The detail of various monohydric alcohols used to induce the physical crosslinking in silk fibroin solution.

Sample name	Alcohol solution	Number of carbon chain	Ratio of alcohol polarity	Polarity (ENT)
F	—	—	—	—
FM	Methanol	1	1.00 (1 : 1)	0.762 (ref. 9)
FE	Ethanol	2	0.50 (1 : 2)	0.654 (ref. 9)
FP	n-Propanol	3	0.33 (1 : 3)	0.617 (ref. 9)
FB	n-Butanol	4	0.25 (1 : 4)	0.586 (ref. 9)