Molecules, Vol. 26, Pages 5260: Shelf-Life Stability of Ready-to-Use Green Rooibos Iced Tea Powder —Assessment of Physical, Chemical, and Sensory Properties
Molecules, Vol. 26, Pages 5260: Shelf-Life Stability of Ready-to-Use Green Rooibos Iced Tea Powder—Assessment of Physical, Chemical, and Sensory Properties
Molecules doi: 10.3390/molecules26175260
Authors:
Chantelle Human
Dalene de Beer
Magdalena Muller
Marieta van der Rijst
Marique Aucamp
Andreas Tredoux
André de Villiers
Elizabeth Joubert
Green rooibos extract (GRE), shown to improve hyperglycemia and HDL/LDL blood cholesterol, has potential as a nutraceutical beverage ingredient. The main bioactive compound of the extract is aspalathin, a C-glucosyl dihydrochalcone. The study aimed to determine the effect of common iced tea ingredients (citric acid, ascorbic acid, and xylitol) on the stability of GRE, microencapsulated with inulin for production of a powdered beverage. The stability of the powder mixtures stored in semi-permeable (5 months) and impermeable (12 months) single-serve packaging at 30 °C and 40 °C/65% relative humidity was assessed. More pronounced clumping and darkening of the powders, in combination with higher first order reaction rate constants for dihydrochalcone degradation, indicated the negative effect of higher storage temperature and an increase in moisture content when stored in the semi-permeable packaging. These changes were further increased by the addition of crystalline ingredients, especially citric acid monohydrate. The sensory profile of the powders (reconstituted to beverage strength iced tea solutions) changed wit...
Source: Molecules - Category: Chemistry Authors: Chantelle Human Dalene de Beer Magdalena Muller Marieta van der Rijst Marique Aucamp Andreas Tredoux Andr é de Villiers Elizabeth Joubert Tags: Article Source Type: research