Day :
- Euro Chemistry
Session Introduction
Amira A. Alfadil,
Sultan Qaboos University,
Title: Anthracen and phenanthren inclusion complexes with 2-Hydroxypropyle-β/γcyclodextrin: Experimental and moleculardynamic studies
Biography:
Department of Chemistry, College of Science, Sultan Qaboos University, Box 36, Al-Khoud 123, Oman.
Abstract:
The supramolecular interaction of anthracene (ANT) and phenanthrene (PHN) with 2- Hydroxypropyle-β/γ-cyclodextrin (2-HP-β/γ-CD) has been investigated in aqueous media for the first time. The stability of these complexes and the mode of inclusion in aqueous media at atomistic levels were monitored by molecular dynamic (MD) simulations. The inclusion complexes were investigated and characterized by fluorescence spectroscopy, and 1HNMR. The results obtained from the experimental and MD studies have demonstrated the formation of stable 1:1 complexes between the two guests and two hosts in aqueous media. From the fluorescence study, the binding constants of ANT with HP-β -CD, and HP- γ-CD were found to be 5.02 ± 0.46 ×102 and 2.89 ±0.44 ×102 M-1 , respectively. Whereas, PHN-HP-β/γ -CD formation constants are 0.85 ± 0.12 ×102 and 0.49 ±0. 29 ×102 M-1 for HP-β -CD and HP- γ-CD respectively. 1HNMR results approved the complex formation, notable changes to the aromatic protons chemical shifts were observed upon the addition of hosts to the two guests compared to the free guest. The results obtained show that the size of the cavity of the macrocycle, the number of hydroxypropyl substituents, and the polarity of the rim play an important role in the stability of the formed complex. The hydrophobic effect is the main driving force for the stability of these complexes in aqueous media.
Dexter Roquero,
University of Southern Mindanao,Philippines
Title: Quantitative assessment of total Mercury concentration in the different edible parts of yellowfin tuna (Thunnus albacares) in general santos city fish port complex
Biography:
Roquero, D.D.& Dapun, M.V.T Department of Chemistry, College of Arts and Sciences, University of Southern Mindanao
Abstract:
Economic activities are generally exploitative and harmful to the environment, posing a threat to all living organisms. Some species' extinctions have been linked to industrialization, specifically the pollutants emitted by factories into the terrestrial, aquatic, and atmospheric environments. Because marine waters are contiguous and constantly moving due to tidal fluctuations, contaminated effluents eventually reach estuaries and coastal waters and are dispersed in seas and oceans. The proximate compositions of the different edible parts of yellowfin tuna (Thunnus albacares) back, belly, and tail meat were assessed in order to relate the trend to the total mercury concentration, which was determined using Cold Vapor Atomic Absorption Spectroscopy (CV-AAS). The mean percentages of yellowfin tuna proximate composition in different edible parts (back, belly, and tail meat) range from 70.77 to 73.21% moisture, 4.75 to 5.19% ash, 1.43 to 3.04% crude fat, and 20.00 to 22.60% crude fat (crude protein). Total mercury concentration was 0.04ppm in the back meat and 0.03ppm in the belly and tail meat. The tail and belly meats had the highest percentages of moisture and crude fat. Furthermore, the back meat had the highest crude protein and ash content. The proximate composition of the fish is consistent with the findings of published articles, and the total mercury concentrations in the various edible parts are within the allowable threshold limit set by various regulatory agencies.