Czech Journal of Food Sciences, 2003 (vol. 21), issue 3
Determination of bisphenol A, bisphenol F, bisphenol A diglycidyl ether and bisphenol F diglycidyl ether migrated from food cans using Gas Chromatography-Mass Spectrometry
I. Jordáková, J. Dobiáš, M. Voldřich, J. Postka
Czech J. Food Sci., 2003, 21(3):85-90 | DOI: 10.17221/3481-CJFS 
Varnishes used for the inner coatings of food cans are mostly based on epoxy resins or vinylic organosols. The epoxy resins are produced from bisphenol A and bisphenol F and they also contain BADGE or BFDGE as stabilising components. A simple method for the quantitative determination of bisphenol A (BPA), bisphenol F (BPF), bisphenol A diglycidyl ether (BADGE), and bisphenol F diglycidyl ether (BFDGE) migrated from food packaging materials was optimised. The can sample was extracted with acetonitrile or with food simulants (distilled water, 3% acetic acid and 10% ethanol) and the extract obtained was analysed by gas chromatography coupled with mass...
Prediction of wheat and flour Zeleny sedimentation value using NIR technique.
M. Hrušková, O. Faměra
Czech J. Food Sci., 2003, 21(3):91-96 | DOI: 10.17221/3482-CJFS
Analytical quality parameters of wheat flour prepared from variety and commercial wheat samples (wheat harvest 1998, 1999, 2000 and 2001) were assessed by means of filter spectrograph Inframatic 8620 ASH (moisture and protein content) and Sedi-tester (Zeleny sedimentation value). The spectra of all samples were measured on spectrograph NIRSystem 6500. Calibration equations with cross and independent validation for all analytical characteristics were computed by NIR Software ISI Present WINISI II using MPLS and PLS method. The quality of prediction was evaluated by SEP and r parameters between the measured and the predicted values from cross...
Sorption characteristics of dietary hard candy
M. Hadjikinova, N. Menkov, D. Hadjikinov
Czech J. Food Sci., 2003, 21(3):97-99 | DOI: 10.17221/3483-CJFS
This investigation is aimed at the determination of the effect of sugar alcohols sorbitol and isomalt on the sorption properties of hard candy. The equilibrium isotherms of two kinds of hard candy containing sorbitol and isomalt, respectively, were obtained by means of the static gravimetric method at a temperature of 20°C. The isomalt-containing candy proved to sorb less moisture under equal conditions. The Peleg model was found suitable for the description of the sorption isotherms of hard candy.
Histometric evaluation of meat products - determination of area and comparison of results obtained by histology and chemistry
B. Tremlová, P. Štarha
Czech J. Food Sci., 2003, 21(3):101-106 | DOI: 10.17221/3484-CJFS
Histological examination of meat products enables direct identification and differentiation of the individual components. Image analysis is described in literature as a method that gives objective and accurate results comparable with chemical assay findings. The aim of this study was, therefore, to establish a procedure for the quantitative evaluation of meat products based on histological examination. For this reason, bone fragments in poultry meat products were detected. The technique used included the preparation of the mounts (staining with alizarin red), the application of digital photography, processing and analysis of the micrographs (ACC program,...
Screening for antimicrobial activity of some medicinal plants species of traditional Chinese medicine
D. Janovská, K. Kubíková, L. Kokoška
Czech J. Food Sci., 2003, 21(3):107-110 | DOI: 10.17221/3485-CJFS
The antimicrobial activity of crude ethanolic extracts of 10 medicinal plants used in traditional Chinese medicine was tested against five species of microorganisms: Bacillus cereus, Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans. Of the 10 plants tested, 5 showed antimicrobial activity against one or more species of microorganisms. The most active antimicrobial plants were Chelidonium majus, Sanguisorba officinalis, and Tussilago farfara.
Reference materials for the determination of contaminants in milk and milk products
J. Táborský, A. Hejtmánková, J. Dolejšková
Czech J. Food Sci., 2003, 21(3):111-120 | DOI: 10.17221/3486-CJFS
In this review, the latest information is given about the reference materials for the determination of contaminants in milk and milk products. Certified reference materials for the determination of contaminating chemical elements, organochlorine pesticides, polychlorinated biphenyls, dibenzodioxins, dibenzofurans, and aflatoxin M1 are presently available. Properties of these reference materials and possibilities for their use are discussed together with the maximum tolerances of contaminants in milk and milk products. The basic information about the producers and distributors of the reference materials in this area is provided.