Osmosis-Powered Hydrogel Microneedles for Microliters of Skin Interstitial Fluid Extraction within Minutes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Mengjia Zheng
  • Zifeng Wang
  • Hao Chang
  • Lulu Wang
  • Sharon W. T. Chew
  • Daniel Chin Shiuan Lio
  • Mingyue Cui
  • Linbo Liu
  • Benjamin C. K. Tee

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article numberARTN 1901683
Number of pages11
Journal / PublicationAdvanced Healthcare Materials
Volume9
Issue number10
Online published30 Apr 2020
Publication statusPublished - May 2020

Abstract

Hydrogel microneedle patch enables the extraction of skin interstitial fluid (ISF) through in situ swelling in a minimally invasive manner without assistance of mechano-chemical peripherals. However, existing hydrogel microneedles require tens of minutes with multistep process to collect sufficient volume (1 mL) for effective analysis. This study introduces an osmolyte-powered hydrogel microneedle patch that can extract ISF three times faster than the existing platforms and provide in situ analysis of extracted biomarkers. The microneedle patch is composed of osmolytes (i.e., maltose) and hydrogel (i.e., methacrylated hyaluronic acid). During the extraction process, the osmolytes dissolve in the matrix and provide the osmotic pressure that increases the diffusion of ISF from skin to the hydrogel matrix. A patch with 100 microneedles can extract 7.90 μL of ISF from pig skin ex vivo and 3.82 μL of ISF from mouse skin in vivo within 3 min, whereas the control (i.e., hydrogel microneedle without osmolytes) requires >10 min to achieve similar results. The extracted ISF allows the quantification of biomarkers such as glucose and/or drugs such as insulin in vivo. Through the integration with the electronic glucose sensors, the whole system permits the direct and rapid analysis of the extracted glucose.

Research Area(s)

  • microneedles, osmolyte, osmosis, skin interstitial fluid, swellable materials

Citation Format(s)

Osmosis-Powered Hydrogel Microneedles for Microliters of Skin Interstitial Fluid Extraction within Minutes. / Zheng, Mengjia; Wang, Zifeng; Chang, Hao; Wang, Lulu; Chew, Sharon W. T.; Lio, Daniel Chin Shiuan; Cui, Mingyue; Liu, Linbo; Tee, Benjamin C. K.; Xu, Chenjie.

In: Advanced Healthcare Materials, Vol. 9, No. 10, ARTN 1901683, 05.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review