccharidic and ethanolic fractions was studied by three different in vitro assays. Coprinus comatus revealed the highest concentrations of sugars (43.23 g/100 g dry weight), PUFA (77.46%), phenolic compounds (45.02 mg/Kg), tocopherols...
Tipo: Article Palavras-chave: Wild edible mushrooms; Bioactive compounds; Phenolic compounds; Polysaccharides; Chemical composition.
Ano: 2011 URL: http://hdl.handle.net/10198/3881
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Clitocybe alexandri extract induces apoptosis in a lung cancer cell line: identification of phenolic acids with cytotoxic potential. IPB - Escola Superior Agrária
Vaz, Josiana A.; Almeida, Gabriela M.; Ferreira, Diana; Ferreira, Isabel C.F.R.; Martins, Anabela; Vasconcelos, M. Helena.
Natural products which grow in adverse conditions, such as fungi, are a possible rich source of biologically active compounds with potential for drug discovery [1,2]. We have recently reported the growth inhibitory activity of extracts from Clitocybe alexandri, a wild mushroom collected from the northwest of Portugal, in human tumour cell lines (NCI-H460, MCF-7, HCT-15 and AGS) [3]. The ethanolic extract was the most potent one, particularly in NCI-H460 cells (GI50 24.8 ± 2.3 μg/ml) [3]. The aim of this work was to further study the potential of this extract as a possible source of cytotoxic compounds. In order to understand the mechanism of action of this extract in the NCI-H460 cells, the effects on cell cycle (following PI labelling) and apoptosis...
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6036
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Comparative study between phenolic and polysaccharidic extracts of Suillus collinitus: chemical characterization and growth inhibitory activity in human tumour cell lines. IPB - Escola Superior Agrária
Vaz, Josiana A.; Almeida, Gabriela M.; Martins, Anabela; Vasconcelos, M. Helena; Ferreira, Isabel C.F.R..
Mushrooms comprise a vast and yet largely untapped source of powerful new pharmaceutical products. In particular, and most importantly for modern medicine, they represent an important source of compounds with potential antitumor and immunostimulating properties, including low-molecular-weight (LMW, e.g. phenolic compounds) and high-molecular-weight (HMW, e.g polysaccharides) compounds. Furthermore, they may have potential as functional foods and sources of novel molecules. The Northeast of Portugal is one of the European regions with higher mushrooms biodiversity.
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6076
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Compounds from wild mushrooms with antitumor potential IPB - Escola Superior Agrária
Ferreira, Isabel C.F.R.; Vaz, Josiana A.; Vasconcelos, M. Helena; Martins, Anabela.
For thousands of years medicine and natural products have been closely linked through the use of traditional medicines and natural poisons. Mushrooms have an established history of use in traditional oriental medicine, where most medicinal mushroom preparations are regarded as a tonic, that is, they have beneficial health effects without known negative side-effects and can be moderately used on a regular basis without harm. Mushrooms comprise a vast and yet largely untapped source of powerful new pharmaceutical products. In particular, and most importantly for modern medicine, they represent an unlimited source of compounds which are modulators of tumour cell growth. Furthermore, they may have potential as functional foods and sources of novel molecules....
Tipo: Article Palavras-chave: Mushrooms; Antitumor; Low-molecular-weight compounds; High-molecular-weight compounds.
Ano: 2010 URL: http://hdl.handle.net/10198/2646
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