Pub Date : 2014-05-15DOI: 10.2478/s11532-014-0570-y
I. Barauskienė, E. Valatka
AbstractCobalt (hydro)oxide films on AISI 304 stainless steel and sintered metal fibre filter Bekipor ST 20AL3 were prepared using electrochemical deposition from neutral cobalt acetate solutions under galvanostatic conditions. Deposited films were structurally characterized using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. All electrochemical measurements were performed in aqueous NaOH solution. Capacitive behavior of different films was evaluated using cyclic voltammetry data. The highest specific capacitance (965 F g−1) was reached when Bekipor ST 20AL3 mesh was used as a support for electroactive substance.
摘要以中性醋酸钴溶液为原料，在恒流条件下电化学沉积，在AISI 304不锈钢和烧结金属纤维过滤器Bekipor ST 20AL3上制备了钴(氢)氧化膜。利用x射线衍射、傅里叶变换红外光谱和扫描电镜对沉积膜进行了结构表征。所有电化学测量均在NaOH水溶液中进行。利用循环伏安法对不同薄膜的电容行为进行了评价。Bekipor ST 20AL3网片作为电活性物质载体时，比电容达到最高(965 F g−1)。
{"title":"Synthesis, structure and capacitive properties of cobalt hydroxide films on stainless steel substrates","authors":"I. Barauskienė, E. Valatka","doi":"10.2478/s11532-014-0570-y","DOIUrl":"https://doi.org/10.2478/s11532-014-0570-y","url":null,"abstract":"AbstractCobalt (hydro)oxide films on AISI 304 stainless steel and sintered metal fibre filter Bekipor ST 20AL3 were prepared using electrochemical deposition from neutral cobalt acetate solutions under galvanostatic conditions. Deposited films were structurally characterized using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. All electrochemical measurements were performed in aqueous NaOH solution. Capacitive behavior of different films was evaluated using cyclic voltammetry data. The highest specific capacitance (965 F g−1) was reached when Bekipor ST 20AL3 mesh was used as a support for electroactive substance.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"114 1","pages":"1206-1211"},"PeriodicalIF":0.0,"publicationDate":"2014-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88000824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-15DOI: 10.2478/s11532-014-0558-7
M. Melnik, P. Mikuš, C. Holloway
AbstractThis review classifies and analyzes heterohexanuclear platinum clusters into seven types of metal combinations:Pt5M, Pt4M2, Pt3M3, Pt2M4, PtM5, Pt2M3M′, and Pt2M2M2′. The crystals of these clusters generally belong to six crystal classes: monoclinic, triclinic, orthorhombic, tetragonal, trigonal and cubic. Among the wide range of stereochemistry adopted by these clusters, octahedral and capped square-pyramidal are the most common. Although platinum is classified as a soft metal atom, it bonds to a variety of soft, borderline and hard metals. Nineteen different heterometal ions are involved in hexanuclear platinum clusters. The shortest Pt-M bond distance in the case of M being a non-transition element is 2.395(4) Å for germanium and for M being a transition metal ion it is 2.402(2) Å for Cobalt. The shortest Pt-Pt bond distance observed in these clusters is 2.532 Å. Several relationships between the structural parameters are identified and discussed. Some clusters exist in two isomeric forms and some show crystallographically independent molecules within the same crystal. Such isomers and independent molecules are examples of distortion isomerism.
