Research on common laws during membrane enrichment of six herbal volatile oils--physicochemical property and fingerprint similarity / 中国中药杂志

Membrane enrichment process of Chinese medicine volatile oil is green, practical and has a good application prospects. Schizonepetae Herba et al. six chinese medicine oily water were filtrated with polyvinylidene fluoride (PVDF) membrane with MWCO 70 000, at 40 degrees C, 0.1 MPa and 150 r x min(-1), common laws of physicochemical property of six oily water and fingerprint similarity between original and preserved oil were studied during membrane enrichment. Results were as follows: pH was gradually reduced to the minimum; conductivity firstly became larger, then smaller until 0; viscosity gradually increased to a maximum; surface tension gradually decreased to a minimum; turbidity firstly gradually increased, then reduced to a minimum; density gradually decreased to a minimum, but the change trend was opposite for Acori Tatarinowii Rhizoma with heavy oil; salinity was 0. In the end, pH reached a maximum and density reached a maximum (contrary for Acori Tatarinowii Rhizoma) and the other physicochemical property values reached a minimum for the last permeate. Fingerprint similarity between original and enriched volatile oil was above 90%. The above results provided data support and theoretical basis for the industrialization of membrane enrichment volatile oil technology.

Study on effect of oil-bearing solution environment of Caryophylli Flos and other traditional Chinese medicines on system flux and oil recovery rate / 中国中药杂志

The membrane enrichment process of traditional Chinese medicine volatile oil is environmental friendly and practical, with a good application prospect. In this article, oil-bearing solutions of eight traditional Chinese medicines, namely Caryophylli Flos, Schizonepetae Herba, Eupatorii Herb, Acori Talarinowii Rhizoma, Magnoliae Flos, Chrysanthemum indicum, Cyperi Rhizoma and Citri Reticulatae Pericarpium Viride, were taken as the experimental system. Under unified conditions (membrane: PVDF-14W, temperature: 40 degreeC, pressure: 0. 1 MPa, membrane surface speed: 150 r min- 1), trans-membrane was conducted for above eight oil-bearing solutions to explore the effect of their oil-bearing solution environment on system flux and oil recovery rate. The results showed that systems with smaller pH had a lower flux, without significant effect on oil recovery rate. Greater differences between the surface tension of solutions and that of pure water contributed to a lower oil recovery rate. The conductivity had no notable effect on membrane enrichment process. Systems with high turbidity had a lower flux, without remarkable effect on oil recovery rat. Heavy oils showed lower flux than light ones, but with a slightly higher oil recovery rat. Systems with higher viscosity had a lower flux than those with lower viscosity. Except for Magnoliae Flos volatile oil, all of the remaining volatile oils showed a much higher oil recovery rat than systems with high viscosity. The above results could provide data support and theoretical basis for the industrialization of membrane enrichment volatile oil technology.

Best pre-treatment method and its technology before ultrafiltration refination of Reduning water extract / 中草药

Objective: To study the best pre-treatment method and its technology before ultrafiltration of Reduning water extract. Methods: To investigate such pre-treatment methods as chitosan flocculation on the impurity of prescription water extract, as well as polysulfone ultrafiltration membrane refination effect with molecular weight cut-off three to five million. Results: The centrifugation and decompress filtration were not benefit to promote the geniposide reservation and reduce fouling degree of membrane. Absorption of active carbon could make the geniposide reservation deeply lower. The geniposide was reserved mostly and the total extracts reduced mostly for chitosan flocculation and microfiltration. But the flux was higher and the membrane fouling is smaller after chitosan flocculation. Conclusion: Chitosan flocculation is the best pre-treatment method. The operating conditions are that temperature of Reduning water extract is 70°C, pH value 6, and the dosage of 1% chitosan is 70 mL/L.