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Molecules 2017, 22(9), 1456; doi:10.3390/molecules22091456

Origin and Formation Mechanism Investigation of Compound Precipitation from the Traditional Chinese Prescription Huang-Lian-Jie-Du-Tang by Isothermal Titration Calorimetry

1
School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing 100102, China
2
Department of Pathology, Beijing University of Chinese Medicine, Beijing 100102, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 7 August 2017 / Revised: 30 August 2017 / Accepted: 31 August 2017 / Published: 1 September 2017
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Abstract

Previous studies have shown that compounds in the form of precipitate (CFP) from Huang-Lian-Jie-Du-Tang (HLJDT) were stable, and the CFP content reached 2.63% of the whole decoction and had good neuroprotective effects. However, there has been no research on their specific source. In this study, it was found that HLJDT CFP mainly came from the reaction of Scutellaria baicalensis and Coptis chinensis by studying the separated prescription components (accounting for 81.33% of HLJDT CFP). Unlike previous studies on HLJDT CFP, in this research the chemical composition of Scutellaria baicalensis–Coptis chinensis (SB–CC) CFP was identified by high performance liquid chromatography coupled with mass spectrometry (HPLC-MSn), which further proved that the main source of HLJDT CFP was Scutellaria baicalensis–Coptis chinensis CFP compared with previous HLJDT CFP studies. To explain the reaction mechanism between the decoctions of Scutellaria baicalensis and Coptis chinensis, isothermal titration calorimetry (ITC) was used to analyze their binding heat and the thermodynamic parameters (ΔH, ΔS, ΔG, n, Ka) of the reaction between baicalin and berberine, which are the main components of Scutellaria baicalensis and Coptis chinensis, respectively. The results showed that the reaction between decoctions of Scutellaria baicalensis and Coptis chinensis was exothermic and the reaction between baicalin and berberine was a spontaneous and enthalpy-driven chemical reaction, the binding ratio being 1:1. In addition, HLJDT CFP (EC50 = 14.71 ± 0.91 µg/mL) and SB-CC CFP (EC50 = 6.11 ± 0.12 µg/mL) showed similar protective activities on PC12 cells injured by cobalt chloride (CoCl2). This study provided a new angle to research on the main chemical components and therapeutic values of CFP in Traditional Chinese Medicine compounds. View Full-Text
Keywords: compounds in the form of precipitation (CFP); Huang-Lian-Jie-Du-Tang (HLJDT); separated prescriptions; isothermal titration calorimetry (ITC); neuroprotective effect compounds in the form of precipitation (CFP); Huang-Lian-Jie-Du-Tang (HLJDT); separated prescriptions; isothermal titration calorimetry (ITC); neuroprotective effect
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Wang, H.; Li, T.; Xiang, H.; Zhang, X.; Fang, K.; Wu, G.; Yan, M.; Xue, N.; Chen, M.; Xie, T.; Zhang, Y.; Wang, P.; Lei, H. Origin and Formation Mechanism Investigation of Compound Precipitation from the Traditional Chinese Prescription Huang-Lian-Jie-Du-Tang by Isothermal Titration Calorimetry. Molecules 2017, 22, 1456.

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