Bai - Xiang Xu

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This article reports an in vitro study of microneedle-array-enhanced transdermal transport of model drug compounds dispersed in chitosan films. Each microneedle array has 400 out-of-plane, needle-shaped microstructures fabricated using micro-electro-mechanical systems (MEMS) technology to ensure adequate mechanical strength and high precision, and(More)
Methods to facilitate topical anesthesia for venipuncture are characterized by substantial limitations. This randomized double-blind study was undertaken to assess whether use of a quickly and painlessly applied microneedle system (functional microarray, FMA) to create punctures in the stratum corneum facilitates topical anesthesia in healthy adults. In 25(More)
Transcutaneous immunization (TCI) with dissolving microneedle arrays (DMAs) is a promising vaccine administration method. In this work, we developed a TCI device consisting of dissolving polyvinylpyrrolidone (PVP) microneedles array, where in the tips are loaded with antigen and adjuvant encapsulated in liposomes. The microneedles could effectively be(More)
DNA vaccines are simple to produce and can generate strong cellular and humoral immune response, making them attractive vaccine candidates. However, a major shortcoming of DNA vaccines is their poor immunogenicity when administered intramuscularly. Transcutaneous immunization (TCI) via microneedles is a promising alternative delivery route to enhance the(More)
This study was designed to investigate in vitro release, in vivo tissue distribution and the damage to the lungs of 9-nitrocamptothecin (9-NC) liposomes. In vitro release of 9-NC from liposomes was carried out in phosphate buffer saline solution (PBS) pH 7.4. The tissue distribution of 9-NC liposomes and 9-NC solution was determined after pulmonary delivery(More)
UNLABELLED Insulin delivery relies on subcutaneous or intravascular injection, leading to reduced patient compliance. Transdermal delivery of insulin has been successfully demonstrated but dose accuracy and skin irritation are problematic in addition to the complex basal-bolus delivery profile required by insulin therapy. Here we present a novel(More)
An intradermal microdelivery system comprising a wafer having 150-mum long microneedles and an applicator was used for controlled release of insulin. Insulin was topically applied on microneedle-pretreated skin. In vitro percutaneous studies showed that the penetration amount of FITC-Insulin following microneedle pretreatment was enhanced significantly and(More)
We have fabricated electrochemical electrodes in picolitersized wells for measuring catecholamine release from individual cells with millisecond resolution. Each well-electrode roughly conforms to the shape of the cell in order to capture a large fraction of released catecholamine with high time resolution. Using this device, we can resolve spikes in(More)
A lyophilized hydrogel patch system was developed for microneedle-mediated insulin delivery. The matrix of Cross-linked poly(acrylamide-co-acrylic acid) were synthesized by precipitation polymerization. Recombinant human Insulin was loaded into the lyophilized polymer matrix, which can be rehydrated by water. After the hydrated patch was applied to the(More)
Transcutaneous immunization (TCI) has many advantages compared with needle-based administrations. But the conventional TCI shows poor permeation of antigens across the skin barrier. In this study, Functional MicroArray (FMA) system was used to poke the skin and increase the permeability, and the hydrogel patch formulation was used as the carrier for(More)