Development of a new tetrandrine certified reference material for clinical chemistry and pharmaceutical analysis

2015 ◽  
Vol 7 (11) ◽  
pp. 4763-4768 ◽  
Author(s):  
Dezhi Yang ◽  
Fengfeng Wang ◽  
Li Zhang ◽  
Yang Lv
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Certified Reference Material ◽  
Pharmaceutical Analysis ◽  
Certified Reference Materials ◽  
Clinical Chemistry ◽  
Reliability And Validity ◽  
Metrological Characteristics ◽  
Analytical Measurements

Certified reference materials (CRMs) with good metrological characteristics are essential tools to guarantee the reliability and validity of analytical measurements.

Experience with Certified Reference Material Proficiency Testing for Quality Control of Wheat

1998 ◽  
Vol 6 (A) ◽  
pp. A53-A61
Author(s):  
Judit Budai ◽  
Judit Fükó
Keyword(s):  
Quality Control ◽  
Reference Material ◽  
Proficiency Testing ◽  
Reference Materials ◽  
Certified Reference Material ◽  
Certified Reference Materials ◽  
Long Term Stability ◽  
Determining Factors ◽  
Chemical Section

The Chemical Section of OMH1,2 embarked on the preparation of a series of wheat samples as Certified Reference Materials (CRMs) in 1992. The certification processes were carried out according to the recommendations of ISO. Since then we have developed a series of flour samples as well. The investigations of the long-term stability and the application of wheat and flour CRMs are continuous. Wheat is one of the most widely grown crops in Hungary and it is one of the major determining factors of the economy. Its uniform and objective qualification is of great importance. There are well-equipped laboratories available with sufficient experience but, as the proficiency testing regularly showed, certified samples need to be used to achieve exact and uniform measuring results.

scholarly journals Preparation of certified reference materials for cotton fabric’s dye transfer inhibition performance test of household washing machines

2020 ◽  
Vol 15 ◽  
pp. 155892502094116 ◽  
Author(s):  
Mingqi Guo ◽  
Yun He ◽  
Li Jiang ◽  
Qingbo Yang ◽  
Jianli Liu ◽  
...  
Keyword(s):  
Reference Material ◽  
Cotton Fabric ◽  
Reference Materials ◽  
Certified Reference Material ◽  
Performance Test ◽  
Certified Reference Materials ◽  
Dye Transfer ◽  
Washing Machines ◽  
Dyed Fabric ◽  
Transfer Inhibition

At present, many well-known brands of washing machines in the market are equipped with dye transfer inhibition washing procedures. However, there is no standardized sample available for the evaluation of the dye transfer inhibition washing procedure, and there is no comparability and access standard of the high-quality washing machine with the related functions. In this article, the certified reference materials for the evaluation of the dye transfer inhibition function will be prepared, which consist of certified reference material of white cotton fabric and that of dyed cotton fabric. The certified reference material of white fabric is made of bleached plain fabric, and that of dyed fabric is made with different reactive red dyes and dyeing processes. The size and manufacturing process of the whole set of standardized samples for the evaluation of dye transfer inhibition are selected and determined through experiments. The preparation of the standardized sample for the evaluation of dye transfer inhibition will improve the research and design of the functional washing procedure, which can better solve the pain point when dark and light clothes are washed together.

scholarly journals Development and certification of a reference material for zearalenone in maize germ oil

2021 ◽  
Author(s):  
Juliane Riedel ◽  
Sebastian Recknagel ◽  
Diana Sassenroth ◽  
Tatjana Mauch ◽  
Sabine Buttler ◽  
...  
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Mass Fraction ◽  
High Performance ◽  
Certified Reference Materials ◽  
Maximum Level ◽  
Whole Process ◽  
Commission Regulation ◽  
Maize Oil ◽  
Maize Germ

