Synthesis of egonol derivatives and their antimicrobial activities

WOS: 000287419000021PubMed ID: 21251840Eighteen derivatives of egonol (A-R) were synthesized and evaluated for their antimicrobial activities against Staphylococcus aureus ATCC 29213, Bacillus subtilis ATCC 6633, Candida albicans ATCC 10231 and Escherichia coli ATCC 8739 microorganisms comparing with egonol. The obtained data reported that compound B exhibited improved activities against all tested bacteria than egonol, others have shown different range of activities. (C) 2010 Elsevier Ltd. All rights reserved.TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [105T226]; Ege University Research FoundationEge University [2005 Fen 047]; Ege University ScienceEge University; Technology Application and Research Center [2007 Bil 036]This work was supported by TUBITAK (105T226), Ege University Research Foundation (2005 Fen 047) and Ege University Science, Technology Application and Research Center (2007 Bil 036). The authors thank Professor Dr. Misir Ahmedzade for his valuable suggestions for synthetic routes and also Assoc. Professor Dr. Yurdanur AKGUL for her assistance in some of the NMR analyses

Char and Coke Formation as Unwanted Side Reaction of the Hydrothermal Biomass Gasification

WOS: 000261134400002The hydrothermal biomass gasification is a promising technology, to produce hydrogen and/or methane from wet biomass with a water Content of >= 80% (g/g). In the process, the coke formation usually is very low, but already low amounts problems like, e.g., fouling in the heat exchanger. To learn more about the product formation, the results of the hydrothermal treatment (at 400, 500, 600 degrees C and 1 h) of different biomass feedstocks (artichoke stalk, pinecone, sawdust, and cellulose as model biomass) in a microreactor are compared. The gas composition and the total organic carbon content of the aqueous phase were determined after reaction. The gas formation rises with increasing temperature. The formation of carbon deposits and their characterization has been investigated by scanning electron microscopy (SEM). The variation of the solid morphology during the hydrothermal conversion is discussed based on chemical pathways occurring during hydrothermal biomass degradation.DAAD (German Academic Exchange Service)Deutscher Akademischer Austausch Dienst (DAAD)The authors gratefully acknowledge A. Bohm and A. Lauten-bach for TOC analysis. Our special thanks are to F. Schubel and J. Lamla for mechanical Support and to W. Habicht for SEM analysis. The authors Would also like to acknowledge DAAD (German Academic Exchange Service) for financially Supporting Dr. Ali Sinag and Dr. Tainer Karayildirim through the re-invitation program

Characterisation of products from pyrolysis of waste sludges

Abstract The pyrolysis of waste sludges was investigated using thermogravimetry/mass spectrometry (TG/MS) and a fixed-bed reactor. Two types of sludge were used, namely mixed sludge and oil sludge. In TGA/MS measurements, two degradation steps were observed. Degradation of organic structures, in sludge took place in the first step, while inorganic materials in sludge were mainly decomposed in a second step (above 500 8C). In a fixed-bed reactor, the catalytic effect of inorganic matter in addition to organic matter was monitored the quality and yield of products from pyrolysis. Pyrolysis of oil sludge produced a larger amount of oil containing more aliphatic compounds and a high calorific value. On the other hand, pyrolysis of mixed sludge gave a smaller amount of oil being rich in polar compounds. The gaseous products from pyrolysis consist of high amount of combustable gases. Landfilling was found to be the best alternative to dispose off the pyrolytic char obtained from pyrolysis.

Determination of Some Chemical Parameters and Antimicrobial Activity of Traditional Food: Mesir Paste

WOS: 000282365600024PubMed ID: 20626237The antimicrobial activities and some chemical properties of the traditional Turkish food called mesir paste were studied. Results of chemical analysis for moisture and volatiles, water-insoluble components, refractive index, soluble solids content, raw fiber, invert sugar, total ash, 5-hydroxymethylfurfural, acidity, and pH were calculated as 17.06%, 2.55%, 1.491, 80.2%, 0.70%, 40.54%, 0.13%, 44 mg/kg, 0.9% anhydrous citric acid, and 3.6, respectively. Mesir paste was extracted individually by six solvents with different polarity, and antimicrobial activities of each extracts were determined against 12 microbial strains, mostly food-borne, including pathogens, by the agar well diffusion method. All extracts obtained showed antimicrobial activity ranging from 8 mm to 40 mm, and the butanolic extract displayed stronger antimicrobial activity against all tested microorganisms; Gram-positive strains were found to be more sensitive than Gram-negative strains. Antimicrobial potency of n-butanol extracts of mesir paste was determined in term of minimal inhibitory concentration and minimal bactericidal concentration for the sensitive microorganisms. In addition, some commercial antibiotics such as ampicillin, gentamicin, and nystatin were used as positive controls to determine the sensitivity of the strains

Characterisation of products from pyrolysis of waste sludges

WOS: 000237998300024The pyrolysis of waste sludges was investigated using thermogravimetry/mass spectrometry (TG/MS) and a fixed-bed reactor. Two types of sludge were used, namely mixed sludge and oil sludge. In TGA/MS measurements, two degradation steps were observed. Degradation of organic structures, in sludge took place in the first step, while inorganic materials in sludge were mainly decomposed in a second step (above 500 degrees C). In a fixed-bed reactor, the catalytic effect of inorganic matter in addition to organic matter was monitored the quality and yield of products from pyrolysis. Pyrolysis of oil sludge produced a larger amount of oil containing more aliphatic compounds and a high calorific value. On the other hand, pyrolysis of mixed sludge gave a smaller amount of oil being rich in polar compounds. The gaseous products from pyrolysis consist of high amount of combustable gases. Landfilling was found to be the best alternative to dispose off the pyrolytic char obtained from pyrolysis. (C) 2005 Elsevier Ltd. All rights reserved