purchased from Molekula (Munich, Germany).
Propanal, butanal, trans-2-hexenal, octanal, decanal,
and undecylenic aldehyde were purchased from Acros Organics (Geel,
Belgium). Hexanal, dodecanal, acetic acid, and pyrene were purchased
from Sigma-Aldrich (Steinheim, Germany). Double deionized water (DDW)
was obtained by mechanically filtering them through a Treion TS1173
column. Hexane and toluene were purchased from Bio-lab (Ashkelon,
Israel). Deuterated solvents for NMR analysis (D2O, AcOH-d4) were purchased from Armar Chemicals (Döttingen,
Switzerland). Gas chromatography gases (helium, compressed air, nitrogen,
and hydrogen) were purchased from Gordon Gas and Chemicals (Tel Aviv,
Israel) at a 99.999% grade. All the reagents, solvents, and gases
were used without further purification.