Fluorescence Spectrum Study of Sol-gel Transition in Alginate Aqueous Solutions Induced by Calcium Cations

Chem. J. Chinese Universities

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Fluorescence Spectrum Study of Sol-gel Transition in Alginate Aqueous Solutions Induced by Calcium Cations

LU Lu¹, LIU Xin-Xing², TONG Zhen²*

1. Department of Materials Science and Engineering, Jinan University, Guangzhou 510632, China;
2. Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China

Received:2007-10-19 Revised:1900-01-01 Online:2008-05-10 Published:2008-05-10
Contact: TONG Zhen

Abstract

Abstract: In order to establish an experiment method to determine the gelation point for the physical gelation without disturbing the system mechanically, the fluorescence spectrum was used to monitor the sol-gel transition in the aqueous solutions of FITC labeled alginate induced by Ca²⁺. The slope change was found from the curves of the emission strength and fluorescence anisotropy against gelation time, indicating the gelation time of 80 min, which just equaled that determined by rheology measurement. The label fluorescence strength and anisotropy can be used to determine the gel point for the physical gelation.

Key words: Sol-gel transition, Physical gelation, Fluorescence spectrum, Alginate

CLC Number:

O631
O648

TrendMD:

LU Lu¹, LIU Xin-Xing², TONG Zhen²*. Fluorescence Spectrum Study of Sol-gel Transition in Alginate Aqueous Solutions Induced by Calcium Cations[J]. Chem. J. Chinese Universities, doi: .

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Fluorescence Spectrum Study of Sol-gel Transition in Alginate Aqueous Solutions Induced by Calcium Cations

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