Effect of soaking in acetone and heating conditions on yield and properties of hydrocolloids extracted from Gracilaria sp. and Solieria robusta
2011
Jukkarin Treeinthong(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fishery Products) | Jiraporn Runglerdkriangkrai(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fishery Products)
Effect of soaking seaweed in acetone before extraction of hydrocolloids and heating conditions during extraction by incubating in water bath at 80 deg C for 2 h (WB-80) or autoclaving at 121deg C for 30 min (AC-121) on yield and properties of agar from dried Gracilaria sp. and carrageenan from fresh Solieria robusta were studied. Agar powder extracted from acetone soaked Gracilaria sp. was slightly increased in lightness (L*) and redness (a*). Agar extracted from AC-121 had higher (p LT 0.05) yield, viscosity, emulsion activity and lower (p LT 0.05) 3,6-AG content than that from WB-80. Green color of fresh Solieria robusta was removed after soaking in acetone resulting in the increase of a* as well as L* and yellowness (b*) of carrageenan powder. Carrageenan powder extracted from WB-80 had higher (p LT 0.05) viscosity, emulsion activity, emulsion stability index and lower (p LT 0.05) sulfate content than that from AC-121. However, both heating conditions had no significant effect on gel strength of agar (265.85-279.20 g/square cm) and carrageenan (7.81-8.38 g/square cm) (p GT 0.05).
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