2018, Volume 64(68), Issue 3 (September)
Contents
pages 1- 8 Download
Simple and Rapid Spectrophotometric Method for Phenol Determination in Aqueous Media
ALEXANDRA GEORGIANA APOSTICĂ, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection
TATIANA ICHIM,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
VERONICA MĂDĂLINA RADU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
LAURA BULGARIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
lbulg@tuiasi.ro
pages 9 - 18 Download
Abstract
Simple and selective determination of phenol from aqueous
media was spectrophotometrically examined using ferric chloride as colour
reagent. The reaction between phenol and FeCl3 occurs rapidly (1-2 min),
without to be necessary the adjustment of solution pH. The visible spectra
of the purple complex, recorded against distilled water, show a maximum at
540 nm, and the absorbance remains stable for at least 10 hours. This method
allows the determination of phenol from aqueous media in a relatively wide
concentration range (0.09 – 2.30 mg·mL-1), with acceptable detection limits.
The interferences caused by methanol, ethanol, acetone and ethylic ether
were evaluated on the basis of the selectivity coefficients. The validation
of the proposed method was done by recovery tests of phenol in tap water.
Experimental results indicate that the proposed method allows a rapid and
simple quantitative determination of phenol in aqueous media, and can be
used to test the quality of industrial effluents.
Keywords: Phenol;
ferric chloride; spectrophotometric method; aqueous solution; industrial
applications.
A Suitable Method for Polyphenols Complexes with Copper
ROXANA-PETRONELA DAMASCHIN, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
VALENTIN I. POPA,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
IRINA VOLF, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, iwolf@tuiasi.ro
pages 19 - 29 Download
Abstract
Polyphenols represent a class of natural compounds with
significant bioactive attributes. One of the important property of
polyphenols is the complexing of ion metals. Following this process, some
complexes with impressive antioxidant properties could be obtained. The
literature lists several methods considering different polyphenols, ion
metals and reaction solution as well as experimental conditions including
concentration, pH and temperature. This great variety of possibilities
requires an analysis to establish the suitable reaction solution and the
main parameters as well as their range of variation. Withal, some
polyphenols model molecules have to be proposed.
Keywords: polyphenols;
metal ions; complex combination; reaction solution and parameters.
Synthesis, Characterization and Biological Activity Evaluation of Some Divalent Tranzitional Metals Complexes with N-p-Nitrobenzoyl-D-L- Phenylglycine
CĂTĂLINA ROŞCA, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
VALERIU ŞUNEL, "Alexandru Ioan
Cuza" University of Iaşi, Romania, Faculty of Chemistry
MIHAELA CREŢU,
"Alexandru Ioan Cuza" University of Iaşi, Romania, Faculty of Chemistry
MARIANA
DIACONU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
DANIEL MARECI, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection
CARMEN MÎŢĂ,
"Alexandru Ioan Cuza" University of Iaşi, Romania, Faculty of Chemistry
CORNEL STAN, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
GABRIELA
ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
DANIEL SUTIMAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, sutiman@ch.tuiasi.ro
pages 31- 48 Download
Abstract
This paper presents the synthesis of some Mn(II), Co(II),
Ni(II) and Cu(II) complexes with N-p-nitrobenzoyl-D-L-phenylglycine (NBPG)
as ligand. The characterization of the above mentioned synthesised compounds
involved the structure determination by elemental analysis, FTIR
spectroscopy, X-ray diffraction (XRD) and electron spin resonance (ESR).
Experimental data sustain that all Mn, Co, Ni and Cu derivatives of
N-p-nitrobenzoyl-D-L-phenylglycine present a crystalline structure framed
orthorhombic system and are thermally stable up to temperatures above 100°C.
The results of the toxicity tests on mice indicated that the lowest value of
the lethal dose is displayed by the Cu complex compound. The antibacterial
and antifungal activities investigations revealed that the Co[(L)2(H2O)2]
compound displays the best antibacterial properties while the Cu[(L)2(H2O)2]
compound presents the best antifungal properties.
Keywords:
antibacterial and antifungal activity; divalent transitional metals
complexes; ESR; FTIR; N-p-nitrobenzoyl-D-L-phenylglycine; XRD.
Antimicrobial Properties and Importance of Tannins for the Food Industry
ANCA MIHAELA MOCANU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection, ancamocanu@ch.tuiasi.ro
pages 49 - 56 Download
Abstract
The present paper is aimed to perform extended studies on
the tannins extracted from the green nuts with a special attention paid to
the separation methods and testing of the anti-microbial activity against
some gram- positive and gram-negative micro-organisms as well as against the
fungi. For finding the optimum extraction method the extractions by
mechanical stirring and in ultrasonic field were carried out while the
polyphenolic compounds were determined by applying the spectrophotometric
method. The sensitivity of micro-organisms toward the tannin compounds was
tested under the optimum standard conditions. Following the antibacterial
test the inhibitory action of the tannin compounds on the microorganisms
under study was estimated which affords their use in food industry by adding
them in various food products (cake creams, certain sausage and cheese
types).
Keywords: green nuts; separation methods; microorganisms;
difusimetric method; tested activity.
Effect of Surface Morphology on Cell Growth on Polyester Films Immobilized with Biomolecules
MIOARA DROBOTĂ, "Petru Poni" Institute of
Macromolecular Chemistry, Iași, Romania,
miamiara@icmpp.ro
GRAȚIELA PIRCALABIORU, Sanimed International Impex S.R.L,
București, Romania; Research Institute of University of Bucharest, Romania
MARIA
BUTNARU, Biomedical Sciences "Grigore T. Popa" University of
Medicine and Pharmacy, Iași, Romania
pages 57 - 66 Download
Abstract
There are many methods to modify the surface properties of
the polymer films, such as chemical, mechanical, enzymatic or physical
treatments. The polyesters are frequently used to improve the adhesion of
the proteins and cells due to their excellent surfaces properties. The
purpose of this study was to monitoring changed surfaces in order to
improved proteins anchoring on the surface. Polyethylene terephthalate (PET)
was the designated polymer due its excellent properties. The surface of this
polymer has been investigated regarding the interactions of the polymer
surface with proteins after UV functionalization for improving the adhesion
properties using methods such as FTIR spectroscopy, scanning electron
microscopy (SEM), contact angle, and biocompatibility tests.
Keywords:
cells; gelatine; hybrid materials; polar groups; UV functionalization.