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    Application of butterfly pea flower extract in processing some Vietnamese traditional foods
    (2022-09-01)
    Thuy, Nguyen Minh
    ;
    Ben, Tran Chi
    ;
    Ngoc, Pham Thi Be
    ;
    Tai, Ngo Van
    Butterfly pea flower (BPF) extract was applied to the processing of traditional Vietnamese food products to bring attractiveness and safety. Different cooking techniques as steaming, boiling, frying, baking, and sterilization were used and controlled. All products were analyzed for total anthocyanin content remaining after processing conditions. The selected percentage of extract and treatment time (minutes) in different processing methods were obtained: Bloating fern-shaped cake/thin cakes (bánh bèo) (10% extract – steaming time 7 min); Rice ball sweet soup – chè ỉ) (15% extract – boiling time 6 min), fried Meat stuffed rice ball – viên thịt) (10% extract (v/w) – frying time 4 min), and bread (15% extract – baking temperature 160°C). Half-life values of anthocyanin degradation at different temperatures (through cooking methods) were observed. A case study was performed with BPF drink, this product had high quality when adding 5% BPF extract (v/v), sterilized at 125°C for 3 min with extended storage time (more than 4 months). The degradation of anthocyanin during storage was modeled according to the first-order kinetics. The half-life values were calculated as 38 and 46 weeks, respectively, at ambient (28 ± 2°C) and low temperature (6 ± 2°C) storage.
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    Effect of different cooking conditions on resistant starch and estimated glycemic index of macaroni
    (2022-09-01)
    Thuy, Nguyen Minh
    ;
    Van Tai, Ngo
    Resistant starch is a type of carbohydrate that is slowly digested in the small intestine and fermented in the large intestine. Studies have been conducted to investigate the effects of different cooking methods (boiling, steaming, microwave, stir-frying, and deep frying), cooling and freezing on the quality of macaroni prepared with wheat flour and other resistant combinations starch sources. In this study, the in vitro digestibility of macaroni was determined and the glycemic index was estimated. Research results showed that cooking methods (boiling, steaming, microwave, stir-frying, and deep frying) reduced the resistant starch content of macaroni from 3.37 to 66.66%; however, cooling and freezing significantly increased the resistant starch content of macaroni from 6.88 to 24.19% and 9.85 to 37.28%, respectively. Macaroni prepared with the addition of flour/starch containing high levels of resistant starch exhibited a significantly lower estimated glycemic index (44.53–47.10) than the control sample using100% wheat flour (49.31).