Use of a Simple Fabrication Process to Produce a Biosensor： The 3-Hydroxybutyrate Dehydrogenase Case

This study was aimed to construct a biodegradable but reliable 3-β-hydroxybutymte biosensor. In this context a versatile paper based biosensor, quickly, easily and cheaply fabricated is reported. The procedure of fabrication is based on the assumption that the introduction of the enzyme in the carbon ink will allow enzyme stabilization and facilitate the study of the catalysis of enzymes and the detection of substrates. To prove this concept we use the enzyme 3-hydroxybutyrate dehydrogenase, in aqueous solution. This enzyme was chosen because it catalyzes the 3-β-hydroxybutyrate, which results from ketoacidosis. The quantification this substance in the diabetics＇ blood is very important as it can increase the reliability of the diagnosis of glycaemia. To prove the multi-use of this biosensor we not only study the redox process in steady state and during the catalytic process, but also detected and quantify the 3-β-hydroxybutyrate. Our results showed that it was possible to study the redox process that occurred during the catalysis and to confirm the amino acid residues that participate in it. It was also observed that glucose and ascorbic acid can interfere in the detection and quantification of the 3-β-hydroxybutyrate, what should be in mind when the quantification of the 3-β-hydroxybutyrate is made in blood samples.

Laboratory Indicators and Some Considerations in Albanian Patients with Beta Thalassemia Major and Sickle Cell Disease

Haemoglobinopathies are very serious clinical conditions caused by genetic mutations. They belong to autosomal recessive disorders and the most frequent genetic inherited diseases seen, specifically and above all among Mediterranean countries. Thalassaemia syndromes (included Beta Thalassaemia and Sickle Cell Disease) have been the first diagnosed diseases since in intrauterine life using reccombinant DNA techniques. So, the better understanding of their pathophysiology has given a spectacolar improvement and a considerable impact on these conditional managements. Every year there are nearly 300,000 children born with haemoglobinopathies globally, and there are 60,000 - 70,000 children with Beta Thalassemia among them. Nowadays in Albania like everywhere, there is a significant increase of survival in these patients. As a result of life longevity and improvement of patients life quality, we can see that these patients may suffer from other concomitant illnesses. In our country, there are registered approximately 500 patients with haemoglobinopathies. We studied 50 pediatric patients at random ranging from age 2 until 18 years old. We excluded other pathologies among them. We found high values of biochemical indicators in blood (Ca 15-3 was found elevated in 75% of our patients, Lactate Dehydrogenases was found elevated in 70% of cases, Indirect Bilirubin was found elevated in 66% of cases). All three parameters are indicators of hemolysis. We found a correlation between high values of Ca 15-3 marker and high levels of LDH, Indirect Bilirubin and low level of hemoglobin (p < 0.05). Ca 15-3 is much elevated among patients non regularly transfused and in those who take an unsufficient amount of blood. Continuous monitoring of these biochemical parameters is going to help in the more effective follow up of patients with haemoglobinopathies.