given that 0.45 µm syringe filters have been demonstrated to efficiently protect these type of columns [2], all the syringe filters used in this study had 0.45 µm membranes, and were 25 mm in diameter. Aijiren supplies Vials: Amber, write-on spot, 100/pk (p/n ) Vial caps: Blue, screw cap, 100/pk (p/n )