Chemicals used for treatment of water intended for human consumption. Iron-based coagulants. Analytical methods

2019 ◽  
Keyword(s):  
Analytical Methods ◽  
Human Consumption ◽  
Iron Based

scholarly journals Enzyme Immunoassay for Measuring Aflatoxin B1 in Legal Cannabis

Toxins ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 265 ◽  
Author(s):  
Fabio Di Nardo ◽  
Simone Cavalera ◽  
Claudio Baggiani ◽  
Matteo Chiarello ◽  
Marco Pazzi ◽  
...  
Keyword(s):  
Enzyme Immunoassay ◽  
Aflatoxin B1 ◽  
Analytical Methods ◽  
Limit Of Detection ◽  
Direct Analysis ◽  
Aflatoxin Contamination ◽  
Throughput Capacity ◽  
Human Consumption ◽  
The European Union ◽  
Coefficients Of Variation

The diffusion of the legalization of cannabis for recreational, medicinal and nutraceutical uses requires the development of adequate analytical methods to assure the safety and security of such products. In particular, aflatoxins are considered to pose a major risk for the health of cannabis consumers. Among analytical methods that allows for adequate monitoring of food safety, immunoassays play a major role thanks to their cost-effectiveness, high-throughput capacity, simplicity and limited requirement for equipment and skilled operators. Therefore, a rapid and sensitive enzyme immunoassay has been adapted to measure the most hazardous aflatoxin B1 in cannabis products. The assay was acceptably accurate (recovery rate: 78–136%), reproducible (intra- and inter-assay means coefficients of variation 11.8% and 13.8%, respectively), and sensitive (limit of detection and range of quantification: 0.35 ng mL−1 and 0.4–2 ng mL−1, respectively corresponding to 7 ng g−1 and 8–40 ng g−1 ng g−1 in the plant) and provided results which agreed with a HPLC-MS/MS method for the direct analysis of aflatoxin B1 in cannabis inflorescence and leaves. In addition, the carcinogenic aflatoxin B1 was detected in 50% of the cannabis products analyzed (14 samples collected from small retails) at levels exceeding those admitted by the European Union in commodities intended for direct human consumption, thus envisaging the need for effective surveillance of aflatoxin contamination in legal cannabis.

scholarly journals Edible Oil Parameters during Deterioration Processes

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Marcos Flores ◽  
Victoria Avendaño ◽  
Jessica Bravo ◽  
Cristian Valdés ◽  
Oscar Forero-Doria ◽  
...  
Keyword(s):  
Analytical Methods ◽  
Fats And Oils ◽  
Human Consumption ◽  
Negative Effects ◽  
Laboratory Equipment ◽  
Continuous Increase ◽  
Edible Fats ◽  
Complex Processes ◽  
Nutritional Compounds ◽  
Thermal Deterioration

With the continuous increase in research on lipids, technologies and the development of chemical-analytical methods associated with the characterization and monitoring of different processes that involve modifications in edible fats are increasing. The beneficial effect of lipids, especially those essential for the health of the population, is widely known. However, degradation compounds are also produced that eventually have negative effects. In this dual context, the monitoring of the changes suffered by nutritional compounds can be obtained thanks to the development of technologies and analytical methods applied to the study of lipids. The modifications that lipids undergo can be followed by a wide variety of methods, ranging from the basic ones associated with simple chemical titrations to the more complex ones associated with sophisticated laboratory equipment. These determinations involve chemical and/or physical quantification of lipids to know an initial condition on the major and minor components. In addition to technologies that allow monitoring during more complex processes such as thermal deterioration, in multiple conditions depending on the objective of the study, this review could benefit a comprehensive understanding of lipid deterioration for future developments and research in the study of fats and oils for human consumption.

scholarly journals Inorganic Arsenic Determination in Food: A Review of Analytical Proposals and Quality Assessment Over the Last Six Years

2016 ◽  
Vol 71 (1) ◽  
pp. 25-69 ◽  
Author(s):  
Toni Llorente-Mirandes ◽  
Roser Rubio ◽  
José Fermín López-Sánchez
Keyword(s):  
Quality Assessment ◽  
Analytical Methods ◽  
Certified Reference Materials ◽  
Inorganic Arsenic ◽  
Human Consumption ◽  
Safety And Health ◽  
Low Concentrations ◽  
Recent Developments ◽  
Food Commodities ◽  
Arsenic Determination

Here we review recent developments in analytical proposals for the assessment of inorganic arsenic (iAs) content in food products. Interest in the determination of iAs in products for human consumption such as food commodities, wine, and seaweed among others is fueled by the wide recognition of its toxic effects on humans, even at low concentrations. Currently, the need for robust and reliable analytical methods is recognized by various international safety and health agencies, and by organizations in charge of establishing acceptable tolerance levels of iAs in food. This review summarizes the state of the art of analytical methods while highlighting tools for the assessment of quality assessment of the results, such as the production and evaluation of certified reference materials (CRMs) and the availability of specific proficiency testing (PT) programmes. Because the number of studies dedicated to the subject of this review has increased considerably over recent years, the sources consulted and cited here are limited to those from 2010 to the end of 2015.

Stereo modeling of HVEM specimens by serial tilting and computer graphics

1986 ◽  
Vol 44 ◽  
pp. 34-35
Author(s):  
J.R. McIntosh ◽  
D.L. Stemple ◽  
William Bishop ◽  
G.W. Hannaway
Keyword(s):  
Computer Graphics ◽  
Analytical Methods ◽  
Photographic Film ◽  
Complex Structures ◽  
Multiple Objects ◽  
Multiple Images ◽  
3 Dimensional

EM specimens often contain 3-dimensional information that is lost during micrography on a single photographic film. Two images of one specimen at appropriate orientations give a stereo view, but complex structures composed of multiple objects of graded density that superimpose in each projection are often difficult to decipher in stereo. Several analytical methods for 3-D reconstruction from multiple images of a serially tilted specimen are available, but they are all time-consuming and computationally intense.

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