A pesticide powder prepared from four Chinese herbal medicine extracts as the active ingredient: Optimization of preparation process and quality examination

Abstract

To optimize the preparation process of a wettable powder using four traditional Chinese medicine extracts, namely Artemisia argyi Lévl. et Van., Sophora alopecuroides L., Hippophae rhamnoides L. and Juniperus sabina L., which are used as raw materials for the production of traditional Chinese medicine extract wettable powder, by adding suitable carriers and additives. Traditional Chinese medicine extract wettable powder was prepared by directly mixing the raw materials, carriers, and additives, followed by grinding and sieving. Types of carriers, dispersants, wetting agents, the ratio of dispersant to wetting agent, and the amount of additives were examined as factors in the optimization of the preparation process for the wettable powder using the orthogonal experimental design method, based on the single-factor experiment. When the carrier is bentonite, the dispersant is calcium lignosulfonate, the wetting agent is tide laundry detergent, the ratio of dispersant to wetting agent is 1: 9, the amount of additives added is 15 %, the comprehensive score of the prepared wettable powder is the highest, being up to 80.64 %, the quality inspection meets the general requirements. The optimized preparation process of the traditional Chinese medicine extract wettable powder is demonstrated to be feasible and provides a reference and technical support for further development and subsequent field trials of extract powders.