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https://www.readbyqxmd.com/read/28220163/a-microneedle-biosensor-for-minimally-invasive-transdermal-detection-of-nerve-agents
#1
Rupesh K Mishra, A M Vinu Mohan, Fernando Soto, Robert Chrostowski, Joseph Wang
A microneedle electrochemical biosensor for the minimally invasive detection of organophosphate (OP) chemical agents is described. The new sensor relies on the coupling of the effective biocatalytic action of organophosphorus hydrolase (OPH) with a hollow-microneedle modified carbon-paste array electrode transducer, and involves rapid square-wave voltammetric (SWV) measurements of the p-nitrophenol product of the OPH enzymatic reaction in the presence of the OP substrate. The scanning-potential SWV transduction mode offers an additional dimension of selectivity compared to common fixed-potential OPH-amperometric biosensors...
February 21, 2017: Analyst
https://www.readbyqxmd.com/read/28216463/successful-application-of-large-microneedle-patches-by-human-volunteers
#2
Anastasia Ripolin, James Quinn, Eneko Larrañeta, Eva Maria Vicente-Perez, Johanne Barry, Ryan F Donnelly
We describe, for the first time, the design, production and evaluation of large microneedle patches. Such systems, based on 16 individual microneedle arrays (needle height 600μm), were prepared from aqueous blends of 15% w/w Gantrez(®) S97 and 7.5% w/w poly(ethyleneglycol) 10,000Da. Ester-based crosslinking was confirmed by FTIR and mechanical strength was good. Insertion depths in a validated skin model were approximately 500μm. Ten human volunteers successfully self-inserted the microneedles of these larger patches in their skin, following appropriate instruction, as confirmed by transepidermal water loss measurements...
February 16, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28187179/fabrication-of-a-ti-porous-microneedle-array-by-metal-injection-molding-for-transdermal-drug-delivery
#3
Jiyu Li, Bin Liu, Yingying Zhou, Zhipeng Chen, Lelun Jiang, Wei Yuan, Liang Liang
Microneedle arrays (MA) have been extensively investigated in recent decades for transdermal drug delivery due to their pain-free delivery, minimal skin trauma, and reduced risk of infection. However, porous MA received relatively less attention due to their complex fabrication process and ease of fracturing. Here, we present a titanium porous microneedle array (TPMA) fabricated by modified metal injection molding (MIM) technology. The sintering process is simple and suitable for mass production. TPMA was sintered at a sintering temperature of 1250°C for 2 h...
2017: PloS One
https://www.readbyqxmd.com/read/28184159/a-combined-approach-of-hollow-microneedles-and-nanocarriers-for-skin-immunization-with-plasmid-dna-encoding-ovalbumin
#4
Boonnada Pamornpathomkul, Adisak Wongkajornsilp, Wanida Laiwattanapaisal, Theerasak Rojanarata, Praneet Opanasopit, Tanasait Ngawhirunpat
The aim of this study was to investigate the use of different types of microneedles (MNs) and nanocarriers for in vitro skin permeation and in vivo immunization of plasmid DNA encoding ovalbumin (pOVA). In vitro skin permeation studies indicated that hollow MNs had a superior enhancing effect on skin permeation compared with solid MN patches, electroporation (EP) patches, the combination of MN and EP patches, and untreated skin. Upon using hollow MNs combined with nanocarriers for pOVA delivery, the skin permeation was higher than for the delivery of naked pOVA, as evidenced by the increased amount of pOVA in Franz diffusion cells and immunoglobulin G (IgG) antibody responses...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28171813/effect-of-honeybee-stinger-and-its-microstructured-barbs-on-insertion-and-pull-force
#5
Jintian Ling, Zhenhua Song, Jiarui Wang, Keyun Chen, Jiyu Li, Shujia Xu, Lei Ren, Zhipeng Chen, Dianwen Jin, Lelun Jiang
Worker honeybee is well-known for its stinger with microscopic backward-facing barbs for self-defense. The natural geometry of the stinger enables painless penetration and adhesion in the human skin to deliver poison. In this study, Apis cerana worker honeybee stinger and acupuncture microneedle (as a barbless stinger) were characterized by Scanning Electron Microscope (SEM). The insertion and pull process of honeybee stinger into rabbit skin was performed by a self-developed mechanical loading equipment in comparison with acupuncture needle...
