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p. 309-317
Received: 9 April 2006; in revised form: 27 April 2006 / Accepted: 27 April 2006 / Published: 29 April 2006
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| Download PDF Full-text (142 KB) Abstract: Electrocoagulation of a plant extract and certain substances representative of selected classes of plant pigments, viz. chlorophyll, a carotenoid, a phenolic substance and a tannin, was performed in ethanol containing varying amounts of water (15-75%). The results showed that the extent and efficiency of coagulation of these substances tends to vary in a manner directly related to the water content of the solvent, although the tannin and the phenolic substance were less sensitive to the solvent composition and are equally well coagulated in all solvent systems studied. The findings can be applied to the removal of these substances from aqueous alcoholic plant extracts using the electrocoagulation technique.
p. 318-324
Received: 15 December 2005; in revised form: 24 March 2006 / Accepted: 5 May 2006 / Published: 9 May 2006
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| Download PDF Full-text (48 KB) Abstract: A one-step, simple and straightforward synthesis of the title amides from the corresponding carboxylic acids, urea and imidazole under microwave irradiation is described.
p. 325-333
Received: 4 April 2006; in revised form: 20 April 2006 / Accepted: 24 April 2006 / Published: 9 May 2006
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| Download PDF Full-text (67 KB) Abstract: Novel derivatives of 6-amino-2-phenylbenzothiazole bearing differentsubstituents (amino, dimethylamino or fluoro) on the phenyl ring were prepared as thecorresponding hydrochloride salts. 6-Nitro-2-(substituted-phenyl)benzothiazoles (1-6) weresynthesized by condensation reactions of substituted benzaldehydes with 2-amino-5-nitrothiophenol. Nitro derivatives were reduced to the amino derivatives with SnCl2 /HCl.Water soluble hydrochloride salts of 6-amino-2-(substituted-phenyl)benzothiazole (13-19)were prepared using concentrated or gaseous HCl. Compounds 13-19 were found to exertcytostatic activities against malignant human cell lines: cervical (HeLa), breast (MCF-7),colon (CaCo-2), laryngeal carcinoma (Hep-2), and normal human fibroblast cell lines (WI-38).
p. 334-344
Received: 15 April 2006 / Accepted: 9 May 2006 / Published: 10 May 2006
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| Download PDF Full-text (129 KB) Abstract: In this paper we report a comparative characterization of Small UnilamellarVesicles (SUVs), Large Unilamellar Vesicles (LUVs) and Multilamellar Vesicles (MLVs)prepared from 1-palmitoyl-2-oleoyl-sn-glycero-3-phospatidylcholine (POPC), carried outusing two NMR techniques, namely High Resolution NMR in solution and HighResolution–Magic Angle Spinning (HR-MAS). The size and size distributions of thesevesicles were investigated using the dynamic light scattering technique. An improvedassignment of the 1 H-NMR spectrum of MLVs is also reported.
p. 345-356
Received: 20 December 2005; in revised form: 5 May 2006 / Accepted: 5 May 2006 / Published: 17 May 2006
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| Download PDF Full-text (101 KB) Abstract: We report the synthesis of two novel Gd(III)-complexes derived from linear and macrocyclic polyaminopolycarboxylic acids 1 and 2, which contain a 3,5- dimethylpyrazolyl-ethyl arm, and a study of their relaxivity properties. The relationships between the experimental and theoretical results have provided interesting information about the kinetic and thermodynamic stability of these complexes.
p. 357-364
Received: 16 December 2005; in revised form: 10 February 2006 / Accepted: 12 February 2006 / Published: 10 May 2006
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| Download PDF Full-text (75 KB) Abstract: We present an easy method for the synthesis of β-ketoesters starting from variouscarbocyclic and heterocyclic carboxylic acids and esters. The β-ketoester side-chain wasintroduced by a sequence involving α-deprotonation and quenching with CO2 , conversion tothe corresponding acid chloride and subsequent chain elongation using deprotonated ethylacetate.
p. 365-369
Received: 22 February 2006 / Accepted: 7 March 2006 / Published: 12 May 2006
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| Download PDF Full-text (37 KB) Abstract: Highly selective enzymatic reductions of aldehydes to the corresponding alcohols was performed using an E. coli JM109 whole cell biocatalyst. A selective enzymatic method for the reduction of aldehydes could provide an eco-compatible alternative to chemical methods. The simplicity, fairly wide scope and the very high observed chemoselectivity of this approach are its most unique features.
p. 370
Received: 10 May 2006 / Published: 12 May 2006
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| Download PDF Full-text (12 KB) Abstract: n/a
p. 371-376
Received: 5 May 2006; in revised form: 15 May 2006 / Accepted: 16 May 2006 / Published: 16 May 2006
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| Download PDF Full-text (58 KB) Abstract: Novel 3-acetyl-2-aminothiophenes were prepared from cyanoacetone and1,4-dithianyl-2,5-diols using a modified Gewald reaction. The syntheses of thecorresponding acetamides, as well as that of 3-acetyl-2-amino-5-nitrothiophene – aninteresting building-block for thiophene azo dyes – are reported. Detailed spectroscopicinvestigations (1 H-NMR, 13 C-NMR, MS, IR) of the obtained compounds are presented.
p. 377-382
Received: 10 October 2005 / Accepted: 15 May 2006 / Published: 27 May 2006
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| Download PDF Full-text (46 KB) Abstract: New derivatives of 5(4H)-quinazolinone containing 2-imidazolin-5-one rings have been prepared from 5(4H)-oxazolone derivatives.
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