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PubMedDate not supplied

[Interaction of human blood plasma proteins with glycosaminoglycans].

Binding of human blood plasma proteins with hyaluronic acid, chondroitin-4-SO4 and heparin was studied. Chondroitin-4-SO4 was not involved in the reaction, whereas heparin and hyaluronic acid formed complexes with the proteins at very low concentrations. The intensity of binding correlated with concentration of carbohydrates in blood plasma proteins. Heparin displaced hyaluronic acid in the complexes. Biological importance of the interactions between glycosaminoglycans and glycoproteins, incorporated into blood plasma as well as into cell membranes of various tissues, is discussed.

Blood Proteins↗
PubMed1993

[Certain functional characteristics of enzymatic antioxidant defense in human blood plasma].

It has been shown that human blood plasma displays a low activity of superoxide dismutase, a key enzyme of antioxidative protection. This enzyme was isolated and purified from human blood plasma by using a novel procedure based on gel filtration on Ultrogels AcA-34 and AcA-44. Data from gel filtration and disc electrophoresis in the presence of sodium dodecyl sulfate and beta-mercaptoethanol suggest that the molecular mass of the enzyme decreased with time and a simultaneous change in activity. Purification of superoxide dismutase from blood plasma revealed the presence of low molecular mass peptides (1000 and 5000 Da) which inhibited the enzyme activity. A possibility was considered for superoxide dismutase transition into an active, conformationally labile state after a split-off of the inhibiting fragment under conditions of oxidative stress.

Antioxidants↗
PubMedDate not supplied

[Determination of fibrinogen concentration in blood plasma by the sulfite precipitation method].

Two methods using thrombine and sulfite were compared for estimation of fibrinogen concentration in blood plasma. Both methods produced the same results in estimation of fibrinogen in donor blood plasma. If blood plasma contained high amount of products of fibrinogen and/or fibrin degradation, the efficiency of thrombin method was decreased; on the other hand, final concentration of sulfite did not precipitate fragment D of fibrinogen from human blood plasma. Presence of heparin did not influence on the sulfite method but the polysaccharide might interfere in the thrombin method. Some experiments require to use both these methods for evaluation of fibrinogen in blood plasma.

Fibrinogen↗
PubMed1994

Internal temperature calibration for 1H NMR spectroscopy studies of blood plasma and other biofluids.

A method for temperature calibration of human blood plasma and cerebrospinal fluid (CSF) samples inside a high resolution NMR spectrometer is presented. This calibration is based on the temperature dependence of the chemical shift difference between the water signal and that from the H-1 proton of endogenous alpha-glucose or, in some circumstances, beta-glucose. This dependence can be fitted using a second-order polynomial equation and functions for both human blood plasma and human CSF are given. Similar graphs could easily be generated for other fluids. The blood plasma calibration appears to be accurate to +/- 0.9 K in test samples. The use of the blood plasma calibration graph has also been evaluated using the 1H NMR spectra of CSF and shown to overestimate the CSF internal temperature by ca 1.3 K. This approach should have a general applicability to blood plasma and CSF samples from normal and pathological situations or from other species, because there are unlikely to be large changes in ionic strength or pH even in disease states. Knowledge of the exact internal temperature of plasma samples is likely to be of particular importance in the investigation of lipid and lipoprotein interactions because of the significant temperature dependence of lipid and lipoprotein NMR linewidths in such samples.

Body Fluids↗
PubMed2004

Some components of oxidative-antioxidative system in human blood plasma and serum.

Comparison of the concentrations and activities of components in the oxidative-antioxidative system between blood plasma and serum. Blood plasma and serum samples were obtained from 38 healthy adults to evaluate malondialdehyde concentration, the total antioxidative capacity, superoxide dismutase activity, protein and non-protein sulphydryl groups, ascorbate, haemoglobin, methaemoglobin and protein. Blood plasma shows higher activity of superoxide dismutase, as well as higher concentrations of low-molecular sulphydryl groups and ascorbate, when compared to those in blood serum. The total plasma antioxidative capacity is also higher than that assessed in blood serum. Processes of blood coagulation and blood clot retraction lead to antioxidant consumption. The evaluation of oxidative-antioxidative system for diagnostic purposes should be performed in blood plasma.

Adult↗