Preparation and Characterization of Na-Alginate Hydrogel Beads

Year 2019, Volume: 6 , 32 - 38, 25.07.2019

Mehlika Pulat Duygu Ozukaya

Abstract

A series of Na Alginate (Na-Alg) hydrogel beads were prepared by using
ionic cross linking method. The beads were obtained by dropping of Na-Alg
solution in chilled oil bath at -18 ºC first and then leaving the hardened
beads into the cross linker solution. CaCl2 solution was used for ionic cross
linking of Na-Alg molecules. While the concentration of Na-Alg solution was
kept constant, crosslinking time was changed from 5 to 30 minutes. In general,
longer crosslinking times negatively affect hydrogel formation. Swelling
behaviors of the hydrogels were studied by changing time, temperature and pH.
The higher crosslinker / polymer rates caused lower swelling values. It was
determined that the swelling percentages regularly decreased with increasing
the crossliking time. While the time increased from 5 to 30 minute, swelling
percentages decreased from 158 % to 33 %. Temperature changing negligibly
affects the swelling percentages. The prepared Na-Alg  hydrogels could not be commended as
temperature sensitive.

Keywords

Hydrogel , Na-Alginate , CaCl2 , Swelling

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