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Preface


 Pursuant to the long-terni plan ofthe Editing Board, at the end of June 2007 we arc presenting to you — our Readers — the eleyenth issue of quarterly Polżsh Journal oj Commodiiy Science. We haye assumed that new trends in quality eontrol and enyironment would be the leading motiye. Most papers presented in the paper arc written in English, due to our attempt to widen the group of the readers. As before, eaeh paper eontains a large abstraet in Polish and English. These abstraets in both languages arc ayailable at our web page http:/!wy.tpj.pr.radom.pl. Within last years, notion of biodegradability and biodegradable materials established in customers” conscience. Although it seems that these notions arc weli comprehensible, eyeryone understands them in different ways. By some, the notion is eommonly used to deseribe products that decompose in any enyironnient, in which biologieal or bioehemieal processes run, without attention to the meehanism of these decomposition processes. For others, this notion relates only to such products that can decompose via biochemieal reactions catalyzed by suitable enzymes. As far as biodegradable polymers arc coneerned, their biodegradation is usually understood as chemical degradation caused by reaetions that (at least at one stage) arc eatalyzed by enzymes, no matter if they run under aerobie or anaerobie eonditions. The problems of biodegradable polymers arc discussed in the paper by Izdebska and Podsiadło, referred to polymerie paekaging mateńals. The paper by Murmura, Taddeo and Liberatore is also deyoted to bio-polymers. The Authors diseuss enyiromnental and economical aspeets of biopolymers based on renewable resources. Within last years production of polymerie materials has inereased signifieantly, due to their wide applieation in paekaging, agriculture or medieine. The Authors hope that biocomposites will reduce demand on traditional, synthetic polymers, as well as the enyiromnental hazard imposed by production and utilization ofwaste. This should haye positiye enyironmental and eeonomieal effects. The suecessiye paper, by Sydorenko and Berbents, is dedicated to the ereation of new food produets, nutritionally and biologieally balanced. The rules of mixing yarious food eomponents were deseribed. The fiye-stage proeedure of designing formularies of new food produets was diseussed in detail. Partieular attention was paid to the existing methods of food eontent optiniization. Additionally, the Authors deseribed the state policy ofproduetion ofhealthy food in Ukraine. The attempts made to improyement of quality of pro ducts lead to application biologically actiye agents, e.g. in eosmeties or household ehemistry produets. From marketing point of yiew, information that the produet eontains natural substances or extracts flom (sometimes exotie) plants makes strong impression on eonsumers. These aetiye agents — mainly antioxidants - arc present not only in the mentioned groups of produets, but also in food or pharmaeeutieals. In the ehemieal eonstitution of these produets metals (precisely: metallie ions) arc of the present. The Authors of the next paper (Wybieralska, Wieczorek, Szymusiak i Zieliński) asked the question: can the presence of metals effeet the quality of natural antioxidants eontained in the trade products? In the seareh for answer to this question experiments were performed and antioxidatiye aetiyity of quereitin in the presenec ofbiyalent metal eations was modeled. During the tests it was coneluded that addition of biyalent metal eations eaused significant inerease of antioxidant actiyity of the system at relatiyely bw eoneentrations of metals. To explain the phenomenon the Authors performed eomputer modeling of the proeesses nmning. The preliminary results of the caleulations show that the ehange of antioxidants properties ean by eaused by formation of eomplexes with metals that reyeals different antioxidatiye properties than flayonoids themselyes. Oliye oil is a basie plant fat eonsumed in Europe. Its consumption in EU reaehes 70% ofthe world consumption. As eompared to other plant oils, the oliye oil eontains many natural antioxidants bebonging to the group ofpolyphenols which arc responsible for slowing down the oxidation processes. The rate of oxidation depends on many faetors, such as temperature and light. Also in retail the plant fats arc subject to these issues. In the sueeessiye paper Buczek and Leśniak tested ehanges of qualitatiye indiees of extra yirgin oil and pomaee oil that oeeurred afber UV exposure. Erom the data presented it ean be eoneluded that the peroxide nuniber md the anisidine yalue can be significant markers of oii oxidation reaction. The Authors also obseryed correlation between these yaiues aud duration ofIJV exposure. Appiication of modem packagiug of products that arc supposed to be warmed in microwaye oyens requires checkiug if this process is safe for users. In the paper by Melski release of yolatile substances ttom piastic packages during microwaye warming is anaiyzed. The quaiity of trade pro ducts is strictly connected with proper selection of their content. It is particularly important iii the case of products intended to dean building eleyations. Properly dcsigned cieaning agent shouid be not oniy safe for the building materials, but also for the enyironment. Such products should act quickly without penctrating the wali materials aud also shouid reduce possibility of wali moist. This can be obtained by hydrophobization of the siirfaces. The problem of quality control of modem agents for washing hard surfaces is analyzed in the paper by Tomaszkiewicz-Potępa aud Mitoraj. In the successiye paper Sulek, Zięba aud Pricnal discussed the results ofthe tests of fabric softeners. The Authors presented the tests resuits of systems containing silicone glycols. A few organie silicones yaried by the lengths of ethylene aud propylene oxide chains. It was conciuded that addition of silicone glycols significantly influences the usabic properties of fabric softeners. In Conimunication section two works were presented. The first one, by Tóth, Sipos aud Istyn presents production of eleetricity in Hungary. Particular attentiou was paid to enyironmental factors. The consumption of raw materiais uecessary to produce 1 MJ using yarious methods was discussed. Some qualitatiye indices of euyironmental hazard were deseribed. Also methodology of deyeiopment ofassociated power industry was explained. The other communicatiou by Krasoyski deals with dry building mixtures. Although nowadays these products arc stili reiatiyeiy modem, in fiiture they will probably be used in the whole building engineering. In the paper quality aud safety control of these products is discussed. The Author refiects how to improye the competitiyeness of the dry mixtures, not only by the price policy. The 11 issue ofour quarterly is ciosed by TPJ Announcements colunin. One can fmd there an inyitation to 16 Intemational Symposium IGWT in Korea and the report from 4 Intemational Conference „Surfactants aud Dispersed Systems in Theory aud Practice”.

We wish you pieasant reading.

 Deputy editor of Polish Journal
 of Commodity Science
 Professor Ryszard Zieliński

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