Immobilization of enzymes within hydrogel microparticles to create optical biosensors for the detection of organophosphorus compounds

Bumsang Kim, Youngsik Lee, Kangtaek Lee, Won-Gun Koh

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

As a first step in the development of an optical biosensor for the detection of organophosphorus compounds, we describe the immobilization of conjugates of enzyme (AChE) and pH-sensitive fluorophore (SNAFL-1) within the PEG hydrogel microparticles via a dispersion photopolymerization. The fluorescent response of the PEG microparticles containing AChE-SNAFL conjugates showed that AChE-SNAFL conjugates were successfully encapsulated within the microparticles and that AChE was still active after the encapsulation procedure. Using a quantitative analysis of enzyme activity, we found that 70% of AChE activity was maintained after conjugation and encapsulation. A leaching test showed that there was no significant AChE leaching into the surrounding media. These results indicate that AChE-SNAFL conjugates could be encapsulated within PEG hydrogel microparticles without a significant loss of the enzyme activity and that these microparticles could potentially be used as optical biosensors for the detection of organophosphorus compounds.

Original languageEnglish
JournalCurrent Applied Physics
Volume9
Issue number4 SUPPL.
DOIs
Publication statusPublished - 2009 Jul 1

Fingerprint

Organophosphorus Compounds
Hydrogel
microparticles
immobilization
bioinstrumentation
Biosensors
Hydrogels
Polyethylene glycols
enzymes
Enzymes
Enzyme activity
Encapsulation
Leaching
enzyme activity
leaching
Fluorophores
Photopolymerization
conjugation
quantitative analysis
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "As a first step in the development of an optical biosensor for the detection of organophosphorus compounds, we describe the immobilization of conjugates of enzyme (AChE) and pH-sensitive fluorophore (SNAFL-1) within the PEG hydrogel microparticles via a dispersion photopolymerization. The fluorescent response of the PEG microparticles containing AChE-SNAFL conjugates showed that AChE-SNAFL conjugates were successfully encapsulated within the microparticles and that AChE was still active after the encapsulation procedure. Using a quantitative analysis of enzyme activity, we found that 70{\%} of AChE activity was maintained after conjugation and encapsulation. A leaching test showed that there was no significant AChE leaching into the surrounding media. These results indicate that AChE-SNAFL conjugates could be encapsulated within PEG hydrogel microparticles without a significant loss of the enzyme activity and that these microparticles could potentially be used as optical biosensors for the detection of organophosphorus compounds.",
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AU - Lee, Youngsik

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N2 - As a first step in the development of an optical biosensor for the detection of organophosphorus compounds, we describe the immobilization of conjugates of enzyme (AChE) and pH-sensitive fluorophore (SNAFL-1) within the PEG hydrogel microparticles via a dispersion photopolymerization. The fluorescent response of the PEG microparticles containing AChE-SNAFL conjugates showed that AChE-SNAFL conjugates were successfully encapsulated within the microparticles and that AChE was still active after the encapsulation procedure. Using a quantitative analysis of enzyme activity, we found that 70% of AChE activity was maintained after conjugation and encapsulation. A leaching test showed that there was no significant AChE leaching into the surrounding media. These results indicate that AChE-SNAFL conjugates could be encapsulated within PEG hydrogel microparticles without a significant loss of the enzyme activity and that these microparticles could potentially be used as optical biosensors for the detection of organophosphorus compounds.

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