Clinical microneedle injection of methyl nicotinate: Stratum corneum penetration

Raja K Sivamani, Boris Stoeber, Gabriel C. Wu, Hongbo Zhai, Dorian Liepmann, Howard Maibach

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

Background/purpose: In recent years, microneedles were proposed as a method to painlessly deliver drugs past the stratum corneum. Microneedles have been fabricated in several designs, but limited studies have tested microneedle injections in humans. In this work, we compare microneedle injections with topical application (TA) to investigate if microneedles enhance in vivo drug delivery past the stratum corneum. Method: In vitro tests were used to measure microneedle pressures and injection volumes. In vivo microneedle injections were performed on the volar forearm of 11 healthy volunteers. Two sets of microneedles, pointed and symmetric, were used to develop microneedle/syringe apparatuses that were used to inject approximately 1 μL of 0.1 M methyl nicotinate, and were compared against TA. A Laser Doppler Perfusion Monitor was used to record maximum blood flow and the time to maximum blood flow at the treatment sites. Results: Pointed and symmetric microneedle-injected sites showed a significantly faster time to maximum blood flow than TA. The pointed microneedle injections also resulted in a higher maximum blood flux. Volunteers reported feeling pressure but no pain from the microneedles during the injections. Conclusion: The microneedles aid in bypassing the stratum corneum and enhance drug delivery through it. The design of the microneedle influences its delivery capabilities, because the pointed microneedles seem to be less susceptible to clogging during the injection.

Original languageEnglish (US)
Pages (from-to)152-156
Number of pages5
JournalSkin Research and Technology
Volume11
Issue number2
DOIs
StatePublished - May 2005

Fingerprint

Cornea
Blood
Injections
Drug delivery
Syringes
Pharmaceutical Preparations
Pressure
Fluxes
methyl nicotinate
Lasers
Forearm
Volunteers
Healthy Volunteers
Emotions
Perfusion
Pain

Keywords

  • Clinical
  • In vivo
  • Microneedle
  • Nicotinate
  • Skin

ASJC Scopus subject areas

  • Dermatology
  • Biomedical Engineering
  • Biotechnology
  • Clinical Biochemistry
  • Computer Science (miscellaneous)

Cite this

Clinical microneedle injection of methyl nicotinate : Stratum corneum penetration. / Sivamani, Raja K; Stoeber, Boris; Wu, Gabriel C.; Zhai, Hongbo; Liepmann, Dorian; Maibach, Howard.

In: Skin Research and Technology, Vol. 11, No. 2, 05.2005, p. 152-156.

Research output: Contribution to journalArticle

Sivamani, Raja K ; Stoeber, Boris ; Wu, Gabriel C. ; Zhai, Hongbo ; Liepmann, Dorian ; Maibach, Howard. / Clinical microneedle injection of methyl nicotinate : Stratum corneum penetration. In: Skin Research and Technology. 2005 ; Vol. 11, No. 2. pp. 152-156.
@article{472906af87f2483cb24f4dc89307b28f,
title = "Clinical microneedle injection of methyl nicotinate: Stratum corneum penetration",
abstract = "Background/purpose: In recent years, microneedles were proposed as a method to painlessly deliver drugs past the stratum corneum. Microneedles have been fabricated in several designs, but limited studies have tested microneedle injections in humans. In this work, we compare microneedle injections with topical application (TA) to investigate if microneedles enhance in vivo drug delivery past the stratum corneum. Method: In vitro tests were used to measure microneedle pressures and injection volumes. In vivo microneedle injections were performed on the volar forearm of 11 healthy volunteers. Two sets of microneedles, pointed and symmetric, were used to develop microneedle/syringe apparatuses that were used to inject approximately 1 μL of 0.1 M methyl nicotinate, and were compared against TA. A Laser Doppler Perfusion Monitor was used to record maximum blood flow and the time to maximum blood flow at the treatment sites. Results: Pointed and symmetric microneedle-injected sites showed a significantly faster time to maximum blood flow than TA. The pointed microneedle injections also resulted in a higher maximum blood flux. Volunteers reported feeling pressure but no pain from the microneedles during the injections. Conclusion: The microneedles aid in bypassing the stratum corneum and enhance drug delivery through it. The design of the microneedle influences its delivery capabilities, because the pointed microneedles seem to be less susceptible to clogging during the injection.",
keywords = "Clinical, In vivo, Microneedle, Nicotinate, Skin",
author = "Sivamani, {Raja K} and Boris Stoeber and Wu, {Gabriel C.} and Hongbo Zhai and Dorian Liepmann and Howard Maibach",
year = "2005",
month = "5",
doi = "10.1111/j.1600-0846.2005.00107.x",
language = "English (US)",
volume = "11",
pages = "152--156",
journal = "Skin Research and Technology",
issn = "0909-752X",
publisher = "Wiley-Blackwell",
number = "2",

