Browsing by Author "Gomes, R."
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- Bioactive and nutritional potential of Alaria esculenta and Saccharina latissimaPublication . Afonso, C.; Matos, J.; Guarda, I.; Gomes-Bispo, A.; Gomes, R.; Cardoso, C.; Gueifão, S.; Delgado, I.; Coelho, Inês; Castanheira, Isabel; Bandarra, N.M.The brown seaweed species Alaria esculenta and Saccharina latissima are commercial edible resources in Norway. There are knowledge gaps regarding these species. Accordingly, they were characterized and their bioactivity and bioaccessibility evaluated. The fatty acid (FA) analysis revealed anω-3/ω-6 ratio of almost 2 in A. esculenta vs 1 in S. latissima. The FAs 18:4ω-3 (stearidonic acid) and 20:5ω-3 (eicosapentaenoic acid) were themain contributors to the relativeω-3 polyunsaturated FA richness in A. esculenta. This seaweed was also rich in fucoxanthin (66.1 ± 20.1 mg (100 g)−1 dw), representing approximately 4.1% of the total lipids. Hence, this species may be a source of natural fucoxanthin. Anti-inflammatory activity was significantly stronger (p < 0.001) in the ethanolic than in the aqueous extracts of the algal biomass, 48.3–60.4% vs 18.2–38.6% cyclooxygenase-2 (COX-2) inhibition. In the bioaccessible fraction of both species, phenolic content and antioxidant activitywere low.Moreover, the anti-inflammatory capacity was largely lost in this fraction, especially in the case of S. latissima. Regarding elemental composition, there were no large differences between the two brown seaweed species, being As levels high (53.11–58.93 mg kg−1 dw). However, this As is mostly organic and accordingly poses a lower risk to human health. The I content was high, especially in S. latissima, 2829 ± 58 mg kg−1 dw (557 ± 17 mg kg−1 dw in A. esculenta). Taking into account I levels, only 0.05 g and 0.39 g of S. latissima per day (based on I levels before digestion) are enough to reach I DRI and I TUIL, respectively, or 0.07 g and 0.57 g per day (based on I levels after digestion), for I DRI and I TUIL, respectively. The attained results point to an untapped potential regarding development of functional foods and other products with high-added value—particularly in the case of A. esculenta.
- Commercial Red Seaweed in Portugal (Gelidium sesquipedale and Pterocladiella capillacea, Florideophyceae): Going beyond a Single-Purpose Product Approach by Valorizing BioactivityPublication . Matos, J.; Gomes, A,; Cardoso, C.; Afonso, c.; Campos, A.M.; Gomes, R.; Falé, P.; Delgado, Inês; coelho, Inês; Castanheira, Isabel; Bandarra, N.M.The red seaweed species Gelidium sesquipedale and Pterocladiella capillacea are commercially explored as one of the main seaweed resources in Portugal. However, they are essentially harvested for extraction of agar, leaving a large biomass share needing an adequate valorization. The two studied red seaweed species were characterized by a large share of saturated fatty acids (SFA) in the vicinity of 60% (of the total FAs). Concerning ω3 highly unsaturated FAs, only EPA reached a significant percentage in P. capillacea and G. sesquipedale, 13.0 ± 0.5% and 7.7 ± 0.1%, respectively. In comparison with other seaweeds, the phenolic content was low for both species and aqueous and ethanolic extracts. The antioxidant activity was also low or even undetected. Regarding anti-inflammatory activity, as measured by inhibition of cyclooxygenase-2, it was not detected in the aqueous extracts of the seaweed, but was significant in the ethanolic extracts, 69 ± 3% and 54 ± 6%, for P. capillacea and G. sesquipedale, respectively. Concerning cytotoxicity, while ethanolic extracts did not cause any detectable cytotoxicity, the biomass and the aqueous extracts reduced HeLa cell viability. Finally, the elemental composition showed differences between the two seaweed species. In particular, G. sesquipedale contained a higher I level than P. capillacea, 807 ± 51 mg/kg dw vs 435 ± 18 mg/kg dw. On the whole, attained results were promising and warrant further study.
