Analysis of steroid derivatives by LC-MS/MS methods



Ádám Tölgyesi, Sharma, Virender K.

The analysis of veterinary drug residues and banned crop yield boosters in foods of animal origin is one of the largest and most important areas of food analysis. A prerequisite for effective tests is the development of accurate methods that satisfy the requirements of today’s analysis for selectivity, low limits of detection and accuracy. The high sensitivity and selectivity of liquid chromatographic triple quadrupole tandem mass spectrometric (LC-MS/MS) methods allows for the detection of trace amounts of the organic target compounds even in complex samples. However, the reliability of LC-MS/MS methods depends greatly on the sample preparation preceding the analysis, the objective of which is to decrease the concentrations of matrix components co-eluting with the target compounds, thus minimizing the matrix effect in the ion source of the instrument. During sample preparation, low performance liquid chromatographic clean-up, the so-called solid phase extraction (SPE) is often used.

LXIII./1. 31/03/17

Welcome 2017/1

Tuesday, September 06, 2016

Dear Readers,


I wonder a lot why, with advancing age, it seems that the daily time available to us is getting less and less. I think that the speed with which time passes is inversely proportional to extent of human expectations: eagerly awaited events seem to delay, and then the few blissful moments of fulfil­ment slip away with the speed of light into the carnival of the world. However, March has finally arrived – again: “Opening its rosy bosom, Spring descends to our meadow on tepid air. Zephyrs float on its balmy curls, And drink perfume.”1

Well, after these lyrical thoughts, what’s in store for our Readers in Issue no. 1 of 2017 of the renewed ÉVIK! 


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Accuracy of analytical standard solutions and the uncertainty in their nominal concentrations

Tuesday, September 06, 2016

Authors: Árpád Ambrus, Kamirán Áron Hamow, Gabriella Kötelesné Suszter, Anikó Németh, Etelka Solymosné Majzik


1.     Summary


In the last step of the analysis, the accuracy of analytical standard solutions has a de­cisive influence on the measurement results of pesticide residues, as well as all other chemical contaminants, and, in the case of actual concentrations differing from no­minal ones, can result in a systematic error during the determination of sample com­ponents. Therefore, most of the laboratories who feel responsible for their results pay special attention to the preparation and storage of standard solutions, and to reple­nishing solvent losses due to possible evaporation, based on the mass measurements of vessels storing standard solutions before and after use. 

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Chia seeds as a novel food

Tuesday, September 06, 2016

Authors: Ágnes Kemenczei, Anita Maczó, Anna Kiss

 

1.     Summary


One of today’s popular products is the seed of Salvia hispanica, more commonly known as chia seeds. Its popularity stems from its high nutrient content, and also from the be­neficial health effects associated with its consumption. Salvia hispanica was one of the staple crops of the Aztec and Mayan civilizations and, in addition to being consumed as a food, it was also used in medicine because of its special nutrient content. These days chia seed consumption is experiencing a renaissance again, for example, in the USA, Canada and Australia, it has been used for more than eight years as a food ingredient, because of its potentially beneficial health effects. The protein, essential fatty acid and fiber contents of chia seed are outstanding, and it is an excellent natural source of ant­ioxidants read more ...

Revision of the performance evaluation methods of sensory panelists performing descriptive analysis

Tuesday, September 06, 2016

Authors: László Sipos, Márta Ladányi, Zoltán Kókai, Attila Gere

 

1.     Summary


Sensory tests form the basis for sensory science. Sensory science uses human senses as measurement tools. During sensory tests, the properties of a product are evaluated by sensory panelists and by a sensory panel consisting of them. Decisions made after sensory tests are fundamentally determined by the quality of the data experienced, therefore, the quality of sensory data is determined by the trained and expert sensory sensory panel and its members. In our work, revision of the correlation and regression methods recommended by the standard titled „MSZ ISO 11132:2013 Sensory analysis. Methodology. Guidelines for monitoring the performance of a quantitative sensory pa­nel” are described, and corrections are suggested.

