DissolvIt: An In Vitro Method for Simulating the Dissolution and Absorption of Inhaled Dry Powder Drugs in the Lungs.
The main purpose of this work was to develop an in vitro method for simulating the dissolution and absorption of inhaled dry powder drugs that also mimics systemic pharmacokinetic data. A second purpose was to evaluate this method. DissolvIt®was developed as a simulation of the air-blood barrier of the upper airways, constituting: "airborne" particles deposited on a glass cover slip, a mucus simulant, a polycarbonate (basal) membrane, and a pumped albumin buffer simulating the pulmonary blood flow. The PreciseInhale®exposure system was used to aerosolize and deposit test formulations onto cover slips. The particle dissolution was observed by optical microscopy as particle disappearance, and it was started directly when the particles came into contact with the mucus simulant. Solute from the dissolving particles diffused through the barrier and was absorbed into the perfusate. The drug concentration in the perfusate over time and the remaining drug in the barrier at the end of the experiment were quantitated by using liquid chromatography-tandem mass spectrometry. Budesonide and fluticasone propionate generated different pharmacokinetic dissolution/absorption profiles in DissolvIt. This study indicates that DissolvIt simulates dissolution and absorption of drugs in the lung, and that DissolvIt also mimics pharmacokinetic profiles and parameters.
1 Inhalation Sciences Sweden AB , Novum, Sweden .|2 Division of Physiology, Institute of Environmental Medicine, Karolinska Institutet , Stockholm, Sweden .
Per
P
Gerde
1 Inhalation Sciences Sweden AB , Novum, Sweden .|2 Division of Physiology, Institute of Environmental Medicine, Karolinska Institutet , Stockholm, Sweden .
Maria
M
Malmlöf
1 Inhalation Sciences Sweden AB , Novum, Sweden .
Lina
L
Havsborn
3 Flexura AB , Upplands Väsby, Sweden .
Carl-Olof
CO
Sjöberg
4 Astra Zeneca Ltd , Mölndal, Sweden .
Pär
P
Ewing
5 Astra Zeneca Ltd , Lund, Sweden .
Stefan
S
Eirefelt
5 Astra Zeneca Ltd , Lund, Sweden .
Katarina
K
Ekelund
D065966:Absorption, Physicochemical; D000280:Administration, Inhalation; D040761:Biomimetic Materials / Q000493:pharmacokinetics; D004867:Equipment Design; D008168:Lung / Q000737:chemistry*; D044085:Microfluidics / Q000295:instrumentation; D009093:Mucus / Q000737:chemistry*; D011208:Powders / Q000008:administration & dosage* / Q000737:chemistry*; D065589:Respiratory Tract Absorption; D012995:Solubility
D011208:Powders
aerosol generation; dissolution testing; dry powder; in vitro dissolution method; inhalation; lung dissolution