- Farming a wild seaweed and changes to its composition, bioactivity, and bioaccessibility: The Saccorhiza polyschides case studyPublication . Cardoso, C.; Almeida, J.; Coelho, I.; Delgado, I.; Gomes, R.; Quintã, R.; Bandarra, N.M.; Afonso, C.The nutritional value, elemental and fatty acid composition as well as key biological activities were determined in a large brown seaweed species (Saccorhiza polyschides, abundant in European shores), taking into account the effects of wild vs farmed and land-based vs open sea Integrated Multi-Trophic Aquaculture (IMTA) system dichotomies. The results showed that S. polyschides has significant amounts of relevant nutrients, some biological activity (anti-inflammatory), high contents of the essential elements Se (1.07–1.79 mg/kg dw) and I (367–522 mg/kg dw), and a high bioaccessibility of I. However, As levels should be monitored, given their high bioaccessibility (∼60–70% range), and I levels may translate into excessive I intake if too much seaweed is consumed (if daily consumption of dried S. polyschides exceeds 3 g dw). Regarding the wild-farmed dichotomy, wild S. polyschides had a moderately higher nutritional value, including a better ω3/ω6 ratio, but a lower Se content than farmed S. polyschides, 0.80 ± 0.01 vs 0.58–0.69 and 1.07 ± 0.05 vs 1.16–1.79 mg/kg dw, respectively. Furthermore, bioaccessibility of elements was not much affected by cultivation. Concerning land-based vs open sea IMTA, in comparison to S. polyschides in earthen ponds, lower Hg and Pb contamination, but higher Cd levels were determined in the seaweed cultivated in open sea. S. polyschides farming per se did not have a large deleterious impact on the characteristics of this edible seaweed and may ensure the production of large amounts of algal biomass for feed, food, and nutraceutical applications.
- Origin and spread of a common deletion causing mucolipidosis type II: insights from patterns of haplotypic diversityPublication . Coutinho, Maria Francisca; Encarnação, M.; Gomes, R.; Da Silva Santos, L.; Martins, S.; Sirois-Gagnon, D.; Bargal, R.; Filocamo, M.; Raas-Rothschild, A.; Tappino, B.; Laprise, C.; Curyg, G.K.; Schwartz, I.; Artigalás, O.; Prata, M.; Alves, SandraMucolipidosis II (ML II alpha/beta), or I-cell disease, is a rare genetic disease in which activity of the uridine diphosphate (UDP)-N-acetylglucosamine:lysosomal enzyme N-acetylglucosamine-1-phosphotransferase (GlcNAc-phosphotransferase) is absent. GlcNAc-phosphotransferase is a multimeric enzyme encoded by two genes, GNPTAB and GNPTG. A spectrum of mutations in GNPTAB has been recently reported to cause ML II alpha/beta. Most of these mutations were found to be private or rare. However, the mutation c.3503_3504delTC has been detected among Israeli and Palestinian Arab-Muslim, Turkish, Canadian, Italian, Portuguese, Irish traveller and US patients. We analysed 44 patients who were either homozygous or compound heterozygous for this deletion (22 Italians, 8 Arab-Muslims, 1 Turk, 3 Argentineans, 3 Brazilians, 2 Irish travellers and 5 Portuguese) and 16 carriers (15 Canadians and 1 Italian) for three intragenic polymorphisms: c.-41_-39delGGC, c.18G>A and c.1932A>G as well as two microsatellite markers flanking the GNPTAB gene (D12S1607 and D12S1727). We identified a common haplotype in all chromosomes bearing the c.3503_3504delTC mutation. In summary, we showed that patients carrying the c.3503_3504delTC deletion presented with a common haplotype, which implies a common origin of this mutation. Additionally, the level of diversity observed at the most distant locus indicates that the mutation is relatively ancient (around 2063 years old), and the geographical distribution further suggests that it probably arose in a peri-Mediterranean region.