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Teaching of natural sciences in schools with the help of food investigation experiments

Tuesday, September 06, 2016

Authors: Eszter Imola Tisza-Kósa, András S. Szabó, Gergely Levente Szabó, Margit Izsák, Jnos Bozi

 

1.     Summary


Experiments are of primary importance in the teaching of scienctific knowledge. In our experience, it is a welcome sight for students if the subjects of the experiments are substances well known to them, in this case, different foodstuffs. Once again, 10 simple experiments of physical, chemical and biological character are described in the following topics: color development and pH value, masking of taste recognition, reaction of egg whites with salt and lemon juice, identification of glucose and sucro­se, preparation of effervescent powder, determination of the fat content of milk, xant­hoproteic reaction, wavelength-determination with cheese in a microwave oven, coo­king in a pressure cooker (Kukta pot), detection of carotenoids.Foodstuffs used in the measurements and experiments are: carrots, cheese, citric acid, egg whites, glucose, lemon juice, milk, powdered sugar , raspberry syrup, red beet juice, red wine, sodium bicarbonate, table salt, tartaric acid.


 

 

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Book review 2017/1

Tuesday, September 06, 2016

Food Safety Assessment of Pesticide Residues

Editors: Árpád Ambrus, Denis Hamilton


Pesticides are now accepted as an integral part of modern agricultural production. This book provides analysis of the steps taken by national and interna­tional bodies working towards a cohesive global strat­egy for evaluating the safety of residues in food that result from approved pesticide uses. Also described is the role of the UN Food and Agriculture Organiza­tion (FAO), World Health Organization (WHO) and Co­dex Alimentarius in developing standards that protect the health of the consumers and ensure fair practices in the food trade. It goes on to look at the promotion of good agricultural practice in the use of pesticides and the need for control in their practical use. 


 Food adulteration

Authors: János Csapó, Csilla Albert, Zsuzsanna Csapóné Kiss


This „Food adulteration” book was written for the students of the Faculty of Csíkszereda of the Sapi­entia Hungarian University of Transylvania. The au­thors hope that this book will be used also by the students of the prospective branch for foodstuff and environmental engineering, and even it may also pro­vide help for the students of the new branches during their studies. When writing this book the authors had to take into account the traditions of the faculty, so the analytical methods contained in this book are as­sociated with the materials taught in the framework of other subjects. Thus, the authors’ intention was to write such book to the students which could be uses during the practical teaching of several subjects.



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Review of national standardization 2017/1

Tuesday, September 06, 2016

Author: Csilla Kurucz

 

Published national standards from December, 2016 to February, 2017


ICS 07.100.20 Microbiology of water

MSZ EN ISO 14189:2017 Water quality. Enumera­tion of Clostridium perfringens. Method using mem­brane filtration (ISO 14189:2013)

07.100.30 Food microbiology

MSZ CEN/TR 16059:2016 Food analysis. Perfor­mance criteria for single laboratory validated meth­ods of analysis for the determination of mycotoxins (published in Hungarian)

 

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Local panorama 2017/1

Wednesday, September 07, 2016

Author: Zsuzsanna Frum
 

New apple varieties introduced by NÉBIH


15 new, resistent apple varieties from domestic orchards were presented to experts and apple-lovers at the apple variety introduction of the Na­tional Food Chain Safety Office (NÉBIH) in Buda­pest. At the professional roundtable discussion opening the event, representatives of the sector shared their experience about the significance and possibilities of resistant apple varieties, and then sensory testing of the new variety candi­dates was carried out by the experts and “lay” apple-lovers.


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Outlook 2017/1

Monday, December 05, 2016

Author: Réka Zanathy, Gábor Szunyogh


Frosen turkey dog food recalled for Listeria; people also at risk


Blue Ridge Beef is re­calling its frozen, raw turkey pet food from retailers in four states because it a poses a danger to people and their animals because of possible Listeria monocytogenes con­tamination. This recall was initiated with FDA inspection and sam­pling of the product,” according to the com­pany’s recall notice.

“Listeria can affect an­imals eating the prod­uct and there is a risk to humans from han­dling contaminated pet products, espe­cially if they have not thoroughly washed their hands after hav­ing contact with the products or any sur­face exposed to these products.”


 

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