Biomembrane-Compatible Sol–Gel-Derived Photocatalytic
Titanium Dioxide
Version 2 2017-10-20, 13:53
Version 1 2017-10-08, 16:13
Posted on 2017-10-20 - 13:53
Titanium dioxide
gel monoliths were synthesized using an organic precursor and 0–30
vol % ethanol in water. The visible-light-activated proton pump, bacteriorhodopsin,
in its native purple membrane form, was successfully encapsulated
within the titanium dioxide gels. Absorption spectra showed that the
folded functional state of the protein remained intact within gels
made with 0 and 15 vol % ethanol and retained the ability to make
reversible conformational changes associated with the photocycle within
the gel made with 0 vol % ethanol. The photocatalytic activity of
gels made with no ethanol was significantly detectable and gels made
with 0–30 vol % ethanol were comparable to commercial crystalline
nanoparticles in similar solution conditions when irradiated with
UV light. Our results show that sol–gel-derived photocatalytic
titanium dioxide can be made biocompatible for a membrane-associated
protein by minimizing the amount of ethanol and maximizing the amount
of water in the synthesis procedure. The entrapment of the membrane
protein, bacteriorhodopsin, in sol–gel-derived titanium dioxide
provides the first step in future explorations of this bionanocomposite
for visible light photocatalysis, including hydrogen production.
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Johnson, Kaitlin E.; Gakhar, Sukriti; Deng, Yue; Fong, Keiko; Risbud, Subhash H.; Longo, Marjorie L. (2017). Biomembrane-Compatible Sol–Gel-Derived Photocatalytic
Titanium Dioxide. ACS Publications. Collection. https://doi.org/10.1021/acsami.7b12673
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AUTHORS (6)
KJ
Kaitlin E. Johnson
SG
Sukriti Gakhar
YD
Yue Deng
KF
Keiko Fong
SR
Subhash H. Risbud
ML
Marjorie L. Longo