14 documents found, page 1 of 2

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Sugarcane straw hemicellulose extraction by autohydrolysis for cosmetic applica...

Pereira, Maria João; Pedrosa, Sílvia S.; Costa, Joana R.; Carvalho, Maria João; Neto, Tânia; Oliveira, Ana L.; Pintado, Manuela; Madureira, Ana Raquel

Sugarcane is a popular crop whose cultivation generates a wide range of by-products. The aim was to optimize the hydrothermal extraction of hemicellulose from sugarcane straw using response-surface methods with a two-factor composite design and to assess its functional qualities. Three process parameters were subject to optimization: solid/liquid ratio (1:6–1:18), temperature (143–186 °C), and extraction time (...


Porphyridium cruentum: a factory for the production of a new polysaccharide-bas...

Duarte, Marta M.; Suprinovych, Artem; Silva, Inês V.; Ramos, Oscar L.; Costa, Joana R.; Rojo, Luis; Oliveira, Ana L.

Marine algae and their metabolites have been widely recognized for their bioactive properties with applications in various industries, such as nutraceutical, cosmetical, and pharmaceutical. In this study, the best strategy for the extraction and processing of the exopolysaccharides (EPS) from Poryphydium cruentum for a laboratory scale was discussed, and the collected, purified EPS fraction was extensively char...


Fire-resistant bio-based polyurethane foams designed with two by-products deriv...

Capêto, Ana Paula; Amorim, Manuela; Sousa, Sérgio; Costa, Joana R.; Uribe, Braian; Guimarães, Ana Sofia; Pintado, Manuela; Oliveira, Ana L. S.

There is a growing interest in replacing conventional fossil-based polymers and composites with waste-based materials and fillers for environmental sustainability. This study designed water-blown polyurethane rigid foams using two by-products from the Amyris fermentation process of producing β-farnesene. The distillation residue (FDR) served as the main polyol component in the foam’s formulation (PF), supplemen...


Silica microparticles from sugarcane by-products as an encapsulation system for...

Costa, Joana R.; Costa, Ana Helena; Azevedo-Silva, João; Tavares-Valente, Diana; Sousa, Sérgio C.; Neto, Tânia; Pintado, Manuela E.

The encapsulation of retinol within silica microparticles has emerged as a promising opportunity in the realm of cosmetic and pharmaceutical formulations, driven by the need to reinforce the photoprotection and oxidation stability of retinol. This work examines the process of encapsulating retinol into silica microparticles. The association efficiency, microparticle size, molecular structure, morphology, oxidat...


Fire-resistant bio-based polyurethane foams designed with two by-products deriv...

Capêto, Ana Paula; Amorim, Manuela; Sousa, Sérgio; Costa, Joana R.; Uribe, Braian Esneider Buitrago; Guimarães, Ana Sofia; Pintado, Manuela

There is a growing interest in replacing conventional fossil-based polymers and composites with waste-based materials and fillers for environmental sustainability. This study designed water-blown polyurethane rigid foams using two by-products from the Amyris fermentation process of producing β-farnesene. The distillation residue (FDR) served as the main polyol component in the foam’s formulation (PF), supplemen...


Sugarcane straw as a source of arabinoxylans: optimization and economic viabili...

Costa, Joana R.; Pereira, Maria J.; Pedrosa, Sílvia S.; Gullón, Beatriz; Carvalho, Nelson M. de; Pintado, Manuela E.; Madureira, Ana Raquel

Sugarcane processing produces a significant amount of byproducts in the form of straw and bagasse, which are rich in cellulose, hemicellulose, and lignin. This work aims to provide a valorization approach to sugarcane straw by optimizing a two-step alkaline extraction of arabinoxylans by a response surface methodology to evaluate a potential industrial-scale production. Sugarcane straws were delignified using a...


Valorization of sugarcane by-products through synthesis of biogenic amorphous s...

Costa, Joana R.; Capeto, Ana Paula; Pereira, Carla F.; Pedrosa, Sílvia S.; Mota, Inês F.; Burgal, João da Silva; Pintado, Ana I.; Pintado, Manuela E.

Ashes from sugarcane by-product incineration were used to synthesize silica powders through alkaline hot extraction, followed by ethanol/acid precipitation or the sol–gel method. Both production methods allowed amorphous spherical silica microparticles with sizes ranging from 1–15 μm and 97% purity to be obtained. Water absorption ranged from 135–155 mL/100 g and 150–250 mL/100 g for precipitated silica and sil...


Sugarcane-derived biogenic silica particles as a topical delivery system for re...

Costa, Joana R.; Costa, Ana Helena; Azevedo-Silva, João; Pintado, Manuela E.; Madureira, Ana Raquel


Polymeric nanoparticles as oral delivery systems for a grape pomace extract tow...

Costa, Joana R.; Xavier, Miguel; Amado, Isabel R.; Gonçalves, Catarina; Castro, Pedro M.; Tonon, Renata V.; Cabral, Lourdes M.C.; Pastrana, Lorenzo

Grape pomace (GP) is a major by-product from the wine industry, known for its bioactive compounds and their impact upon gastrointestinal (GI) health. However, bioaccessibility is often poor due to their degradation during digestion. This work aimed to encapsulate bioactive GP extract (GPE) into chitosan (CS) and alginate (Alg) nanoparticles (NPs) to mitigate degradation in the GI tract. Alg and CS NPs were opti...


Fortification of coconut water with microencapsulated grape pomace extract towa...

Costa, Joana R.; Monteiro, Maria João; Tonon, Renata V.; Cabral, Lourdes M.C.; Pastrana, Lorenzo; Pintado, Manuela E.

A bioactive grape pomace extract (GPE) rich in polyphenols was encapsulated into alginate (GPE-Alg) or chitosan (GPE-CS) microparticles, later incorporated into coconut water. Biological and sensory properties were evaluated. Storage was performed at 4 ˚C followed by quality assessment. Evaluation of coconut water after gastrointestinal digestion on the growth pathogens and probiotic bacteria showed that the fo...


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