Table 1 Optimization of oxygen tolerant photoinduced ATRP grafting of styrene from BSA-Br.

Entry	M_n/I_o/Cu^II/L	Cu^II ppm	% OC	Rxn time min	λ_max nm	BSA-Br (I_o) consumption
1	5000/1/1.5/12	22	18^a	180	365	Quantitative
2	5000/1/1.5/12	22	13^b	180	365	Quantitative
3	5000/1/1.5/12	22	18^a	n/a	460	Quantitative
4	2000/1/1.5/12	22	11^a	n/a	365	Quantitative
5	2000/1/1.5/12	22	5^b	300	365	Quantitative
6	500/1/1.5/12	22	1^b	480	365	Partial reaction
7	50/1/1.5/12	22	0.1^b	480	365	No or partial reaction
8	5000/0/1.5/12	22	18^b	n/a	365	No reaction
9	5000/1/1.5/12	22	18^b	480	dark	No reaction
10	5000/1/0/0	22	18^b	480	365	No reaction

M_n monomer (styrene), I_o Initiator (BSA-Br), L ligand (Me₆TREN), OC organic content, Rxn time reaction time.
^aReactions in 20 mM phosphate buffer pH 7.4 with DMSO as cosolvent.
^bReactions in 20 mM phosphate buffer pH 7.4 without organic cosolvent.

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