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Abstract：
Aҫai fruit is characterized by the properties of its bioactive compounds; however, this fruit is highly perishable and its compounds are sensitive when exposed to non-optimal environmental factors. Therefore, the objective of this study was to encapsulate the fruit pulp by spray drying to improve the nutritional value and extend the shelf life of the products derived from acai fruit. Maltodextrin was used as a wall material and the process was optimized to obtain the desirable values of the response variables. For this, a central compound design (CCD) was developed to determine the influence of temperature (110-170 °C) and the wall material proportion (5-15 %) on dependent variables: the retention of ascorbic acid, moisture percentage, hygroscopicity, solubility, water activity, and yield. Furthermore, the effects of spray drying on bioactive compounds (AA, TPC, TFC, TA, TCC, GA, CT, and QC) and antioxidant activity (ABTS, DPPH, and ORAC) were evaluated. The maximum design temperature (170 °C) and wall material proportion (15 %) significantly influenced the response variables where encapsulation was applied, with high ascorbic acid retention (96.886 %), low moisture (0.303 %), low hygroscopicity (7.279 g/100 g), low level of water activity (0.255), a water solubility index of 23.206 %, and a high yield of 70.285 %. The bioactive compounds analyzed and the antioxidant capacity presented significant retention values for AA (96.86 %), TPC (65.13 %), TFC (82.09 %), TA (62.46 %), TCC (7.28 %), GA (35.02 %), CT (49.03 %), QC (37.57 %), ABTS (81.24 %), DPPH (75.11 %), and ORAC (15.68 %). Therefore, it is concluded that the powder obtained under these conditions has desirable physical properties, and the drying process preserved a notable retention of bioactive compounds and their antioxidant activities.
摘要：
Aai水果的特点是其生物活性化合物的特性;然而，这种水果是高度易腐的，当暴露于非最佳环境因素时，它的化合物是敏感的。因此,这项研究的目的是通过喷雾干燥封装果肉，以提高营养价值，延长产品的保质期从acai水果。使用麦芽糊精作为壁材料,并优化该方法以获得响应变量的期望值。为此，开发了中心复合设计（CCD）来确定温度（110-170°C）和壁材料比例（5-15％）对因变量的影响：抗坏血酸的保留，水分百分比，吸湿性,溶解度，水活动,和产量。此外，喷雾干燥对生物活性化合物(AA，TPC,TFC,TA,TCC,GA,CT,和QC）和抗氧化活性（ABTS，DPPH,和ORAC）进行了评估。最大设计温度（170°C）和墙体材料比例（15％）显着影响封装应用的响应变量，具有高抗坏血酸保留率（96.866%），低水分（0.303%），低吸湿性（7.279克/100克），水活度低（0.255），水溶性指数为23.206%，和70.285%的高收率。生物活性化合物分析和抗氧化能力呈现显著的保留值AA（96.86%），TPC（65.13%），TFC（82.09%），TA（62.46%），TCC（7.28%），GA（35.02%），CT(49.03%),QC（37.57%），ABTS（81.24%），DPPH（75.11%），和ORAC（15.68%）。因此,结论是，在这些条件下获得的粉末具有理想的物理性质，并且干燥过程保留了生物活性化合物及其抗氧化活性的显着保留。
