A colorimetric alginate-catechol hydrogel suitable as a spreadable pH indicator

Yu Kyoung Lee, Sang Yup Lee

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


A pH-sensitive colorimetric hydrogel was prepared from a catechol-conjugated alginate hydrogel and a pyrocatechol violet dye. The alginate-catechol hydrogel functioned as a host matrix, holding the dye solution inside, while the entrapped pyrocatechol violet worked as a pH-indicating dye whose color changed reversibly by responding to external pH stimuli. Compared to the other commonly used hydrogels, the alginate-catechol hydrogel provided high mechanical strength and chemical stability without deformation over a wide range of pH values because of the internal cross-linking of the catechol groups. Furthermore, it conferred considerable adhesion strength to various substrates via the adhesive function of the catechol moiety. The usage of the hydrogel as a spreadable pH indicator was demonstrated on a variety of surfaces. Finally, the colorimetric hydrogel was implanted in a fluidic channel to function as a visible pH indicator.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalDyes and Pigments
Publication statusPublished - 2014 Sept

Bibliographical note

Funding Information:
This work was supported by a grant from the Korean Research Foundation funded by the Korean Government ( NRF-2013R1A1A2006459 ).

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Process Chemistry and Technology


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