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M a y 0 9 - 1 0 , 2 0 1 9
S t o c k h o l m , S w e d e n
Page 31 Journal of Organic & Inorganic Chemistry
ISSN: 2472-1123 Advanced Chemistry 2019
2nd European Congress on
Advanced Chemistry
Some quaternary ammonium from amino-alcohols and n-bromoalkanes, referred to as C 14EtOH, C14PrOH and C14iPrOH, (where EtOH
= ethanol, PrOH = propanol, iPrOH = iso-propanol) have been synthetized. Their structures were checked by the usual spectroscopic
methods (1H, 13C NMR and IR and RX) and their physicochemical properties in aqueous solution have been studied by surface tension
and conductivity measurements. The assessment of their antibacterial activity in water was made against three bacterial strains
Escherichia coli (E coli), Staphylococcus aureus (S aureus), and Pseudomonas aeruginosa ( P aerug). The values of inhibition zone (IZ),
Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) were evaluated in terms of two structural
factors such as the lengthening of the hydrophobic chain carbon atoms and the location of OH alcoholic function with respect to
quaternary ammonium, N+. The location OH group shows its influence on the availability of N+ which is responsible for the electrostatic
interactions with bacterial cell walls. The theoretical binding mode of the target molecules was evaluated by docking studies against
the enzyme Dehydrosqualene synthase (CrtM) (PDB = 3ACX). The DFT method was made to understand the effect of the degree of
molecular electrophilicity in the inhibition process of three types of cationic surfactants against two bacterial strains Gram-negative
types Escherichia coli (E coli) and Pseudomonas aeruginosa (Pseudo). The membrane surface of Gram-positive bacteria is generally
negatively charged due to the presence of lipopolysaccharide group, therefore a number of descriptors were calculated by of B3LYP/6
-31 G (d) method for the three inhibitors in their monomer state (below CMC(critical micellar concentration) in the aqueous medium, the
examination of these descriptors reveals that the C14EtOH molecules is the best inhibitor which has an ability to accept an electron from
the bacterial walls negatively charged following the C14 IPrOH and C14 PrOH.
Antibacterial activity evaluation of cationic
surfactants in the series of (N-(n-hydroxyalkyl)-N,
N- dimethyl n-alkyl ammonium bromide): a
theoretical approach by the docking study
Zakaria Hafidi1 , Mohammed El Achouri1, Lamia Yakkou2, Fatima
Ezzahra guouguaou1 , Souad Amghar2 and S Amghar
1Mohammed V University Laboratoire de physico-chimie des matériaux inorganiques et
organiques, Centre des Sciences des Matériaux, Ecole Normale supérieure-Rabat, Morocco
2Lumbricidae, Improving Soil Productivity and Environment (LAPSE). Centre Eau, Ressources
Naturelles, Environnement et Développement Durable (CERN2D). Ecole Normale Supérieure-
University Mohamed V in Rabat
Biography
Zakaria Hafidi has completed his Bachelor’s from Ibn Zohr University of Agadir and MSc fromMohammed V University of Rabat. He is currently pursuing his Doctorate in Organic
Chemistry: synthesis of new quaternary ammonium surfactants and their potential use.
Zakaria Hafidi et al., J Org Inorg Chem 2019, Volume:5
DOI: 10.21767/2472-1123-C2-023