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According to the long-term plan accepted by the Editorial Board, in the first days of April 2019 we present to our readers the 59th 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 2017 is offered. In the last week of April 2019, a group of Polish commodities experts was abandoned by Professor Zofia Cichoń – a well-deserved researcher at the Department of Commodity Science and Quality, University of Technology and Humanities in Radom. The current issue of our journal opens with a reminiscence on the figure of Professor. The series of 11 articles of the current jubilee issue of our magazine is opened by Wiszumirska's work, in which the author discusses legal requirements for plastic materials and products based on polymers that are intended for direct contact with food. The paper presents processes and phenomena that may take place during the use and processing of polymeric materials, especially in food packaging. Also the possibility of contacting recycled polymer materials with food is discussed. Increased histamine content is one of the factors determining the quality of some types of food, especially fish. In the next paper on food quality testing, Czerniejewska-Surma et al. present the results of their research on the impact of the fishing season on the histamine content in Baltic herring and bream. It was experimentally proved that the histamine content in the meat of these fish depended on the fishing season. The possibilities of application contemporary instrumental methods in commodity research are discussed in Wójcicki's article on the beer quality assessment. The author presents the results of his research based on registration of spectra of beer samples in the near infrared range and the development of the obtained spectra using advanced statistical methods covered by the term: chemometric methods. The low availability of gluten-free products does not allow part of society to fully participate in popular social activities, such as eating or drinking beer. The brewing process usually uses barley malts containing gluten, while the production of beer from wheat malts is also increasing. Therefore, beer is unsuitable for consumption by patients with an undesirable effect of gluten. The paper by Celejewska, Borycka and Borek-Wojciechowska presents the results of their research on  comparative analysis of the physicochemical parameters of malt beer and corn beer. The corn beer research results presented in the paper fully confirm the possibility of synthesis of a gluten-free product. The consecutive five papers present research on factors affecting the quality of cosmetics. One of the basic features of skin care products expected by consumers  is their moisturizing effect. In cosmetic preparations, this function is performed by emollients. They are  a commonly used group of lipid substances responsible for meeting this quality criterion in modern cosmetic products. In the next paper, Dworieckaja discusses the importance of emollients in the epidermal barrier and describes the multidirectional effects of vegetable oil ingredients. The possibilities of replacing synthetic antioxidants in cosmetic products by ingredients of natural origin are the subject of many research works. Malinowska presents the results of her research on the impact of tocopherol content on the oxidative and physicochemical stability of shower oils based on natural oils. The study examined the effect of 0.1% and 0.02% 

tocopherol as well as 0.02% BHT on the physicochemical and oxidative stability of shower oils stored for 6 months at -5°C, 25°C and 40°C. Based on measurements of peroxide number, it was shown that the addition of 0.02% tocopherol to the samples of tested shower oils provided a more effective antioxidant effect than 0.02% BHT under all storage conditions. Cosmetics storage tests are the subject of the consecutive paper. Michocka, Wybieralska and Stachowicz present the results of their research on the impact of storage conditions on the stability of protective and moisturizing lipsticks containing various vegetable oils. The research included lipsticks containing coconut oil, apricot kernel oil, castor oil and olive oil. Based on the assessment of the stability of lipsticks, the time of minimum durability of the products was determined and optimal storage conditions, such as temperature change or access to light, were characterized. For many years, pro-ecological trends in the field of cosmetic product recipes have been observed. In the next article, Kwaśniewska, Wieczorek and Woszczek present the results of their work on the quality assessment of commercial hair shampoos containing various basic surfactants. The results of research on the effect of these shampoo ingredients on the value of transepidermal water loss are presented. It was found that none of the tested commercial shampoos had an inhibitory effect on transepidermal water loss during the analyzed period. In the consecutive paper, Swat and Zieliński present the results of their research on the possibility of whitening particles of the microsphere, which is waste in the process of energy production in coal power plants. The possibilities of employing this waste’s peeling properties in cosmetic products were discussed. The use of bleached microsphere as the active ingredient of peeling creams was proposed. The paper discusses the results of sensory tests of the softening heel creams containing urea and the bleached microsphere. The applicability of bleached microsphere as the active ingredient of cosmetic peeling creams was experimentally demonstrated. The management of electric and electronic wastes is the subject of Cieszyńska's article. The author discusses the methods of recovering valuable metals by hydrometallurgical methods, which for two decades have been the subject of the most intensive research in the field of wet metal recovery techniques. Solvent extraction methods are used to recover precious metals from sources of low concentration. The paper presents the results of the research on the efficiency of palladium (II) ion removal from acid solutions in the extractionreextraction process. The 60th issue of our quarterly is closed by the “PJCS Announcements” column. It contains information about the next international conference “Commodity Science in Research and Practice” organized by the Department of Commodity Science and Product Management, Kraków University of Economics, which will be held in November 2019.

I wish you a nice reading

PJCS Editor Prof. dr hab. inż. Ryszard Zieliński




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