Showing papers by "Spiros A. Pergantis published in 2013"
TL;DR: Trace element concentrations in sediment were investigated at four fish farms in the Eastern Mediterranean Sea and found that, in anoxic sediments, all elements had higher concentrations at the impacted stations than at reference stations while in oxic sediment, many elemental concentrations were lower at impacts than atreference stations.
113 citations
TL;DR: Farmed fish and wild fish aggregating in the vicinity of four Mediterranean fish farms with different environmental conditions were sampled and levels of metals (including As and Se) were measured in the muscle, liver, gills, bone and intestine.
63 citations
TL;DR: The content of total arsenic and arsenic compounds in the dominant seaweed species in the Thermaikos Gulf, Northern Aegean Sea was determined in samples collected in different seasons by acid digestion followed by ICP-MS and methylated arsenic species were measured at very low concentrations.
38 citations
TL;DR: In this paper, three different analytical techniques, namely NMR spectroscopy, mass spectrometry and dynamic light scattering, were used to unravel the structure and morphology of polyglycerol polyricinoleate (PGPR), which is used as an emulsifier in the preparation of chocolate and other confectionary products.
Abstract: Three different analytical techniques, namely NMR spectroscopy, mass spectrometry and dynamic light scattering, were used to unravel the structure and morphology of polyglycerol polyricinoleate (PGPR). This material is used as an emulsifier in the preparation of chocolate and other confectionary products. The use of 1D and 2D NMR techniques led to the distinction of two separate entities in commercial ricinoleic acid (RA) and PGPR samples, namely the monomeric and oligomeric RA (estolides). 1H and 13C spectra of PGPR confirmed the presence of polyglycerol moieties of various lengths being esterified by RA and estolides and to a lesser extent by oleic and linoleic acids. 13C-NMR DOSY experiments demonstrated the occurrence of several species in PGPR. Electrospray Ionization and tandem Mass Spectrometry succeeded in identifying the presence of over 30 glycerol/polyglycerol species containing n glycerol moieties with n = 1–6 esterified by monomeric and oligomeric RA molecules. Dynamic light scattering contributed to the characterization of PGPR morphology. The PGPR mixture contains relatively small-sized entities (monomers, dimmers, trimmers) and larger aggregates resulted from chain association. The percentage of larger aggregates is minimal compared to small-sized species.
24 citations
TL;DR: It has been demonstrated that V-EASI-MS offers some distinct advantages for the analysis of coordination compounds and redox active inorganic compounds over the predominantly used electrospray ionization (ESI) technique, and bipolar analysis of proteins was demonstrated for the first time.
19 citations