教師著作

Permanent URI for this collectionhttp://rportal.lib.ntnu.edu.tw/handle/20.500.12235/37076

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Author: search.filters.author.T.-R. Kuo

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    Quantitative analysis of multiple urinary biomarkers of carcinoid tumors through gold-nanoparticle-assisted laser desorption/ionization time-of-flight mass spectrometry
    (Elsevier Masson, 2011-08-05) T.-R. Kuo; J.-S. Chen; Y.-C. Chiu; C.-Y. Tsai; C.-C. Hu; Chia-Chun Chen
    A simple technique for quantitative analysis of four urinary biomarkers, tryptophan (TRP), 5-hydroxytryptophan (5-HTP), 5-hydroxytryptamine (5-HT) and 5-hydroxyindole acetic acid (5-HIAA) of carcinoid tumors is developed using gold nanoparticles as the assisted matrix in surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI–TOF MS). The optimal SALDI conditions for the efficient ionization of those biomarkers are systematically explored by the adjustments of the concentrations of gold nanoparticles and internal standards. The mass spectra with strong signals and minimal background noise are obtained using 1-naphthaleneacetamide (NAD) as the internal standard. The calibration curves of the biomarker concentrations are determined using SALDI–TOF MS and the high linearity is obtained in all samples. For future clinical testing, multiplexed detection of those biomarkers in the urine samples of healthy males is performed. The successful quantitative detections of TRP, 5-HTP, 5-HT and 5-HIAA indicate that our technique provided great potentials to be developed a simple and rapid platform for the tumor biomarker detections.
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    Oleic acid-enhanced transdermal delivery pathways of fluorescent nanoparticles
    (American Institute of Physics (AIP), 2012-05-21) W. Lo; A. Ghazaryan; C.-H. Tso; P.-S. Hu; W.-L. Chen; T.-R. Kuo; S.-J. Lin; S.-J. Chen; Chia-Chun Chen; C.-Y. Dong
    Transdermal delivery of nanocarriers provides an alternative pathway to transporttherapeutic agents, alleviating pain, improving compliance of patients, and increasing overall effectiveness of delivery. In this work, enhancement of transdermal delivery of fluorescent nanoparticles and sulforhodamine B with assistance of oleic acid was visualized utilizing multiphoton microscopy (MPM) and analyzed quantitatively using multi-photon excitation-induced fluorescent signals. Results of MPM imaging and MPM intensity-based spatial depth-dependent analysis showed that oleic acid is effective in facilitating transdermal delivery of nanoparticles.
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    Multiple Release Kinetics of Targeted Drug from Gold Nanorod Embedded Polyelectrolyte Conjugates Induced by Near-infrared Laser Irradiation.
    (American Chemical Society, 2010-10-13) T.-R. Kuo; V.-A. Hovhannisyan; Y.-C. Chao; S.-L. Chao; S.-J. Chiang; S.-J. Lin; C.-Y. Dong; Chia-Chun Chen
    The conjugates of gold nanorods and the model drug, fluorescein isothiocyanate (FITC), embedded inside polyelectrolytes (GNRs/FITC@PLE) were synthesized to study the release kinetics of FITC under femtosecond near-infrared (NIR) laser irradiation. The optical and structural properties of GNRs/FITC@PLE conjugates before and after laser treatments were examined using UV-vis spectroscopy, confocal microscopy, and transmission electron microscopy (TEM). The release of FITC from the conjugates was induced by the heat generated from gold nanorods under laser irradiation. The concentration of released FITC was measured as the time of continuous and periodic laser irradiation was varied. Within 5 min of the laser exposure, the release rates of FITC exhibited zero-order and first-order kinetics under continuous and periodic irradiation, respectively. Furthermore, a drug release system was designed based on the conjugates of gold nanorods and the anticancer drug, paclitaxel (PTX), embedded inside polyelectrolytes (GNRs/PTX@PLE). The conjugates were applied for in vitro studies with breast cancer cells. The release of PTX from the conjugates was triggered by NIR laser irradiation, and the inhibition rates of the cells showed strong dependencies on the irradiation modes and time. The results suggested that the multiple releases of PTX from the conjugates can be controlled by laser irradiation within a long period of time. Our system holds great potential for future therapeutic applications on breast cancers.
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    Studies of Intracorneal Distribution and Cytotoxicity of Quantum Dots: Risk Assessment of Eye Exposure
    (American Chemical Society, 2011-02-18) T.-R. Kuo; C.-F. Lee; S.-J. Lin; C.-Y. Dong; Chia-Chun Chen; H.-Y. Tan
    The cornea is a potential route of exposure and drug administration for nanoparticles. In this work, we use noninvasive two-photon microscopic imaging to study the distribution and permeability pathway of CdSe/ZnS core/shell quantum dots (QDs) capped with three different functional groups through the cornea. With no additional staining, the two-photon image clearly discloses that fluorescent QDs penetrate and reside within the interlamellar space of second harmonic generating collagenous stroma when the corneal epithelium barrier is injured. An in vitro cytotoxicity test using bovine corneal stromal cells incubated individually with all three kinds of QDs indicates that the cell viability decreases significantly as the QD concentration and incubation period increased. The results also show that the specific QDs influence corneal stromal cell viability up to a significant magnitude of 50% under a relatively low concentration (5−20 nM) and short exposure period (24−48 h). Furthermore, two-photon imaging shows that QDs can be retained within the cornea up to 26 days in an in vivo mouse model. On the basis of our in vivo and in vitro data, we conclude that QDs can penetrate and be retained within cornea long enough to cause consequential cytotoxicity, under the circumstance in which the corneal epithelium barrier is injured. Since corneal abrasion is quite a common situation in daily life, our work raises public attention to the potential risk of eye exposure to nanoparticles.
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    Chemical Enhancer Induced Changes in the Mechanisms of Transdermal Delivery of Zinc Oxide Nanoparticles
    (Elsevier, 2009-06-01) T.-R. Kuo; C.-L.Wu; C.-T. Hsu; W. Lo; S.-J. Chiang; S.-J. Lin; C.-Y. Dong; Chia-Chun Chen
    The overlapping wavelength of photoluminescence (PL) of zinc oxide nanoparticles (ZnO NPs) and autofluorescence (AF) from the stratum corneum (SC) has for a long time held back researchers from investigating the chemically enhanced penetration pathways of ZnO NPs into the SC lipids. However, the non-linear polarization effect of second harmonic generation (SHG) may be used for ZnO NPs to be distinguished from the AF of the SC. This study combined the SHG of ZnO NPs and the AF of the SC to image the transdermal delivery of ZnO NPs under the chemical enhancer conditions of oleic acid (OA), ethanol (EtOH) and oleic acid-ethanol (OA-EtOH). In addition to qualitative imaging, the microtransport properties of ZnO NPs were quantified to give the enhancements of the vehicle-to-skin partition coefficient (K), the SHG intensity gradient (G) and the effective diffusion path length (L). The results showed that OA, EtOH and OA-EtOH were all capable of enhancing the transdermal delivery of ZnO NPs by increasing the intercellular lipid fluidity or extracting lipids from the SC.