Traditional detoxification of wild yam (Dioscorea hispida Dennst) tuber in chips processing at East Java, Indonesia

Abstract Dioscoreaceae or yam is a family of tuber that comprises many members with variability in utilization and their intensity consumption. This has wide used not only as food but also for medical purposes due to bioactive compounds. One the wild ( Dioscorea hispida Dennst), rich carbohydrates an obstacle high cyanide level. Historically, along cassava, staple some places Indonesia. There long history traditional detoxification methods slightly different steps among places. The shifting rice excludes remaining products from chips. Wild chips are snack produced by detoxification. paper aimed review scientific basis each step processing remove cyanogenic was based on observations chip unstructured interview maker at 6 locations East Java, Relevant literature explain definite inclusion exclusion criteria. Also, compared locations. In general, during slicing peeled tubers, mixing rubbing ash, pressing, drying, soaking, boiling/steaming, sun drying. Slicing, rubbing, pressing convert glycoside into acetone cyanohydrin. alkaline pH ash makes spontaneous decomposition cyanohydrin HCN. HCN easily removed dissolution heating (drying steaming/boiling). Thermal treatment spontaneously decomposes free All compounds water-soluble which soaking washing all Consecutive, complicated, time-consuming completely removes produces safe key finding this purpose every reduce gradually. process very low level final product. conclusion, detoxication reduces