Table 2. Binding affinities of TiO₂ with different protein receptors, showing H-bonding interactions.

Receptors	Binding energy (kcal mol–1)	Binding residues	H-Bond length	Atoms involved (TiO2-receptor residues)
he1a	–3.39	Asn258	2.94	O1–OD1
sod1	–3.80	Val82	2.96	O2–N
		Asn66	2.38	O1–OD1
		Asn66	3.12	O2–OD1
apoa1a	–2.44	Leu84	2.73	O1–O
		Leu84	3.07	O2–O
		Thr85	2.89	O1O
tp53	–3.14	Arg314	2.80	O2–N
		Arg310	3.07	O2–O
		Arg310	3.14	O1–O
		Glu313	3.10	O1–OE1
		Glu302	2.96	O1–OE1