Determination for Total Organic Acids in Rhizoma Arisaematis by Residual Titration

OBJECTIVE To establish a quantitative method for the total organic acids in Rhizoma Arisaematis.METHODS The acid-base residual titration was applied,with phenolphthalein as its indicator.RESULTS Through the study methodology,approach was consistent with determination requirements.The average recovery rate was 100.8%(RSD=1.1%,n=6).The 17 batches of medicines were determined,Citric Acid(C6H8O7) as a reference,the total organic acid content between 1.81%~2.97%(RSD=0.06%~1.0%,n=3).CONCLUSION This method is simple,accurate and can be used to determine the total organic acid in Rhizoma Arisaematis.