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Gas sensitivity of polyaniline/SnO_2 hybrids to volatile organic compounds

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中国有色金属学会会刊：英文版 2009年第S3期19卷 678-683页

作者：耿丽娜 Department of Chemistry Hebei Normal University

Polyaniline (PAn) was prepared by chemical oxidation polymerization and characterized by FT-IR. PAn/SnO2 materials with different mass fractions of PAn were prepared by mechanical mixing. Compared with single PAn and SnO2, the gas sensitivity of PAn/SnO2 materials to volatile organic compounds (VOCs, methanol, ethanol and acetone) was studied. The possible response mechanism of PAn/SnO2 materials to VOCs was also discussed. It is found that PAn/SnO2 materials have gas sensitivity to VOCs at 90 ℃ among the four operating temperatures (room temperature, 30, 60 and 90 ℃), but PAn and SnO2 have no gas sensitivity at the above temperatures. The sensitivity of PAn/SnO2 materials shows linear increase with the increase of methanol concentration, but saturation with the increase of ethanol and acetone concentrations. PAn/SnO2 materials have high selectivity, fast response-recovery time and low operation temperature to VOCs, but pure PAn and SnO2 do not have.

关键词： gas sensitivity polyaniline/SnO2 volatile organic compounds

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气质联用仪对烟草中含氮杂环化合物的测定

分析测试学报 2008年第S1期27卷 88-89,92页

作者：蒋次清耿永勤王璐王岚李忠云南烟草科学研究院云南昆明650106

A method of gas chromatography-mass spectrometry(GC-MS) for the determination of nitrogen-heterocyclic compounds such as pyrazines,pyridines and pyrrols in tobacco was developed.The content changes of nitrogen-heterocyclic compounds in different tobacco position,grade of maturity,nitrogenous fertilizer quantity,tobacco growing area,flue-cured progress,and cigarette quality were studied.

关键词： tobacco nitrogen-heterocyclic compounds GC-MS

The Role of Soluble, Insoluble Fibers and Their Bioactive compounds in Cancer: A Mini Review

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Food and Nutrition Sciences 2015年第1期6卷 1-11页

作者： Dimitrios Papandreou Zujaja Tul Noor Maitha Rashed Department of Natural Sciences & Public Health CSSH Zayed University Abu Dhabi UAE

The cancer incidence has risen dramatically over the last decades. About 8 million people died globally according to latest reports, which represented almost 40% more than it was 20 years ago. Risk factors for the development of cancer have been found to include smoking, alcohol, drugs, obesity and diet. Fiber intake has shown to exhibit chemoprotective effects on cancer proliferation and metastasis that may seem to be very promising. This article will review the role of different types of fiber such as, cellulose, lignin, pectin and inulin in development and prevention of different types of cancers. This article would also discuss the effectiveness of both types of fiber in cancer prevention.

关键词： Fiber Cancer Insoluble Soluble Bioactive compounds

Analysis of the Fatty Acids and Phenolic compounds in a Cereal-Based Fermented Food (Tarhana)

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Food and Nutrition Sciences 2014年第13期5卷 1177-1184页

作者： Maribel Ovando-Martinez Orhan Daglioglu Umit Gecgel Senay Simsek Department of Food Engineering College of Agriculture Namik Kemal University Tekirdag Turkey Department of Plant Sciences North Dakota State University Fargo USA

Tarhana is a Turkish home-made fermented food product. The mixture of wheat flour, yoghurt, yeast, cooked vegetables, salt, and spices is fermented for 1 - 7 days. Tarhana is sun dried and ground for preparation of instant Tarhana powder. Color, phenolic compounds and fatty acid composition were determined for home-made Tarhana, collected from 4 cities in the Thrace Region of Turkey. Color and phenolic content were significantly different (P compounds and their effect on peroxidation of lipids in Tarhana should be tested in future studies.

