The synthesis of thermostable, strongly basic Anion-Exchange resins using Cross-Linked biguanide and its application in the extraction of Sodium copper chlorophyllin.

Commercially available, strongly basic anion-exchange resins with quaternary ammonium groups have been widely used in the purification of natural plant extracts. However, under the condition of high temperature (greater than 60 °C), these resins could not be used for long periods because of the Hofmann degradation of the strongly basic groups. In this work, the synthesis of novel, thermally stable, strongly basic resins, which has a cross-link biguanide structure, was reported. The mechanism of thermal degradation was investigated, and the result indicated that not only the stability of the functional group but also the link mode between the functional group and the resin matrix should influence the thermal stability of the resin. In our experiment, the PDG2 resin was selected to separate sodium copper chlorophyllin (SCC), a type of edible pigment derived from plants, due to its optimal thermal stability and adsorption capacity. The adsorption mechanism and thermodynamics of PDG2 were also investigated. The results demonstrated that the main adsorption affinity of PDG2 toward SCC was due to the synergistic effects of the hydrophobic and ionic interactions, and the rise in temperature will benefit the adsorption equilibrium, which differed from the equilibrium for lutein. Therefore, under suitable gradient desorption conditions, a high-purity SCC extract was prepared. After eight cycles, the adsorption capacity of the PDG2 remained constant and reproducible at a high temperature (70 °C).

A Research Progress on the Antimicrobial Proteins of Ginseng / 世界科学技术-中医药现代化

Panax ginseng is a precious medicinal herb both in China and abroad with high medicinal and economic value.Ginseng disease has been recognized as the main factor restricting its application.Modern molecular biology for the disease resistance of ginseng promoted the development of new methods.In this study,it was found that the antimicrobial proteins of ginseng involved lipid transfer protein,cyclophilin,defensins,PR-4 and PR-10,showing inhibitory effects on various pathogens.These findings provided a reference for the control of ginseng diseases.

Clinical study of modifiedXiaochengqi decoction in the treatment of gastroparesis syndrome / 国际中医中药杂志

Objective To evaluate the efficacy of modifiedXiaochengqi decoction in treatment of gastroparesis syndrome (GS).Methods A total of 81 patients with GS from 2010 July to 2013 July in HuiZhou Municipal Central Hospital were selected and randomly recruited into a control group and a treatment group. The control group was treated with domperidone, 15-30 min before the meal, while the treatment group was additionally treated with modifiedXiaochengqi decoction on the basis of the control group. Both groups were treated for 4 weeks. The clinical curative effect, and the symptoms in both groups were observed. The serum motilin and gastrin concentration were measured by radio-immunity, the preprandial and postprandial electrogastrography was performed.Results The total effective rate in the treatment group was significantly higher than that in the control group (72.5%vs. 31.7%;χ2=11.911,P=0.000). The serum levels of motilin (treatment group: 532.8±16.7 ng/Lvs. 355.2±14.3 ng/L,t=51.089,P=0.000; control group: 505.1 ± 21.3 ng/Lvs. 372.9 ± 18.4 ng/L,t=30.074,P=0.000) and gastrin (treatment group: 69.8 ± 15.3 ng/Lvs. 54.3 ± 13.8 ng/L, t=4.758,P=0.000; control group: 62.6 ± 14.2 ng/Lvs. 53.4 ± 12.3 ng/L,t=3.136,P=0.002) were significantly reduced, and their decrease in the treatment group were greater than those in the control group (t values were 6.503, 2.196, allP<0.05). After the treatment, the dominant power (preprandial period: 84.5 ± 14.8μVvs. 72.3 ± 15.0μV, t=3.684,P<0.01; postprandial period: 100.5 ± 17.3μVvs.89.3 ± 15.9μV,t=5.713,P=0.000) and dominant frequency (preprandial period: 4.3 ± 0.4 cpmvs. 3.9 ± 0.2 cpm,t=3.035,P=0.000; postprandial period: 4.7 ± 0.5 cpmvs. 4.4 ± 0.5 cpm,t=2.700,P=0.000) were significantly higher, while the percentage of bradygastria (preprandial period: 50.6% ± 16.6%vs. 60.1% ± 16.3%,t=2.599,P=0.000;postprandial period: 36.6% ± 14.8%vs. 57.4% ± 15.3%,t=6.217, P=0.000) was significantly lower in the treatment group compared with the control group at preprandial and postprandial periods.ConclusionXiaochengqi decoction can obviously promote the gastric motility, and reduce the serum levels of motilin and gastrin in patients with GS.

The correlations of infection rates with the administration timing of prophylactic antibiotics after hip arthroplasty / 实用医学杂志

Objective To assess the effects of different administration timing of prophylactic antibiotics on infections after hip arthroplasty. Methods 535 patients having undergone arthroplasty were divided into two groups: the experiment group (n=273)and the control group (n=262): The former groupwere administered with antibiotics until 24 hours postoperatively and the latter until 72 hours postoperatively. The two groups were compared in terms of postoperative infection rate. Results The infection rates in the experimental groupand the control group were 4.396%and 3..817%, with insignificant differencebetween them. Conclusion For those patients undergoing hip arthroplasty, extended administration of antibiotics after operation (over 48 hours) may not reduce the risk of recent the infection rate.