Percorrer por autor "Almeida, Paulo Russo"
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- Advances in ISO standardization of bee pollenPublication . Anjos, O.; Alpat, Ufuk; Özkök, Aslı; Campos, Maria da Graça; Margaoan, Rodica; Damarli, Emel; Almeida, Paulo Russo; Bobis, Otilia; Varadi, Alina Felicia; Bruneau, Etienne; Li, Hongliang; Geer, Leo de; Meeme, Rehema; Gloger, Thomas; González Porto, Amelia; Yorulmaz, Elif Önder; Samancı, Aslı Elif Tanuğur; Artık, Nevzat; Chhuneja, Pardeep KumarStandardization, although voluntary in many countries around the world, is extremely important for regulating the marketing of goods and services. The standardization of a product guarantees quality parameters not only in the production processes but also in the finished product, thus giving greater confidence to consumers.
- Advances in palynological analysis of bee pollen loadsPublication . Almeida, Paulo Russo; Margaoan, Rodica; Dastan, Tugce; Alpat, Ufuk; Bruneau, Etienne; Özkök, Aslı; Li, Hongliang; Anjos, O.Advances in palynological analysis of bee pollen loads
- Polyphenol content and free radical scavenging activity of bee pollen collected in Castelo Branco, PortugalPublication . Anjos, O.; Fernandes, João; Campos, Maria da Graça; Almeida, Paulo Russo; Michalowska, Anna Gramza; Skrety, JoannaBee pollen is a health food with nutritional and therapeutic properties. The aim of this work was to evaluate free radical scavenging activity (FRSA) in selected samples obtained from local beekeepers in Castelo Branco (Portugal). The identification of the floral origin was performed using acetolysis method. Each sample of bee pollen (0.10 ± 0.01 g) was extracted with methanol, ethanol and water [1, 2] to evaluate which solution provided the best extract. All the experiments were analysed in quadruplicate. The total polyphenol content of bee pollen was analysed by spectrophotometry at 725nm using the Folin-Ciocalteu reagent with ferulic acid as a standard. FRSA was evaluated according to the DPPH · and ABTS ·+ methods. In relation to the content of total polyphenols, the FRSA values varied considerably. Different floral species present species-specific activity [1] but these are dependent on the analytical method and the extraction solvent. On average, the highest polyphenol content was observed in methanol bee pollen extracts with the exception of the mixture B and the Echium sp. pollen (Table 1). For the total FRSA with DPPH and ABTS methods, ethanol pollen extracts show higher activity with the exception of Trifolium spp. where the aqueous extract gives the higher result (Table 1). Mixture B and C ethanolic extracts give the best FRSA values. The ANOVA shows for the three methods that there are significant differences between solvent extracts and protocols, however the variation between the solvent extracts is similar in the different procedures.
- Polyphenol content and free radical scavenging activity of bee pollen collected in Castelo Branco, PortugalPublication . Anjos, O.; Fernandes, João Filipe Barata; Campos, Maria da Graça; Almeida, Paulo Russo; Michałowska, Anna Gramza; Skrety, JoannaBee pollen is a health food with nutritional and therapeutic properties. The aim of this work was to evaluate free radical scavenging activity (FRSA) in selected samples obtained from local beekeepers in Castelo Branco (Portugal). The identification of the floral origin was performed using acetolysis method.