{"title":"Crystallographic and structural characterization of heterometallic platinum complexes Part VI. Heterohexanuclear complexes","authors":"M. Melnik, P. Mikuš, C. Holloway","doi":"10.2478/s11532-014-0558-7","DOIUrl":"https://doi.org/10.2478/s11532-014-0558-7","url":null,"abstract":"AbstractThis review classifies and analyzes heterohexanuclear platinum clusters into seven types of metal combinations:Pt5M, Pt4M2, Pt3M3, Pt2M4, PtM5, Pt2M3M′, and Pt2M2M2′. The crystals of these clusters generally belong to six crystal classes: monoclinic, triclinic, orthorhombic, tetragonal, trigonal and cubic. Among the wide range of stereochemistry adopted by these clusters, octahedral and capped square-pyramidal are the most common. Although platinum is classified as a soft metal atom, it bonds to a variety of soft, borderline and hard metals. Nineteen different heterometal ions are involved in hexanuclear platinum clusters. The shortest Pt-M bond distance in the case of M being a non-transition element is 2.395(4) Å for germanium and for M being a transition metal ion it is 2.402(2) Å for Cobalt. The shortest Pt-Pt bond distance observed in these clusters is 2.532 Å. Several relationships between the structural parameters are identified and discussed. Some clusters exist in two isomeric forms and some show crystallographically independent molecules within the same crystal. Such isomers and independent molecules are examples of distortion isomerism.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"3 1","pages":"1101-1126"},"PeriodicalIF":0.0,"publicationDate":"2014-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80241732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-15DOI: 10.2478/s11532-014-0567-6
A. Takáčová, M. Smolinská, J. Ryba, T. Mackuľak, Jana Jokrllová, P. Hronec, G. Čík
AbstractIn this work for disposal of the biologically hard decomposed pollutant Benzo[a]Pyrene (BaP) photooxidation Chlorella kessleri was used. The simulation model system under the different experimental conditions (varying biomass and light intensity) was evaluated. For quantitative analysis of the decrease in BaP, GC/MS technique was used. The highest degradation efficiency was achieved in the case of biomass from the culture of live algae (29%) and light intensity at level of 13.5 W m−2. When the dry biomass was used, degradation under the same conditions was lower because of lack of enzymatic activity in the system.
摘要本研究采用小球藻光氧化法处理生物难分解污染物苯并[a]芘(BaP)。对不同实验条件下(不同生物量和光强)的模拟模型系统进行了评价。采用GC/MS技术定量分析BaP的减少情况。在光强度为13.5 W m−2的情况下，来自活藻培养的生物量(29%)的降解效率最高。当使用干生物质时，由于系统中缺乏酶活性，在相同条件下的降解率较低。
{"title":"Biodegradation of Benzo[a]Pyrene through the use of algae","authors":"A. Takáčová, M. Smolinská, J. Ryba, T. Mackuľak, Jana Jokrllová, P. Hronec, G. Čík","doi":"10.2478/s11532-014-0567-6","DOIUrl":"https://doi.org/10.2478/s11532-014-0567-6","url":null,"abstract":"AbstractIn this work for disposal of the biologically hard decomposed pollutant Benzo[a]Pyrene (BaP) photooxidation Chlorella kessleri was used. The simulation model system under the different experimental conditions (varying biomass and light intensity) was evaluated. For quantitative analysis of the decrease in BaP, GC/MS technique was used. The highest degradation efficiency was achieved in the case of biomass from the culture of live algae (29%) and light intensity at level of 13.5 W m−2. When the dry biomass was used, degradation under the same conditions was lower because of lack of enzymatic activity in the system.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"44 1","pages":"1133-1143"},"PeriodicalIF":0.0,"publicationDate":"2014-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77229786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-15DOI: 10.2478/s11532-014-0569-4
T. Kovács, M. Horváth, Z. Sas, B. D. Dung, Tran Khanh Minh
Smoking is one of the leading causes of preventable death. In recent years, numerous countries have initiated the prohibition of smoking in restaurants, workplaces and public spaces. The Vietnamese government intends to follow the precautions against public smoking as well. Over and above the number of some hazardous chemical components found in tobacco, 210Po isotope content could enhance the probability of the development of lung cancer. In this study 14 Vietnamese tobacco products (commercial cigarettes and pipe tobacco) 210Po activity concentration were determined using PIPS semiconductor alpha spectrometry. The results showed that the 210Po activity concentration of the investigated samples varied between 7.40 ± 1.09–128.64 ± 11.22 mBq g−1. The average 210Po content of commercial cigarettes was 15.5 mBq g−1, whilst the average of pipe tobacco was 20.4 mBq g−1. To estimate the risk of inhalation of 210Po isotopes originating as a result of smoking, dose estimations were carried out.
