[Joint EFLM-COLABIOCLI recommendation for venous blood sampling].

This document provides a joint recommendation for venous blood sampling of the European federation of clinical chemistry and laboratory medicine (EFLM) Working Group for preanalytical phase (WG-PRE) and Latin American working group for preanalytical phase (WG-PRE-LATAM) of the Latin America confederation of clinical biochemistry (COLABIOCLI). It offers guidance on the requirements for ensuring that blood collection is a safe and patient-centered procedure and provides practical guidance on how to successfully overcome potential barriers and obstacles to its widespread implementation. The target audience for this recommendation are healthcare staff members directly involved in blood collection.

Joint EFLM-COLABIOCLI Recommendation for venous blood sampling.

This document provides a joint recommendation for venous blood sampling of the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM) Working Group for Preanalytical Phase (WG-PRE) and Latin American Working Group for Preanalytical Phase (WG-PRE-LATAM) of the Latin America Confederation of Clinical Biochemistry (COLABIOCLI). It offers guidance on the requirements for ensuring that blood collection is a safe and patient-centered procedure and provides practical guidance on how to successfully overcome potential barriers and obstacles to its widespread implementation. The target audience for this recommendation are healthcare staff members directly involved in blood collection.

Simultaneous determination of vitamins D2 and D3 by electrospray ionization LC/MS/MS in infant formula and adult nutritionals: First Action 2012.11.

A method was developed for the analysis of vitamins D2 and D3 in a variety of nutritional products. To extract vitamins D2 and D3 from products containing substantial amounts of fat, a saponification with alcoholic potassium hydroxide is required to release the vitamin D. Trideuterium-labeled vitamin D is added to the sample prior to saponification, and quantitation is achieved using linear regression of the ratio of peak response for 2H3-D and vitamin D.

Free and total carnitine in infant and adult/pediatric nutritional formulas by liquid chromatography/tandem mass spectrometry: first action 2012.17.

Data from a previously published study in J. AOAC Int. 91,130-142 (2008) was presented to the Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN) during the AOAC Annual Meeting held in Las Vegas, NV, from September 30 to October 3, 2012.

Simultaneous determination of vitamins D2 and D3 by LC-MS/MS in infant formula and adult nutritionals: First Action 2011.13.

During the "Standards Development and International Harmonization: AOAC INTERNATIONAL Mid-Year Meeting" held on June 29, 2011, an Expert Review Panel (ERP) on behalf of AOAC INTERNATIONAL adopted the method "Simultaneous Determination of Vitamins D2 and D3 by LC-MS/MS in Infant Formula and Adult Nutritionals" as an AOAC Official First Action method. Vitamins D2 and D3 are extracted from the sample using pentane-ether; the extract is collected and dried under nitrogen. Vitamin D is separated from interfering compounds using UPLC, and quantitated using tandem mass spectrometry (MS/MS).

Single-laboratory validation of a liquid chromatographic/tandem mass spectrometric method for the determination of free and total carnitine in infant formula and raw ingredients.

A reversed-phase liquid chromatographic/tandem mass spectrometric method was developed and validated for the determination of free carnitine (FC) and total carnitine (TC) in infant formula and raw ingredients. Preparation of samples for FC determination required only nonvolumetric dilution in water, followed by filtration. Determination of TC in whey-based samples required a common saponification procedure, which hydrolyzed the acylcarnitines to FC.

N-2-(azol-1(2)-yl)ethyliminodiacetic acids: a novel series of Gd(III) chelators as T2 relaxation agents for magnetic resonance imaging.

The synthesis, physicochemical properties, and toxicological implications of a novel series of N-2-(azol-1(2)-yl)ethyliminodiacetic acids, useful as contrast agents for magnetic resonance imaging are reported. Compounds were prepared by alkylation of methyl iminodiacetate with N-2-bromoethylazoles and subsequent hydrolysis. Stability constants of the corresponding Gd(III) complexes and T1 and T2 relaxivities were determined and interpreted in terms of optimized geometries obtained by semiempirical PM3 calculations.

Expression and characterization of phosphorylated recombinant human beta-casein in Escherichia coli.

Specific serine and threonine residues of recombinant human beta-casein produced in Escherichia coli were shown to be phosphorylated in vivo when human casein kinase II was coexpressed in the same plasmid. All of the phosphorylated forms found in the native protein were also detected in the recombinant protein. The phosphorylation of recombinant human beta-casein was confirmed by immunoblots, fast protein liquid chromatography, urea-polyacrylamide gel electrophoresis, SDS-polyacrylamide gel electrophoresis, and liquid chromatography-mass spectrometry.