January 25, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28168430/poly-lactic-co-glycolic-acid-drug-delivery-systems-through-transdermal-pathway-an-overview
#6
REVIEW
Lucas Naves, Chetna Dhand, Luis Almeida, Lakshminarayanan Rajamani, Seeram Ramakrishna, Graça Soares
In past few decades, scientists have made tremendous advancement in the field of drug delivery systems (DDS), through transdermal pathway, as the skin represents a ready and large surface area for delivering drugs. Efforts are in progress to design efficient transdermal DDS that support sustained drug release at the targeted area for longer duration in the recommended therapeutic window without producing side-effects. Poly(lactic-co-glycolic acid) (PLGA) is one of the most promising Food and Drug Administration approved synthetic polymers in designing versatile drug delivery carriers for different drug administration routes, including transdermal drug delivery...
February 6, 2017: Progress in biomaterials
https://www.readbyqxmd.com/read/28161442/transdermal-delivery-of-cimetidine-across-microneedle-treated-skin-effect-of-extent-of-drug-ionization-on-the-permeation
#7
Yang Song, Anushree Herwadkar, Meera G Patel, Ajay K Banga
The objective of this work was to optimize a gel formulation of cimetidine to maximize its transdermal delivery across microporated skin. Specifically, the effect of extent of ionization in formulation on permeation of cimetidine across microporated skin was studied. Cimetidine was formulated into a gel using propylene glycol, water and carbopol 980NF. Three strengths of gels (0.1% w/w, 0.5% w/w and 0.8% w/w) were made and Tris base was used to adjust the pH of formulations to pH 5, pH 6.8 and pH 7.5. In vitro permeation testing was performed on vertical Franz cells with dermatomed porcine ear skin...
February 1, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28160258/effect-of-microneedles-on-transdermal-permeation-enhancement-of-amlodipine
#8
Buchi N Nalluri, Chandrateja Uppuluri, Jyothirmayee Devineni, Atul Nayak, Karthik J Nair, Benjamin R Whiteside, Diganta B Das
The present study aimed to investigate the effect of microneedle (MN) geometry parameters like length, density, shape and type on transdermal permeation enhancement of amlodipine (AMLO). Two types of MN devices viz. AdminPatch® arrays (ADM) (0.6, 1.2 and 1.5 mm lengths) and laboratory-fabricated polymeric MNs (PM) of 0.6 mm length were employed. In the case of PMs, arrays were applied thrice at different places within a 1.77-cm(2) skin area (PM-3) to maintain the MN density closer to 0.6 mm ADM. Scaling analyses were done using dimensionless parameters like concentration of AMLO (Ct/Cs), thickness (h/L) and surface area of the skin (Sa/L(2))...
February 3, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/28160208/enhancement-of-skin-permeation-and-skin-immunization-of-ovalbumin-antigen-via-microneedles
#9
Boonnada Pamornpathomkul, Theerasak Rojanarata, Praneet Opanasopit, Tanasait Ngawhirunpat
The purpose of this study was to evaluate the use of different types of microneedles and doses of ovalbumin antigen for in vitro skin permeation and in vivo immunization. In vitro skin permeation experiments and confocal laser scanning microscopy revealed that hollow microneedles had a superior enhancing effect on skin permeation compared with a solid microneedle patch and untreated skin by efficiently delivering ovalbumin-fluorescein conjugate into the deep skin layers. The flux and cumulative amount of ovalbumin-fluorescein conjugate at 8 h after administering with various conditions could be ranked as follows: hollow MN; high dose > medium dose > low dose > MN patch; high dose > medium dose > low dose > untreated skin; high dose > medium dose > low dose > without ovalbumin-fluorescein conjugate...