AbstractZearalenone (ZEN), an estrogenic mycotoxin produced by several species of Fusarium fungi, is a common contaminant of cereal-based food worldwide. Due to frequent occurrences associated with high levels of ZEN, maize oil is a particular source of exposure. Although a European maximum level for ZEN in maize oil exists according to Commission Regulation (EC) No. 1126/2007 along with a newly developed international standard method for analysis, certified reference materials (CRM) are still not available. To overcome this lack, the first CRM for the determination of ZEN in contaminated maize germ oil (ERM®-BC715) was developed in the frame of a European Reference Materials (ERM®) project according to the requirements of ISO Guide 35. The whole process of CRM development including preparation, homogeneity and stability studies, and value assignment is presented. The assignment of the certified mass fraction was based upon an in-house study using high-performance liquid chromatography isotope dilution tandem mass spectrometry. Simultaneously, to support the in-house certification study, an interlaboratory comparison study was conducted with 13 expert laboratories using different analytical methods. The certified mass fraction and expanded uncertainty (k = 2) of ERM®-BC715 (362 ± 22) μg kg−1 ZEN are traceable to the SI. This reference material is intended for analytical quality control and contributes to the improvement of consumer protection and food safety. Graphical abstract

scholarly journals The problem of improving the quality of seriously issued certified reference materials of the composition of gas mixtures

2019 ◽  
Vol 15 (3) ◽  
pp. 5-13
Author(s):  
L. A. Konopelko ◽  
A. V. Kolobova ◽  
O. V. Fatina
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Metrological Traceability ◽  
Gas Mixtures ◽  
Measuring Instruments ◽  
Expanded Uncertainty ◽  
Iso Guide 35 ◽  
The Russian Federation

Currently, in the Russian Federation, the metrological traceability of certified reference materials of the composition of gas mixtures in cylinders under pressure produced by manufacturers of certified reference materials is carried out in accordance with GOST 8.578-2014. Considering that certified reference materials of the composition of gas mixtures in cylinders under pressure are used for testing to approye the type of measuring instruments, verification, calibration, and graduation of gas-analytical measuring instruments used to control explosive gases and vapors, harmful components in the atmospheric air and the air of the working area, emissions from vehicles and enterprises, to control technological processes, the quality of hydrocarbon products, etc., the issue of ensuring the quality of seriously produced certified reference materials (about 100.000 cylinders with gas mixtures per year) is important. To ensure the quality of certified reference materials of gas mixtures in cylinders under pressure, mass-produced by manufacturers of certified reference materials, we offer the following actions:– manufacturers of certified reference materials’ passing of mandatory accreditation for compliance with the requirements of GOST ISO Guide 34–2014 and GOST ISO Guide 35–2015;– manufacturers of certified reference materials’ constant participation in the proficiency testing programs through interlaboratory tests;– actualizing and refining the existing set of standards defining the requirements for the entire life cycle of a certified reference material of a gas mixture in a cylinder under pressure;– improving the method of certification of a reference material by calculating the value of the expanded uncertainty of the reference material and the introducting a new coefficient «technological reserve».

Developments of Environmentally Certified Reference Material From the Brazilian Metrology Institute to Support National Traceability

2019 ◽  
pp. 120-139
Author(s):  
Andreia de Lima Fioravante ◽  
Evelyn de Freitas Guimarães ◽  
Fabiano Barbieri Gonzaga ◽  
Cristiane Rodrigues Augusto ◽  
Claudia Cipriano Ribeiro ◽  
...  
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Certified Reference Material ◽  
Great Part ◽  
Gas Mixtures ◽  
Environmental Demand ◽  
National Industry ◽  
Automotive Emission

This chapter aims to present the developments performed by the Brazilian Metrology Institute (NMI) – Inmetro, considering the environmental demand. Inmetro addresses a great part of its activities to the study of the traceability transference based on production and dissemination of certified reference material (CRM) of different areas in chemistry. The chapter presents results from certification of the following reference materials developed: BTEX and PAH in solution, besides automotive emission gas mixtures and bioethanol. So, the achievements made are the growth in developing CRM in order to support the needs of the national industry and to disseminate traceability among the society.

scholarly journals Global certified-reference-material- or reference-material-scaled nutrient gridded dataset GND13

2020 ◽  
Vol 12 (1) ◽  
pp. 487-499 ◽  
Author(s):  
Michio Aoyama
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Global Ocean ◽  
Nutrient Concentrations ◽  
Correction Factors ◽  
Data Product ◽  
Gridded Dataset ◽  
Nutrient Analyses ◽  
Better Than