吸烟是可预防死亡的主要原因之一。近年来，许多国家已经开始禁止在餐馆、工作场所和公共场所吸烟。越南政府也打算遵循公共场所吸烟的预防措施。超过烟草中某些有害化学成分的含量，210Po同位素含量会增加肺癌发生的概率。采用PIPS半导体α光谱法测定了14种越南烟草制品(商品卷烟和烟斗卷烟)的210Po活性浓度。结果表明，所研究样品的210Po活性浓度在7.40±1.09 ~ 128.64±11.22 mBq g−1之间变化。商品卷烟的210Po平均含量为15.5 mBq g - 1，烟斗卷烟的210Po平均含量为20.4 mBq g - 1。为了估计吸入因吸烟而产生的210Po同位素的风险，进行了剂量估计。
{"title":"Determination of 210Po content of vietnamese tobacco samples","authors":"T. Kovács, M. Horváth, Z. Sas, B. D. Dung, Tran Khanh Minh","doi":"10.2478/s11532-014-0569-4","DOIUrl":"https://doi.org/10.2478/s11532-014-0569-4","url":null,"abstract":"Smoking is one of the leading causes of preventable death. In recent years, numerous countries have initiated the prohibition of smoking in restaurants, workplaces and public spaces. The Vietnamese government intends to follow the precautions against public smoking as well. Over and above the number of some hazardous chemical components found in tobacco, 210Po isotope content could enhance the probability of the development of lung cancer. In this study 14 Vietnamese tobacco products (commercial cigarettes and pipe tobacco) 210Po activity concentration were determined using PIPS semiconductor alpha spectrometry. The results showed that the 210Po activity concentration of the investigated samples varied between 7.40 ± 1.09–128.64 ± 11.22 mBq g−1. The average 210Po content of commercial cigarettes was 15.5 mBq g−1, whilst the average of pipe tobacco was 20.4 mBq g−1. To estimate the risk of inhalation of 210Po isotopes originating as a result of smoking, dose estimations were carried out.","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"82 1","pages":"1127-1132"},"PeriodicalIF":0.0,"publicationDate":"2014-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91244098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-12DOI: 10.2478/s11532-014-0571-x
S. Itkulova, G. D. Zakumbaeva, A. Mukazhanova, Y. Y. Nurmakanov
The new multicomponent Co-based catalysts with additives of group 8 metal and rare earth elements and supported on alumina have been tested in the dry and steam conversion of a model biogas. The processes were carried out in a flow quartz reactor under the following conditions: atmospheric pressure, a gas hourly space velocity of 1000 h−1 and temperatures of 300–800°C. The catalysts were characterised using electron microscopy, BET and X-ray analysis.The methane is almost completely converted in the dry reforming of biogas at T≤800°C. Synthesis gas with a ratio of H2/CO>1.0 is a main product of biogas reforming over the multicomponent catalysts studied. Adding steam in a feed composition increases both the methane conversion and the hydrogen yield at lower temperatures. Almost complete methane conversion occurs at T<750°C in the steam reforming of biogas. The catalysts are highly effective and exhibit stable activity throughout 100 h of continuous testing.
{"title":"Syngas production by biogas reforming over the Co-based multicomponent catalysts","authors":"S. Itkulova, G. D. Zakumbaeva, A. Mukazhanova, Y. Y. Nurmakanov","doi":"10.2478/s11532-014-0571-x","DOIUrl":"https://doi.org/10.2478/s11532-014-0571-x","url":null,"abstract":"The new multicomponent Co-based catalysts with additives of group 8 metal and rare earth elements and supported on alumina have been tested in the dry and steam conversion of a model biogas. The processes were carried out in a flow quartz reactor under the following conditions: atmospheric pressure, a gas hourly space velocity of 1000 h−1 and temperatures of 300–800°C. The catalysts were characterised using electron microscopy, BET and X-ray analysis.The methane is almost completely converted in the dry reforming of biogas at T≤800°C. Synthesis gas with a ratio of H2/CO>1.0 is a main product of biogas reforming over the multicomponent catalysts studied. Adding steam in a feed composition increases both the methane conversion and the hydrogen yield at lower temperatures. Almost complete methane conversion occurs at T<750°C in the steam reforming of biogas. The catalysts are highly effective and exhibit stable activity throughout 100 h of continuous testing.","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"33 1","pages":"1255-1261"},"PeriodicalIF":0.0,"publicationDate":"2014-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75561605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-06DOI: 10.2478/s11532-014-0560-0
R. Georgieva, A. Detcheva, Y. Dimitriev
AbstractThe present paper deals with chemical and physicochemical characterization of seven glass fragments of medieval glass bracelets from South-East Bulgaria. Samples were investigated by Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and differential thermal analysis (DTA). Gravimetric chemical analysis was used for silica assessment. Flame photometry was applied to determine sodium and potassium content while aluminium, calcium and magnesium were determined by flame atomic absorption spectrometry after dissolution using a mixture of acids. All investigated artefacts are soda-lime-silica glasses and when produced two different recipe norms were used. Important technological parameters of glass manufacturing were determined and discussed. This investigation throws light on the technological development and production of glass during medieval times.
