Tetracaine was used as a internal standard.

选择丁卡因作为内标准品。

METHODS The contents of tetracaine hydrochloride were measured by spectrophotometry.

方法采用分光光度法对盐酸丁卡因进行含量测定。

OBJECTIVE to study the stability and effected factors of 2% tetracaine hydrochloride.

目的研究2%盐酸丁卡因溶液的稳定性及影响因素。

OBJECTIVE To study the stability and expiration of tetracaine hydrochloride injection.

目的研究盐酸丁卡因注射液的稳定性及贮存期。

OBJECTIVE To prepare tetracaine hydrochloride gel and work out its quality control standard.

目的制备盐酸丁卡因凝胶剂，并建立质量控制标准。