Objective To establish a solid phase extraction(SPE)-high performance liquid chromatography(HPLC)method for determination of melamine in foods. Methods Melamine in sample was extracted with extractive agent. After centrifugation, the supernatant fluid was purified by Waters Oasis MCX cartridge,and detected with HPLC method. Chromatographic column of TIANHE C18(250 mm?4.6 mm,5 ?m) was used at 35 ℃ and mobile phase was water(containing 0.01 mol/L 1-hexanesulfonic acid sodium salt and 0.01 mol/L citric acid)∶ acetonitrile = 94∶6 (V∶V) at a flow rate of 1.0 ml/min. Injection volume was 20 ?l. Results In the range of 0.80 to 80.0 mg/L, the regression equation was y=84.64 x-6.127 1 with the correlation coefficient of 0.999 98. The detection limit of melamine in foods was 0.5 mg/kg. The average rates of recovery were 88.0%-96.0% and the relative standard deviation was less than 5%. Conclusion The method established in the present paper is applicable to determination of melamine in foods with good precision,accuracy and sensitivity.

A novel high performance liquid chromatographic method was developed for the determination of 4-O-methylhonokiol in rabbit plasma and was applied to its pharmacokinetic investigation.Plasma samples were treated by one-fold volume of methanol and acetonitrile to remove the interference proteins.A reverse phase column of SHIMPACK VP-ODS (150 mm× 4.6 mm,5.0 μm) was used to separate 4-O-methylhonokiol in the plasma samples.The detection limit of 4-O-methylhonokiol was 0.2 μg/L and the linear range was 0.012- 1.536 mg/L.The good extraction recoveries were obtained for the spiked samples (84.7％,89.3％ and 87.7％ for low,middle and high concentrations of added standards,respectively).The relative standard deviation of intra-day and inter-day precisions was in the range from 0.6％ to 13.5％.The pharmacokinetic study of 4-O-methylhonokiol was made and the results from the plasmaconcentration curve of 4-O-methylhonokiol showed a two-apartment open model.This work developed a sensitive,stable and rapid HPLC method for the determination of 4-O-methylhonokiol and the developed method has been successfully applied to a pharmacokinetic study of 4-O-methylhonokiol.

A novel high performance liquid chromatographic method was developed for the determination of 4-O- methylhonokiol in rabbit plasma and was applied to its pharmacokinetic investigation. Plasma samples were treated by one-fold volume of methanol and acetonitrile to remove the interference proteins. A reverse phase column of SHIM- PACK VP-ODS （150 mm ×4.6 mm, 5.0 μm） was used to separate 4-O-methylhonokiol in the plasma samples. The detection limit of 4-O-methylhonokiol was 0.2 μg/L and the linear range was 0. 012 - 1. 536 mg/L. The good extraction recoveries were obtained for the spiked samples （84.7%, 89.3% and 87.7% for low, middle and high concentrations of added standards, respectively）. The relative standard deviation of intra-day and inter-day precisions was in the range from 0.6% to 13.5%. The pharmacokinetic study of 4-O-methylhonokiol was made and the results from the plasmaconcentration curve of 4-0-methylhonokiol showed a two-apartment open model. This work developed a sensitive, stable and rapid HPLC method for the determination of 4-O-methylhonokiol and the developed method has been successfully applied to a pharmacokinetic study of 4-O-methylhonokiol.

