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According to the long-term plan accepted by the Editorial Board, in the first days of July 2017 we present to our readers the 52nd  issue of the Polish Journal of Commodity Science. Continuing the efforts to widen the group of our readers all the papers are published in English. We would like to remind that now,  only papers written in English are accepted by the editors. As before, each paper contains a wide summary in Polish and English. The summaries in both language versions of all the works published one can find on our web page Moreover, at the web page an open-access to all the papers published up to 2016 is offered. In the first days of April 2017 a company of Polish commodity scientists was abandoned for ever by Stanisław Pfeifer, professor of Cracow University of Economics, an excellent employee of the Faculty of Commodity Science. The current issue of the quarterly is opened with thee reminiscence of Professor Pfeifer.  The issue of food safety can be dealt with on many levels and across different spheres of life. One can talk about technological, medical, economic or legal aspects of food safety.  A series of 13 articles in the current issue of our journal is opened by Żuchowska-Grzywacz's work on the legal aspects of food safety. This work attempts to analyze the concept of food safety in the context of the legal acts and  selected doctrines of definition and interpretation.  Modern commodity research reveals a pro-consumer orientation, focusing on the needs of the buyer. In the next paper, Samotyja describes scenarios illustrating the pro-consumer idea in food sustainability research. The author presents a food sustainability estimation model based on the probability of product rejection. The model combines the objective results of analytical research with the subjective criterion of consumer acceptance. The subject of the next work is the analysis of supplements for athletes. Using the method of recording absorption spectra in near infrared and advanced methods of statistical analysis Wójcicki identified three main types of supplements for this group of consumers present on the Polish market. These are: protein, creatine and BCAA. On the basis of the results obtained, the author concludes that near-infrared spectroscopy can be a promising method for assessing the quality of supplements for athletes. Tea is one of the most commonly consumed beverages. It contains many nutrients. Karwowska and Śmiechowska discuss the commodity aspects of dietary supplements containing tea. It was found that pu-erh, green and black tea extracts and polyphenols present in tea were most commonly used in preparation of dietary supplements. Based on the research, it was observed that not all dietary supplements containing tea were properly labeled and that a large excess of information on the labels made them less accessible or even unreadable to consumers. In the consecutive paper, Banach et al. present the results of their study on the chemical composition and conductivity characteristics of grains of different cereal species. It was proved that there were statistically significant correlations between the electrical parameters of cereal grains such as impedance and admittance and their chemical composition, mainly starch and lipid content. This observation opens the possibility to use conductivity measurements to distinguish species and varieties of cereals. Evaluation of the palatability and color parameters of syrups prepared from various species of raspberries is the subject of research by Korzeniowska-Ginter et al. The syrups prepared at home and commercially available were tested. Based on the studies of palatability and color parameters, it was found that the syrups obtained by extrusion were characterized by better palatability than those obtained with the juicer. The group of dietary supplements containing green leafy young barley has been  growing fast recently. They are a rich source of important micronutrients, provitamins, vitamins and natural antioxidants. Kiewlicz and Malinowska present the results of their research on the effect of solvent system composition on the antioxidant extraction efficiency of powdered young barley leaves. It was found that among the solvent systems used, extracts of young barley leaf powder obtained using a mixture of water and propylene glycol used in a ratio of 2: 1 had he highest antioxidant activity . Foltynewicz et al. investigated the antiradical activity of cydres. The paper presents the results of studies on the content of phenolic compounds and antiradical activity of several ciders produced under laboratory conditions and samples of ciders available on the market. It was found that the content of phenolic compounds depended mainly on the type of raw materials used in production process. It was also noted  that, in terms of antimicrobial properties, cider produced under laboratory conditions did not wither the commercial product. Moreover it was observed that the determined content of phenolic compounds in the test samples of ciders did not correlate with their anti-rust activity. In the next article Żywica et al. present their results on determination the quality characteristics of apple juice. The authors investigate the dependencies of conductive electrical parameters on the content of minerals and the dry mass of apple juice. It was found that the higher content of mineral components of juices tested corresponded to lower impedance and resistance values. Furthermore, it was observed that the higher content of minerals corresponded to the values of admittance and conductance. Michalska and Maleszka in their research investigate usability of the product and methods of its verification. On the basis of consumer tests, the usability of textiles and household appliances is discussed. In addition, the results of the usability tests carried out as part of the product certification process by an independent unit for a selected group of consumer durables were assessed. It was concluded that the level of functional quality of the tested products had improved as a result of the comments taken into account by the producers.  In the paper by Banaszczyk et al. the results of research on the microbiological evaluation of purity of automatic dishwashing machines are presented. The purpose of the study was to determine the survivability of certain  Bacilus species during a model washing cycle in an automatic dishwasher and the ability of these microorganisms to settle surfaces of the dishwasher components. It was found that some environmental species of the genus Bacillus can become promising ingredients in automatic dishwashers that can be used to improve microbiological safety and microflora stability of dishwashers.  The last paper deals with the question of consumer knowledge about paraben preservatives that are present in many cosmetic products. Szkiel i Walkusz present the results of the surveys conducted. It was found that consumers' awareness of paraben safety was low.  Internet is the main source of information on cosmetics. The authors also point out that most consumers are not interested in information contained in the label of the cosmetics. In particular, information on the paraben content is not relevant to consumers’ purchase decisions. The 52nd issue of the quarterly is closed by the column „TPJ Announcements”. One can find there an invitation to the conference on commodity science organized  by the Faculty of Commodity Science, Kraków University of Economics that will take place in Kraków, 8-10 November 2017.
I wish you a nice reading.
 PJCS Editor  Prof. dr hab. inż. Ryszard Zieliński