{"title":"Chemical and technological characterization of medieval glass bracelets from South-East Bulgaria","authors":"R. Georgieva, A. Detcheva, Y. Dimitriev","doi":"10.2478/s11532-014-0560-0","DOIUrl":"https://doi.org/10.2478/s11532-014-0560-0","url":null,"abstract":"AbstractThe present paper deals with chemical and physicochemical characterization of seven glass fragments of medieval glass bracelets from South-East Bulgaria. Samples were investigated by Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and differential thermal analysis (DTA). Gravimetric chemical analysis was used for silica assessment. Flame photometry was applied to determine sodium and potassium content while aluminium, calcium and magnesium were determined by flame atomic absorption spectrometry after dissolution using a mixture of acids. All investigated artefacts are soda-lime-silica glasses and when produced two different recipe norms were used. Important technological parameters of glass manufacturing were determined and discussed. This investigation throws light on the technological development and production of glass during medieval times.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"11 1","pages":"1169-1175"},"PeriodicalIF":0.0,"publicationDate":"2014-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89776666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-06DOI: 10.2478/s11532-014-0566-7
S. Randjelovic, D. Kostić, G. Stojanović, S. Mitić, M. Mitić, B. Arsić, A. Pavlović
AbstractThe concentrations of Zn, Mn, Fe, Pb, Ni, Cu and Cd in soil, leaves and edible wild fruit (Crataegus laevigata L., Cornus mas L. and Prunus spinosa L.) from southeast Serbia were determined by atomic absorption spectroscopy. Metal translocations from soil to fruit were calculated as well as their oral intake and health risk indices. Positive correlations were found among metal concentrations in soil, leaves and fruit.
{"title":"Metals content of soil, leaves and wild fruit from Serbia","authors":"S. Randjelovic, D. Kostić, G. Stojanović, S. Mitić, M. Mitić, B. Arsić, A. Pavlović","doi":"10.2478/s11532-014-0566-7","DOIUrl":"https://doi.org/10.2478/s11532-014-0566-7","url":null,"abstract":"AbstractThe concentrations of Zn, Mn, Fe, Pb, Ni, Cu and Cd in soil, leaves and edible wild fruit (Crataegus laevigata L., Cornus mas L. and Prunus spinosa L.) from southeast Serbia were determined by atomic absorption spectroscopy. Metal translocations from soil to fruit were calculated as well as their oral intake and health risk indices. Positive correlations were found among metal concentrations in soil, leaves and fruit.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"14 1","pages":"1144-1151"},"PeriodicalIF":0.0,"publicationDate":"2014-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87524506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-06DOI: 10.2478/s11532-014-0565-8
Kornela Kasperczyk, Beata Orlińska, J. Zawadiak
Abstract4-Hexyloxycarbonyl-, 4-dodecyloxycarbonyl- and 4-hexadecyloxycarbonyl-N-hydroxyphthalimides were synthesised using trimellitic anhydride chloride as the starting material. The obtained lipophilic derivatives of N-hydroxyphthalimide were applied as catalysts of the cumene oxidation reaction with oxygen performed in polar acetonitrile, in non-polar tert-butylbenzene and in the absence of a solvent. The courses of reactions catalysed by N-hydroxyphthalimide and its derivatives were compared.
