光谱学与光谱分析 |
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Study on the Detection of Active Ingredient Contents of Paecilomyces hepiali Mycelium via Near Infrared Spectroscopy |
TENG Wei-zhuo1, SONG Jia1, MENG Fan-xin2, MENG Qing-fan1, LU Jia-hui1, HU Shuang1, TENG Li-rong1,2, WANG Di1*, XIE Jing1* |
1. College of Life Sciences, Jilin University, Changchun 130012, China 2. Zhuhai College of Jilin University, Guangzhou 519041, China |
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Abstract Partial least squares (PLS) and radial basis function neural network (RBFNN) combined with near infrared spectroscopy (NIR) were applied to develop models for cordycepic acid, polysaccharide and adenosine analysis in Paecilomyces hepialid fermentation mycelium. The developed models possess well generalization and predictive ability which can be applied for crude drugs and related productions determination. During the experiment, 214 Paecilomyces hepialid mycelium samples were obtained via chemical mutagenesis combined with submerged fermentation. The contents of cordycepic acid, polysaccharide and adenosine were determined via traditional methods and the near infrared spectroscopy data were collected. The outliers were removed and the numbers of calibration set were confirmed via Monte Carlo partial least square (MCPLS) method. Based on the values of degree of approach (Da), both moving window partial least squares (MWPLS) and moving window radial basis function neural network (MWRBFNN) were applied to optimize characteristic wavelength variables, optimum preprocessing methods and other important variables in the models. After comparison, the RBFNN, RBFNN and PLS models were developed successfully for cordycepic acid, polysaccharide and adenosine detection, and the correlation between reference values and predictive values in both calibration set (R2c) and validation set (R2p) of optimum models was 0.941 7 and 0.966 3, 0.980 3 and 0.985 0, and 0.976 1 and 0.972 8, respectively. All the data suggest that these models possess well fitness and predictive ability.
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Received: 2014-05-10
Accepted: 2014-07-24
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Corresponding Authors:
WANG Di, XIE Jing
E-mail: jluwangdi@jlu.edu.cn; xiejing@jlu.edu.cn
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