Abstract

Camu-Camu (Myrciaria dubia) is a native fruit from the Amazon region, which is still little known by most people, but that has been arousing great interest from the scientific community due to its significant concentrations of important bioactive compounds. In this work, the drying of Camu-Camu pulp was investigated using an alternative system: a rotary drum with an inert bed. In this nonconventional rotary dryer the surface contact between hot air and the pasty material is enhanced by the presence of a bed of inert particles inside the drum, in addition it prevents loss of material on the walls and drum structure. The inert bed had particles of three different diameters: 25.40 mm; 19.05 mm and 12.70 mm, including the binary combinations among them. DEM (discrete element method) simulations were performed to evaluate the effect of the different particles bed, as well as the operational variables (rotation speed, filling degree and inert fraction) on the collisional force and the number of collisions. An optimization study using the desirability function was performed to find the best inert mixture. The highest experimental yield was 86.66%, which was obtained using a combination of the biggest particles (high collisional force) and smallest particles (high number of collisions). The product quality was evaluated in terms of bioactive compounds content (ascorbic acid, total phenolic content, total flavonoid content and antioxidant capacity). The results showed that this nonconventional system presented a good performance to obtain the powder of Camu-Camu fruit with a good quality.

摘要

Camu-Camu ( Myrciaria dubia)) 是亚马逊地区的一种原生水果，大多数人仍然鲜为人知，但由于其重要的生物活性化合物浓度很高，它引起了科学界的极大兴趣。在这项工作中，使用替代系统研究了 Camu-Camu 纸浆的干燥：带有惰性床的转鼓。在这种非传统的旋转式干燥机中，热空气和糊状材料之间的表面接触由于滚筒内部的惰性颗粒床而得到增强，此外它还防止了物料在壁和滚筒结构上的损失。惰性床具有三种不同直径的颗粒：25.40 mm；19.05 毫米和 12.70 毫米，包括它们之间的二进制组合。进行 DEM（离散元方法）模拟以评估不同颗粒床的影响，以及碰撞力和碰撞次数的操作变量（转速、填充度和惰性分数）。使用意愿函数进行优化研究以找到最佳惰性混合物。最高的实验产率为 86.66%，这是使用最大粒子（高碰撞力）和最小粒子（高碰撞次数）的组合获得的。产品质量根据生物活性化合物含量（抗坏血酸、总酚含量、总黄酮含量和抗氧化能力）进行评估。结果表明，该非常规体系在获得优质卡姆果粉方面表现出良好的性能。填充度和惰性分数）对碰撞力和碰撞次数的影响。使用意愿函数进行优化研究以找到最佳惰性混合物。最高的实验产率为 86.66%，这是使用最大粒子（高碰撞力）和最小粒子（高碰撞次数）的组合获得的。产品质量根据生物活性化合物含量（抗坏血酸、总酚含量、总黄酮含量和抗氧化能力）进行评估。结果表明，该非常规体系在获得优质卡姆果粉方面表现出良好的性能。填充度和惰性分数）对碰撞力和碰撞次数的影响。使用意愿函数进行优化研究以找到最佳惰性混合物。最高的实验产率为 86.66%，这是使用最大粒子（高碰撞力）和最小粒子（高碰撞次数）的组合获得的。产品质量根据生物活性化合物含量（抗坏血酸、总酚含量、总黄酮含量和抗氧化能力）进行评估。结果表明，该非常规体系在获得优质卡姆果粉方面表现出良好的性能。这是使用最大粒子（高碰撞力）和最小粒子（高碰撞次数）的组合获得的。产品质量根据生物活性化合物含量（抗坏血酸、总酚含量、总黄酮含量和抗氧化能力）进行评估。结果表明，该非常规体系在获得优质卡姆果粉方面表现出良好的性能。这是使用最大粒子（高碰撞力）和最小粒子（高碰撞次数）的组合获得的。产品质量根据生物活性化合物含量（抗坏血酸、总酚含量、总黄酮含量和抗氧化能力）进行评估。结果表明，该非常规体系在获得优质卡姆果粉方面表现出良好的性能。