物理化学学报 >> 2007, Vol. 23 >> Issue (09): 1454-1458.doi: 10.3866/PKU.WHXB20070928

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厚朴酚在乙醇中的荧光自猝灭及猝灭机理

黎红梅; 陈亚东; 严拯宇; 胡育筑   

  1. 中国药科大学基础部, 南京 210038
  • 收稿日期:2007-01-25 修回日期:2007-03-19 发布日期:2007-09-06
  • 通讯作者: 胡育筑 E-mail:njhuyuzu@jlonline.com

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 E-mail:njhuyuzu@jlonline.com

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摘要：

系统研究了厚朴酚的荧光光谱和吸收光谱随浓度的变化, 揭示了厚朴酚具有较强的自猝灭特性. 其猝灭包括静态和动态机制: 随着浓度增加, 厚朴酚发生聚集; 同时, 单体和聚集体对荧光的猝灭表现为动态猝灭, 由单体、二聚体、三聚体造成的荧光猝灭速率常数kqm、k qd、k qt值远大于扩散控制的荧光猝灭速率常数. 说明除扩散控制的短程能量转移引起的猝灭外, 厚朴酚还存在长程能量转移导致的猝灭机制.

关键词: 厚朴酚; 荧光自猝灭; 聚集; 猝灭速率常数

Abstract:

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