Preparation and characterization of pH-responsive poly(N,N-dimethyl acrylamide-co-methacryloyl sulfadimethoxine) hydrogels for application as food freshness indicators

Seunghye Baek, Dowan Kim, Sung Lan Jeon, Jongchul Seo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A series of poly(N,N-dimethyl acrylamide-co-methacryloyl sulfadimethoxine) (poly(DMA-co-SDM)) hydrogels with different ratios of N,N-dimethylacrylamide (DMA) and methacryloyl sulfadimethoxine monomer (SDM) were synthesized by free radical polymerization. The pKa values of the monomer and hydrogels were measured to investigate the extent to which their pH-responsive properties were affected by the ionizable sulfonamide groups. Further, buffer solutions of pH 2.0–10.0, considered as the spoilage metabolites, were used to confirm the change in the pH-responsive properties. The composition ratios of DMA and SDM strongly affected the pKa values of the hydrogels, contributing to differences in the ionization around their pKa values. As a result, all the hydrogels showed different changes in their appearance, from opaque to transparent or vice versa at certain pH values. The change in the transparency of the as-prepared hydrogels is strongly dependent on both the change in the pH and the amount of buffer solution, which mainly occurs owing to the change in the quality of a product with time. Therefore, the synthesized pH-responsive poly(DMA-co-SDM) hydrogels can be potentially applied as transparency changing indicators in response to metabolites released owing to the change in the quality of the food products.

Original languageEnglish
Pages (from-to)57-65
Number of pages9
JournalReactive and Functional Polymers
Volume120
DOIs
Publication statusPublished - 2017 Nov

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Biochemistry
  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

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