Determination of content of hyoscyamine in compound belladonna mixture by acid dye colorimetry

Key words: 
• acid dye colorimetry /
• compound belladonna mixture /
• hyoscyamine /
• content

Abstract: Objective: To determine hyoscyamine in compound belladonna mixture. Methods: Acid dye colorimetry was used in pH 6.6 with the detection wavelength at(589±1)nm. Results: The linear ranges of the standard curve was 1.2～7.2μg/mL(r= 0.9991).The average recovery of the assay was 100.02%(RSD=0.69%,n=4). Conclusions: This method is accurate,convenient and sensitive for the quality control of hyoscyamine in compound belladonna mixture.The key of this method is exactly control of pH in order to avoid the disturbance.