Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Formulation and characterization of food-grade microemulsions as carriers of natural phenolic antioxidants
Δημιουργός/Συγγραφέας:	Chatzidaki M.D. Mitsou E. Yaghmur A. [EL] Ξενάκης, Αριστοτέλης[EN] Xenakis, Aristotelis [EL] Παπαδημητρίου, Βασιλική[EN] Papadimitriou, Vassiliki
Εκδότης:	Elsevier B.V.
Ημερομηνία:	2015
Γλώσσα:	Αγγλικά
ISSN:	0927-7757
DOI:	10.1016/j.colsurfa.2015.03.060
Περίληψη:	Food-grade W/O microemulsions based on lecithin, caprylic/capric triglycerides, isopropyl myristate, alcohols and water were formulated and structurally characterized to be used as potential carriers of natural food antioxidants. Different well-known food antioxidants including gallic acid, p-hydroxybenzoic acid, protocatechuic acid and tyrosol were successfully encapsulated in the aqueous cores of the microemulsions. A pseudo-ternary phase diagram was constructed to determine the extent of the monophasic area that corresponds to an inverted type microemulsion. Apparent hydrodynamic diameter measurements of empty and loaded microemulsions were performed using dynamic light scattering (DLS) and swollen micelles with diameters smaller than 10. nm were detected. Interfacial properties of the microemulsions were studied by electron paramagnetic resonance (EPR) spectroscopy employing the nitroxide spin probe 5-doxylstearic acid (5-DSA). A small increase in spin probe mobility upon addition of the antioxidants was observed; whereas the rigidity of the surfactants was not affected. Cryogenic transmission electron microscopy (Cryo-TEM) indicated the existence of entangled thread-like reversed micelles. Finally, the investigated phenolics were assessed and compared for their radical scavenging activity using an EPR approach based on free radicals. The encapsulated gallic acid showed the highest antioxidant activity (0.93. mM trolox equivalents) as compared to other antioxidants assessed within the frame of this study.
Τίτλος πηγής δημοσίευσης:	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Τόμος/Κεφάλαιο:	483
Σελίδες:	130-136
Θεματική Κατηγορία:	[EL] Χημεία (Γενικά)[EN] Chemistry (General)
Λέξεις-Κλειδιά:	Antioxidant Cryo-TEM DLS EPR Gallic acid W/O microemulsion
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2015 Elsevier B.V.
Σημειώσεις:	European Cooperation in Science and Technology, COST: CM1101. Financial support by National Strategic Reference Framework , Action “Developmental Projects of Research Organisations-Kripis” and an STSM grant of the COST CM1101 action.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Χημικής Βιολογίας - Επιστημονικό έργο