. Author manuscript; available in PMC: 2021 Jan 1.

Published in final edited form as: Int J Polym Mater. 2019 Aug 26;69(16):1054–1068. doi: 10.1080/00914037.2019.1655750

Table 2.

Midpoint transition temperature (Tm) and transition enthalpy (ΔH) of insulin, zinc-insulin hexamers and chitosan-zinc-insulin complexes prepared using different chain lengths of chitosan, in phosphate buffered saline at pH 7.4. Data are expressed as mean ± S.D, n = 3.

Sample	Tm₁ (°C)	Tm₂ (°C)	ΔH (kJ/mol)
Insulin	51.92 ± 0.21	63.20 ± 0.10	99.21 ± 0.34
Zinc-Insulin hexamers	73.63 ± 0.23	-	345.45 ± 0.51
CS (5 kDa) –Zinc-Insulin complex	86.73 ± 0.07	-	572.88 ± 4.33
CS (30 kDa) –Zinc-Insulin complex	87.69 ± 0.06	-	704.03 ± 1.12
CS (50 kDa) –Zinc-Insulin complex	88.36 ± 0.10	-	727.90 ± 0.97
CS (200 kDa) –Zinc-Insulin complex	89.04 ± 0.13	-	954.75 ± 3.69