摘要以氯偏苯三酸酐为原料合成了4-己基氧羰基-、4-十二烷基氧羰基-和4-十六烷基氧羰基- n -羟基邻苯酞酰亚胺。得到的n-羟基邻苯亚胺亲脂衍生物作为催化剂，在极性乙腈、非极性叔丁基苯和无溶剂条件下进行了异丙烯的氧氧化反应。比较了n -羟基邻苯二胺及其衍生物催化反应的过程。
{"title":"Aerobic oxidation of cumene catalysed by 4-alkyloxycarbonyl-N-hydroxyphthalimide","authors":"Kornela Kasperczyk, Beata Orlińska, J. Zawadiak","doi":"10.2478/s11532-014-0565-8","DOIUrl":"https://doi.org/10.2478/s11532-014-0565-8","url":null,"abstract":"Abstract4-Hexyloxycarbonyl-, 4-dodecyloxycarbonyl- and 4-hexadecyloxycarbonyl-N-hydroxyphthalimides were synthesised using trimellitic anhydride chloride as the starting material. The obtained lipophilic derivatives of N-hydroxyphthalimide were applied as catalysts of the cumene oxidation reaction with oxygen performed in polar acetonitrile, in non-polar tert-butylbenzene and in the absence of a solvent. The courses of reactions catalysed by N-hydroxyphthalimide and its derivatives were compared.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"51 1","pages":"1176-1182"},"PeriodicalIF":0.0,"publicationDate":"2014-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78294765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-06DOI: 10.2478/s11532-014-0563-x
L. Votavová, K. Hanušová, Lukáš Vápenka, J. Dobiáš, F. Kvasnička
AbstractTwenty three paper based packaging materials commercially used for food packaging in the Czech Republic were analysed with regard to 2-phenylphenol (OPP) content using HPLC technique with fluorimetric detection. The HPLC method was modified with the aim to increase its sensitivity. OPP was detected in quantities ranging from 10 mg kg−1 to 527 mg kg−1 in twenty tested samples. The level of OPP in packaging materials was in close correlation to the content of recycled pulp in used paper material. The migration of OPP from two packaging materials comprised of paperboard coated with low density polyethylene (LDPE) into food simulants was determined at 40°C for 10 days. The levels of migration into 3% acetic acid, 10% ethanol and olive oil were below the limit of detection of used analytical procedure. In the case of 95% ethanol, 13% and 21% of OPP present in tested samples were transferred into simulant. The found occurrence of OPP in paper packages does not pose any significant safety risk for food consumer, but OPP could be considered as wide spread contaminant in paper materials.
摘要采用高效液相色谱-荧光法对捷克23种市售食品包装用纸中的2-苯基酚(OPP)含量进行了分析。对HPLC法进行了改进，以提高其灵敏度。在20个测试样品中检测到OPP的量从10 mg kg - 1到527 mg kg - 1不等。包装材料中OPP的含量与废纸中再生纸浆的含量密切相关。在40°C条件下，测定了两种包装材料(由涂有低密度聚乙烯(LDPE)的纸板组成)向食品模拟剂中的OPP迁移。对3%醋酸、10%乙醇和橄榄油的迁移量均低于常用分析方法的检出限。在95%乙醇的情况下，测试样品中存在的13%和21%的OPP被转移到模拟物中。纸包装中发现的OPP不会对食品消费者构成重大的安全风险，但OPP可以被认为是纸制品中广泛存在的污染物。
{"title":"Occurrence of 2-phenylphenol in food paper packages","authors":"L. Votavová, K. Hanušová, Lukáš Vápenka, J. Dobiáš, F. Kvasnička","doi":"10.2478/s11532-014-0563-x","DOIUrl":"https://doi.org/10.2478/s11532-014-0563-x","url":null,"abstract":"AbstractTwenty three paper based packaging materials commercially used for food packaging in the Czech Republic were analysed with regard to 2-phenylphenol (OPP) content using HPLC technique with fluorimetric detection. The HPLC method was modified with the aim to increase its sensitivity. OPP was detected in quantities ranging from 10 mg kg−1 to 527 mg kg−1 in twenty tested samples. The level of OPP in packaging materials was in close correlation to the content of recycled pulp in used paper material. The migration of OPP from two packaging materials comprised of paperboard coated with low density polyethylene (LDPE) into food simulants was determined at 40°C for 10 days. The levels of migration into 3% acetic acid, 10% ethanol and olive oil were below the limit of detection of used analytical procedure. In the case of 95% ethanol, 13% and 21% of OPP present in tested samples were transferred into simulant. The found occurrence of OPP in paper packages does not pose any significant safety risk for food consumer, but OPP could be considered as wide spread contaminant in paper materials.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"61 1","pages":"1162-1168"},"PeriodicalIF":0.0,"publicationDate":"2014-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77469867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-06DOI: 10.2478/s11532-014-0557-8
Xiaoning Zhang, Hongmei Hu
AbstractIn addition to its role as a carrier of genetic information, DNA has been recognized as a construction material for the assembly of different objects and structural arrangements with nanoscale features. As a result of DNA’s self-recognition properties (based on the specific base-pairing of G-C and T-A), monolayer films of nucleic acids on solid supports have attracted an escalating attentions. Recently, numerous novel materials based on two-dimensional (2D) and three-dimensional (3D) DNA structures have been reported, which extends their utility to a large number of appliations. This review paper intends to be a new and comprehensive overview of recent strategies to site-specifically immobilized DNA on various materials, including carbonaceous substances, gold, and silica substrate, emphasizing the applications of site-specific DNA nanostructure-based devices for diagnostic, bioanalytical, food safety and environmental monitoring. Additionally, an up-to-date perspective is proposed at the end of this review.
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