30 documents found, page 1 of 3
One-step purification of L-asparaginase from cell extracts using carbon xerogels
Cristóvão, Raquel O.; Barros, Rita A. M.; Marramaque, Teresa P.; Aguiar, Gonçalo G.; Almeida, Mafalda R.; Carabineiro, Sónia A. C.L-asparaginase (ASNase, EC 3.5.1.1) is an enzyme with wide applications in the pharmaceutical sector and food processing industries. It is mainly used as a biotherapeutic for treating Acute Lymphoblastic Leukemia (ALL) and to reduce acrylamide formation in starchy compounds. Despite its relevance, current purification methods for microbial enzymes involve complex and expensive techniques. To overcome this drawb...
Plastic waste-derived carbon nanotubes: Influence of growth catalyst and cataly...
Roman, Fernanda; Silva, Adriano S.; Tuesta, Jose L. Diaz de; Baldo, Arthur P.; Lopes, Jessica P.M.; Gonçalves, Giane; Pereira, Ana I.; Praça, PauloLow-density polyethylene (LDPE) was used in this work to grow carbon nanotubes (CNTs) by chemical vapor deposition (CVD) over catalysts based on Ni, Fe and Al, synthesized either by co-precipitation (C) or wet impregnation (I) methods, with CNT yields in the range of 16–33 %. The morphology of the CNTs was directly influenced by the route used for the CVD catalyst synthesis, with co-precipitation-derived CVD ca...
Polyolefin and Polystyrene‐Derived Carbon Nanotubes: Catalysts for Oxidative De...
Roman, Fernanda; Batista, Maria C.; Silva, Adriano S.; Bezerra, Ana J.B.; Tuesta, Jose L. de Diaz de; Mambrini, Raquel V.; Silva, AdriánThe conversion of plastic solid waste into carbon nanotubes (CNTs) via chemical vapor deposition (CVD) and the effectiveness of these CNTs as catalysts for oxidative desulfurization (ODS) of a simulated fuel were investigated. The primary focus is on the use of CNTs synthesized from various polymer sources, including polyolefins and polystyrene (PS), to remove sulfur compounds using hydrogen peroxide (H 2 O2 ) ...
Recent developments and challenges in the application of fungal laccase for the...
Magalhães, Flávia F.; Pereira, Ana F. S.; Cristóvão, Raquel O.; Barros, Rita A. M.; Faria, Joaquim L.; Silva, Cláudia G.; Freire, Mara G.According to the European Environment Agency, the textile industry is responsible for 20% of global water pollution due to dyeing and finishing products, thus facing severe environmental challenges. It is essential to design more biocompatible and sustainable treatment processes capable of removing dyes from industrial wastewater to fight this environmental hazard. Chemical industries must change traditional ch...
Multi-walled carbon nanotubes as a platform for Immunoglobulin G attachment
Almeida, Mafalda R.; Barros, Rita A.M.; Pereira, Matheus M.; Castro, Daniel; Faria, Joaquim L.; Freire, Mara G.; Silva, Cláudia G.; Tavares, Ana P.M.Nanomaterials have been extensively used in different applications due to their peculiar characteristics and nanoscale dimensions. Among nanoparticles, carbon-based nanomaterials are becoming highly attractive for biomedical applications such as diagnosis, tissue engineering, drug delivery, and biosensing. The conjugation of carbon-based nanomaterials with antibodies combines the properties of these materials w...
Iridium–Iron Diatomic Active Sites for Efficient Bifunctional Oxygen Electrocat...
Yu, Zhipeng; Si, Chaowei; LaGrow, Alec P.; Tai, Zhixin; Caliebe, Wolfgang A.; Tayal, Akhil; Sampaio, Maria J.; Sousa, Juliana P. S.; Amorim, IsildaDiatomic catalysts, particularly those with heteronuclear active sites, have recently attracted considerable attention for their advantages over single-atom catalysts in reactions involving multielectron transfers. Herein, we report bimetallic iridium−iron diatomic catalysts (IrFe−N−C) derived from metal−organic frameworks in a facile wet chemical synthesis followed by postpyrolysis. We use various advanced cha...
Superior operational stability of immobilized l-asparaginase over surface-modif...
Almeida, Mafalda R.; Cristóvão, Raquel O.; Barros, Maria A.; Nunes, João C. F.; Boaventura, Rui A. R.; Loureiro, José M.; Faria, Joaquim L.Made available in DSpace on 2022-04-28T19:46:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-12-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Fundação para a Ciência e a Tecnologia; l-asparaginase (ASNase, EC 3.5.1.1) is an enzyme that catalyzes the l-asparagine hydrolysis into l-aspartic acid and ammonia, being mainly applied in pharmaceutical and food industries. However, some d...
Biomedical-related applications of functionalized nanomaterials
Almeida, Mafalda R.; Neves, Márcia C.; Morales-Torres, Sergio; Freire, Mara G.; Faria, Joaquim L.; Santos-Ebinuma, Valéria C. [UNESP]; Silva, Cláudia G.Made available in DSpace on 2022-04-28T19:50:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01; This chapter provides an overview of the use of nanoparticles in the biomedical field. Due to their unique properties, nanomaterials have enabled the development of innovative technologies within the biomedical field, making them a popular topic of research. Nanoparticles (NPs) can be prepared from a wi...
Carbon nanotubes for biomedical applications
Almeida, Mafalda R.; Nunes, João C. F.; Cristóvão, Raquel O.; Faria, Joaquim L.; Tavares, Ana P. M.; Silva, Cláudia G.; Freire, Mara G.Carbon nanotubes (CNTs) were discovered in 1991, and since then, have been one of the most intensely studied nanomaterials due to their improved functionalities and diversity of applications. Specifically, CNTs are entirely composed of carbon atoms connected through sp2 bonds structured in several condensed benzene rings rolled up into a cylinder form. Depending on the number of graphitic layers, CNTs can be cl...
Impact of atomic layer deposited TiO2 on the photocatalytic efficiency of TiO2/...
Oliveira, Inês; Silva, Ricardo M.; Rodrigues, Joana; Correia, Maria R.; Monteiro, Teresa; Faria, Joaquim L.; Silva, Rui F.; Silva, Cláudia G.Titanium oxide (TiO2) has been widely investigated as a photocatalytic material, and the fact that its performance depends on its crystalline structure motivates further research on the relationship between preparation methods and material properties. In this work, TiO2 thin films were grown on non- functionalized wave-like patterned vertically aligned carbon nanotubes (w-VA-CNTs) via the atomic layer depositio...