Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (09): 1454-1458.doi: 10.3866/PKU.WHXB20070928

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Fluorescence Self-quenching and the Quenching Mechanism of Magnolol

LI Hong-Mei; CHEN Ya-Dong; YAN Zheng-Yu; HU Yu-Zhu   

  1. Basic Science School, China Pharmaceutical University, Nanjing 210038, P. R. China
  • Received:2007-01-25 Revised:2007-03-19 Published:2007-09-06
  • Contact: HU Yu-Zhu


The absorption and emission spectra of magnolol in ethanol were determined, and the fluorescence self-quenching characteristics, including static-quenching and dynamic-quenching, were revealed. Magnolol aggregation occurs with its concentration increases. On the other hand, the quenching rate constants produced by the monomer, dimmer, and trimer, kqm, kqd, and kqt, are much greater than those controlled by diffusion. It seems that other long-range energy migration should be taken into account besides the short-range electron exchange energy in the quenching mechanism.

Key words: Magnolol; Fluorescence self-quenching; Aggregation; Quenching rate


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