}

TY - JOUR

T1 - Clinical microneedle injection of methyl nicotinate

T2 - Stratum corneum penetration

AU - Sivamani, Raja K

AU - Stoeber, Boris

AU - Wu, Gabriel C.

AU - Zhai, Hongbo

AU - Liepmann, Dorian

AU - Maibach, Howard

PY - 2005/5

Y1 - 2005/5

N2 - Background/purpose: In recent years, microneedles were proposed as a method to painlessly deliver drugs past the stratum corneum. Microneedles have been fabricated in several designs, but limited studies have tested microneedle injections in humans. In this work, we compare microneedle injections with topical application (TA) to investigate if microneedles enhance in vivo drug delivery past the stratum corneum. Method: In vitro tests were used to measure microneedle pressures and injection volumes. In vivo microneedle injections were performed on the volar forearm of 11 healthy volunteers. Two sets of microneedles, pointed and symmetric, were used to develop microneedle/syringe apparatuses that were used to inject approximately 1 μL of 0.1 M methyl nicotinate, and were compared against TA. A Laser Doppler Perfusion Monitor was used to record maximum blood flow and the time to maximum blood flow at the treatment sites. Results: Pointed and symmetric microneedle-injected sites showed a significantly faster time to maximum blood flow than TA. The pointed microneedle injections also resulted in a higher maximum blood flux. Volunteers reported feeling pressure but no pain from the microneedles during the injections. Conclusion: The microneedles aid in bypassing the stratum corneum and enhance drug delivery through it. The design of the microneedle influences its delivery capabilities, because the pointed microneedles seem to be less susceptible to clogging during the injection.

AB - Background/purpose: In recent years, microneedles were proposed as a method to painlessly deliver drugs past the stratum corneum. Microneedles have been fabricated in several designs, but limited studies have tested microneedle injections in humans. In this work, we compare microneedle injections with topical application (TA) to investigate if microneedles enhance in vivo drug delivery past the stratum corneum. Method: In vitro tests were used to measure microneedle pressures and injection volumes. In vivo microneedle injections were performed on the volar forearm of 11 healthy volunteers. Two sets of microneedles, pointed and symmetric, were used to develop microneedle/syringe apparatuses that were used to inject approximately 1 μL of 0.1 M methyl nicotinate, and were compared against TA. A Laser Doppler Perfusion Monitor was used to record maximum blood flow and the time to maximum blood flow at the treatment sites. Results: Pointed and symmetric microneedle-injected sites showed a significantly faster time to maximum blood flow than TA. The pointed microneedle injections also resulted in a higher maximum blood flux. Volunteers reported feeling pressure but no pain from the microneedles during the injections. Conclusion: The microneedles aid in bypassing the stratum corneum and enhance drug delivery through it. The design of the microneedle influences its delivery capabilities, because the pointed microneedles seem to be less susceptible to clogging during the injection.

KW - Clinical

KW - In vivo

KW - Microneedle

KW - Nicotinate

KW - Skin

UR - http://www.scopus.com/inward/record.url?scp=17444403584&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17444403584&partnerID=8YFLogxK

U2 - 10.1111/j.1600-0846.2005.00107.x

DO - 10.1111/j.1600-0846.2005.00107.x

M3 - Article

C2 - 15807814

AN - SCOPUS:17444403584

VL - 11

SP - 152

EP - 156

JO - Skin Research and Technology

JF - Skin Research and Technology

SN - 0909-752X

IS - 2

ER -