alginate (PRONOVA UP LVM) was purchased
from NovaMatrix (Norway). All lipids were purchased from Avanti Polar
Lipids, Inc. (Alabaster, AL, USA). Ethylenediamine tetra-acetic acid
disodium salt dihydrate (Na2EDTA) and calcium chloride
anhydrous were purchased from Sinopharm Chemical Reagent Co., Ltd.
(Shanghai, China). Sodium chloride was purchased from Dieckmann (China).
Mineral oil and trichloro(1H,1H,2H,2H-perfluoro-octyl) silane were
purchased from Sigma (Sigma-Aldrich, Milwaukee, WI). Negative photoresist
SU-8 2050 and SU8 developer were obtained from Chestech (Rugby, UK).
Polydimethylsiloxane (PDMS) prepolymer and the curing agent (Sylgard
184) were obtained from Dow Corning (Midland, MI, USA). Sephadex G50
columns were purchased from GE Healthcare Life Sciences (Pittsburgh,
PA). Dulbecco’s Minimum Essential Medium (DMEM, GlutaMAXTM-1)
and DMEM-HG medium were purchased from Gibco, Invitrogen.