Objective To investigate factors related to chronic pain in those injured with fractures 27 months after the Sichuan earthquake.The correlation between intensity of pain and quality of life was also analyzed.Methods A total of 705 victims were investigated on site.Their residual pain was categorized using a visual analogue scale (VAS) score as no pain,mild pain,moderate pain or severe pain.The pain-related biological,psychological and social factors were analyzed using the Barthel Index ( BI ),Life Satisfaction Questionaire-11 ( LiSat-11 )and the SF-36 health questionnaire. Rehabilitation and surgical interventions,employment,income and emotional status were also investigated. Results The incidence of chronic pain was 88.5％ in this population,of which mild pain and moderate pain were 35.7％ and 33.3％,respectively.The percentage of the victims who had received fracture surgery was 65.8％ ; the percentage of those who had recovered was 96.9％.BI scores for the victims without pain,with mild,moderate and severe pain were 92.7 + 10.2,92.8 + 8.4,91.2 ± 9.9 and 90.4 + 14.7,respectively ; the differences between these groups were all statistically insignificant.The influence of pain intensity on life satisfaction showed a significant linear trend.The percentages of the victims with restricted occupational ability in the four groups were 38.3％,61.5％,75.7％ and 62.8％ respectively.The median of personal annual income were ￥ 3550,￥ 2500,￥ 2000 and ￥ 2500.The VAS scores were significantly related to abnormal emotions,life satisfaction,employment and annual income.The subjects with different levels of residual pain also showed significant differences in the physical functioning,role-physical,bodily pain,general health,vitality,social functioning,role-emotional and mental health sub-scales of the SF-36.The total SF-36 scores were highest among victims without pain (70.6 + 17.5) and declined significantly in those with mild (61.3 + 14.3 ),moderate (52.7 + 14.3 ) and severe pain (52.3 + 14.7 ).This negative correlation between pain intensity and SF-36 total score was statistically significant. Conclusions Chronic pain remains common among fracture victims 27 months after the earthquake.Its intensity is correlated with psychological and social factors as well as quality of life.

Objective To investigate the female human papillomavirus(HPV)infection situation in Baoan district,the HPV pos-itive rates in different age groups and the subtypes distribution.Methods PCR followed with reverse dot blot was performed to ex-amine 23 kinds of HPV genotypes in 2 627 female patients in our hospital from the January 2011 to December 2012.Results In 2 627 samples,the positive rate of HPV was 23.94% (629 cases),in which the infection rate of single low-risk type was 15.1%(95 cases),the main HPV genotype was HPV43 (7.79%);the infection rate of high-risk type was 55.17% (347 cases),the 3 most prevalent HPV genotypes were HPV52 (12.56%),HPV16 (9.86%)and HPV58 (7.79%).The multiple HPV infection ac-counted for 29.73% (187 cases).The HPV infection rates in different age groups were 50.0% in age 15-20 years,24.7% in age 21-30 years,20.8% in age 31-40 years,25.8% in age 41 -50 years,42.1% in age >50 years respectively,the differences had statistical significance.Conclusion The HPV infection rate is 23.94% in Bao′an district.The most prevalent HPV genotypes are HPV 52,16,58,43.Women in age 15-20 years old have a higher infection rate.

The central nervous system (CNS) plays a key regulatory role in glucose homeostasis. In particular, the brain is important in initiating and coordinating protective counterregulatory responses when blood glucose levels fall. This may due to the metabolic dependency of the CNS on glucose, and protection of food supply to the brain. In healthy subjects, blood glucose is normally maintained within a relatively narrow range. Hypoglycemia in diabetic patients can increase the risk of complications, such as heart disease and diabetic peripheral neuropathy. The clinical research finds that the use of traditional Chinese medicine (TCM) has a positive effect on the treatment of hypoglycemia. Here the authors reviewed the current understanding of sensing and counterregulatory responses to hypoglycemia, and discuss combining traditional Chinese and Western medicine and the theory of iatrogenic hypoglycemia in diabetes treatment. Furthermore, the authors clarify the feasibility of treating hypoglycemia on the basis of TCM theory and CNS and have an insight on its clinical practice.

