The high content of bioactive compounds in the microalga Spirulina platensis has recently attracted attention from food and pharmaceutical industries. However, for its application an effective preservation technique must be developed. In this paper, we investigated the use of a non-conventional rotary dryer (with an inert bed) for drying the microalga Spirulina biomass and the effects of the operational conditions (air temperature, intermittent feeding interval, filling degree of inert particles, and rotation speed) on its bioactive compounds. The results indicated that this non-conventional drying system offers an effective alternative for expanding the use of this biomass in an adequate form. We identified the conditions in which the dried material had maintained satisfactory contents of phenolics (air temperature of 70 °C and intermittent feeding interval of 10 min), flavonoids (intermittent feeding interval of 17.4 min), and phycocyanin compounds (air temperature of 40 °C), which were near to those present in fresh microalga.

微藻螺旋藻中高含量的生物活性化合物最近引起了食品和制药行业的关注。但是，对于其应用，必须开发一种有效的保存技术。在本文中，我们研究了使用非常规旋转干燥机（带有惰性床）干燥微藻螺旋藻生物质的方法以及操作条件（空气温度，间歇进料间隔，惰性颗粒的填充度和旋转）的影响速度）的生物活性化合物。结果表明，这种非常规的干燥系统为有效利用这种生物质提供了一种有效的替代方法。我们确定了干燥物料保持令人满意的酚醛含量（气温为70°C，间歇进料间隔为10分钟），类黄酮（间歇进料间隔为17）的条件。