Abstract
Using the 3114/3115 thermal activity monitor (TAM) air isothermal microcalorimeter, ampoule mode, the heat output of Candida albicans growth at 37°C was measured, and the effect of emodin on C. albicans growth was evaluated by microcalorimetry coupled with chemometric methods. The similarities between the heat flow power (HFP)–time curves of C. albicans growth affected by different concentrations of emodin were calculated by similarity analysis (SA). In the correspondence analysis (CA) diagram of eight quantitative parameters taken from the HFP–time curves, it could be deduced that emodin had definite dose-effect relationship as the distance between different concentrations of it increased along with the dosage and the effect. From the principal component analysis (PCA) on eight quantitative parameters, the action of emodin on C. albicans growth could be easily evaluated by analyzing the change of values of the main two parameters, growth rate constant k 2 and maximum power output \( P_{\text{m}}^2 \). The coherent results of SA, CA, and PCA showed that emodin at different concentrations had different effects on C. albicans growth metabolism: A low concentration (0–10 μg ml−1) poorly inhibited the growth of C. albicans, and a high concentration (15–35 μg ml−1) could notably inhibit growth of this fungus. This work provided a useful idea of the combination of microcalorimetry and chemometric analysis for investigating the effect of drug and other compounds on microbes.
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Acknowledgments
The authors are grateful for the support from the National Basic Research Program of China (973 project; 2007CB512607), the State Youth Science Foundation (30625042), and National Natural Science Foundation of China (No.30772740 and 30600824).
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Kong, W.J., Wang, J.B., Jin, C. et al. Effect of emodin on Candida albicans growth investigated by microcalorimetry combined with chemometric analysis. Appl Microbiol Biotechnol 83, 1183–1190 (2009). https://doi.org/10.1007/s00253-009-2054-0
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DOI: https://doi.org/10.1007/s00253-009-2054-0