Molecular encapsulation of ascorbyl palmitate in preformed V-type starch and amylose

•Preparation of inclusion complexes by “inserting” guest molecules into preformed “empty” V-type amylose helices.•Use of ascorbyl palmitate as a model guest compound.•Effect of solvent environment, complexation temperature, annealing and guest concentration on inclusion complex formation.•Complexati...

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Veröffentlicht in:Carbohydrate polymers 2014-10, Vol.111, p.256-263
Hauptverfasser: Kong, Lingyan, Ziegler, Gregory R.
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Sprache:eng
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Zusammenfassung:•Preparation of inclusion complexes by “inserting” guest molecules into preformed “empty” V-type amylose helices.•Use of ascorbyl palmitate as a model guest compound.•Effect of solvent environment, complexation temperature, annealing and guest concentration on inclusion complex formation.•Complexation taking place in intermediate solvent concentrations at room temperature.•Annealing resulting in up to 65% crystallinity, which facilitated complexation. In the present study, we introduce a simple method to prepare inclusion complexes by “inserting” guest molecules into preformed “empty” V-type amylose helices. Ascorbyl palmitate (AscP) was used as a model guest material to investigate the effect of solvent environment, complexation temperature, annealing and guest concentration on inclusion complex formation. High complexation temperature was not necessary for encapsulating guest molecules in amylose helices, avoiding thermal degradation of guest compounds. This method would also avoid the wasting of guest materials because uncomplexed guest can be reused. It was found in the study that intermediate ethanol and acetone concentrations (generally 40–60%, v/v) at room temperature were appropriate for the complexation between V-amylose and AscP. Annealing, i.e. heat treatment in ethanol solutions at elevated temperatures (45–70°C), was able to significantly increase the crystallinity of V-amylose and V-starch to as high as 65% and facilitate greater complexation evidenced from higher enthalpies, probably due to more regularly arranged helical cavities in larger crystalline phase. The complexation between V-amylose and AscP was also found to be enhanced with AscP concentration, while the dissociation temperature experienced a slight decrease.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2014.04.033