The application of ohmic heating for inulin extraction from the wet-milled and dry-milled powders of Jerusalem artichoke (Helianthus tuberosus L.) tuber

Jerusalem artichoke (Helianthus tuberosus L.) has been widely cultivated in many countries. Jerusalem artichoke tubers (JAT) accumulates inulin as a main carbohydrate reserve; hence, it has high potential to be raw material for inulin powder production. Nowadays, inulin is generally used by the food and beverage industries as a soluble dietary fiber, prebiotic and fat or sugar replacer. The extraction is a crucial process for producing inulin powder from JAT. The result of this work revealed that ohmic heating method provided higher inulin extraction yield than conventional heating method. Furthermore, the sample preparation using dry milling provided the higher extraction yield and inulin purity than that of wet milling. This information is vital for the inulin powder manufacturers to make a decision for their production facility concept and design.