Based on supramolecular chemistry to explore the scientific connotation of the compatibility between licorice and the insoluble mineral medicine gypsum
Licorice-gypsum(gancao-shigao,GC-SG)drug pair was used as the research object,using supra-molecular chemistry to explore the scientific connotation of combining herbal medicine GC with insoluble mineral medicine SG in clinical application of traditional Chinese medicine.① The Tyndall effect,microscopic morphology and particle size of the single and co-decocted of GC and SG were observed,the paste content and conductivity were determined,and the interaction between GC and SG was detected by isothermal titration calorimetry(ITC)and infrared absorption spectroscopy(IR).② Calcium chloride(CaCl2),a soluble calcium salt of equal gypsum quality,was used instead of SG with GC for co-decocting to explore the effect of calcium salt content on the water decocting,and the characteristics were combined with the Tyndall effect,microscopic morphology,paste content and conductivity.ITC and IR techniques were used to detect the interaction between the two,and the interaction between them was detected by ITC and IR.The zeta potential and ultraviolet-visible spectrophotometry(UV-vis)of GC-SG and GC-CaCl2 co-decoction were compared,and the inorganic and organic components in the co-decoc-tion were detected by inductively coupled plasma optical emission spectrometer(ICP-OES)and high performance liquid chromatography(HPLC).The results showed:① Compared with the liquid phase of single decoction,GC-SG co-decoction had more obvious Tyndall effect,and showed uniform spherical nanoparticles under electron microscope.Physical characterization results such as paste content and conductivity showed that co-decoction promoted the dissolution of each other's components;ITC and IR results showed that there was strong interaction between GC and SG,which preliminatively indicated that GC and SG co-decoction promoted the formation of uniform and stable supramolecular system of traditional Chinese medicine.② When soluble calcium salt was used to substitute insoluble SG with GC for co-decocting,a stronger but astigmatic light path appeared than single decocting solution,the zeta potential was reduced,and a large number of accumulated polymers were formed.The results of paste content and conductivity showed that the dissolution of the co-decocting component was reduced than the single decocting component.ITC,UV-vis and IR results showed that there was interaction between GC with Ca2+and SG.The formation of polysink indicated that a large amount of soluble calcium salt would destroy the stability of supramolecular Chinese medicine.The results of ICP-OES and HPLC showed that the glycyrrhizic acid(GA)content of the former lower than the latter,which was related to the formation of a large number of polycondensates with the increase of Ca2+concentration and the decrease of the dissolution of GA and other active ingredients.This study indicates that the compatibility of GC and SG can form a uniform and stable supramolecular system of traditional Chinese medicine.Calcium salt,the main component of SG,is taken as the starting point.Excessive soluble Ca2+can promote the aggregation of active ingredients such as GA,so as to reveal the scientific connotation of the compatibility of GC and SG,an insoluble mineral medicine.
licoricegypsuminsoluble mineral medicineChinese medicine supramoleculesoluble calcium saltcompatibility
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