关键词： Tarhana Phenolic compounds Fatty Acid Composition

Multiple Response Optimization of High Temperature, Low Time Aqueous Extraction Process of Phenolic compounds from Grape Byproducts

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Food and Nutrition Sciences 2014年第4期5卷 351-360页

作者： Hiba N. Rajha Nicolas Louka Nada El Darra Zeina Hobaika Nadia Boussetta Eugène Vorobiev Richard G. Maroun Centre d’Analyses et de Recherche UR TVA Faculté des Sciences Université Saint-Joseph de Beyrouth Lebanon Centre d’Analyses et de Recherche UR TVA Faculté des Sciences Université Saint-Joseph de Beyrouth Lebanon UTC/ESCOM EA 4297 TIMR Département de Génie des Procédés Industriels Laboratoire Transformations Intégrées de la Matière Renouvelable Université de Technologie de Compiègne Centre de Recherche de Royallieu Compiègne France. UTC/ESCOM EA 4297 TIMR Département de Génie des Procédés Industriels Laboratoire Transformations Intégrées de la Matière Renouvelable Université de Technologie de Compiègne Centre de Recherche de Royallieu Compiègne France

In this study phenolic compounds extraction from grape byproducts was conducted using pure water as a solvent. High temperatures and low time incubation periods were used in the aim of reducing the cost of the process and heightening the phenolic compounds yield. Response surface methodology (RSM) was realized to study the effect of time and temperature on crushed and uncrushed grape pomace. The phenolic content was evaluated considering the quantity (total phenolics (TPC), flavonoids (FC), total monomeric anthocyanins (TMA) and tannins (TC)), and quality (antiradical activity (AA) and antioxidant capacity (AC)) of the extracts. High temperature low time extraction design used in this study was compared to the extraction process at moderate temperatures with relatively long periods of time. This was proved to ameliorate the quantitative extraction of phenolic compounds from grape pomace without affecting their bioactivity. Moreover, multiple response optimization showed the optimal extraction parameters to be 81?C and 140 minutes for the unmilled pomace samples, and 88?C and 5 minutes for the milled. TPC, FC, TMA, TC, AA and AC are almost the same for both optimums. Thus the possibility of replacing the milling process by the extraction time prolongation (for the unmilled pomace) of 135 minutes seems to be very plausible. HPLC analysis showed different quantity and diversity of extracted phenolics for the optimums. However this difference did not significantly affect the overall activity, showing that PC in the different extracts act in complete synergy all together leading to important biological properties. The obtained results using the extraction strategy adopted in this work could lead to several industrial applications.

关键词： Phenolic compounds Grape Byproducts Optimization Aqueous Extraction Response Surface Methodology

Identification and Recovery of Volatiles Organic compounds (VOCs) in the Coffee-Producing Wastewater

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Journal of Water Resource and Protection 2014年第4期6卷 375-380页

作者： Alcilucia Oliveira Lourdes M. C. Cabral Humberto Bizzo Neusa P. Arruda Suely P. Freitas Embrapa Food Technology Instituto Federal do Rio de Janeiro Universidade Federal do Rio de Janeiro Escola de Química

The objectives of the present study were to recover and identify volatiles organic compounds (VOCs) in the wastewater (WW) coming from a soluble coffee industrial plant. For VOCs recover, the WW was concentrated by pervaporation using a polydimethylsiloxane (PDMS) membrane. Furthermore, the solid phase micro extraction (SPME) and gas chromatography-mass spectrometry (GC-MS) were used for VOCs identification. The multivariate method of principal component analysis (PCA) was performed to evaluate differences amongst the feed and concentrate streams. Regarding the number of VOCs identified in the wastewater (33) and permeate (72), a significant statistical difference at p Clusters discriminating were clearly observed, as the feed and permeate streams are compared. Thus, we can conclude that pervaporation process using a PDMS membrane was effective to recover different class of VOCs present in the aqueous effluent and can be recommended for industrial wastewater treatment.

关键词： Wastewater Volatile compounds Pervaporation Instant Coffee Industry

Organotin compounds in Sediments of Northern Lakes, Egypt

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Journal of Environmental Protection 2014年第17期5卷 1654-1666页

作者： Mohamed A. Shreadah Safaa A. Abdel Ghani Hamada B. I. Hawash Asia Abd El Samie Abd El Moniem M. Ahmed National Institute of Oceanography and Fisheries Alexandria Egypt Chemistry Department Faculty of Science Alexandria University Alexandria Egypt

