The method of extracting amino acid by trichtroacetic acid to measure free amino acid of bear gall is signifcance in appraising the quality of series products of bear gall.

• 以三氯乙酸提取氨基酸的方法来测定熊胆的游离氨基酸,在熊胆系列产品的质量鉴定方面有较大意义。