The sol-gel transition of gellan gum aqueous solutions in the presence of various metal salts
Gellan gum undergoes gelation by forming domains composed of associated double helices. Gellan gum aqueous solutions were prepared with or without adding various metal salts, and their gel-sol transitions were observed by small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC). The SAXS results are analyzed in terms of the molecular models of associated double helices, and the DSC endo-thermic peaks are attributed to the possible dissociation processes of the domains formed upon gelation. The mechanism of the gel-sol transition is discussed from the view point of the role of metal cations.
Key wordsSmall-angle X-ray scattering Gellan gum Gel structure Differential scanning calorimetry
Unable to display preview. Download preview PDF.
- 2.Crescenzi V, Dentini M, Dea ICM (1986) Carbohydr Res 114: 181–191Google Scholar
- 4.Yuguchi Y, Urakawa H, Kajiwara K (1997) Macromol Symp 120: 77–89Google Scholar
- 9.Annaka M, Honda J, Seki H, Nakahira T, Yokita M, Miyamoto K, Komai T (1998) Proceedings of the 4th International Conference on Hydrocolloids. Osaka Japan p 106Google Scholar
- 10.Tsutsumi A, Ozawa T, Okada M, Hiraoka T (1998) Proceedings of the 4th International Conference on Hydrocolloids. Osaka Japan p 110Google Scholar
- 11.Kratky O, Glatter O (eds) (1982) Small-angle X-ray scattering. Academic Press, LondonGoogle Scholar
- 12.Shimode M, Mimura M, Urakawa H, Yamanaka S, Kajiwara K (1996) Sen’i Gakkaishi 52: 301–309Google Scholar
- 13.Guenet J-M (1992) Thermoreversible gelation of polymers and biopolymers. Academic Press, LondonGoogle Scholar