Table 1.

Results of quantitative amino acid analysis on collagen-tethered PEG/PAA hydrogels (in total micrograms).

Residue	Reaction 1*	Reaction 2**	Reaction 3***
Asx	3.18 ± 1.01	2.62 ± 0.26	2.37 ± 0.39
Thr	1.36 ± 0.50	1.10 ± 0.10	0.97 ± 0.15
Ser	1.73 ± 0.55	1.40 ± 0.14	1.28 ± 0.19
Glx	8.56 ± 2.75	7.58 ± 0.80	6.90 ± 1.13
Pro	7.62 ± 2.34	6.18 ± 0.74	5.64 ± 0.97
Gly	11.78 ± 3.06	9.75 ± 1.10	8.92 ± 1.48
Ala	4.84 ± 1.47	3.96 ± 0.44	3.60 ± 0.60
Val	1.55 ± 0.50	1.09 ± 0.12	0.93 ± 0.15
Ile	0.90 ± 0.29	0.69 ± 0.06	0.60 ± 0.10
Leu	1.80 ± 0.58	1.38 ± 0.14	1.17 ± 0.19
Tyr	0.18 ± 0.06	0.13 ± 0.01	0.11 ± 0.01
Phe	0.96 ± 0.32	0.77 ± 0.09	0.70 ± 0.12
His	0.52 ± 0.17	0.34 ± 0.04	0.29 ± 0.05
Lys	1.97 ± 0.63	1.70 ± 0.17	1.57 ± 0.25
Arg	4.97 ± 1.62	3.89 ± 0.47	3.52 ± 0.59
Hy Pro	6.80 ± 1.99	5.91 ± 0.71	5.51 ± 0.96
Hy Lys	0.78 ± 0.12	0.63 ± 0.06	0.55 ± 0.09
Total	59.50 ± 17.94	49.13 ± 5.46	44.63 ± 7.42

^*Reaction 1 involved incubation of the hydrogels with 0.03% w/v collagen type I

^**Reaction 2 involved incubation of the hydrogels with 0.1% w/v collagen type I

^***Reaction 3 involved incubation of the hydrogels with 0.3% w/v collagen type I