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| ROCHA,FÁBIO R.P.; BATISTA,ALEX D.; MELCHERT,WANESSA R.; ZAGATTO,ELIAS A.G.. |
| ABSTRACT Coupling solid-phase extraction (SPE) to flow systems has promoted a synergistic development. Whereas SPE mechanization leads to improved precision and higher sample throughput, as well as diminishes systematic errors and contamination risks, analyte concentration and separation from the sample matrix provides a remarkable impact on detectability and selectivity in flow analysis. Historical aspects, main cornerstones, tips for system design, and recent applications are critically reviewed, in the context of analyte(s) separation/concentration, sample clean-up, and release of sorbed chemical species involving both packed (e.g. mini-columns, cartridges, and disks) or fluidized (e.g. beads and magnetic materials) particles. Novel (bio)sorbents,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beads; Flow analysis; In-line analyte concentration; In-line sample treatment; Sample clean-up; Solid-phase extraction. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200803 |
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| Wissam,Zam; Samer,Housheh. |
| The objective of the current study was to encapsulate flaxseed oil extracted from finely grounded flaxseed powder and determined for its fatty acids content by GC/FID. Ionotropic gelation method was used to form beads containing 40% flaxseed oil with vitamin E being used as an antioxidant agent. The study employed calcium chloride solution as crosslinking agent with a combination of sodium alginate and salep. The effect of polymer concentrations and calcium chloride concentration on the morphology, entrapment efficiency and oil release was studied. The encapsulation efficiency reached 93.46 ± 0.064% using 0.6% of salep and 2% sodium alginate with 0.3M calcium chloride gelling solution. In SGF medium, the matrix released only about 28.56% of the entrapped... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flaxseed oil; Sodium alginate; Salep; Beads. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100578 |
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