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According to the long-term plan accepted by the Editorial Board, in the first days of January 2018 we present to our readers the 54th 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. A series of 12 papers in the current issue of our journal is opened by two articles on environmental quality. The first work is devoted to technological innovations related to the implementation of the concept of sustainable development. Adamczyk presented the technological innovations in the field of zinc concentrates recycling in industry. The recycling zinc concentrate from wastes in the modified Waelz kiln process was analyzed. Problems of classifying a full-value zinc concentrate obtained in this process are discussed in terms of the provisions of the Waste Act and REACH registration. In the second work Jachimowski discusses the issue of the quality of drinking water supplied by the water supply network of the city of Krakow. On the basis of the analysis of experimental data it was found that the quality of water depended mainly on the source of its origin. It was shown that the average monthly values of microbiological and physicochemical indicators of drinking water in Kraków in the 2011–2014 period met the requirements of both national and European standards. The subject of the next article is the issue of the quality of soda ash and its contamination. Wójcicki studied the correlation between these pollutants and the soda spectra taken in the near infrared using the analysis of PLS and PCR regression models. The study concluded that the proposed method of NIR spectroscopy using the discussed regression models might constitute a new promising approach in the methodology of assessing the quality of soda ash produced. In the consecutive paper, Jarossová presents the preliminary results of her research on the attitudes of Slovak consumers related to functional foods. The Author analyzes selected consumer purchasing behaviors in relation to functional food. The study states that Slovak consumers buy functional foods mainly for the purpose of disease prevention, for health reasons and because of its taste. The factor limiting these purchases is, according to the author, a higher price of functional food in comparison with the prices of traditional products. Evaluation of sensory quality of eggs from organic and conventional production is the subject of research by Witt and Śmiechowska. On the basis of research carried out in the group of consumers using a five-point quality scale, the authors distinguish quality ecological eggs with higher sensory appeal. Coffee is one of the most-consumed beverages in the world. Apart from polyphenolic compounds from the group of chlorogenic acids,  the characteristic component of coffee is caffeine. The subject of the next work is the assessment of the caffeine content in coffees of various species. Using the spectrophotometric method, Dankowska and Kowalski investigated the relationship between the method of brewing coffee and the caffeine content in prepared infusions. It was found that in the infusions brewed by pressure method the content of caffeine was higher than in infusions prepared in the usual way. Kombucha is a modern beverage prepared on the basis of fermented tea. The quality of this drink is the subject of empirical studies by Jakubowski and Śmiechowska. The paper presents the research results on the physicochemical characteristics of this product. Kombucha was shown to be a natural, low-pH drink, which was a rich source of antioxidants, polyphenols, organic acids, vitamin C and B group vitamins. It was found that kombucha could be considered as an interesting product characterized by high market potential. Research on the quality of wine, especially its flavor, requires not only a high sensory sensitivity but also a huge tester experience. Brodnicka and Szpakowska attempted to check whether the instrumental methods allowed for an objective distinction of red dry wines from Polish and French vineyards. For this purpose, the possibilities of using a potentiometric flavor sensor with ASSE type electrodes were tested. The study stated that the new sensor described could be used to distinguish between red wines from Polish and French vineyards. The consecutive two papers concern the quality of cosmetics. In the first one, Malinowska and Kujałowicz analyze the market supply of anti-wrinkle cosmetics designed for mature skin care. The estimation of the scope of application of active ingredients, natural oils and extracts in anti-wrinkle products and the division of all analyzed cosmetics due to their cosmetic use, age groups and ranges of their market prices were presented in the article. In the second one, Utracik and Zieliński present the results of their research on the properties of cosmetic creams containing evening primrose and sapphire oil. The results of research on rheological and cosmetic properties of the creams were discussed. It was found that all cosmetic creams produced with the addition of used vegetable oils were  nonbinghamian fluids exhibiting a shear thinning behavior. It was also proved that the presence of black carmine oil in the fat phase of the cosmetic cream led to the improvement of sensory parameters such as lubrication, spreadability over the skin and the degree of skin smoothing. The subject of the last two works are surfactants and their properties. In the first of these, Wieczorek et al. discuss the antimicrobial activity of the new amphoteric surfactants belonging to the sulfobetain group. On the basis of the tests performed, it was shown that the sulfobetaines obtained were characterized by high antibacterial activity. It was also found that the observed antibacterial activity depended not only on the length of the hydrophobic alkyl chain, but also on the structure of the hydrophilic part of the surfactant molecule. In the second one, Szutowska and Gwiazdowska are looking for new biosurfactants with emulsifying properties, which can be used to eliminate the effects of oil splashes. The authors discuss the results of their screening tests for lactic acid bacteria, which are potential producers of biosurfactants. It was experimentally demonstrated that lactic acid bacteria isolated from alimentary tracts of monogastric animals were able to synthesize biosurfactants. Moreover, it was found that the microbiological surfactants obtained in this way could be used as an alternative to conventional antibiotics for pigs and poultry. The 54th issue of the quarterly is closed by the column „TPJ Announcements”. One can find there information on the scientists who devoted their time to review the numerous papers sent to “Polish Journal of Commodity Science” in 2017. At this point, on behalf of the editorial board,  I  would like to thank you for the enormous effort put in the preparation of the reviews and constructive comments, which allowed us to improve the quality of the papers published on our pages.
I wish you a nice reading
 PJCS Editor  Prof. dr hab. inż. Ryszard Zieliński





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