Percorrer por autor "boutoub, Oumaima"
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- Euphorbia resinifera: chemical composition and biological properties (short review)Publication . boutoub, Oumaima; Ghadraoui, Lahsen El; Miguel, Maria da GraçaThis review updates the information on the chemical composition of E. resinifera (spurge resin) latex and its biological properties, as well as those from the aerial parts and bee products (honey and propolis), generally without latex. From such review and according to the studies developed so far, it was possible to confirm that the chemical composition of latex and non-latex compounds differs. In the latex, diterpenes, nor sesquiterpenes, triterpenes, and serine proteases (EuRP-61) with 61 kDa predominate despite other minor compounds. The identified protease had anticoagulant, antiplatelet, and peripheral blood cell aggregation inhibitory properties. Phenolics, including flavonoids and tannins, have antioxidant activity and are dominant in the aerial parts of E. resinifera. Phenolic acids and flavonoids, particularly flavanones, flavones, and flavonols and their glycosides, were identified in the spurge resin honey. Generally, honey samples were within the acceptable limit of international standards. Antioxidant activity was reported for this monofloral honey. Antimicrobial activity was also detected in hydroalcoholic extracts of propolis.
- On the optimization of carob seed peel extraction using aqueous-based acidic systemsPublication . Medronho, Bruno; boutoub, Oumaima; Duarte, Hugo; Aliaño González, María José; Guerra, Rui; Brazio, António; Gonçalves, Sandra; Romano, AnabelaCarob fruit utilization remains limited, with most of their commercial value derived from locust bean gum, which is obtained from seed endosperm. Efficient extraction requires dehusking, which is traditionally performed under harsh conditions. This study aims to develop and optimize a milder, more sustainable dehusking method while preserving seed quality for industrial applications. Various aqueous-based solvents were tested, leading to the selection of metanesulfonic acid (CH4O3S). A Box-Behnken design with response surface methodology optimized the process, using husk removal efficiency as the response variable. The optimized conditions were 24.5 g of seeds treated in 50 mL of a solvent mixture (41% CH4O3S and 59% H2SO4) at 90 degrees C for 10 min, followed by washing by 5 min with water (87 mL). The treated seeds were analyzed using colorimetry assays and diffusive reflectance spectroscopy and benchmarked against both pristine and dehusked seeds from a local company. The resulting seeds remained morphologically intact and exhibited appealing color characteristics comparable to commercial samples. The optimized method ensured intact seed morphology and color characteristics comparable to commercial standards, offering a viable alternative to conventional H2SO4-based dehusking. Furthermore, this study also highlights for the first time the effectiveness of diffusive reflectance spectroscopy as a rapid and straightforward tool for assessing the dehusking process.