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Microcalorimetry combined with chemometics for antibacterial evaluation of Sophora alopecuroides on Staphylococcus aureus

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Abstract

This study aimed to evaluate the antibacterial activities of Sophora alopecuroides from various production regions of China on Staphylococcus aureus by microcalorimetry and chemometics. From the heat-flow power–time curves of S. aureus growth affected by the extracts of S. alopecuroides, some vital thermokinetic parameters, such as the growth rate constant (k), the maximum heat-production rate (Pm), the appearance time (tm) and the total heat-production (Q), were obtained and were analyzed by principal component analysis and hierarchical cluster analysis. The results showed that all the S. alopecuroides samples expressed strong antibacterial activities to S. aureus, but the activities varied evidently on their production regions. The samples from Xinjiang (northwest region of China) showed the strongest antibacterial activities with inhibitory ratio (I) of 81.3%, while those from Inner Mongolia (North region of China) gave the contrast results with I of 9.2%. The findings indicated that the anti-S. aureus activities of S. alopecuroides had close relationship with the production regions. This study has provided a combined model of microcalorimetry and chemometrics to evaluate the antibacterial activities of medicinal herbs on bacteria.

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Acknowledgments

The financial support of the National Science Foundation of China (Nos. 3097394, 81073043 and 81173571), the National Key Technology R&D Program (Nos. 2012BAI29B02 and 2012ZX10005010-002-002) and the National Industry Program of China (Nos. 200807020 and 201207002) is gratefully acknowledged.

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ZM, CZ and RW performed the investigation, analyzed the data and wrote the paper; JW, KZ and XX designed the study and amended the paper; QZ, XY and CS helped in execution of research; JW, KZ, XX and all the other authors read, improved and approved the manuscript.

Corresponding authors

Correspondence to Kui-jun Zhao, Shi-biao Pu or Xiao-he Xiao.

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Ma, Zj., Zhang, Ce., Wang, Rl. et al. Microcalorimetry combined with chemometics for antibacterial evaluation of Sophora alopecuroides on Staphylococcus aureus. J Therm Anal Calorim 134, 1883–1891 (2018). https://doi.org/10.1007/s10973-018-7358-9

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  • DOI: https://doi.org/10.1007/s10973-018-7358-9

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