Table 2.

Relative absorption intensity (Rel. Abs) of AuNPs₁₅/PEG_3k in freezing, lyophilization, heating, and physiological condition tests.

Test	No PEG	HO–PEG–OH	MeO–PEG–OMe	HS–PEG–OMe	c-PEG
Freezing	3%	26%	21%	92%	97%
Lyophilization	3%	9%	5%	84%	91%
Heating	39%	78%	12%	13%	95%
Physiological condition	1%	1%	2%	83%	88%

Rel. Abs was calculated by dividing the absorption value at λ_max after the tests by that before the tests.