TY - JOUR
T1 - Excited-State Proton Transfer of Weak Photoacids Adsorbed on Biomaterials
T2 - Proton Transfer on Starch
AU - Simkovitch, Ron
AU - Huppert, Dan
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/7/30
Y1 - 2015/7/30
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84938227396&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.5b04510
DO - 10.1021/acs.jpcb.5b04510
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AN - SCOPUS:84938227396
SN - 1520-6106
VL - 119
SP - 9795
EP - 9804
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 30
ER -