Evaluating the photocatalytic treatment of stevioside by TiO2 in different aqueous matrices and identification of transformation products
Articolo
Data di Pubblicazione:
2017
Abstract:
The present study reports the photocatalytic transformation of stevioside, under simulated solar irradiation using
TiO2 as a photocatalyst. As a tool of investigating the effect of various aqueous matrices, as well as, the initial
stevioside concentration on the variation of the photocatalytic efficiency, a fully nested experimental design
was employed. A significant impact on the degradation rate of the sweetenerwas observed: degradation rate decreases
in the order distilled water N river water N lake water, attributed to the increased natural organic matter
content of the respective natural water samples. Moreover, the investigation has involved the identification of intermediate
compounds, as well as the assessment of mineralization and toxicity evaluation.More than one hundred
unknown transformation products, most of themin the form of several isobaric species,were identified. By
employing accurate mass determination, we were able to attribute an empirical formula to each species and
throughMSn analyses we were capable to distinguish several isobaric species. The overall transformation mechanismwas
assessed and involved the hydroxylation/oxidation of themolecule and the subsequent loss of the glucose
units bound to the parent compound.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Photocatalysis
Stevioside
Sweeteners
Experimental design
Intermediates identification
Elenco autori:
Sakkas, V. A.; Sarro, M.; Kalaboka, M.; Santoro, V.; Albanis, T.; Calza, P.; Medana, C.
Link alla scheda completa:
Link al Full Text:
Pubblicato in: