In vivo analysis of supersaturation/precipitation/absorption behavior after oral administration of pioglitazone hydrochloride salt; determinant site of oral absorption.
Tanaka Y, Sugihara M, Kawakami A, Imai S, Itou T, Murase H, Saiki K, Kasaoka S, Yoshikawa H. Eur J Pharm Sci. 2017, 106:431-438.

In vivo evaluation of supersaturation/precipitation/re-dissolution behavior of cinnarizine, a lipophilic weak base, in the gastrointestinal tract: the key process of oral absorption.
Tanaka Y, Kawakami A, Nanimatsu A, Horio M, Matsuoka J, Wada T, Kasaoka S, Yoshikawa H. Eur J Pharm Sci. 2017. 1:464-471.

Effect of Absorption Behavior of Solubilizers on Drug Dissolution in the Gastrointestinal Tract: Evaluation Based on In Vivo Luminal Concentration-Time Profile of Cilostazol, a Poorly Soluble Drug, and Solubilizers.
Tanaka Y, Kubota A, Matsuo A, Kawakami A, Kamizi H, Mochigoe A, Hiramachi T, Kasaoka S, Yoshikawa H, Nagata S. J Pharm Sci. 2016. 105:2825-31.

Impact of Luminal Fluid Volume on the Drug Absorption After Oral Administration: Analysis Based on In Vivo Drug Concentration-Time Profile in the Gastrointestinal Tract.
Tanaka Y, Goto T, Kataoka M, Sakuma S, Yamashita S. J Pharm Sci. 2015. 104:3120-7.