Food Science, Colloid and Surface Chemistry, Materials Science
9
Scopus Publications
Scopus Publications
Grape Pomace Rich-Phenolics and Anthocyanins Extract: Production by Pressurized Liquid Extraction in Intermittent Process and Encapsulation by Spray-Drying Jessica Thaís do Prado Silva, Millene Henrique Borges, Carlos Antonio Cardoso de Souza, Carmen Sílvia Fávaro-Trindade, Paulo José do Amaral Sobral, Alessandra Lopes de Oliveira, and Milena Martelli-Tosi MDPI AG A considerable number of grape pomaces are generated annually. It represents a rich source of bioactive compounds, such as phenolic compounds and anthocyanins. Pressurized liquid extraction (PLE) has emerged as a green technology for recovering bioactive compounds from vegetal matrixes. In our study, PLE parameters (temperature, number of cycles, and rinse volume) have been studied to produce grape pomace extracts with high bioactive content using an experimental design. The experimental data obtained were adjusted to linear and quadratic models. The first-order model was better in predicting anthocyanins contents (TA, R2 = 0.94), whereas the second-order model was predictive for total phenolic compounds (TPC, R2 = 0.96). The main process parameter for the recovery of bioactive compounds was temperature, and the results showed opposing behaviors concerning TPC and TA, as it is difficult to optimize conditions for both. The extract containing the higher concentration of TPC (97.4 ± 1.1 mg GAE/g, d.b.) was encapsulated by spray-drying using maltodextrin as wall material. Particles presented with a spherical shape (~7.73 ± 0.95 μm) with a recovery yield of 79%. The results demonstrated that extraction followed by encapsulation of grape pomace extract is a good strategy to simplify future applications, whether for food, cosmetics or pharmaceutical fields.
Whey protein isolate microgel properties tuned by crosslinking with organic acids to achieve stabilization of pickering emulsions Jéssica Thaís do Prado Silva, João Vitor Munari Benetti, Taís Téo de Barros Alexandrino, Odilio Benedito Garrido Assis, Jolet de Ruiter, Karin Schroën, and Vânia Regina Nicoletti MDPI AG Whey protein isolate (WPI) can be used effectively to produce food-grade particles for stabilizing Pickering emulsions. In the present study, crosslinking of WPI microgels using organic acids (tannic and citric acids) is proposed to improve their functionality in emulsions containing roasted coffee oil. It was demonstrated that crosslinking of WPI by organic acids reduces the microgels’ size from ≈1850 nm to 185 nm and increases their contact angle compared to conventional WPI microgels, achieving values as high as 60°. This led to the higher physical stability of Pickering emulsions: the higher contact angle and smaller particle size of acid-crosslinked microgels contribute to the formation of a thinner layer of particles on the oil/water (O/W) interface that is located mostly in the water phase, thus forming an effective barrier against droplet coalescence. Particularly, emulsions stabilized by tannic acid-crosslinked WPI microgels presented neither creaming nor sedimentation up to 7 days of storage. The present work demonstrates that the functionality of these crosslinked WPI microgels can be tweaked considerably, which is an asset compared to other food-grade particles that mostly need to be used as such to comply with the clean-label policy. In addition, the applications of these particles for an emulsion are much more diverse as of the starting material.
Nanoencapsulation of lutein and its effect on mice's declarative memory Jéssica Thaís do Prado Silva, Júlia Maria Tonin Geiss, Sara Marchesan Oliveira, Evelyne da Silva Brum, Sara Cristina Sagae, Daniela Becker, Fernanda Vitória Leimann, Rafael Porto Ineu, Gustavo Petri Guerra, and Odinei Hess Gonçalves Elsevier BV