An intracellular glucose oxidase was isolated from the mycelium extract of a locally isolated strain of Aspergillus niger UAF-1. The enzyme was purified to a yield of 28.43% and specific activity of 135 U mg(-1) through ammonium sulfate precipitation, anion exchange and gel filtration chromatography. The enzyme showed high affinity for D-glucose with a Km value of 2.56 mM. The enzyme exhibited ...

Health benefits of honey have been reported in a variety of conditions including microbial infections, wound healing, inflammation, glucose tolerance and analgesia. Honey is a supersaturated sugar solution mainly comprised of D-fructose, D-glucose, sucrose, maltose and higher sugars (~80% of solid mass). While other natural products i.e. alkaloids, flavonoids/isoflavones, glycosides, phenolics,...

Neuroblastoma cells can acquire resistance mechanisms that make them invulnerable to chemotherapeutic agents. The use of nanoparticles as drug carriers provides the possibility deliver several drugs simultaneously specific tumoral cell populations, improving their therapeutic outcome. Herein, development a multifunctional nanoplatform based on assembly protocells (PC) and polymeric nanocapsules...

In the presence of high glucose concentration (16.7 mM), pancreatic islets show increased activities of superoxide dismutase (SOD) and glutathione peroxidase (GSHPx). This activation may be a result of reactive oxygen species (ROS) stimulation, which is generated during glucose metabolism. NAD(P)H oxidase is mainly responsible for ROS production by phagocytic cells but its isoforms have been fo...

Endothelin-1 (ET-1) is a pluripotent mediator that modulates vascular tone and influences the inflammatory response. Patients with inflammatory lung disorders frequently have elevated circulating ET-1 levels. Because these pathophysiological conditions generate reactive oxygen species that can regulate gene expression, we investigated whether the level of oxidant stress influences ET-1 producti...

The present work describes a comparative study involving two sequential injection enzymatic procedures for the spectrophotometric determination of glucose in milk samples. The determinations were based on the use of the enzymes, glucose oxidase and peroxidase, in solution or immobilized, and 4-aminophenazone and phenol as chromogenic reagents. In the first procedure, 8.4 IU of glucose oxidase a...

Glucose in the cerebrospinal fluid (CSF) of neonates, as measured with a kinetic glucose oxidase/peroxidase procedure, was sometimes very low. When these samples were stored at 4 degrees C and subsequently re-analyzed, or if the samples were analyzed at any time after receipt by using a glucose dehydrogenase assay, the values were much higher. We found that the discrepancies in the values were ...