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- Gouveia-Figueira, Sandra, et al.
(författare)
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Antioxidant Capacity, Cytotoxicity and Antimycobacterial Activity of Madeira Archipelago Endemic Helichrysum Dietary and Medicinal Plants
- 2014
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Ingår i: Antioxidants. - : MDPI. - 2076-3921. ; 3:4, s. 713-729
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Tidskriftsartikel (refereegranskat)abstract
- The potential bioactivity of dietary and medicinal endemic Helichrysum plants from Madeira Archipelago was explored, for the first time, in order to supply new information for the general consumer. In vitro antioxidant properties were investigated using DPPH, ABTS(+), FRAP and beta-Carotene assays, and the total phenolic content (TPC) and total flavonoid content (TFC) were also determined. Although the results generally showed a large variation among the three analyzed plants, the methanolic extracts showed the highest antioxidant capacity. Exception is made for H. devium n-hexane extract that showed good radical scavenger capacity associated to compounds with good reducing properties. In the Artemia salina toxicity assay and antimycobaterial activity, H. devium was the most potent plant with the lowest LD50 at 216.7 ± 10.4 and MIC ≤ 50mug·mL(-1). Chemometric evaluation (Principal Component Analysis-PCA) showed close interdependence between the ABTS, TPC and TFC methods and allowed to group H. devium samples.
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- Mota, F. de B., et al.
(författare)
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Hybrid platforms of graphane-graphene 2D structures: prototypes for atomically precise nanoelectronics
- 2014
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Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry. - 1463-9076 .- 1463-9084. ; 16:43, s. 23558-23563
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Tidskriftsartikel (refereegranskat)abstract
- First-principles calculations demonstrate that line/ribbon defects, resulting from a controlled dehydrogenation in graphane, lead to the formation of low-dimensional electron-rich tracks in a monolayer. The present simulations point out that hybrid graphane-graphene nanostructures exhibit important elements, greatly required for the fabrication of efficient electronic circuits at the atomic level.
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- Spinola, Vitor, et al.
(författare)
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Myrica faya : A New Source of Antioxidant Phytochemicals
- 2014
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Ingår i: Journal of Agricultural and Food Chemistry. - : American Chemical Society (ACS). - 0021-8561 .- 1520-5118. ; 62:40, s. 9722-9735
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Tidskriftsartikel (refereegranskat)abstract
- Myrica faya is a fruit tree endemic of the Macaronesia (Azores, Madeira, and Canary Island), and its edible fruits are known as "amorinhos" (little loves), bright red to purple berries , used fresh and in jams and liquors. The phenolic composition and antioxidant capacity of leaves and berries from M faya are presented here for the first time. The screening of phytochemical compounds was carried out using high-performance liquid chromatography with online. UV and electrospray ionization mass spectrometric detection (HPLC-DAD-ESI-MS"). There were 55 compounds characterized, mostly galloyl esters of flavonoids and phenolic acids; 26 of the identified compounds (anthocyannis, isoflavonoids, lignans, terpenes, fatty acids, and phenylethanoids) have not been reported in Myrica genus so far. From the data presented here, it can be concluded that faya berries represent a rich source of cyanidin-3-glucoside, flavonoids, vitamin C. In fact, higher antioxidant activity than that of the well-known Myrica rubra berries (Chinese bayberry) has been observed.
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