J assoc off anal chem

The acceptance of microwave digestion technique is based on procedures successfully carried out for most different kinds of samples.

Mesley, W. Pocklington and R. Walker, Analyst , , , DOI: To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page. If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given. If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. Read more about how to correctly acknowledge RSC content.

J assoc off anal chem

For qualitative results objective reliability checks are often not present at all or applicable. Interlaboratory ring testing of methods, as sometimes required, showed often not to be applicable simply because enough adequate laboratories are not available. For instance this situation applied to the large number of methods of unclear reliability status, to be used for residue monitoring of hormonal growth promotors anabolic agents , which are completely banned within the European Communities since January This impasse was circumvented in with the formulation by an international group of analytical experts of a set of quality criteria for common analytical techniques like TLC, GC and HPLC separation , UV, MS and IR spectrometry detection and immunoassays separation and detection. These criteria, now published, are overviewed, as well as the availability of the control and reference materials belonging to them for actual analytical quality control and for validation of laboratories. Although developed for anabolic agents this new approach is applicable in practice for nearly all organic analytes and since very recently also for heavy metals. This approach has clear consequences for the mandatory quality of legislative residue analyses of food stuffs. As based on, amongst others, the combined experience of regulatory residue chemists within the EC, a collection of experimental selectivity indices is presented to rank the required specificity of regulatory residue methods ranging from within laboratory orientation to international forensic purposes in an objective way. Finally an estimate is summarized of the financial consequences of the applicable analytical techniques. This is a preview of subscription content, log in via an institution to check access. Rent this article via DeepDyve.

Chemical food analysis-fact and fiction, in Euroanalysis III. Jump to main content.

Overview DOI: The aim of this chapter is to review the QuEChERS sample preparation methodology and provide a summary of up-to-date information with modification options depending on the application needs. Springer Protocols. Authors: Steven J. Lehotay 1.

Try the Free App:. Prime PubMed is provided free to individuals by: Unbound Medicine. A total of 6 experiments were conducted: 1 sensitivity and linearity studies for elements S, P, Cl, and N by analyzing dursban; 2 a study of instrument response to Cl concentration in pesticide molecules; 3 organochlorinated pesticide recoveries; 4 organophosphate pesticide recoveries; 5 carbamate pesticide recoveries; and 6 investigation of metallic pesticides with plictran and vendex as standards. The rank according to sensitivity and linearity was found to be as follows: S greater than P greater than Cl greater than N Instrument response to the concentration of chlorine atoms in the pesticide molecule was linear, with a correlation coefficient of 0. Recoveries of organochlorinated pesticides were Organophosphate recoveries were Carbamate recoveries were inconsistent quantitatively; however, the information generated from elements N and S were useful for qualitative confirmation of other methods, such as LC postcolumn derivatization analysis. The instrument's capability of acquiring multi-elements Cl and P selectively and accurately is an alternative method for organochlorinated and organophosphate pesticide residue analyses. Separation and determination of diesel contaminants in various fish products by capillary gas chromatography.

J assoc off anal chem

A rapid procedure for determining cellwall constituents of plants consists of the determination of the fiber insoluble in neutral detergent and is applicable to all feedstuffs. The standardization of the method is based on a nutritional concept which defines fiber as insoluble vegetable matter which is indigestible by proteolytic and diastatic enzymes and which cannot be utilized except by microbial fermentation in the digestive tracts of animals. Access to content on Oxford Academic is often provided through institutional subscriptions and purchases. If you are a member of an institution with an active account, you may be able to access content in one of the following ways:. Typically, access is provided across an institutional network to a range of IP addresses. This authentication occurs automatically, and it is not possible to sign out of an IP authenticated account. Choose this option to get remote access when outside your institution. Enter your library card number to sign in.

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Please check back later as we are actively working on gathering the necessary information. Talanta 76 , — Stepan, R. Nguyen, T. More metrics information. Rent this article via DeepDyve. If you are a member of an institution with an active account, you may be able to access content in one of the following ways:. Anyone you share the following link with will be able to read this content:. Social activity. See below. Mills, P. Chemical food analysis-fact and fiction, in Euroanalysis III. Click Sign in through your institution. Food Chem. Kinsella, B.

Anionic, cationic, and nonionic detergents in different buffering media were examined for their capacity to dissolve nitrogenous constituents in forage dry matter, in the interest of preparing fiber of a low nitrogen content. Of the combinations examined, cetyl trimethyl ammonium bromide in strongly acid solution and sodium lauryl sulfate in slightly alkaline solutions appeared most effective. Access to content on Oxford Academic is often provided through institutional subscriptions and purchases.

Ihnat M Biological reference materials for quality control. Enter your library card number to sign in. Access this article Log in via an institution. Navigation Find a journal Publish with us Track your research. Francisco Bosch Reig. See ref [21], p 50— Ahrens et al. Institutional account management For librarians and administrators, your personal account also provides access to institutional account management. Analytical quality assurance. Jump to main content. Jump to main content. If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. Technomic Publishing Company Inc. In: Anabolic agents in beef and veal production.