Shinagawa-ku, Japan
Shinagawa-ku, Japan

Time filter

Source Type

Yamamoto R.,TTI Ellebeau Inc. | Yamamoto R.,Hoshi University | Takasuga S.,TTI Ellebeau Inc. | Kominami K.,TTI Ellebeau Inc. | And 4 more authors.
Chemical and Pharmaceutical Bulletin | Year: 2013

The aim of the present study was to evaluate the feasibility of transdermal delivery of glycyrrhizin, an agent used in the treatment of chronic hepatitis C, by cathodal iontophoresis using Ag/AgCl electrodes in vitro. The effects of donor pH (pH 4-7), concentration of drug (0.025-0.2% (w/v)), concentration of external chloride ions (Cl-) (0-133 mM), current strength (0-0.5 mA/cm2), and permeation enhancers (urea and Tween 80) on the skin permeability of glycyrrhizin were examined in in vitro skin permeation studies using porcine ear skin as the membrane. The cumulative amount of permeated glycyrrhizin and the steady-state skin permeation flux of glycyrrhizin across porcine skin increased in a pH-dependent manner. The skin permeability of glycyrrhizin was independent of the concentration of drug and competed only with a high external Cl-concentration. The skin permeation flux of glycyrrhizin increased with the current (R2=0.8955). The combination of iontophoresis and enhancers provided an additive or synergistic effect, and a skin permeation flux of about 60 μg/ h/cm2 was achieved. The plasma concentration of glycyrrhizin in humans, extrapolated from the in vitro steady-state permeation flux across porcine skin, was within the therapeutic level. These results suggest that cathodal iontophoresis can be used as a transdermal drug delivery system for glycyrrhizin using reasonable patch sizes and acceptable levels of current intensity. © 2013 The Pharmaceutical Society of Japan.


Ito F.,Tokyo Metroplitan University | Takahashi T.,TTI ellebeau Inc. | Kanamura K.,Tokyo Metroplitan University | Kawakami H.,Tokyo Metroplitan University
Drug Development and Industrial Pharmacy | Year: 2013

The optimized preparation of Poly-(lactide-co-glycolic acid) (PLGA) nanospheres containing ubiquinone (UQ) for cosmetic products was pursued. By investigating various conditions for the preparation of UQ/PLGA nanospheres such as the molecular weight of PLGA, PLGA concentration, and UQ concentration, UQ/PLGA nanospheres with increased stability and slower drug release at a higher drug loading efficiency were prepared. Permeation tests on the prepared nanospheres using iontophoresis via electric dermal administration on membrane filters (200 nm pore size) and hairless mouse skin samples were also carried out. After iontophoresis, the nanospheres choked the membrane filter and remained on the horny layer of the hairless mouse skin, even after washing. Therefore, the prepared UQ/PLGA nanospheres and the established iontophoresis technique with the PLGA nanospheres in the present study can be applied to the future development of cosmetics. © 2013 Informa Healthcare USA, Inc.


Hama S.,Kyoto Pharmaceutical University | Kimura Y.,Kyoto Pharmaceutical University | Mikami A.,Kyoto Pharmaceutical University | Shiota K.,Kyoto Pharmaceutical University | And 6 more authors.
Journal of Biological Chemistry | Year: 2014

Background: Although skin is a tight barrier, transdermal liposome delivery is achievable by faint electric stimulus (ES). Results: ES caused rigid nanoparticle penetration into the epidermis, and induced connexin 43 phosphorylation, actin fiber depolymerization and Ca2 -influx. Conclusion: Our data indicate that ES opens epidermis intercellular spaces via intracellular signaling activation. Significance: Skin barrier permeability could be controlled by ES via changes in cutaneous physiological properties. © 2014 by The American Society for Biochemistry and Molecular Biology, Inc.


