Quantifying the Degree of Disorder in Micronized Salbutamol Sulfate Using Moisture Sorption Analysis

ABSTRACT

Salbutamol sulfate is often micronized for use in dry powder inhalers. Therefore, it is of high interest to quantify the amorphous amount. It was investigated whether moisture sorption is able to measure the amorphous content of salbutamol sulfate. Different mixtures of amorphous and crystalline salbutamol sulfate were analyzed by moisture sorption. The amorphous material was obtained by spray drying. The measurement results were used to plot a calibration curve, which was used to quantify the amorphous amount in micronized salbutamol sulfate.

KEYWORDS:

• Salbutamol sulfate
• Dynamic vapor sorption
• Moisture sorption
• Crystallinity
• Amorphicity
• Milling