2021, Issue 67(71), Fasc. 2 (June)
Contents
pages 1- 8 Download
Lycopene – Background, Perspectives and Challenges in Dermato-Cosmetic Formulas
DELIA TURCOV, “Gheorghe Asachi” Technical University of Iași, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iași, Romania
ANCA ZBRANCA, “Grigore T.Popa” University of Medicine and
Pharmacy, Faculty of Medical Bioengineering, Iași, Romania
LĂCRĂMIOARA
RUSU, “Vasile Alecsandri” University of Bacău, Faculty of Engineering,
Bacău, Romania
DANIELA ȘUTEU, “Gheorghe Asachi” Technical University of
Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection, Iași, Romania,
danasuteu67@yahoo.com
pages 9 - 21 Download
Abstract
In the dermato-cosmetic formulation, the antioxidants have
gained an almost permanent place based on strong scientific arguments. The
most of the antioxidant ingredients enriched formulas are intended for
antiaging skincare products, even though in a wide variety of presentation
forms, these have no special indications and are limited to daily skincare
routine for healthy skin. Nevertheless, there is an increasing interest for
antioxidant compounds also for dermatocosmetic products with medical
indications for acne, rosacea, and seborrheic dermatitis. Therefore, finding
new resources or fructification of any discovered source of antioxidant
compounds have led to increasing the researches related to performance,
stability, efficiency and quality of extraction methods. Special attention
to indigenous plant resources, economical and rich in antioxidant active
ingredients is as well inherent but also incipient, if we have to consider
the amount of well-known but still unexploited active ingredients.
Keywords: antioxidant effects; dermatocosmetic products; lycopene
characterization; lycopene extraction methods
Observations on the Spinning Disc Micromixing Characteristics
EUGENIA TEODORA IACOB TUDOSE, “Gheorghe Asachi” Technical University of Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, Iași, Romania, et_tudose@yahoo.com
pages 23 - 32 Download
Abstract
The spinning disc technology is one of the most versatile
process intensification techniques used in different application fields. The
intense micromixing is one of the strong features the spinning disc is used
for. The current study includes experimental data related to the dispersion
number values, obtained at different working parameters, namely the feeding
liquid flow rate and the disc rotational speed. These were used to calculate
the characteristic SD micromixing times, found to decrease faster with the
disc rotational speed increase, especially at smaller flowrates. The shear
stress is increasing fast with the rotational speed and varies with the disc
radial position. Furthermore, the residence time has the smallest values at
the highest rotational speeds and liquid flowrates. Thus, despite the
increased micromixing obtained at large rotational speeds, the corresponding
shorter residence time can be a restricting factor, since the processed
liquid cannot take advantage of the enhanced turbulence.
Keywords:
diffusion coefficient; indented surface; micromixing time; residence time;
shear stress
Researches Regarding the Monitoring of Underground Water Quality in Vulnerable Communities to Nitrate Pollution from Agricultural Sources in Botoșani County, Romania
ALINA AGAFIȚEI, “Gheorghe Asachi” Technical University of Iași, Faculty
of Hydrotechnics, Geodesy and Environmental Engineering, Iași, Romania,
alinaagafitei@yahoo.com
VASILE LUCIAN PAVEL, “Gheorghe Asachi” Technical University of Iași, Faculty
of Hydrotechnics, Geodesy and Environmental Engineering, Iași, Romania
VALENTIN BOBOC, “Gheorghe Asachi” Technical University of Iași, Faculty of
Hydrotechnics, Geodesy and Environmental Engineering, Iași, Romania
pages 33 - 38 Download
Abstract
The object of the national water monitoring programs is the
evaluation and control of their quality. Monitoring data can be used to
establish initial conditions, final pollutant concentrations, but most of
the time they cannot be used to identify the stages and processes that occur
during pollution. In Botoşani County, a number of four communes were
diagnosed as vulnerable areas. This paper presents the results of the
groundwater quality monitoring in the period 2012 – 2019, in a number of 37
wells, located both in vulnerable areas, and in zones diagnosed as not being
vulnerable. The selected parameters for the monitoring are the indicators of
the nutrient regime: concentrations of nitrate, nitrite, phosphate, and
ammonium ions. By processing filed data, there is observed a decrease in the
nitrate ions concentration from two wells, during 2017 year. It was found
that in 2017 – 2019 there was a deterioration of its quality in terms of the
ammonium indicator, and in some localities both regarding nitrite and
nitrate parameters. Following the research carried out, we have proposed a
detailed action program for each area analyzed separately.
Keywords:
monitoring; nitrate; pollution; underground; water quality
Qualitative Assessment of Polyphenols Extracted from Fucus Spiralis Biomass Through High-Performance Thin-Layer Chromatography
CĂTĂLINA FILOTE, “Gheorghe Asachi” Technical University of Iaşi,
“Cristofor Simionescu” Faculty of Chemical Engineering and Environmental
Protection, Iaşi, Romania
OANA TEODORA CIUPERCĂ, “Gheorghe Asachi”
Technical University of Iaşi, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection, Iaşi, Romania, Research and
Processing Centre for Medicinal Plants PLANTAVOREL SA, Piatra Neamţ, Romania
IRINA VOLF, “Gheorghe Asachi” Technical University of Iaşi, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iaşi, Romania, iwolf@tuiasi.ro
pages 39 - 49 Download
Abstract
Marine macroalgae biomass is a valuable resource of bioactive
molecules and has received increased attention from the scientific community
with the goal to generate high-tech bioproducts. Polyphenols represent one
of these group of fine molecules that can be obtained from macroalgae.
Quantitative as well as qualitative extracts are of utmost importance for
the development of good macroalgal bioproducts. In this context, in order to
contribute to the current undergoing research, the present study focuses on
the assessment of polyphenols profile of extracts generated in an
ultrasounds-assisted extraction from Fucus spiralis brown macroalgae. The
qualitative analysis carried out through high-performance thin layer
chromatography (HPTLC) aims to point out the presence of polyphenolic
compounds from phenol-carboxylic acids to flavonoids and tannins.
Keywords: brown algae; polyphenols; ultrasounds-assisted extraction
extracts; thin layer chromatographyphy
Thiolated Chitosan for Biomedical Application
IOLANDA
FUSTEȘ-DĂMOC, “Gheorghe Asachi” Technical University of Iaşi, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iaşi, Romania
CĂTĂLINA ANIȘOARA PEPTU, “Gheorghe Asachi” Technical
University of Iaşi, “Cristofor Simionescu” Faculty of Chemical Engineering
and Environmental Protection, Iaşi, Romania,
catipeptu@tuiasi.ro
TEODOR
MĂLUȚAN, “Gheorghe Asachi” Technical University of Iaşi, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iaşi, Romania
pages 51 - 62 Download
Abstract
The chitosan is synthesized from
chitin by partially de-acetylation. The free amino groups are very important
in chitosan modifications. The biodegradability, non-toxicity,
bacteriostatic and biocompatibility proprieties represent the reasons why it
is promising in different applications. The functionalization with thiol
groups with different reagents improved its qualities. The Elman’s reagent
method, the Fourier Transform Infrared (FTIR) spectra, the Nuclear Magnetic
Resonance Spectroscopy (NMR), the X-ray diffraction (XRD) analysis and the
thermogravimetric analysis (TGA)have shown improvements of the
characteristics according to the reagents used. In vivo studies have
indicated the high degree of viability of cells tested with thiolated
chitosan or formulations based on thiolated chitosan. The modified chitosan
is used for nanoparticles, liposomes coating due the strong mucoadhesive
properties and in the compositions of hydrogels, matrix tablets, hydrogels
and nanoparticles for drug release over different mucous membranes in
various diseases, for antibacterial activity or for wastewater treatment
like as bio-sorbent for methyl orange.
Keywords: thiolated derivates;
biodegradability; mucoadhesive; biocompatibility; drug release
Evaluation of the Drying Process of Some Varnishes and Paints Applied on Fir Wood
ANDREEA MIHĂILĂ, “Gheorghe Asachi” Technical University of Iași, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iași, Romania, andreea.mihaila910@yahoo.com
CĂTĂLIN LISA, “Gheorghe Asachi”
Technical University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection, Iași, Romania
IOAN MĂMĂLIGĂ,
“Gheorghe Asachi” Technical University of Iași, “Cristofor Simionescu”
Faculty of Chemical Engineering and Environmental Protection, Iași, Romania
GABRIELA LISA, “Gheorghe Asachi” Technical University of Iași, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iași, Romania
pages 63 - 72 Download
Abstract
Given the growing interest shown by
the population in the restoration and redecoration of their dwelling spaces,
wood is a material that has been increasingly used both in exterior
constructions and for interior finishing works. The most important stage in
the obtaining of a coat of paint able to protect wood is the drying process,
which results in a coat of paint, called film, which strongly adheres to the
surface of the wood. In order to analyse the drying process and to determine
the effective diffusion coefficients, respectively, we applied three types
of alkyd paint available on the market: a Teflon protective varnish (SLT),
yacht varnish (LYP) and superglossy enamel (ESI) on dried fir-wood disks
which were 5 mm in diameter. The drying process and the formation of the
film itself were achieved using a Mettler Toledo TGA-SDTA851e device, under
constant temperature. The effective diffusion coefficient values obtained
ranged between 0.4·10-12 and 2.4·10-12 m2/s. The theoretical models achieved
show higher deviations in the case of the SLT samples. The cause of these
deviations may be the complex composition of the paint film but also the
fact a "skin effect" film is formed after drying at linear decreasing speed,
which prevents solvent diffusion.
Keywords: Paint; drying process;
effective diffusion coefficient; theoretical models; skin effect