February 3, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28146245/comparison-of-physical-pretreatment-regimens-to-enhance-protoporphyrin-ix-uptake-in-photodynamic-therapy-a-randomized-clinical-trial
#10
Christiane Bay, Catharina Margrethe Lerche, Bradford Ferrick, Peter Alshede Philipsen, Katrine Togsverd-Bo, Merete Haedersdal
Importance: Skin pretreatment is recommended for adequate penetration of topical photosensitizing agents and subsequent protoporphyrin IX (PPIX) accumulation in photodynamic therapy (PDT). Objective: To compare the relative potential of different physical pretreatments to enhance PPIX fluorescence in normal skin. Design, Setting, and Participants: This intraindividual, randomized clinical trial was performed from November 28 to December 20, 2014, at Bispebjerg Hospital, Copenhagen, Denmark, among 12 healthy volunteers 18 years or older...
February 1, 2017: JAMA Dermatology
https://www.readbyqxmd.com/read/28131383/transcutaneous-immunization-of-streptococcus-suis-bacterin-using-dissolving-microneedles
#11
Kai-Jen Hsueh, Mei-Chin Chen, Li-Ting Cheng, Jai-Wei Lee, Wen-Bin Chung, Chun-Yen Chu
Vaccine delivery using microneedle (MN) patches is an easy, safe and painless alternative to traditional needle injections. In this study, we examined whether MN patches can enhance the efficacy of a Streptococcus suis serotype 2 (S. suis 2) vaccine in a mouse model. Results showed that MNs can reach 200-250μm into the skin, a depth beneficial for targeted delivery of antigens to antigen-presenting cells in the epidermis and dermis. Vaccination with prime-boost of MN induced higher levels of IgG2a antibody titer, T cell proliferation, and TH1 cytokines (IFN-γ and IL-12) as compared to intramuscular (IM) injection...
February 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/28095556/combination-therapy-for-acne-scarring-personal-experience-and-clinical-suggestions
#12
Lucija Kroepfl, Jason J Emer
Acne is one of the most prevalent skin conditions seen by dermatologists. The cosmetic sequelae of severe acne, including scarring and pigmentation, have a profound psychological impact on those in icted. Topical (eg, retinoids, antibiotics, dapsone, hydroxyacids) and oral treatments (eg, antibiotics and/or spironolactone) are often bene cial to control acne or in the instance of oral isotretinoin use, rid the acne permanently; however, these treatments have very little affect on the ultimate cosmetic outcome of the acne scarring and skin texture that results...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28088750/continuous-minimally-invasive-alcohol-monitoring-using-microneedle-sensor-arrays
#13
A M Vinu Mohan, Joshua Ray Windmiller, Rupesh K Mishra, Joseph Wang
The present work describes an attractive skin-worn microneedle sensing device for the minimally invasive electrochemical monitoring of subcutaneous alcohol. The device consists of an assembly of pyramidal microneedle structures integrated with Pt and Ag wires, each with a microcavity opening. The microneedle aperture was modified by electropolymerizing o-phenylene diamine onto the Pt wire microtransducer, followed by the immobilization of alcohol oxidase (AOx) in an intermediate chitosan layer, along with an outer Nafion layer...
May 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28079384/hypoxia-and-h2o2-dual-sensitive-vesicles-for-enhanced-glucose-responsive-insulin-delivery
#14
Jicheng Yu, Chenggen Qian, Yuqi Zhang, Zheng Cui, Yong Zhu, Qundong Shen, Frances S Ligler, John B Buse, Zhen Gu
A glucose-responsive closed-loop insulin delivery system mimicking pancreas activity without long-term side effect has the potential to improve diabetic patients' health and quality of life. Here, we developed a novel glucose-responsive insulin delivery device using a painless microneedle-array patch containing insulin-loaded vesicles. Formed by self-assembly of hypoxia and H2O2 dual-sensitive diblock copolymer, the glucose-responsive polymersome-based vesicles (d-GRPs) can disassociate and subsequently release insulin triggered by H2O2 and hypoxia generated during glucose oxidation catalyzed by glucose specific enzyme...
