Browsing by Person "Sampaio, Shirley L."

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Anthocyanin-rich extracts from purple and red potatoes as natural colourants: Bioactive properties, application in a soft drink formulation and sensory analysis
(Elsevier, 2020-11-03) Sampaio, Shirley L.; Lonchamp, Julien; Dias, Maria Inês; Liddle, Catriona; Petropoulos, Spyridon A.; Glamočlija, Jasmina; Alexopoulos, Alexios; Santos-Buelga, Celestino; Ferreira, Isabel C. F. R.; Barros, Lillian
Aqueous extracts from seven coloured potato varieties (three red-fleshed, three-purple fleshed, and one marble-fleshed genotype) were studied for their anthocyanin content, in vitro biological activities, colouring properties and their potential application in the food industry. Acylated glycosides or pelargonidin and petunidin aglycones were identified as the main anthocyanin forms in the red and purple varieties, respectively. The total anthocyanin content among varieties ranged from 478.3 to 886.2 mg/100 g extract. All the extracts presented in vitro antioxidant, antibacterial and antifungal activities, whereas no toxic effects were detected. Finally, two selected extracts were tested as colourants in a soft drink formulation and presented suitable sensory profiles as well as high colour stability during a 30-day shelf-life when compared with the commercial colourant E163. Therefore, the tested extracts could be used as natural food colourants and considered for substituting the existing synthetic colouring agents.
Novel palm shortening substitute using a combination of rapeseed oil, linseed meal and beta-glucan
(Elsevier, 2024-06-19) Sampaio, Shirley L.; Chisnall, Timothy; Euston, Stephen R.; Liddle, Catriona; Lonchamp, Julien
This study investigated the potential of a novel sustainable ingredient composed of rapeseed oil, linseed meal and beta-glucan (PALM-ALT) to mimic palm shortening functionality in cake. The combined functional properties of linseed meal and beta-glucan led to stable semi-solid emulsion-gels (20–31 μm oil droplet size, 105–115 Pa.s viscosity and 60–65 Pa yield stress). PALM-ALT contained 25 and 88% less total and saturated fat than palm shortening, whilst PALM-ALT cakes contained 26 and 75% less total and saturated fat than the palm-based control. PALM-ALT cakes matched the flavour profile of the palm-based control, while rapeseed oil cakes tasted more sour and less sweet than the control (p < 0.05). PALM-ALT cakes proved less hard and more cohesive than the control (p < 0.05), with 100% of the consumer panel preferring PALM-ALT formulations. This study demonstrated the unique potential of PALM-ALT as healthier, sustainable and competitive alternative to palm shortening.