Excited-State Proton Transfer of Weak Photoacids Adsorbed on Biomaterials: Proton Transfer on Starch

Ron Simkovitch, Dan Huppert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Steady-state and time-resolved fluorescence techniques were employed to study the excited-state proton transfer (ESPT) from a photoacid adsorbed on starch to a nearby water molecule. Starch is composed of ∼30% amylose and ∼70% amylopectin. We found that the ESPT rate of adsorbed 8-hydroxy-1,3,6-pyrenetrisulfonate (HPTS) on starch arises from two time constants of 300 ps and ∼3 ns. We explain these results by assigning the two different ESPT rates to HPTS adsorbed on amylose and on amylopectin. When adsorbed on amylose, the ESPT rate is ∼3 × 109s-1, whereas on amylopectin, it is only ∼3 × 108 s-1.

Original languageEnglish
Pages (from-to)9795-9804
Number of pages10
JournalJournal of Physical Chemistry B
Volume119
Issue number30
DOIs
StatePublished - 30 Jul 2015

Funding

FundersFunder number
Israel Science Foundation

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