Abstract. A global nutrient gridded dataset that might be the basis for studies of more accurate spatial distributions of nutrients in the global ocean was created and named GND13. During 30 cruises, reference materials of nutrients in seawater or their equivalents were used at all stations, and high-precision measurements were made. The precision of the nutrient analyses was better than 0.2 %. Data were collected from the hydrographic cruises in the JASMTEC R/V Mirai cruises, JMA cruise, CARINA, PACIFICA, and WGHC datasets from which nutrient data were available. Analyses were conducted at 243 crossover stations. Cruises that used certified reference materials or reference materials (CRMs/RMs) for seawater nutrient concentration measurements were used as a reference of an unbroken chain of comparison to determine correction factors which made nutrient concentrations obtained by other cruises SI traceable. Dissolved oxygen was secondarily quality-controlled using the same methodology as was used to create the nutrient gridded data product, but, lacking a traceable standard, the resulting oxygen data product is not SI traceable. Finally, a dataset of nitrate, phosphate, and silicate concentrations was created at latitude and longitude intervals of 0.5∘ and on 136 isobaric surfaces to depths of 6500 m as an SI-traceable dataset. This dataset has already been published at: https://doi.org/10.17596/0000001 (Aoyama, 2017).

Developments of Environmental Certified Reference Material from the Brazilian Metrology Institute to Support National Traceability

2013 ◽  
Vol 3 (3) ◽  
pp. 1-17 ◽  
Author(s):  
A.L. Fioravante ◽  
E.F. Guimarães ◽  
F.B. Gonzaga ◽  
C.M. Ribeiro ◽  
S.P. Sobral ◽  
...  
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Certified Reference Material ◽  
Great Part ◽  
Gas Mixtures ◽  
Environmental Demand ◽  
National Industry ◽  
Automotive Emission

This paper aims to present the developments performed by the Brazilian Metrology Institute (NMI) – Inmetro, considering the environmental demand. Inmetro addresses great part of its activities to the study of the traceability transference based on production and dissemination of certified reference material (CRM) of different areas in chemistry. It will be presented results from certification of the following reference materials developed: BTEX and PAH in solution, besides automotive emission gas mixtures and bioethanol. So, the achievements made are the growth in developing CRM, in order to support the needs of the national industry and to disseminate traceability among the society.

International Federation of Clinical Chemistry standardization project for measurements of apolipoproteins A-I and B

1991 ◽  
Vol 37 (10) ◽  
pp. 1676-1682 ◽  
Author(s):  
S M Marcovina ◽  
J J Albers ◽  
F Dati ◽  
T B Ledue ◽  
R F Ritchie
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Clinical Chemistry ◽  
Collaborative Study ◽  
International Federation ◽  
Apo B ◽  
Suitable Candidate ◽  
Candidate Reference Material ◽  
Test Systems ◽  
Suitable Reference

Abstract To minimize differences in apolipoprotein measurements among laboratories and methods, a standardization program involving common suitable reference material is needed. The Committee on Apolipoproteins of the International Federation of Clinical Chemistry initiated a collaborative study for the standardization of test systems for measuring apolipoproteins (apo) A-I and B, with 25 company laboratories and three research laboratories involved in apolipoprotein analysis to: (a) evaluate calibration differences among the test systems; (b) evaluate whether comparability of the data can be achieved with the use of frozen serum pools to recalibrate the different systems; and (c) evaluate and select suitable candidate reference material. We used 26 test systems for apo A-I and 28 for apo B. Relatively modest differences were found in calibration for apo A-I, but very wide differences were observed for apo B methods. After uniform calibration, the overall among-laboratory CV for apo B decreased from 19% to 6%. Three lyophilized serum preparations for apo A-I and three liquid-stabilized serum preparations for apo B were selected for further evaluation as candidate international reference materials.

Certified Reference Materials for the Characterisation of Multifunctional Materials

2005 ◽  
Vol 492-493 ◽  
pp. 635-640 ◽  
Author(s):  
Gert Roebben ◽  
Uwe Wätjen ◽  
Andrée Lamberty
Keyword(s):  
Quality Assurance ◽  
Reference Material ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Multifunctional Materials ◽  
Multifunctional Material ◽  
Minimum Sample Intake ◽  
Local Properties ◽  
Sample Intake ◽  
Material Producer

Multifunctional materials are created by intimately integrating different materials. The assessment of the local properties and composition of the different components of such a multifunctional material necessarily relies on techniques with sufficient spatial resolution. The increased use of these microanalysis or microprobe techniques has created a demand for appropriate quality assurance tools, such as reference materials. In this paper a number of issues related to the certification of reference materials for multifunctional materials are discussed. Examples of reference materials are shown to illustrate the particular challenges the reference material producer is faced with such as micro-homogeneity, minimum sample intake and stability.

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