To the Editor: The use of primary protein reference material CRM 470/RPPHS (1) was intended to lead to reduced method-dependent variation in specific protein analyses. Observations from UK NEQAS for Specific Proteins indicate that this is true for most proteins, but not for ceruloplasmin. Because the measurement of ceruloplasmin is an important part of the initial screening procedure for Wilson...

Two thromboplastin reagents ("Thrombotest" and "Normotest Automated") were used in evaluation of an automated method for determination of prothrombin time based on turbidimetric measurement of clot formation in a centrifugal analyzer. We used 60 plasma samples from patients with various diseases or being treated with oral anticoagulant and 16 normal plasma samples. Prothrombin times were calcul...

OBJECTIVE To evaluate the influence of supplementation with retinyl palmitate in the immediate postpartum period on the levels of secretory immunoglobulin A (SIgA) in colostrum. METHODS A clinical trial was conducted among 96 recently-delivered mothers treated at a public maternity hospital, divided into control group, which was not supplemented (n = 44), and test group, supplemented on the f...

OBJECTIVE Clinical assessment of the SPAPLUS® system for the determination of the serum free light chains kappa (κ FLC) and lambda (λ FLC) compared to the BNII®. DESIGN AND METHODS 126 serum specimens from our routine activity were analysed on two different analysers: the BNII® (immunonephelometry, Siemens) and the SPAPLUS® (turbidimetry, Binding Site). We compared the absolute values of the ...

The formation of polyelectrolyte complexes between carboxymethylcellulose and N-methylated poly(2-vinylpyridine), at a nonstoichiometric mixing ratio, was studied. Various methods, such as viscometry, turbidimetry, electrophoresis, and optical spectroscopy, were used to investigate the complexes with respect to their composition, structure, and stability in aqueous systems of different ionic st...

Turbidimetry, dynamic light scattering, and capillary electrophoresis were used to study the complexation of polydiallyldimethylammonium chloride (PDADMAC) with mixed micelles of sodium dodecyl sulfate (SDS) and dodecanol ethoxylates (C12En). The effect of EO chain length and its distribution was examined using various combinations of C12En (n = 4, 6, 8, 12). The results show that the onset of ...

Microbial pollution in aquatic environments is one of the crucial issues with regard to the sanitary state of water bodies used for drinking water supply, recreational activities and harvesting seafood due to a potential contamination by pathogenic bacteria, protozoa or viruses. To address this risk, microbial contamination monitoring is usually assessed by turbidity measurements performed at d...

Abstract Background Rifaximin, a semi-synthetic antimicrobial, does not present microbiological method described in official compendia, and there is lack of literature on this topic. The quality control antimicrobials extremely important to evaluate the real potency pharmaceutical products. Objective A miniaturized turbidimetric for determining rifaximin tablets was developed validated by turbi...

The aim of this work was to study the potential application edible films obtained by complex coacervation promoted electrostatic interactions between positively charged chitosan (CH) 3% (w/w) and negatively whey protein isolate (WPI) (w/w). Preliminary assays turbidimetry were made in order find optimal CH-to-WPI mass ratio for coacervation. maximum turbidity CH:WPI 0.1:1 dispersions CH/WPI (bo...