Applicability of Bipolar Charge Analyzer (BOLAR) in Characterizing the Bipolar Electrostatic Charge Profile of Commercial Metered Dose Inhalers (MDIs)

Pharmaceutical Research
Sharon Shui Yee LeungH K Chan

Abstract

To investigate the applicability of Bipolar Charge Analyzer (BOLAR), a new commercial instrument developed by Dekati Ltd., in simultaneously characterizing the bipolar electrostatic charge profile and measuring the size distribution of commercial metered dose inhalers (MDIs). Intal Forte(®) (sodium cromoglycate), Tilade(®) (nedocromil sodium), Ventolin(®) (salbutamol sulphate), and QVAR(®) (beclomethasone dipropionate) were used as model MDIs in this study. Three individual actuations of each MDI were introduced into the BOLAR at an air flow rate of 60 l/min. Charge and mass profiles for each actuation were determined. The BOLAR was found to have better performance in collecting valid charge data (≥80%) than valid mass data (≥50%). In all tested products, both positively and negatively charged particles were found in five defined size fractions between zero and 11.6 μm, with the charge magnitude decreased with increasing particle size. The net charge profiles obtained from the BOLAR qualitatively agreed with the results reported previously. In all suspension type MDIs, negligible masses were detected in the smallest size fraction (<0.95 μm), for which the charge was most likely caused by the propellant and excipients. QVAR was ...Continue Reading

References

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Jan 24, 2014·AAPS PharmSciTech·Paul B MyrdalStephen W Stein

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