期刊
FOOD CHEMISTRY
卷 133, 期 2, 页码 423-429出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2012.01.054
关键词
Quercetin; Zein colloidal particles; Electrosteric stabilisation; Anti-oxidant activity
资金
- Marie Curie International Incoming Fellowship (within the 7th European Community Framework Programme)
Quercetin loaded biopolymeric colloidal particles were prepared by precipitating quercetin (water insoluble polyphenol) and zein (hydrophobic protein), simultaneously, by adding their hydro-alcoholic solution to aqueous solution in presence of sodium caseinate as an electrosteric stabiliser. The presence of protein resulted in altering the shape of quercetin precipitates from needle-like to spherical shape at higher zein proportions, as confirmed by transmission electron microscopy. The average particle size of zein:quercetin composite particles was below 200 nm (130-161 nm) with negative surface charge (-30 to -41 mV), as confirmed by dynamic light scattering and electrophoretic mobility data. Solid state characterisation (X-ray diffraction) and spectroscopic measurements (UV-Vis and IR spectroscopy) confirmed characteristic changes in quercetin due to the entrapment in the biopolymeric matrix of colloidal particles. Results from anti-oxidant study demonstrated the advantage of entrapping quercetin in the colloidal particles in terms of the chemical stability in the alkaline pH and against photodegradation under UV-light irradiation. (C) 2012 Elsevier Ltd. All rights reserved.
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