It is well known that β-cyclodextrin (β-CD) is a cyclic oligosaccharide
consisting of 7 β (1–4)-glucopyranose units. The internal
cavity is lined with C(3)H and C(5)H hydrogen and ether-like
oxygen that provide a hydrophobic environment, whereas the
external faces of the cyclodextrin molecule are hydrophilic. Due to
its ability to encapsulate hydrophobic compounds, this internal
cavity of β-CD allows hydrophobic cholesterol molecules to be
soluble in aqueous solutions (Pitha et al., 1988; López et al., 2011).
β-CDs have a high affinity for sterols as compared to other lipids
in vitro (Irie et al., 1992; Ohtani et al., 1989), which make these
compounds quite effective in modifying cholesterol metabolism.
Mondal and Jana (2012) have recently carried out fluorescent
detection of cholesterol using same Graphene-β-CD hybrid system,
where the optical detection of cholesterol was carried out using
Rhodamin 6G (R6G) dye as a fluorophore. But, to achieve higher
detection sensitivity along with lower detection limit and reproducibility,
electrochemical sensor delivers more authentic results
than optical.