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Developments in the fermentation process and quality improvement strategies for...
Iglesias, Antonio; Pascoal, Ananias; Choupina, Altino; Carvalho, Carlos Alfredo; Feás, Xesús; Estevinho, Leticia M.Mead is a traditional alcoholic drink derived from the fermentation of diluted honey in the presence of appropriate yeast. Its modern production, in general terms, involves the addition of nutrients to initial diluted honey, pasteurization, yeast inoculation, fermentation and removal of impurities. Undesirable events along the process have been reported; among them, we highlight: delayed or arrested fermentatio...
Effect of Erica sp honey against microorganisms of clinical importance: study o...
Feás, Xesús; Iglesias, Antonio; Rodrigues, Sandra; Estevinho, Leticia M.This study aimed to determine the factors (phenolic compounds, flavonoids, sugars or H2O2) that contribute the most to the antimicrobial activity of heather honey samples against four yeasts and four bacteria with medical importance. To discard the effect of H2O2 in the antimicrobial activity, catalase was added. To evaluate the osmotic pressure’s effect, artificial honey was also used. Phenolic compounds and f...
Triacylglyceride, antioxidant and antimicrobial features of virgin camellia ole...
Feás, Xesús; Estevinho, Leticia M.; Salinero, Carmen; Vela, Pilar; Sainz, Maria J.; Vázquez-Tato, Maria Pilar; Seijas, JulioVirgin oils obtained from seeds of Camellia oleifera (CO), Camellia reticulata (CR) and Camellia sasanqua (CS) were studied for their triacylglyceride composition, antioxidant and antimicrobial activities. Levels of fatty acids determined by 1H-nuclear magnetic resonance analysis were similar to those reported for olive oils (82.30%–84.47%; 5.69%–7.78%; 0.26%–0.41% and 8.04%–11.2%, for oleic, linoleic, linoleni...
Organic bee pollen: botanical origin, nutritional value, bioactive compounds, a...
Feás, Xesús; Vázquez-Tato, Maria Pilar; Estevinho, Leticia M.; Seijas, Julio; Iglesias, AntonioOrganic bee pollen (BP, n = 22) harvested from the Douro International Natural Park (DINP, Portugal) was studied. Nine botanical families were found in the mixture of the samples. The water activity and pH ranged 0.21–0.37 and 4.3–5.2, respectively. The BP analyses averaged 67.7% carbohydrates, 21.8% crude protein, 5.2% crude fat and 2.9% ash. The energy ranged from 396.4 to 411.1 kcal/100 g. The principal fatt...
Commercial bee pollen with different geographical origins: a comprehensive appr...
Nogueira, Carla; Iglesias, Antonio; Feás, Xesús; Estevinho, Leticia M.Since the primordial of humanity, pollen has been considered a good source of nutrients and energy. Its promising healing properties have also been referred to. The present study aimed to characterize, for the first time, eight commercial pollens from Portugal and Spain available on the market studying the legislation on labeling, pollinic origin, physicochemical and microbiological analyses and identification ...
Physicochemical and pollen analysis of Local honeys from the Lima Valley (Portu...
Estevinho, Leticia M.; Feás, Xesús; Seijas, Julio; Vázquez-Tato, Maria PilarAn evaluation was done on the physicochemical quality of nineteen (n=19) Apis mellifera honeys produced in the Lima Valley, Portugal. The rural landscape of the Lima Valley is valuable in social, environmental and economic terms and its conservation and preservation are essential. The evaluated physicochemical characteristics were: moisture, ash, electrical conductivity, pH, hydroxymethylfurfural (HMF), free ac...
Antimicrobial properties of Camellia oleifera oil
Estevinho, Leticia M.; Feás, Xesús; Salinero, Carmen; Mansilla, Pedro; Vela, Pilar; Saínz, Maria J.; Vázquez-Tato, Maria P.; Seijas, JulioCamellias have been used in oriental ethnomedicine and appear very promising for pharmaceutical exploitation since modern science has made it possible to specify their potential medical significance with antimicrobial, antioxidant, antiallergic, antiviral and skin healing properties. In the present study oil obtained from seeds of Camellia oleifera was studied for its antimicrobial activity using clinically iso...
Evaluation of the effect of hidrogen peroxide (H2O2) in the antimicrobial activ...
Feás, Xesús; Seijas, Julio; Vázquez-Tato, Maria Pilar; Dias, Teresa; Estevinho, Leticia M.Bee hive products such as honey, propolis and royal jelly have been extensively used in the past. Their use in Medicine dates back at least 4000 years, to Ancient Egypt where it was used for the treatment of wounds among other conditions. With the discovery of modern antibiotics in the early 20th century, the use of many effective products of traditional medicine was discontinued. Although modern antibiotics us...
Study of organic honey from the Northeast of Portugal
Gomes, Teresa; Feás, Xesús; Estevinho, Leticia M.Concerns about traces of numerous toxic substances and authenticity have prompted consumer demand for honey that is certified as organic, based on strict ecological, natural principles and traceability. The present study aims to characterize organic honey samples (n = 73) from Northeast Portugal, with respect to floral nectar origin, physicochemical parameters and microbial safety. The phenols and flavonoids co...
Honeybee-collected pollen from five Portuguese Natural Parks: palynological ori...
Morais, Margarida; Moreira, Leandro; Feás, Xesús; Estevinho, Leticia M.The aim of this study was to determine the palynological origin, phenolic content, antioxidant and antimicrobial properties of pollen from five Portuguese Natural-Parks [Parque Nacional Peneda Gerês (PNPG); Parque Natural do Montesinho (PNM); Parque Natural do Alvão (PNA); Parque Natural da Serra da Estrela (PNSE) and Parque Natural do Douro Internacional (PNDI)]. Eight families were found in the mixture of bee...
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