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According to the long-term plan accepted by the Editorial Board, in January 2017 we present to our readers the jubilee, 50th issue of the Polish Journal of Commodity Science. Continuing the efforts to widen the group of our readers, also in the current issue, most articles are published in English. We would like to remind that now, only papers written in English are accepted by the editors. As before, regardless the language of the original publication, each paper contains a wide summary in both Polish and English. The summaries in both language versions of all the works published one can find on our web page  A series of 17 articles in the current issue of our journal is opened by Urbaniak work on the role of environmental management and environmental product solutions in building relationships with suppliers. The Author discusses the emerging trends related to the requirements imposed by multinational consortia on their suppliers involving the reduction of the negative impact of new products on the environment. The quality of banking websites belonging to the Polish banks is the subject of the second paper. The Author of this study, Khmarskyi, presents this issue from the point of view of customers. The results of the survey on the level of customer satisfaction with the quality of such services are discussed. In the consecutive work Feliczek presents the results of the implementation of the quality management system in the  sector of medical devices. The study found that in order to manage the results, it was necessary to undertake such actions, which would be adequate to the expected results. The most important factors affecting the outcome of actions taken should be asset management, collaboration with customers and suppliers, as well as communication with customers and other external devices. A very interesting application of commodity science methods is shown in the work by Syguła-Cholewińska, Lech and Szostak-Kot. The subject of their experimental research is the issue of securing the archives collections against microbiological hazards. The results of microbiological tests of indoor air in Kraków archives indicate the need to take preventive and corrective environmental management of storing resources. In the next paper Kowalska analyzes consumer expectations related to the packaging of everyday products. The study proves that regardless the age group, consumers tend to value information and functionality of the packaging of everyday products over the aesthetic. The study also shows that older consumers are more aware of the risks posed to the environment come from packaging waste. The problem of radiolysis of paper as a packaging material is the subject of research by Głuszewski et al. The Authors point out that the packages are sometimes treated for radiation before the products are being placed inside. Hence the necessity of research on the effects of ionizing radiation on paper whose main component is cellulose. It was shown that irradiation of paper only slightly accelerated oxydegradation of cellulose, and in the case of larger lignin content, this effect was negligible. The eight consecutive papers are devoted to the problem of quality of food products. In the first one, Achremowicz et al. assess the quality of oats produced in different countries. The sensory evaluation showed that for most parameters studied samples of oatmeal did not differ statistically. Moreover, it was revealed that all the samples were rich in manganese, iron and zinc.It was emphasized that the Swedish samples could be treated as the best source of both zinc and iron. 
The subject of article by Ruszkowska and Rogowska is the assessment of  the sorption capacity of Spanish sage seeds. The Authors carried out experimental studies aimed at determining the course of the adsorption isotherm of water vapor by the seeds after 45 days of storage in a wide range of water activity. On the basis ofthese results, the storage stability of Spanish sage seeds was determined. In the next work Bohdziewicz discusses the selected qualitative properties of Gouda cheeses. Based on the survey a considerable variation of the analyzed quality determinants of cheeses was found, both within the different and the same manufacturers. Differentiation regarding the content of salt and potential acidity was observed. Bienkiewicz et al. investigated the nutritional value of some species of wild mushrooms. The paper presents the results of research on the fatty acid composition, protein content and antioxidant activity of dried mushrooms from forests of West Pomeranian Province. It was found that the antioxidant activity of dried mushrooms depended mainly on the species of fungi. The issue of the oxidative stability of argan oil is the subject of the work by KondratowiczPietruszka and Ostasz. The Authors present the results of research on oxidative changes that occur in argan oil as a result of its heating and UV irradiation. Based on the selected quality determinants evaluated, it was found that both the increase in temperature and UV exposure substantially reduced the period of stability of the oil. In the next paper Kiewlicz and Zielinski present the results of their research on computational methods supporting the selection of effective extractants to obtain antiradical substances from plant materials. The paper presents the possibility of using several types of solubility parameters in the selection of solvent for the efficient extraction of phenolic antioxidants contained in young barley. A practical applicability of the Hansen and Bagley method (HSP) was demonstrated for this purpose. In the consecutive work Klensporf-Pawlik et al.  present the results of the study on the determination of polyphenolic compounds and the antioxidant properties of coffee substitute. The Authors analyzed the impact  of cereal coffee components, such as barley, rye, chicory and sugar beet on these properties. It was found that the highest total content of phenolic compounds   could be found in rye, while the lowest – in sugar beet. The last work in the subject of food quality also deals with the issues of antioxidant properties of foods. Maciejewska et al. shows the results of the study on the determination of phenolic compounds and antioxidant activity of selected juices of plant origin. The study involved juices obtained from artichoke, pickled cabbage, leavened celery, nettles and birch. It was observed that the tested juices varied considerably in the content of polyphenolic compounds and antioxidant activity. The issue of the antioxidant activity of plant materials is the theme of the paper by Malinowska. The Author presents the results of research on the measurement of antioxidant activity of the extracts of seeds available on the Polish cosmetics market: milk thistle, horse chestnut, soybeans and oats. A high correlation between the content of polyphenol compounds in the studied extracts from the seeds and their antioxidant capability was confirmed. The next paper relate to factors affecting the quality of cosmetics. Małysa et al. discuss the results of the assessment of the quality of liquid bath made with the addition of modern amphoteric surfactants prepared according to their own recipes. It was shown that the addition of betaine and sulphobetaine revealed beneficial effect on the physico-chemical properties and performance of these formulations. It was also found that the obtained prototypes of liquids were delicate in action and did not cause skin irritation. 
In the last paper Walicka et al. present the results of research on the assessment of detergents and their impact on selected strength parameters of the fabrics washed. The 50th issue of the quarterly is closed by the column „TPJ Announcements”. One can find there a report on the 8th International Conference on Commodity Science that took place in Radom, 21-22 June 2016. 
I wish you a nice reading. 
 PJCS Editor  Prof. dr hab. inż. Ryszard Zieliński





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