January 12, 2017: Nano Letters
https://www.readbyqxmd.com/read/28078629/effect-of-microneedle-type-on-transdermal-permeation-of-rizatriptan
#15
Chandrateja Uppuluri, Ashraf Sultana Shaik, Tao Han, Atul Nayak, Karthik J Nair, Benjamin R Whiteside, Buchi N Nalluri, Diganta B Das
The present study was aimed to investigate the effect of salient microneedle (MN) geometry parameters like length, density, shape and type on transdermal permeation of rizatriptan (RIZ). Studies were carried out using two types of MN devices viz. AdminPatch® arrays (ADM) (0.6, 0.9, 1.2 and 1.5 mm lengths) and laboratory-fabricated polymeric MNs (PMs) of 0.6 mm length. In the case of the PMs, arrays were applied three times at different places within a 1.77-cm(2) skin area (PM-3) to maintain the MN density closer to 0...
January 11, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28075069/ebola-vaccination-using-a-dna-vaccine-coated-on-plga-pll-%C3%AE-pga-nanoparticles-administered-using-a-microneedle-patch
#16
Hung-Wei Yang, Ling Ye, Xin Dong Guo, Chinglai Yang, Richard W Compans, Mark R Prausnitz
Ebola DNA vaccine is incorporated into PLGA-PLL/γPGA nanoparticles and administered to skin using a microneedle (MN) patch. The nanoparticle delivery system increases vaccine thermostability and immunogenicity compared to free vaccine. Vaccination by MN patch produces stronger immune responses than intramuscular administration.
January 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28071597/three-dimensional-printing-of-a-microneedle-array-on-personalized-curved-surfaces-for-dual-pronged-treatment-of-trigger-finger
#17
Seng Han Lim, Jian Yao Ng, Lifeng Kang
The hand function of patients who suffer from trigger finger can be impaired by the use of traditional splints. There is also a risk of systemic side effects with oral non-steroidal anti-inflammatory drugs (NSAIDs) used for pain relief. Microneedle-assisted transdermal drug delivery offers an attractive alternative for local delivery of NSAIDs. However, traditional microneedle arrays fabricated on flat surfaces are unable to deliver drugs effectively across the undulating skin surface of affected finger(s)...
January 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28070698/drug-coated-microneedles-for-rapid-and-painless-local-anesthesia
#18
Sung-Hyun Baek, Ju-Hyung Shin, Yeu-Chun Kim
This study showed that drug-coated PLLA (Poly (L-lactide)) microneedle arrays can induce rapid and painless local anesthesia. Microneedle arrays were fabricated using a micro-molding technique, and the needle tips were coated with 290.6 ± 45.9 μg of lidocaine, the most widely used local anesthetic worldwide. A dip-coating device was newly designed for the coating step using an optimized coating formulation. Lidocaine coated on the arrays was released rapidly into PBS within 2 min, and its stability in storage lasted 3 weeks at 4, 25, and 37°C...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28068767/microneedle-assisted-skin-permeation-by-non-toxic-bioengineerable-gas-vesicle-nanoparticles
#19
Abhay U Andar, Ram Karan, Wolf T Pecher, Priya DasSarma, William D Hedrich, Audra L Stinchcomb, Shiladitya DasSarma
Gas vesicle nanoparticles (GVNPs) are hollow, buoyant protein organelles produced by the extremophilic microbe Halobacterium sp. NRC-1 and are being developed as bioengineerable and biocompatible antigen and drug-delivery systems (DDS). Dynamic light scattering measurements of purified GVNP suspensions showed a mean diameter of 245 nm. In vitro diffusion studies using Yucatan miniature pig skin showed GVNP permeation to be enhanced after MN-treatment compared to untreated skin. GVNPs were found to be non-toxic to mammalian cells (human kidney and rat mycocardial myoblasts)...
January 9, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28009691/treatment-of-acne-scars-on-darker-skin-types-using-a-noninsulated-smooth-motion-electronically-controlled-radiofrequency-microneedles-treatment-system
#20
David Pudukadan
BACKGROUND: Noninvasive technologies for treating acne scars use radiofrequency (RF)-emitting microneedles for both mechanical disruption of fibrotic strands and heat-mediated collagen remodeling. OBJECTIVE: Efficacy and safety evaluation of electronically controlled noninsulated RF microneedling system on acne scars in patients with dark skin. METHODS: Nineteen patients, 24 to 51 years old, skin types III to V, with acne scars were enrolled in the study...
January 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
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