Browsing by Author "Lima, Elisabete M. C."
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- Antioxidant activity of macroalgae from the AzoresPublication . Paiva, Lisete S.; Patarra, Rita F.; Neto, Ana I.; Lima, Elisabete M. C.; Baptista, José A. B.Free radical scavenging activity (FRSA) was studied to determine the antioxidant activity of 8 common macroalgae species found in the Azores. Species under study were Porphyra sp., Osmundea pinnatifida, Pterocladiella capillacea, Sphaerococcus coronopifolius and Gelidium microdon, from Rhodophyta; Ulva compressa and Chaetomorpha pachynema, from Chlorophyta and Fucus spiralis from Phaeophyta.The antioxidant activity was evaluated in methanolic extract by a decolourisation solution test of 2,2-diphenyl-1-picrylhydrazyl (DPPH), used as a stable radical. The methanolic extracts were obtained from dried biomass by sequential extractions, attaining a final concentration of 2 mg.mL-1. The FRSA values ranged from 19.54% for S. coronopifolius to 60.05% for F. spiralis with standard deviation (SD) varying between 1.41% and 6.80%. Results indicated that the studied seaweeds are a very promising source of biological active compounds with antioxidante properties. The seaweeds were collected in the Azorean islands where seawater pollution levels are low. Consequently, these seaweeds represent a valuable and good source of antioxidante material with superior beneficial effects on human health.
- Azorean macroalgae as a food supplement: determination of proteins, fiber, and total of lipids and carbohydrates content.Publication . Paiva, Lisete S.; Lima, Elisabete M. C.; Baptista, José A. B.; Patarra, Rita F.; Neto, Ana I.This study evaluates the chemical composition (proteins, fiber, total lipids, total carbohydrates and ash) os selected macroalgae common at the Azorean shores with potencial nutricional value for human food suplement. The protein content ranged from 2.86% to 18.48% of dry weight (DW) for Padina pavonica and Codium adhaerens, respectively and fiber ranged from 31.02% to 69.10% of DW for Codium adhaerens and Cystoseira humilis, respectively. The total of lipids ranged from 1.55% to 5.20% of DW for Cystoseira humulis and Codium adhaerens, respectively, and the total of carbohydrates ranged from 7,61% to 16.78% for Padina pavonica and Codium adhaerens, respectively.
- Comparison of free radical scavenging activities of selected Azorean seaweeds.Publication . Paiva, Lisete S.; Patarra, Rita F.; Neto, Ana I.; Lima, Elisabete M. C.; Baptista, José A. B.
- Extraction and quantification of water-soluble vitamins from selected macroalgae by RP-HPLC.Publication . Guerrero, Pedro J.; Paiva, Lisete S.; Lima, Elisabete M. C.; Baptista, José A. B.; Patarra, Rita F.; Neto, Ana I.
- Mais-valia nutricional de macroalgas marinhas dos Açores. Determinação do teor de fibra bruta.Publication . García, Ismael G.; Paiva, Lisete S.; Lima, Elisabete M. C.; Baptista, José A. B.; Patarra, Rita F.; Neto, Ana I.
- The mineral composition value of selected Azorean macroalgae with beneficial impact on human cardiovascular healthPublication . Paiva, Lisete S.; Lima, Elisabete M. C.; Neto, Ana I.; Batista, José A. B.In view of the current increasing demand of macroalgae for human consumption, due to its high nutritional and health-promoting value, this study determines the ash content and investigates the macromineral composition in seven selected Azorean macroalgae (the Chlorophyta Ulva compressa and Ulva rígida, the Ochrophyta Fucus spiralis and the Rhodophyta Gelidium microdon, Osmundea pinnatifida, Porphyra sp. and Pterocladiella capillacea) in order to estimate its potential impact on human cardiovascular health. The ash content of the studied macroalgae (dry weight basis) ranged from 10.70±2% (P. capillacea) to 38.61±0.7% (O. pinnatifida), which is higher than that of the most common vegetables. Thus, these macraalgae can contribute with essential microelements to human and animal nutrition. Regarding the macromineral composition, as compared to some common foods, the results revealed that F. spiralis, G. microdon, O. pinnatifida and P. capillacea presented a well-balanced Ca/Mg ratio (approx. 1:1) and consequently a potential positive effect on heartbeat regulation and myocardial infarction protection. The results also revealed that all studied macroalgae presented o low Na/K ratio (< 2) and, consequently, a potential human hypotensive effect. Thus, the results suggest that a regular consumption of the studied Azorean macroalgae, either directly or through food supplements, may have a protective effect on cardiovascular diseases, the world's most common cause of Human death.
- Nutritional Value and Antioxidant Activity of Selected Azorean Macrophytes.Publication . Patarra, Rita F.; Paiva, Lisete S.; Leite, João; Lima, Elisabete M. C.; Neto, Ana I.; Baptista, José A. B.
- Nutritional value of selected macroalgaePublication . Patarra, Rita F.; Paiva, Lisete S.; Neto, Ana I.; Lima, Elisabete M. C.; Baptista, José A. B.Macroalgae are traditionally used in human and animal nutrition. Their protein and fiber content have been widely studied and differ according to the species, their geographic origin and their seasonal conditions. In addition to their value for human nutrition, seaweeds have multiple therapeutically applications (e.g., weight control, hypocholesterolemic, antioxidant and antitumor activities, others) and, in general, contribute and promote human health. In the archipelago of the Azores, the consumption of seaweeds is widespread and accepted as a common practice in some islands. This work is aimed at providing information on the protein and fiber content of the locally consumed species, to promote this regional food product that can be potentially profitable from the biotechnology and commercial perspective, and also benefit public health, particularly, taking into account the low level of marine pollution in the Azores archipelago. Protein and fiber content of eight seaweeds (Porphyra sp., Osmundea pinnatifida, Pterocladiella capillacea, Sphaerococcus coronopifolius, and Gelidium microdon, Rhodophyta; Cystoseira abies-marina and Fucus spiralis, Phaeophyta; Ulva compressa, Chlorophyta) were determined using the Kjeldahl method and the Weende method, respectively. The protein content ranged from 6.81 to 26.62 of dry weight for C. abies-marina and U. compressa, respectively. Fiber content was generally higher as compared with that in seaweeds from other origins and ranged from 33.82 to 63.88 for O. pinnatifida and F. spiralis, respectively.
- Potencial nutricional de macroalgas marinhas dos Açores. Determinação do teor de proteína.Publication . Furtado, Miguel; Paiva, Lisete S.; Lima, Elisabete M. C.; Baptista, José A. B.; Patarra, Rita F.; Neto, Ana I.
- Protein and fiber of selected Azorean seaweeds.Publication . Patarra, Rita F.; Paiva, Lisete S.; Neto, Ana I.; Lima, Elisabete M. C.; Baptista, José A. B.