Design of a polyherbal mix by supercritical carbon dioxide extraction and its encapsulation by spray drying: Phytochemical properties and shelf-life study of the encapsulate

摘要

A polyherbal mix of tulsi leaves, bay leaves, and small cardamom seeds powder was subjected to supercritical carbon dioxide (SC-CO2) extraction. Highest yield of the extract along with the maximum antioxidant potency was obtained with a 20 g powdered mix (optimized) of 1:1:2 of tulsi leaf:bay leaf:small cardamom seed at extraction conditions of 60 degrees C, 300 bar, 90 min at a flow rate of 2.5 L/min of gaseous CO2. The optimized condition of microencapsulation of the same was achieved at an inlet air temperature of 140 degrees C with 60:40 of maltodextrin:gum arabic as wall material. Storage stability study established this herbal encapsulate to be a promising novel natural antioxidant for food and pharmaceutical applications.