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Omeroglu P.Y.,Okan University | Boyacioglu D.,Technical University of Istanbul | Ambrus A.,Hungarian Food Safety Office | Karaali A.,Yeditepe University | Saner S.,SK Group
Food Analytical Methods | Year: 2012

To facilitate the international food trade as well as to protect consumers from exposure to unacceptable pesticide residue levels, Codex Alimentarius Commission, European Union, and National Authorities set maximum residue limits for different food commodities. The control of pesticide residues at national and international level requires reliable and comparable analytical data that can be obtained by applying validated methods and implementing an effective internal quality control and quality assurance system in the testing laboratories. For the correct interpretation of the analytical results, measurement uncertainty should be estimated. Pesticide residue analysis includes two main steps: sampling performed outside of the laboratory and laboratory operations comprising of sample preparation, sample size reduction, sample processing, extraction, cleanup, and chromatographic determination. By taking into consideration the contribution of the individual steps to the overall uncertainty of the results, the analytical procedures can be optimized to fit for the purpose of the analysis with minimum cost. The scope of this paper is to review major steps of pesticide residue analysis in the light of current developments, to highlight the importance of identification and estimation of the uncertainties associated with the results, to describe suitable methods for their estimation, and to summarize the contribution of each step to the combined uncertainty. © 2012 Springer Science+Business Media, LLC.

Yolci Omeroglu P.,Okan University | Ambrus A.,Hungarian Food Safety Office | Boyacioglu D.,Technical University of Istanbul
Food Analytical Methods | Year: 2013

Sample processing procedure should result in analytical portions that are representative of the analytical sample, even if 1-5 g portion are withdrawn from a large-size crops. Therefore, the efficiency of sample processing should be regularly tested during method validation and internal quality control studies. In the scope of this study, sample processing uncertainty was investigated by surface treatment of the cucumber, papaya, and jackfruit representing large-size crops with radio-labelled chlorpyrifos methyl. After homogenization in a chopper, five small and five large test portions were withdrawn from "statistically" well-mixed materials and their residue content was determined with liquid scintillation counter, which provided a quick and well reproducible mode of quantitative determination of residues. The efficiency of sample processing characterized with the sampling constant, changed between 0. 78 and 3. 01 kg with typical value of 1. 61 kg for processing at ambient temperature. Once the sampling constant was established, it was used to predict the uncertainty of sample processing for different test portion sizes. Uncertainty of sample processing at 30 g analytical portion varied between 4. 70 and 10. 55 %. Furthermore, addition of dry ice to papaya resulted in well-mixed samples as well as 50 % reduction in sampling constant value. © 2012 Springer Science+Business Media, LLC.

Balayiannis G.,Benaki Phytopathological Institute | Karasali H.,Benaki Phytopathological Institute | Ambrus A.,Hungarian Food Safety Office
Bulletin of Environmental Contamination and Toxicology | Year: 2014

The extensive use of plant protection products in urban and rural pest control obliges to develop valid analytical methods for their successful and reliable quality control. An analytical procedure for the simultaneous determination of famoxadone and cymoxanil, by reversed phase high performance liquid chromatography based on the use of a monolithic C18 column has been developed and validated. The method involved the extraction of the active ingredients by sonication of the sample with acetonitrile and direct injection on a reversed phase liquid chromatographic system. The repeatability of the method expressed as relative standard deviation (%RSD), was lower than 1 % for both compounds. The limits of quantification for famoxadone and cymoxanil were 10 and 16 µg mL−1 respectively. The new method involves a considerable reduction in time for both sample preparation and analysis. The proposed analytical procedure is accurate and precise. © 2014 Springer Science+Business Media New York

Szeitz-Szabo M.,Hungarian Food Safety Office | Biro L.,NutriComp Nutrition and Health Co. | Biro Gy.,Hungarian Food Safety Office
Acta Alimentaria | Year: 2012

The authors' aim is to reveal the reflection of Hungarian political and economic transformation in the public health nutrition during the last two and a half decades. Results of the four representative, nationwide dietary surveys completed in this period have been analysed for macro-, micronutrient intakes and overweight/obesity. The food consumption-related vital statistics provided by Hungarian Central Statistical Office were also analysed and compared. There are certain signs of favourable improvements: slight decrease of energy intake in females, growing share of plant protein, less saturated, more polyunsaturated fatty acid intake, less sugar. These findings are in parallel with some positive general statistical issues: the extension of life expectancy, lesser acute myocardial infarction, atherosclerosis and stomach cancer mortality, more vegetables and fruit, lesser lard, more oil consumption. On the other hand, there are several detrimental nutritional issues that influence the health status of Hungarian population: still high energy, fat and cholesterol intake, low complex carbohydrates, too much sodium (salt), insufficiencies in some vitamin, macro- and microelements intake. The number of overweight/obese people takes up fairly high level. The surveys somewhat revealed the role of nutrition in the health status of population and now a particle of possibility for its improvement is available.

Szeitz-Szabo M.,Hungarian Food Safety Office | Biro L.,NutriComp Nutrition and Health Co. | Biro Gy.,Hungarian Food Safety Office | Sali J.,Hungarian Food Safety Office
Acta Alimentaria | Year: 2011

In 2009 Hungarian Food Safety Office (HFSO) performed a countrywide representative dietary survey to obtain food consumption data for quantitative food safety risk assessment utilizable in the field of public health nutrition as well. The consumption of foodstuffs, daily energy- and nutrient intakes, nutritional habits and dietary supplement usage of Hungarian population was assessed. The complex system has included three-day dietary record and a food consumption frequency questionnaire. Some anthropometric parameters were also self-recorded. According to the body mass index, a considerable proportion of both the 31-60 years old males (69%) and females (46%) were overweight or obese. The energy intake of the Hungarian adult population is slightly exceeds the recommendation. The intake of proteins is satisfactory in general. The average intake of total fats is very high (36.1-38.9 energy percent), and the fatty acid composition - mostly the ratio of n-6/n-3 fatty acids - is unfavourable, but the fatty acid pattern regarding saturated- (SFA), mono- (MUFA) and polyunsaturated (PUFA) fatty acid ratio shows favourable tendency. The proportion of complex carbohydrates within the intake of energy providing macronutrients is far lower than the optimal level, but it is a positive finding that added sugar intake is below the outmost recommendation. The average daily cholesterol intake is high (males: 469 mg, females: 335 mg), whilst the dietary fibre intake is lower than the recommended. The article provides data on alcohol, caffeine and fibre consumption, too.

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