The duration of the treatment and the concentration
used were adjusted for every PE. All the PEs were
dissolved in water (except for PA in PBS), with the
concentrations (all w/w) of 40% for UR (for 3d), 5% for
TA (for 15h) and 2% for PA (for 15h). A combination of
UR and TA (for 15h) as well as a serial treatment (UR
for 3d + TA 15h) was also examined. The cells were
kept at room temperature during treatments; except
for PA (32 °C). After treatments, both compartments
were then rinsed twice with double distilled water and
PBS.
Receivers were filled with PBS and donors with marker
solutions in PBS (SF 500 µg/mL, FD4 1000 µg/mL and
RB 250 µg/mL). Samples (100 µL) were taken from the
receivers for 7-30h and replaced by the same amount
of fresh buffer. The fluorescence intensities of the
samples were analysed using fluorescence plate reader
(Tecan, Switzerland) with λ excitation at 485 nm, λ
emission at 535 nm filters for SF and FD4; λ excitation
at 535 nm, λ emission at 590 nm for RB. 
 
The duration of the treatment and the concentrationused were adjusted for every PE. All the PEs weredissolved in water (except for PA in PBS), with theconcentrations (all w/w) of 40% for UR (for 3d), 5% forTA (for 15h) and 2% for PA (for 15h). A combination ofUR and TA (for 15h) as well as a serial treatment (URfor 3d + TA 15h) was also examined. The cells werekept at room temperature during treatments; exceptfor PA (32 °C). After treatments, both compartmentswere then rinsed twice with double distilled water andPBS.Receivers were filled with PBS and donors with markersolutions in PBS (SF 500 µg/mL, FD4 1000 µg/mL andRB 250 µg/mL). Samples (100 µL) were taken from thereceivers for 7-30h and replaced by the same amountof fresh buffer. The fluorescence intensities of thesamples were analysed using fluorescence plate reader(Tecan, Switzerland) with λ excitation at 485 nm, λemission at 535 nm filters for SF and FD4; λ excitationat 535 nm, λ emission at 590 nm for RB. 
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