Research Progress of Natural Active Components against Damage from UV Radiation

The sun's ultraviolet(UV)rays are extremely harmful to the skin.In addition to causing sunburn and aging,excessive UV radiation can also lead to benign or malignant skin tumors.This paper reviews the researches on natural active components against damage from UV radiation,and summarizes the types of compounds,research methods and mechanisms of action.Moreover,the main problems in current research are put forward,and the possible development direction in the future is discussed.

In vitro Pharmacological Activity of Chromenes in Disk of Helianthus annuus

[Objectives]The anti-tumor,anti-bacterial,anti-acetylcholinesterase and anti-α-glucosidase activity in vitro of five chromenes isolated from Helianthus annuus disk was studied,in order to provide reference for the development and utilization of H.annuus disk resources.[Methods]The effect of different concentrations of chromenes on the survival rate of leukemia HL-60 cells,lung cancer A549 cells,liver cancer SMMC-7721 cells,breast cancer MCF-7 cells and colon cancer SW480 cells was detected by MTS method,and the IC50 was calculated.The inhibitory activity of chromenes against Escherichia coli,Staphylococcus aureus subsp.aureus,Salmonella enterica subsp.enterica,Pseudomonas aeruginosa and Candida albicans was detected by microdilution method.The DTNB substrate method was used to detect the inhibitory activity of chromenes on acetylcholine.The PNPG substrate method was used to detect the inhibitory activity of chromenes onα-glucosidase.[Results]The five chromenes had no obvious in vitro inhibitory activity on the five kinds of tumor cells,with IC50 greater than 40μM.The five chromenes had no obvious in vitro inhibitory activity against the four kinds of bacteria and C.albicans.The five chromenes had certain inhibitory activity on acetylcholinesterase,and among them,6-acetyl-2,2-dimethylchromene and 6-acetyl-7-hydroxy-2,3-dimethylchromene showed strong inhibitory activity on acetylcholinesterase,with IC50 of 28.253 and 16.945μM,respectively,both smaller than that(0.275μM)of the positive control tacrine(P<0.01).The five chromenes showed good inhibitory effect onα-glucosidase,and among them,7-hydroxy-6-hydroxyacetyl-2,2-dimethylchromene and 6-acetyl-7-hydroxy-2,3-dimethylchromene had stronger inhibitory activity,with IC50 of 20.240 and 21.052μM,respectively,significantly better than that(169.780μM)of the positive control acarbose(P<0.01).[Conclusions]The five chromenes in H.annuus disk have certain in vitro inhibitory activity against acetylcholinesterase andα-glucosidase and certain potential in fighting neurodegenerative diseases and diabetes.

Content Determination of Quercetin and Kaempferol in Flueggea virosa(Roxb.ex Wild.)Baill.

[Objectives]The purpose was to determine the contents of quercetin and kaempferol in Flueggea virosa(Roxb.ex Wild.)Baill.,thereby providing reference data for the research and application of F.virosa.[Methods]Quercetin and kaempferol in F.virosa were extracted with ultrasonic method,using dilute hydrochloric acid-methanol(1∶10)solution as the extraction solvent,and their contents were determined with RP-HPLC.[Results]The contents of quercetin and kaempferol in F.virosa were 0.2336 and 0.3272 mg/g,respectively.[Conclusions]The method has high speed,high resolution,high sensitivity,accurate and reliable detection results,and can be used as a method for the determination of quercetin and kaempferol in F.virosa.

Exploration of Experimental Teaching of Analysis of Traditional Chinese Medicine Based on"Five-in-One"Practice Teaching System

Analysis of Traditional Chinese Medicine is a compulsory comprehensive professional course for Chinese pharmacy major,and it is the necessary knowledge for modern Chinese pharmacy talents.In this paper,the experimental teaching of Analysis of Traditional Chinese Medicine under the"five-in-one"practice teaching mode of Guangxi University of Chinese Medicine was explored to provide reference for the experimental teaching of the course Analysis of Traditional Chinese Medicine.