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Preface

According to the long-term plan accepted by the Editorial Board, at the end of December 2012 we present to our readers the 33rd issue of the Polish Journal of Commodity Science. Recently we have established a new part of an international scientific committee theme editor of the packaging division and the statistical editor for our journal. Continuing efforts to widen the group of our readers we present some papers in English version. As before, regardless the language of the original publication, each paper contains a comprehensive summary in both Polish and English. The summaries of all the works published one can find on our webpage http://www.tpj.pr.radom.pl. A series of 12 articles of the current issue of our magazine is opened by the set of four papers on factors determining the quality of food products. This cycle begins with work by Popis on genetically modified foods. The author presented her findings on the awareness of consumers about the type of food. An assessment of the level of acceptance of genetically modified foods by consumers was performed. It was found that a significant part of the population is aware of the presence of genetically engineered products on the Polish market. According to the results of the study, more than half of the respondents would not buy genetically modified food. In the consecutive Giungato and Laiola took up the issue of the impact of industrial coffee roasting process on the quality of the final product. The authors determined the physicochemical properties of roasted coffee Arabica and Robusta. The results indicated significant differences in the degree of roasting for coffee of different origins. Also changes in the physical properties of coffee beans during roasting were .observed. One of the most important factors determining the correct assessment of the quality of fatty products is the choice of proper analytical method. The subject of the next study is comparison of several methods used to iodometric determination of peroxide value in vegetable oils. On the basis of the research performed, the authors recommend the methodology proposed by Crowe and White. This method is convenient in practical applications especially when the sample is small. Furthermore, implementation of this method allows a tenfold reduction in the amount of reagents. The problem of oils quality is continued in Sielicka’s paper. The author examined a new direction of oil and flax fiber applications. The properties of linseed oil and varnish, composites containing flax and flax genetic modifications allowing to obtain biopolymers and dressings enriched with antioxidants were discussed. The series of consecutive five papers is related to the quality control of cosmetics and household products. In the first one, Sulek, Paszkiewicz and Zawada discussed the applicability of electron paramagnetic resonance spectroscopy (EPR) to the quality control of ingredients in cosmetics based on vegetable oils. Castor, passionfruit and sweet almond oils and their ethoxylates were studied. It was found that the concentrations of free radicals in the tested plant oils depended on their type - they were several times higher than that of paraffin oil. The authors suggest that the use of plant materials in cosmetics should be preceded by reliable research of vegetable oils antiradical properties. As a measuring tool they recommend EPR. In the next work Kluj and Zielinski presented the results of their studies on antiradical activity measurements of infusions prepared from blends containing dog rose hip and other components. The results of quenching kinetics tests of DPPH revealed that the antiradical activity of these infusions is an increasing function of infusion time. Also a strong effect of the compositions containing wild rose on the antiradical properties of infusions was observed. Current trends in anti-acne cosmetic and dermocosmetic raw materials available on the Polish market are the theme of the article by Malinowska. The author showed some similarities, but also differences in the trends of raw materials applied to cosmetics and dermocosmetics. It was found that α-hydroxy acids were frequently used ingredients in dermocosmetics, while vitamins were the most commonly used active ingredients of cosmetics. In the next paper Olszańska, Sadowski and Ogonowski discussed selected substances used as active ingredients in hair conditioners. The authors considered the conditioning properties of quaternary ammonium salts, quaternary monoalkyltrimethylammonium salts, , dialkyl dimethylammonium salts, trialkylmethylammonium quaternary salts, proteins, amino acids, nucleic acids, cationic polymers and silicones. The subject of the next work is an application of sweet almond oil ethoxylate as an ingredient of make-up removing lotions. From the results of Choroś and Zięba presented it can be concluded that the concentration of sweet almond oil ethoxylate affects the quality of the cosmetic emulsion obtained. It was found that the best properties were revealed by the emulsions containing the ethoxylated sweet almond oil at the concentration above 1%. High quality cosmetics and household products would not be possible without the continuous search for new raw materials for this product group. In the consecutive paper Wieczorek and Staszak presented the results of research on the development of new surfactants from the group of sulfobetaines. The paper exhibits the results of wetting properties of this new class of compounds for the following surfaces: aluminum, paraffin, PVC, PTFE, glass and PMMA. It was shown that solutions of newly synthesized sulfobetaines have good wetting properties and that the wetting capacity increases with the number of carbon atoms in the alkyl chain, while the value of the contact angle decreases. In the next article Małysa and Włoskowicz analyze the importance of fruit vinegar in recipes of cleaning and polishing preparations for ceramic surfaces. The effect of concentration of fruit vinegar on selected physicochemical and usable properties of the preparations was studied. It was proved that the introduction of the fruit vinegar at moderate concentrations improved the ability of preparations to emulsify the fat. It was found that the cleaning products of the fruit vinegar cared for the surfaces and made them glossy. The new polishes and cleaning agents with selected raw materials reveal high quality. The subject of the last paper is the issue of recycling of polyester and glass. Jastrzębska presented the results of her research on the comparison of costs and benefits for investment in recycling of polyester and glass wastes. Using the internal rate of return method the profitability of such an investment was demonstrated. This methodology is supposed to help to make a decision whether to open the enterprise for recycling glass reinforced polyester and achieve its strategic goals and objectives. The profitability of the production using polyester-glass waste was proved. Thirty-third issue of our quarterly is closed by the regular column TPJ Announcements. It contains information on this year's Polish Quality Award and the report from the last international conference, held in September 2012 in Radom.

 I wish you a nice reading.

prof, dr hab. inż. Ryszard Zieliński
 Editor of TPJ

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