Abstract

Anemia is one of the most common disorders in the world generated by multiple causes. Despite a good understanding of the causes of anemia, there is still uncertainty about how best this should be investigated, prevented and managed. This reflects the limitations of laboratory tests, as well as the poor understanding of the complex physiological mechanisms. A better understanding of the nature of anemia and the changes in erythrocytes may provide new strategies to benefits of patients. In this study, it was identified by flow cytometric and SEM analysis, the morphological changes of forms that deviate from the classical discoid shape, which had an increase in the mean fluorescence intensity of calcein (erythrocyte viability measured by the level of intracellular esterase activity with the Calcein-AM method). The results obtained for RBCs from the patients with different types of anemia did not demonstrate a massive phosphatidylserine externalization measurable with Annexin-V-FITC compared to the values for normal erythrocytes. The present study provides that flow cytometric analysis can be a quick and efficient method for diagnosing in haematological diseases and monitoring and in the medical biotechnology industry in order to develop drugs to treat anemia.

Abstract

Abstract

Abstract

In this paper, we present the fabrication and characterization of new chitosan-based membranes while using a new biotechnology for immobilizing alkaline phosphatase (ALP). This technology involved metal ions incorporation to develop new biopolymeric supports. The chemical structure and morphological characteristics of proposed membranes were evaluated by infrared spectroscopy (FT-IR) and the scanning electron microscopy technique (SEM). The inductively coupled plasma mass spectrometry (ICP-MS) evidenced the metal ion release in time. Moreover, the effect of Mg2+ on the enzymatic activity and the antibacterial investigations while using Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria, hemolysis, and biocompatibility behavior were studied. Immobilizing ALP into the chitosan membranes composition followed by the incorporation of Mg2+ led to polymeric supports with enhanced cellular viability when comparing to chitosan-based membranes without Mg2+. The results obtained evidenced promising performance in biomedical applications for the new biopolymeric supports that are based on chitosan, ALP, and metal ions.

Abstract

Abstract

Abstract

Abstract

Abstract

The paper refers to a bioactive matrix in membrane shape, with a thickness of 0.5 - 1.0 mm, and consisting of gelatine, chitosan, and α-chymotrypsin, with or without addition of glutaraldehyde as a cross-linking agent. The bioproduct is a biomaterial with biomedical applications as biocompatible membrane with anti-inflammatory action due to coupling of the proteolytic enzyme. Bioproducts have complex implications in the treatment of traumatized tissue, accelerating the pus cleansing of infected wound, blood clots and other cellular debris, secretions liquefaction and cleansing of necrotic tissue, and also stimulating tissue regeneration and a faster healing of open infected wounds. In order to establish the influence of cross- linking process and membrane’s thickness on mechanical properties, ultrastructural studies were carried out on obtained biomaterials by electron microscopy analysis. To demonstrate the biological qualities of new enzymatic biomaterials, the membrane’s biological effect was analyzed in a cell culture model (mouse fibroblasts NCTC). © 2014 Vasile Goldis University Press.

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract