Homogeneous Grafting of New Amido Groups onto Hydroxyethyl Cellulose Acetate Microfibrils: Solubility Study

Attempts to modify the surface of hydroxyethyl cellulose acetate (HECA-DSAC ~1.5) microfibrils were made using amine terminated molecules. First, the amine compounds were reacted with sebacoyl chloride in nonstoichiometry ratio in order to obtain a monoadduct chloride such as ClCO-(CH2)8-CONHR. Then the resulted derivatives were coupled with hydrophobic hydroxyethyl cellulose acetate (HECA) by a condensation reaction in homogenous medium using triethyl amine (N(C2H5)3) in THF. The products were characterized by FTIR, 1H NMR, 13C NMR, and DRX, and thermal proprieties were also determined. The X-ray diffraction showed that the crystallinity of the amido esters obtained depends on both the degree of substitution and the nature of the graft moiety. The solubility study was based on the determination of the Flory–Huggins interaction parameters (χ) using the partial Hansen solubility parameters (HSP) and that were calculated from the Van Krevlen–Hoftyze (VKH) method and the T. Lindvig approximation. Keywords: cellulose; microfibrils; amidation; Hansen solubility; Flory–Huggins parameters

The inhibitive action of Pistacia lentiscus as a potential green corrosion inhibitor for mild steel in acidic medium

The aim of present work is to test the effect of the extract (PLE) and the essential oil (PLO) of Pistacia lentiscus as a potential green corrosion inhibitors for acidic media using weight loss measurements and electrochemical techniques (potentiodynamic polarization curves, and electrochemical impedance spectroscopy) in the presence of different concentrations of PLE & PLO ranging from 0.25 to 2 g/L. The inhibition efficiency was found to increase with increasing inhibitor concentration up to maximum 81.2 % and 92.1 % for PLO and PLE at 2g/L, respectively. Potentiodynamic polarization showed that PLE and PLO act as mixed type inhibitors. Nyquist plots show that the efficiency of inhibition increases with increasing concentration of PL and the increased charge transfer resistance. Adsorption of PLO and PLE on the steel surface followed a Langmuir’s isotherm and the thermodynamic parameters were determined and discussed.

Chemical composition of essential oil and antioxidant and anti-corrosion activity of extract and essential oil of Pennyroyal Mint (Mentha pulegium, MP)

View the growing success of natural products as an alternative to synthetic chemicals. The purpose of this study was to contribute to the valorization of leaves of Mentha pulegium by determining the chemical composition of its essential oil and evaluate in vitro the antioxidant and the anticorrosive activities of its aqueous extract and essential oil. The essential oil revealed 1,8-Cineole (31.9%) followed by piperitone (15.6%), Limonene (14.6%) and β-Pinene (4.8%) as the main constituents. The antioxidant activity of aqueous extract was evaluated by the method of DPPH radical scavenging. The extract and the essential oil of M. pulegium were tested as corrosion inhibitors of mild steel in 0.5 M H2SO4 using weight loss measurements and electrochemical methods. The aqueous extract exhibited a moderate antioxidant activity compared to acid ascorbic and the IC50 value was 36,62 µg/mL. The obtained  results  have showed that the inhibition efficiency increases with increasing  inhibitor  concentration  to  attain  90.3 % at  2 g/L of  MPE and 87.3 %  at 4g.L-1 of MPO at 303 K. Finally, extracts and essential oil of M. pulegium from Mediterranean origin have numerous potential as a substitute to chemical additives for the food industry

Design, Characterization and Investigation of Heavy Metal Ions Removal by New Cellulose-Ether Based adsorbent

The present investigation deals with the elaboration in homogenous conditions of new cross-linked, hydroxyl cellulose (HEC) based material. Further, its application as a new eco-friendly low-cost efficient adsorbent of hazardous metal ions from an aquatic environment is treated. In this respect, the functionalization of HEC has been carried out using EDTA as a cross-linking agent exploiting its high capacity to chelate heavy metal ions in aqueous solutions. The proposed structure of the new crosslinked material (HECD) was investigated using structural analyses (FTIR-ATR vibrational spectroscopy and CP/MAS 13C NMR Spectroscopy). Also, the thermal and crystalline behaviours of unmodified and modified HEC were studied using thermogravimetric (TG and DTG) and DRX patterns. In addition, SEM images were recorded to demonstrate the changes expected at the morphological and textural level. Furthermore, the adsorption capacity of Pb (II), Cu (II), Cd (II) and Zn (II) ions from aqueous solutions by HECD was investigated using batch technique and optimized according to metal concentration, pH, contact time, ionic selectivity and regenerability. The maximum metal uptakes under optimum conditions were of 1.96, 4.18, 1.81 and 1.66 mmol/g for Pb (II), Cu (II), Cd (II) and Zn (II), respectively. Thus, to examine the mechanism of adsorption, the experimental data is fitted to kinetic, isothermal, and thermodynamic modelling

Etude de la composition chimique de l'huile essentielle du lentisque de la région orientale du Maroc

Le lentisque ou pistachier appartient à la famille des Anacardiacées. C'est un arbuste poussant dans les sites arides de la région méditerranéenne (Asie, Europe, Afrique). On l'appelle aussi arbre à mastic car sa sève est utilisée pour la réalisation d'une gomme à odeur prononcée. Son huile essentielle est obtenue par hydrodistillation et analysée par chromatographie en phase gazeuse. L'objectif ce ce travail est l'étude de la composition chimique de l'huile essentielle du lentisque récolté de différentes zones de la région orientale du Maroc

Seasonal variation in the essential oil composition of Artemisia herba alba, Growing in Eastern Morocco

The seasonal and even the number of hours that enable plants to be exposed to sunlight, may influence the phytochemistry of the plant since some compounds may be accumulated at a particular period to respond to environmental changes. Objectifs The seasonal variation of the essential oil extracted from the aerial parts of Artemisia herba alba growing in eastern Morocco (Taforalt) has been studied

Effet de la puissance micro-ondes sur la composition chimique de l'huile essentielle de l'Eucalyptus globulus

Dans le but de mettre au point les conditions optimales d’extraction des huiles essentielles sous micro-ondes, nous avons effectué une série de travaux en contrôlant l’effet de plusieurs facteurs sur la composition chimique des extraits : présence du solvant, quantité de solvant et puissance des micro-ondes. Dans le cas de l’Eucalyptus globulus récolté à Oujda, nous avons comparé la composition chimique de l’huile essentielle extraite par micro-ondes sous deux puissances différentes : 280W et 700W. 38 composés volatils ont été identifiés par GC/MS et GC/FID. La comparaison de la composition chimique, dans les deux cas de puissance d’extraction (280W et 700W), nous a permis de noter respectivement les résultats suivants : a-pinène (2,41%, 4,06%) ; transpinocarveol (2,94%, 3,28%) ; 1,8-cinéole (0,91%, 1,84%) ; (+)-aromadendrene (2,22%, 2,82) ; globulol (4,63%, 4%) ; g-eudesmol (4,66%, 4,2%) ; b-eudesmol (17,02%, 14,5%) ; 1,2,3,4-tetrahydro-2,3-methano-2,8-dimethoxynaphtalene (4,27%, 4,28%) ; anisole, p(m-chlorophenyl) (0 %, 0,24%). La puissance micro-ondes choisie a un effet direct sur la variation de la composition chimique de l’huile essentielle extraite par micro-ondes de point de vue quantitatif et qualitatif

Antioxidant and cytotoxicity activity of essential oil grown Lavandula dentata

The present study describes the phytochemical profile Antioxidant and cytotoxicity activity of Lavandula dentata essential oil, collected in eastern Morocco (Taforalt). The sample of essential oil was obtained from the aerial parts of the plant by hydrodistillation and analyzed by GC–MS. The in vitro cytotoxicity of the oil on the cancer cell lines PC-3 (prostate), V79 (fibroblaste) and normal P388D1 (murine macrophage) was examined. We have shown that the oil had negligible cytotoxic effects against all cell lines tested. The oil was also found to possess antioxidant activity as demonstrated by the 1,1-diphenyl-2- picrylhydrazyl (DPPH) radical method. Lavandula dentata essential oil has promising potentials for incorporation into various food, cosmetic and pharmaceutical products for which a natural aroma, colour, antioxidant and antimicrobial additive is desired

Chemical composition of the essential oil of thyme ( Thymus vulgaris) from Eastern Morocco

ABSTRACT The essential oil from flowering Thyme (Thymis vulgaris L.) an aromatic member of the Lamiaceae family, from Morocco, obtained by hydrodistillation, was analysed by GC/FID and GC/MS. The constituents were identified by their mass spectra and Kovats' indices. Forty three compounds consisting 97.85% of the total components were identified from the oil obtained with 1% yield. Among those, camphor (38.54%), camphene (17.19%), α-pinene (9.35%), 1, 8-cineole (5.44%), borneol (4.91%) and β-pinene (3.90%) were the major oil components. Essential oil of Thyme was evaluated for its antibacterial activities against six Gram-positive and Gram negative pathogenic bacteria: Staphylococcus aureus, S. epidermidis, Streptococcus sp., Pantoa sp. and Escherichia coli

Chemical Composition, Cytotoxic and Antioxydant Activity of The Essential Oil of Lavandula dentata

peer reviewedThe composiiton of the essential oil from aerial part and flowers of lavandula dentate, collected in eastern Morocco (Taforalt, Talazart), were analysed by GC/FID and GC-MS