Spray dried aqueous extract of Orthosiphon aristatus Blume (Java tea)

ABSTRACT Orthosiphon aristatus (Lamiaceae) is an herb medicinal found mainly in China, Indian and South East Asia. The purpose of this work was to develop a technological process for obtaining dry extract of Orthosiphon aristatus by spray dry. A process for the obtaining of dry extract from aqueous extract of Orthosiphon aristatus was studied. Response Surface Methodology experimental design was applied to evaluate the effects of inlet and outlet air temperature on drying yield (%). Mixture experimental design was applied to evaluate the drying adjuvant - total solids relation. Maltodextrin was evaluated as drying adjuvant. The best results were obtained when applying an inlet temperature of 120 °C and outlet temperature of 80 °C and a drying adjuvant - total solids relation (w/w) of 60:40. Under these conditions it was demonstrated that the process is reproducible scale studied.

摘要 肾茶（Orthosiphon aristatus）隶属于唇形科（Lamiaceae），是一种药用草本植物，主要分布于中国、印度及东南亚地区。本研究旨在开发一套采用喷雾干燥法制备肾茶干浸膏的工艺路线。本研究针对肾茶水提液制备干浸膏的工艺进行了系统探究：采用响应面法（Response Surface Methodology, RSM）实验设计，分析进风温度与出风温度对干燥得率（%）的影响规律；采用混合实验设计，探究干燥助剂与总固形物的配比关系。本研究选取麦芽糊精（Maltodextrin）作为干燥助剂。当进风温度为120℃、出风温度为80℃，且干燥助剂与总固形物的质量比（w/w）为60:40时，可取得最优工艺效果。研究证实，在该最优工艺条件下，所考察的放大规模生产流程具有良好的重现性。