Authors:Young Sang Kwon, Sung-Gil Choi, Seung-Min Lee, Jong-Hwan Kim, and Jong-Su Seo
PCDD/Fs (EPA 1613 CS1 to CS5, LCS, and ISS) were certified purchases from Wellington Laboratories Inc. (Guelph, Ontario, Canada) and were used for the development of the analytical methodology. Certifiedreferencematerial (CRM) samples including BCR
The laboratory for instrumental neutron activation analysis at the Reactor Institute Delft, Delft University of Technology
uses a network of 3 gamma-ray spectrometers with well-type detectors and 2 gamma-ray spectrometers with coaxial detectors,
all equipped with modern sample changers, as well as 2 spectrometers with coaxial detectors at the two fast rabbit systems.
A wide variety of samples is processed through the system, all at specific optimized (and thus different) analytical protocols,
and using different combination of the spectrometer systems. The gamma-ray spectra are analyzed by several qualified operators.
The laboratory therefore needs to anticipate on the occurrence of random and systematic inconsistencies in the results (such
as bias, non-linearity or wrong assignments due to spectral interferences) resulting from differences in operator performance,
selection of analytical protocol and experimental conditions. This has been accomplished by taking advantage of the systematic
processing of internal quality control samples such as certified reference materials and blanks in each test run. The data
from these internal quality control analyses have been stored in a databank since 1991, and are now used to assess the various
method performance indicators as indicators for the method’s robustness.
Authors:E. Schall, Zs. Bugyi, L. Hajas, K. Török, and S. Tömösközi
Quantitation of gluten in gluten-free products is a great challenge as it is hindered by several factors including the lack of certified reference materials. To resolve this problem, our research group, in cooperation with other international experts, started a series of experiments with the goal of the production of a suitable gluten reference material. As a part of this research, several different wheat cultivars and their isolated gluten proteins were characterized by different methods, including enzyme-linked immunosorbent assay (ELISA). However, we need to know the performance of the ELISA methods used for this special area of research. During the present work we investigated the accuracy and precision of two different ELISA methods for our own laboratory conditions and special sample matrices (wheat flours and gliadin isolate). We have found that the tested performance characteristics of the methods seem to be appropriate on a case-by-case basis, but the long-term measurement uncertainty is higher, which makes it difficult to evaluate the results obtained with the ELISA method for these types of samples.
Authors:Akifumi Eguchi, Takeshi Enomoto, Norimichi Suzuki, Miho Okuno, and Chisato Mori
= 7) of certifiedreferencematerial (SRM 1957).
Passing–Bablok regression [ 17 ] and Pearson's correlation coefficients were used to investigate the agreement between the original
Authors:D. Trbović, T. Polak, L. Demšar, N. Parunović, M. Dimitrijević, D. Nikolić, and V. Đorđević
their reproducibility limits and make recommendation for their use in laboratory practice [ 41 , 42 ], to evaluate and possibly improve analytical methods or laboratory performance, or to certifyreferencematerials [ 43 – 45 ]. Due to the heterogeneity
Authors:Elise Ivarsen, Christoffer P. Andersen, Sabine M. Jensen, Carsten T. Pedersen, and Anders K. Svaneborg
iron and zinc, the accuracy of the methods was further tested by analysis of certifiedreferencematerial for food element analysis, brown rice flour NMIJ CRM7532-A, the reference material had a mean recovery of 101% ( n = 16) for iron and 97% ( n