The aim of the study was to analyse the effect of osmotic treatment assisted by ultrasound on the physico-chemical properties of blueberries from Suceava county, Romania. Ultrasound treatment was conducted at the frequency of 25 kHz (using different values of amplitude - 20, 60 and 100%, respectively) in 61.5% sucrose solution at 30, 40 and 50 °C for 20, 40 and 60 min. The Box-Behnken design was used to investigate the influence of independent variables (time, temperature and amplitude) on the osmotic dehydration. The results showed that for physico-chemical characteristics (mass transfer parameters; moisture content; total content of anthocyanins, flavonoids and polyphenols; DPPH assay scavenging activity) that optimal conditions were obtained at 30 °C for 40 min at a 100% amplitude. Ultrasound treatment stimulated changes in the main characteristics, especially of colour leading to a higher lightness (L*), decreasing AsA-POD and water activity. The results indicated that the higher the values of independent variables are, the more representative is the correlation between them.

中文翻译：

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超声辅助渗透处理对蓝莓理化特性的影响（Vaccinium myrtillus L.）

本研究的目的是分析超声辅助渗透处理对罗马尼亚苏恰瓦县蓝莓理化性质的影响。在 61.5% 蔗糖溶液中，在 30、40 和 50°C 下以 25 kHz 的频率（分别使用不同的振幅值 - 20、60 和 100%）进行超声处理 20、40 和 60 分钟。Box-Behnken 设计用于研究自变量（时间、温度和幅度）对渗透脱水的影响。结果表明，对于理化特性（传质参数；水分含量；花青素、黄酮类和多酚的总含量；DPPH 测定清除活性），最佳条件是在 30°C 下以 100% 幅度保持 40 分钟。超声处理刺激了主要特征的变化，尤其是颜色的变化，导致更高的亮度 (L*)，降低了 AsA-POD 和水分活度。结果表明，自变量的值越高，它们之间的相关性越具有代表性。