A leitura como um processo cognitivo
Figueiredo, Olívia Maria
1999-01-01
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The market of processed fruits has grown rapidly in recent decades as a result of
changes in consumer preferences and attitudes. Strawberry is one of most preferred fruits
to incorporate in milk based products or other derived-products.
Strawberry antioxidant capacity is affected by the different post-harvest features,
such as processing and storage conditions (e.g., time, temperature). Although reducing
quality, these processing conditions are required for safety, quality and economic reasons.
In order to assure microbial stability some thermal processing techniques can be
applied. These techniques as well storage conditions after processing can affect the
phytochemicals composition and nutritional quality of fruit by promoting changes
resulting from cell wall and membrane disruption and chemical reactions.
Thermal processin...
Direct hydrolysis of whey leads to peptides that possess higher digestibility and better functional properties, so these may be incorporated in food formulae to improve their performance. Incubation of pure bovine α-La and β-Lg, as well as of caprine, bovine and ovine wheys with trypsin and pepsin led to the production of various hydrolysates, which absorb at 280 nm and are characterized by molecular weights ranging from ca. 8000 Da to less than 500 Da. Bovine α-La was slowly hydrolysed by trypsin but rapidly by pepsin, in either pure form or in whole whey. Bovine β-Lg was more rapidly broken down by trypsin, and less rapidly by pepsin than α-La, and a similar performance was observed when β-Lg was tested on whole whey. In most whey digests, a peak corresponding to a molecular weight between 3000 and 4000 Da was observed by gel permeat...
Peach is a fruit with high content of phytochemical compounds with antioxidant activity, namely polyphenols and carotenes that make them a healthy fruit for consumers. Peach (Prunus persica (L.)), is an important commercial Mediterranean fruit during summer season not only for its high water content, fibre and minerals, but also for its high content in antioxidant molecules such as procyanidins, anthocyanins, catechins, phenolic acids and carotenoids (lutein, zeaxanthin, β-cryptoxanthin and β-carotene). These compounds in peach fruit vary strongly in relation to different environmental and agricultural factors, such as cultivar, rootstock, water and ripening stage at harvest.
Besides the regular peach consumption as fresh fruit, processed products such as juices, jams, jellies, smoothies, canned fruit and others, are usually produced ...
tIn this study, chitosan nanoparticles were used to encapsulate antioxidant rosmarinic acid, Salvia offici-nalis (sage) and Satureja montana (savory) extracts as rosmarinic acid natural vehicles. The nanoparticleswere prepared by ionic gelation using chitosan and sodium tripolyphosphate (TPP) in a mass ratio of7:1, at pH 5.8. Particle size distribution analysis and transmission electron microscopy (TEM) confirmedthe size ranging from 200 to 300 nm, while surface charge of nanoparticles ranged from 20 to 30 mV.Nanoparticles demonstrate to be safe without relevant cytotoxicity against retina pigment epithelium(ARPE-19) and human cornea cell line (HCE-T). The permeability study in HCE monolayer cell line showedan apparent permeability coefficient Pappof 3.41 ± 0.99 × 10−5and 3.24 ± 0.79 × 10−5cm/s for rosmarinicacid loaded chitosan nanopa...
