2019, Volume 65(69), Issue 1 (March)

Contents

pages 1- 8    Download

The Most Efficient Processing Methods for Retaining the Medical Properties of Tam Jalapeno Chili Peppers

CLAUDIA COBZARU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
ALEXANDRA CIUBOTARIU (GHEMEȘ), "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection, ccernatescu@yahoo.com

pages 9 - 16    Download
Abstract
This study aims to establish the best processing methods for chili pepper, Tam Jalapeno variety that maintains its medicinal properties. Chili pepper has been processed by irradiation, dehydration, freezing, preservation as jam and maceration in vinegar, oil and brine. The medicinal properties of chili pepper were analysed for vitamin C content, Scoville hot scale and qualitative analysis of capsaicin by thin layer chromatography (TLC). Experimental data shows that the most effective methods for conservation that maintains its medicinal properties are: dehydration, preservation in brine, maceration in oil and as jam.
Keywords: chilli; maceration; irradiation; dehydration. Synthesis,

Characterization and Toxicity Analysis of Some Divalent Transition Metals Complexes With N-(p-nitrobenzoyl)-L-glycine

CĂTĂLINA ROȘCA, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
VALERIU ȘUNEL, "Alexandru Ioan Cuza" University of Iași, Romania, Faculty of Chemistry
MIHAELA CREȚU, "Alexandru Ioan Cuza" University of Iași, Romania, Faculty of Chemistry
MARIANA DIACONU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
BOGDAN ISTRATE, "Gheorghe Asachi" Technical University of Iași, Romania, Faculty of Mechanical Engineering
GABRIELA LISĂ, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
MIHAI IMBRIȘCĂ, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORNELIU 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 17 - 33    Download
Abstract
This paper presents the synthesis, structural and physico-chemical characterization of Mn(II), Co(II), Ni(II) and Cu(II) complexes with N-(p-nitrobenzoyl)-L-glycine as ligand. Firstly, four complexes were synthesized in 1:2 molar ratio, followed by their characterization and determination of their toxic potential (toxicity lethal dose) as well analysis of some antifungal and antibacterial properties. The characterization step involved the structure investigation by elemental analysis, FTIR spectroscopy, XRD, ESR and the thermal stability. Experimental data shows that all compounds have a crystalline structure (orthorhombic system) and are thermally stable up to temperatures above 100°C. Toxicity tests of new compounds were run on mice and the results indicate that the lowest value of the lethal dose is displayed by the copper compound. The biological and antifungal activities were investigated for all compounds, the cobalt compound displays the best antibacterial properties and the copper compound presents the best antifungal properties.
Keywords: divalent transitional metals complexes; N-(p-nitrobenzoyl)-L-glycine; XRD; FTIR; ESR; antibacterial and antifungal activity.

Textile Effluent Discoloration by Sorption onto Mesotrophic Peat

CARMEN ZAHARIA, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection, czah@ch.tuiasi.ro

pages 35 - 44    Download
Abstract
The paper presents a few laboratory tests of adsorption onto mesotrophic peat (MP) applied to decolorize a real textile effluent by using the ‘batchwise’ sorption technique. For high efficiency of textile effluent discoloration, there were tested the following operating parameters: pH (1.6 - 10.86), sorbent dose (4 - 40 g/L), temperature (5°, 25° and 45°C), and sorption time (till 24 h). The best sorption performance was obtained at high acidic pH (1.6), with MP peat dose of 20 - 40 g/L, temperature of 25°C, initial intermittent agitation (no more than 3 - 5 min), continuous sorption operating regime, a minimum contact time of 780, or 840 min, and was varied between 53.50% and 57.25% for color removal, and also 47.04% - 51.80% for CODCr removal. To increase the textile effluent treatment degree can be applied also other physical-chemical or biological treatment steps (i.e. coagulation-flocculation, advanced oxidation/reduction, membrane processes as ultrafiltration, ionic exchange, etc.).
Keywords: adsorption; discoloration; textile effluent; mesotrophic peat (MP); treatment efficiency.

Simple and Rapid Spectrophotometric Determination of Au(III) Ions Using Rhodamine B As Colour Reagent

GABRIELA-TANIA DOGARU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
ELENA FILIPOV, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
IUSTINA VĂLIANU, "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@ch.tuiasi.ro

pages 45 - 55    Download
Abstract
In this study a simple spectrophotometric method is proposed for the rapid determination of Au(III) ions from aqueous solution. The proposed method use Rhodamine B as colour reagent, and the reaction occurs immediately in strong acid media (2 N HCl solution). The purple complex shows a maximum of adsorption at 520 nm, against a blank solution. The method allows the determination of Au(III) ions in a concentration range of 1.5 – 3.5 μg·mL-1, with a molar absortivity of 8.71·105 L·mol-1·cm-1 and a detection limit of 0.18 μg·mL-1. Although the method exhibits a relatively good selectivity over other heavy metals (Pb(II), Cu(II) and Cd(II)) which may be present in different real samples, the constituents of water samples drastically interfere with the determination of ions Au(III) by the proposed spectrophotometric method, which makes this method can only be used for the analysis of laboratory solutions.
Keywords: Au(III) determination; Rhodamine B; aqueous solution; spectrophotometry; simple analysis method.

Valorization of Residual Biomass as Biosorbent: Study of Biosorption Brilliant Red Dye from Aqueos Media

IOANA LUIZA HORCIU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
ALEXANDRA CRISTINA BLAGA, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
SONIA DASCĂLU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
DANIELA ȘUTEU, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection

pages 57 - 68    Download
Abstract
A direction for the use of immobilized biomass is to obtain biosorbents to be utilized inbiosorption process of chemical pollutants applied as specific step in the treatment of industrial wastewater. The non-living Bacillus sp. and Aspergillus sp. biomass immobilized in alginate has been studied for use as a biosorbent to remove Brilliant Red HE-3B organic dye from aqueous medium. Batch experimental studies were focused on determining the influence of certain physical-chemical operating parameters of the biosorption process of the dye, such as: temperature, pH, biosorbent dose, phase contact time, chemical compound concentrations, and dose of biomass.
Keywords: biosorbent; biosorption; organic chemical pollutants; immobilization; residual biomass.