Objective: To investigate the effect of different domestic cooking methods on anthocyanin,glucosinolates, capsaicin and V C in purple sweet potato,broccoli and green pepper. Methods: Three kinds of vegetable were treated by microwave cooking,steaming,scalding and stir-frying.Then pH differential spectrophotometry was used to determine anthocyanin,HPLC to determine glucosinolates and capsaicin,and 2,6-dichlorophenol titrimetry to determine V C.Results: Steaming preserved V C was better than Microwave-steamin...