Effects of Anti-browning Combinations of Ascorbic Acid, Citric Acid, Nitrogen and Carbon Dioxide on the Quality of Banana Smoothies
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The effects of 0.2 % ascorbic acid + 0.2 % citric acid (AA + CA), 0.2 % ascorbic acid + 0.2 % citric acid + N2 (AA + CA + N2) and 0.2 % ascorbic acid + 0.2 % citric acid + CO2 (AA + CA + CO2) on the quality of banana smoothies were investigated. An obvious anti-browning effect was observed after each treatment, which resulted from a significant decrease in the polyphenol oxidase activity (p < 0.05) and the exclusion of oxygen by infusion with inert N2 or CO2. The AA + CA + N2 treatment exhibited the lowest change of browning index (ΔBI) indicating the best anti-browning effect on the banana smoothies. Compared with the Herschel–Bulkley model, the Power Law was less complex and more suitable for describing the rheological properties of the banana smoothies. AA + CA, AA + CA + N2 and AA + CA + CO2 treatments all significantly increased the pectin methylesterase activity of the banana smoothies (p < 0.05). The AA + CA treatment increased the cumulative volume of the larger particles in the banana smoothies. The viscosity of the banana smoothies decreased after the three different treatments. In terms of the comprehensive results, the inclusion of AA + CA + N2 in the production of banana smoothies was the best processing method applied.
KeywordsBanana smoothies Anti-browning Rheological properties Sensory attributes
Particle size distribution
Residual sum of squares
Total soluble solids
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