This pioneered study is aimed to determine the levels and distributions of organotin compounds (OTCs) in sediment samples collected from five Egyptian lakes located in the southern-eastern Mediterranean Sea. The paper has given an account of and the reasons for the widespread distribution of Tributyltin (TBT) in northern lakes. The percentage of TBT ranged from 4% - 100% OTC revealing recent inputs of TBT. The highest average of TBT (2.84 μg/g Sn dry wt) was measured in lake Edku. Dibutyltin (DBT) was observed at most sampled sites. Relatively higher abundance of DBT was observed in sediments of EL-Burullus (0.69 μg/g Sn dry wt). One of most significant findings to emerge from this study is the absence of any strong and significant correlation between TBT and DBT in sediments from five northern lakes. The absence of such correlation might give a clear evidence that both compounds did not come from the same source. The observed OTC levels indicate some highly localized areas of contamination which are severe enough to cause harmful effects on marine flora and fauna. Except for El-Burllus, Triphenyltin (TPhT) was not measured in sediments of most stations. TPhT was the predominant species in El-Burullus, which indicate a source of pollution mostly originated from industrial and agricultural waste water discharge, organic wastes, commercial fertilizers, chemical wastes and pesticides. The percentages of OTC to total tin ranged from 1% to 35%. El-Brullus, Edku and El-Bardaweel exhibited the highest percentages. As a result of lack of enforcement on the control of OTC, the study has thrown up many questions need further detailed environmental assessment of OTC.

关键词： Organotin compounds Sediments Lakes Egypt

High-throughput screening for compounds for pro-hematopoiesis using zebrafish primary blastomere cultured cells

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High-throughput screening for compounds for pro-hematopoiesi...

Biodegradation of Toxic compounds in Olive Mill Wastewater by a Newly Isolated Potent Strain: <i>Aspergillus niger</i>van Tieghem

细胞—生命的基础——中国细胞生物学学会2013年全国学...

作者： Jing-Xia Liu Ilya Shestopalov Cong Xu Bogdan Madhumita Yi Zhou Willam Yi Leonard IZon Institute of Hydrobiology Chinese Academy of Sciences Stem Cell Program and Hematology/Oncology Children's Hospital and Dana-Farber Cancer InstituteHarvard Stem Cell InstituteHarvard Medical School Howard Hughes Medical Institute/Children's Hospital

Generation of hematopoietic stem and progenitor cells in vitro,especially generation of safe therapeutic hematopoietic stem cells,still remain inefficient because lack of effective and safe technology.Zebrafish has proved to be a facile system for chemical genetics,and has been used to identify a variety of pathways regulating organogenesis including hematopoiesis.In this study,we

关键词： High-throughput screening primary blastomere cultured cells embryonic stem cells pro-hematopoiesis compounds

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Journal of Water Resource and Protection 2013年第8期5卷 768-774页

作者： Fatiha Hanafi Mohammed Mountadar Samira Etahiri Mohamed Fekhaoui Omar Assobhei Département de Zoologie et Ecologie Animale Institut Scientifique Université Mohammed V-Agdal Rabat Morocco Laboratoire de Biotechnologies Marine et de l’Environnement Faculté des Sciences Université Chouaib Doukkali El Jadida Morocco Laboratoire de Biotechnologies Marine et de l’Environnement Faculté des Sciences Université Chouaib Doukkali El Jadida Morocco Unité de Chimie Analytique et Sciences de l’Environnement Faculté des Sciences Université Chouaib Doukkali El Jadida Morocco

Thirty-two strains isolated from olive oil production plants were screened for their tolerance to the polyphenols and their ability to grow in olive oil mill wastewaters (OMW). An Ascomycete isolate that grew best on OMW was selected for further study to evaluate its effect on removal of organic pollutants, phenolic compounds and OMW toxicity. This strain was identified by DSMZ as Aspergillus niger van Tieghem. The growth of Aspergillus niger van Tieghem on stored OMW decreased pH and led to the reduction of phenolic compounds with a resultant discoloration of OMW and significant reduction of chemical oxygen demand (COD), in proportion to the dilution of OMW. The reduction of the COD, phenolics and color exceeded 50%. Tannase, the enzyme detected in the growth medium of Aspergillus niger van Tieghem was produced during primary metabolic growth. The maximal enzyme activity attaining 0.68 EU/ml was achieved in 3rd days of cultivation. The phytotoxicity of the stored OMW was reduced to about 40% after 4 days’ incubation with Aspergillus niger van Tieghem.

关键词： Aspergillus niger van Tieghem Olive Oil Mill Wastewaters Phenolic compounds Tannase Toxicity