METHOD: Glycoalkaloid Assay METHOD NARR: Extraction and analysis procedures for the identification of ammonia precipitable glycoalkyloids by thin-layer and gas chromatography and the determination of TGA content by titration were& Osman 1986. RESULTS NARR: Glycoalkaloids in potatoes are generally regarded as toxic at 20mg/100g or greater, and unpalatable to humans. Most of the wild tubers used in the study are potentially toxic and unplalatable. Llycoalkaloids in Mexican cph and ehr is consistent with the suggestion that nontoxic, edible potatoes exist in the wild. Exploitation of buk would require little or no selection for gycoalkaloid content due to moderately low le Authors discuss origins of domesticated potato considering TGA content of likely progenitor species.