| 光谱学与光谱分析 |
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| Identification of Protoporphyrin IX Fluorescence Spectrum in Human Blood Serum by Biorthogonal Spline Wavelet |
| ZHU Dian-ming1,2,JIN Wan-xiang1,LUO Xiao-sen2,LIU Ying2,SHEN Zhong-hua2,LU Jian2,NI Xiao-wu2* |
1.Department of Physics, Xuzhou Institute of Industry Technology, Xuzhou 221006, China
2.School of Science, Nanjing University of Science & Technology, Nanjing 210094, China |
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Abstract For the low content and weak fluorescence intensity, usually presenting shoulder peaks, it is often hard to locate protoporphyrin IX and identify its fluorescence intensity in human blood serum.Biorthogonal spline wavelet may work for the identification of its weak signal.Superimposing protoporphyrin IX fluorescence signal on the background of blood serum spectrum, a series of varied fluorescence spectra of them can be obtained.The protoporphyrin IX fluorescence signal from blood serum background is separated and the fluorescence spectrum can be divided into corresponding discrete approximate signals (a1-a7) and discrete details signals (d1-d7) by biorthogonal spline wavelet bior 5.5 seven levels decomposition.The signal frequency shows a gradual decrease with increasing decomposition.Protoporphyrin IX fluorescence peak emerges when it comes to the 7th decomposition.The signal peak shifts about 2.5 mm downwards as the signal intensity decreases, whereas the signal peak from wavelet filter remains where it was.As the synchronization disappears between signal intensity and signal peak, usually it is hard to assure the fluorescence intensity and peak location.However, signal from wavelet filter may ignore the affect and identify the protoporphyrin IX in human blood serum with the help of biorthogonal spline wavelet.As the linear alternation of wavelet and discrete details signals maintain their inborn linear relations, the authors can carry out the qualitative and quantitative analysis for the precise content and quantity of protoporphyrin IX in blood serum, which provides a feasible method for the application of blood serum fluorescence spectrum to tumor early diagnosis.
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Received: 2007-02-09
Accepted: 2007-05-19
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Corresponding Authors:
NI Xiao-wu
E-mail: xiaosenluo@yahoo.com.cn
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