Title of article :
Size characterization by Sedimentation Field Flow Fractionation of silica particles used as food additives Original Research Article
Author/Authors :
Catia Contado، نويسنده , , Laura Ravani، نويسنده , , Martina Passarella، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
10
From page :
183
To page :
192
Abstract :
Four types of SiO2, available on the market as additives in food and personal care products, were size characterized using Sedimentation Field Flow Fractionation (SdFFF), SEM, TEM and Photon Correlation Spectroscopy (PCS). The synergic use of the different analytical techniques made it possible, for some samples, to confirm the presence of primary nanoparticles (10 nm) organized in clusters or aggregates of different dimension and, for others, to discover that the available information is incomplete, particularly that regarding the presence of small particles. A protocol to extract the silica particles from a simple food matrix was set up, enriching (0.25%, w w−1) a nearly silica-free instant barley coffee powder with a known SiO2 sample. The SdFFF technique, in conjunction with SEM observations, made it possible to identify the added SiO2 particles and verify the new particle size distribution. The SiO2 content of different powdered foodstuffs was determined by graphite furnace atomic absorption spectroscopy (GFAAS); the concentrations ranged between 0.006 and 0.35% (w w−1). The protocol to isolate the silica particles was so applied to the most SiO2-rich commercial products and the derived suspensions were separated by SdFFF; SEM and TEM observations supported the size analyses while GFAAS determinations on collected fractions permitted element identification.
Keywords :
Silica nanoparticles , Food additives , E551 , Size analysis , Sedimentation Field Flow Fractionation
Journal title :
Analytica Chimica Acta
Serial Year :
2013
Journal title :
Analytica Chimica Acta
Record number :
1029578
Link To Document :
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