Haida H.,Tokyo Medical and Dental University | Ando S.,Saitama Social Welfare Agency Asaka Kouyouen Dental Clinic for Disability | Ogami S.,Aichi University | Wakita R.,Tokyo Medical and Dental University | And 7 more authors.
Journal of Medical and Dental Sciences | Year: 2012

Calcium alginate gel has some unique properties, such as the capability to keep the drugs, bioadhesiveness, safety, and low cost. The purpose of this study is to determine whether calcium alginate gel can be used as a matrix of electrodes for iontophoresis (IOP). We measured the concentration of lidocaine transported from calcium alginate gels with various concentrations of alginic acid using an in vitro experimental cell with square-wave alternating current (AC) application. Temperature and pH changes were also determined during AC-IOP. The results revealed that lidocaine was released from calcium alginate gels at concentrations nearly 1.71-fold larger at 5 V, 60 min after AC application than in the case of passive diffusion. Lidocaine transport depended on the alginic acid concentration in the gels. Although there were slight increases in temperature and pH, chemical and thermal burns were not severe enough to be a concern. In conclusion, the calcium alginate gel can be used as a possible matrix for IOP electrodes.


PubMed | TTI ellebeau Inc.
Type: Journal Article | Journal: Chemical & pharmaceutical bulletin | Year: 2013

The aim of the present study was to evaluate the feasibility of transdermal delivery of glycyrrhizin, an agent used in the treatment of chronic hepatitis C, by cathodal iontophoresis using Ag/AgCl electrodes in vitro. The effects of donor pH (pH 4-7), concentration of drug (0.025-0.2% (w/v)), concentration of external chloride ions (Cl(-)) (0-133 mM), current strength (0-0.5 mA/cm(2)), and permeation enhancers (urea and Tween 80) on the skin permeability of glycyrrhizin were examined in in vitro skin permeation studies using porcine ear skin as the membrane. The cumulative amount of permeated glycyrrhizin and the steady-state skin permeation flux of glycyrrhizin across porcine skin increased in a pH-dependent manner. The skin permeability of glycyrrhizin was independent of the concentration of drug and competed only with a high external Cl(-) concentration. The skin permeation flux of glycyrrhizin increased with the current (R(2)=0.8955). The combination of iontophoresis and enhancers provided an additive or synergistic effect, and a skin permeation flux of about 60 g/h/cm(2) was achieved. The plasma concentration of glycyrrhizin in humans, extrapolated from the in vitro steady-state permeation flux across porcine skin, was within the therapeutic level. These results suggest that cathodal iontophoresis can be used as a transdermal drug delivery system for glycyrrhizin using reasonable patch sizes and acceptable levels of current intensity.


PubMed | TTI ellebeau Inc.
Type: Journal Article | Journal: The Journal of pharmacy and pharmacology | Year: 2011

The feasibility of transdermal delivery of tramadol, a centrally acting analgesic, by anodal iontophoresis using Ag/AgCl electrodes was investigated in vitro and in vivo.To examine the effect of species variation and current strength on skin permeability of tramadol, in-vitro skin permeation studies were performed using porcine ear skin, guinea-pig abdominal skin and hairless mouse abdominal skin as the membrane. In an in-vivo pharmacokinetic study, an iontophoretic patch system was applied to the abdominal skin of conscious guinea pigs with a constant current supply (250 A/cm(2)) for 6 h. An intravenous injection group to determine the pharmacokinetic parameters for estimation of the transdermal absorption rate in guinea pigs was also included.The in-vitro steady-state skin permeation flux of tramadol current-dependently increased without significant differences among the three different skin types. In the in-vivo pharmacokinetic study, plasma concentrations of tramadol steadily increased and reached steady state (336 ng/ml) 3 h after initiation of current supply, and the in-vivo steady-state transdermal absorption rate was 499 g/cm(2) per h as calculated by a constrained numeric deconvolution method.The present study reveals that anodal iontophoresis provides current-controlled transdermal delivery of tramadol without significant interspecies differences, and enables the delivery of therapeutic amounts of tramadol.

Loading TTI Ellebeau Inc. collaborators
Loading TTI Ellebeau Inc. collaborators