CCQM-K125 was organized by the Inorganic Analysis Working Group (IAWG) of CCQM to assess and document the capabilities of the national metrology institutes (NMIs) or the designated institutes (DIs) to measure the mass fractions of trace elements (K, Cu and I) in infant formula. Government Laboratory, Hong Kong SAR (GLHK) acted as the coordinating laboratory. In CCQM-K125, 25 institutes submitted the results for potassium, 24 institutes submitted the results for copper and 8 institutes submitted the results for iodine. For examination of potassium and copper, most of the participants used microwave-assisted acid digestion methods for sample dissolution. A variety of instrumental techniques including inductively coupled plasma mass spectrometry (ICP-MS), isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS), inductively coupled plasma optical emission spectrometry (ICP-OES), atomic absorption spectrometry (AAS), flame atomic emission spectrometry (FAES) and microwave plasma atomic emission spectroscopy (MP-AES) were employed by the participants for determination. For analysis of iodine, most of the participants used alkaline extraction methods for sample preparation. ICP-MS and ID-ICP-MS were used by the participants for the determination. Generally, the participants' results of CCQM-K125 were found consistent for all measurands according to their equivalence statements. Except with some extreme values, most of the participants obtained the values of di /U(di ) within ± 1 for the measurands. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Functional breads constitute an interesting alternative as a vehicle of new essential fatty acid sources. The aim of this study was to improve the fatty acids profile of breads replaced with mixtures of three flours and to analyse the effect of their use on texture parameters, colour and technological characteristics of these products. Wheat flour (WF) was replaced with mixtures of soybean flour (SF), flaxseed flour (FF) and wheat bran (WB). A multilevel factorial design with 3 factors (FF, SF and WB) and 3 levels (0 g/Kg WF -8 g/KgWF-16 g/Kg WF) were applied; being bread without flour replacement, the control sample. The content of saturated fatty acids (SFA) decreased with increasing concentration of FF, while the content of polyunsaturated fatty acids (PUFA) tended to increase at higher contents of SF and FF. The breads substituted with the highest concentration of FF in mixtures FF+SF or FF+WB showed the highest of n3 fatty acid content. Specific volume of breads with the blends FF+SF and FF+WB showed no significant differences with control (p<0.05). The samples with 16 g/kg FF+16 g/kg WB and with 16 g/Kg FF+8 g/Kg SF were selected for high content n3 and good specific volume. These breads presented harder crumb, less cohesiveness and more chewiness. Colour crumb was more reddish in bread with FF+WB, more yellowish in bread with FF+SF, and both lesser luminous than the control. Although these selected formulations provided breads with high content n3, their crumbs were darker and harder than wheat flour bread.
The 2017 CCQM-K147 "Comparison of value-assigned CRMs for niacin (vitamin B3) in milk powder and infant formula matrices" is the first Key Comparison directly testing the chemical measurement services provided to customers by National Metrology Institutes (NMIs) and Designated Institutes (DIs) through certified reference materials (CRMs). CRMs certified for vitamin B3 (as niacin or niacinamide) content in milk powder and infant formula matrices were compared using measurements made on these materials under repeatability conditions. Five NMIs/DIs submitted seven CRMs certified for niacinamide and two CRMs certified for niacin. These materials represent most of the higher-order reference materials available in 2017 for this important nutrimental measurand. Generalized Gauss Markov Regression (GGMR) and Bayesian methods were used to establish the Key Comparison Reference Function (KCRF) relating the CRM certified values to the repeatability measurements. The niacinamide and niacin results for all nine CRMs were deemed equivalent at the 95 % level of confidence and were used to define the KCRF for vitamin B3 (as niacinamide). Monte Carlo methods and Bayesian methods were used to estimate 95 % level-of-confidence coverage intervals for the relative degrees of equivalence of materials, %d ± U95 (%d), and of the participating NMIs/DIs, %D ± U95 (%D). The Bayesian method estimates were selected as the final DoE values. For the niacinamide and niacin materials, all of the %D ± U95(%D) intervals, were within (-10 to 10) % of the consensus results and all of these are statistically equivalent. These results demonstrate that the participating institutions can value-assign CRMs for niacinamide and/or niacin in milk powder and infant formula matrices. KEY WORDS FOR SEARCH Niacin, Niacinamide, milk, infant formula, CRMs Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
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