Objective To investigate the incidence and risk factors of chronic cough in children aged 6-14 years. Methods The incidence of chronic cough in children aged 6-14 years in Qinhuangdao city was investigated by questionnaire. Results A total of 4 000 questionnaires were distributed, 3 785 of them were effectively recovered, with the recovery rate of 94.6%. The incidence of chronic cough in children aged 6-14 was 5.1% (194/3 785). The prevalence rates of boys and girls were 5.4% (101/1 859) and 4.8% (93/1 926), respectively, with no significant difference (χ²=0.641，P=0.873). The incidence rate of children in industrial town area 6.7% (64/955) was significantly higher than that in urban area 4.4% (85/1 917) and agricultural town 4.9% (45/913) (χ²=55.082，P=0.000). The risk factors showed that chronic cough was associated with long-term allergen exposure, allergic constitution, asthma, rhinitis, reflux esophagitis and other nasopharynx diseases (χ²=17.833，43.370，194.466，27.773，101.92，11.268，P =0.000). Regression model analysis showed that asthma, rhinitis and allergen long-term exposure were independent risk factors of chronic cough (Wald=15.352，10.174，12.625，12.659，P =0.000). Conclusion The incidence rate of children in industrial town is higher in Qinhuangdao City than those in other urban areas, 6~14 years old children. Asthma, rhinitis and allergen exposure are the main causes of chronic cough.

OBJECTIVE: To analyze the effect of conjugated linoleic acid (CLA) on glucose and lipid metabolism in obese diabetic (db/db) mice. METHODS: db/db mice were randomized for treatment with saline or CLA mixture administered intragastrically. The changes in body weight, dietary intake, water intake, oral glucose tolerance, triglyceride and total cholesterol were recorded after the treatments. HE staining and oil red O staining were used to assess liver pathologies and fatty acid content. The expression levels of PPARα, PPARγ, CD36, CHREBP and SREBP-1c were detected using real-time PCR and Western blotting. HepG2 cells were treated with CLA and linoleic acid and the expressions of PPARα, ACC, P-ACC, and CD36 were detected; the level of acetyl-CoA in the cell supernatant was detected using ELISA. RESULTS: CLA treatment obviously reduced the dietary and water intake of db/db mice, effectively reduced the body weight and decreased serum triglyceride and cholesterol levels ( < 0.05). CLA significantly reduced fasting blood glucose, increased glucose tolerance, reduced the accumulation of lipid droplets in the liver and improved lipid metabolism in db/db mice. The mice showed significantly increased expression of PPARα ( < 0.05) and lowered CD36 expression ( < 0.001) in the liver after CLA treatment. Cellular experiments showed that CLA significantly up-regulated PPARα ( < 0.001) and P-ACC and decreased the expression of CD36 ( < 0.01). ELISA showed that acetyl-CoA was significantly up-regulated in the cells after CLA treatment ( < 0.01). CONCLUSIONS The mixture of two conjugated linoleic acid isomers can reduce fasting blood glucose, increase glucose tolerance and improve glycolipid metabolism in db/db mice by enhancing the expression of PPARα, increasing P-ACC and inhibiting CD36 expression.
Animals ; Diabetes Mellitus, Experimental ; Glucose ; Linoleic Acids, Conjugated ; Lipid Metabolism ; Liver ; Mice ; Triglycerides

【Objective】 To investigate the condition of confidential unit exclusion(CUE) in Guangzhou, so as to ensure blood safety. 【Methods】 The number of CUE donors, demographic characteristics of CUE donors, reasons for CUE, and response time of CUE after blood donation in Guangzhou from 2009 to 2022 were statistically analyzed. 【Results】 From 2009 to 2022, the response ratios of CUE was 0.006 2% (260/4 170 984) and the ratios had statistically significant difference between different years(P<0.05). For the response ratios of CUE, no statistically significant difference was noticed in gender and occupation (P>0.05), but statistically significant differences were found in age, number of blood donations, education background, and marital status (P<0.05). Blood donors aged 18~30 (0.007 3%, P<0.05) and first-time blood donors (0.010 8%, P<0.05) were the main groups of CUE. High risk sexual behavior (28.46%, 74/260) was the primary reason for CUE. The CUE response peak was within 72 hours after blood donation, and the response ratios within 24-72 hours after blood donation was the highest (68.46%, 178/260). 【Conclusion】 CUE is a crucial measure to ensure blood safety. Detailed pre-donation health consultations are suggested for blood donors aged 18-30 and first-time blood donors so as to better excluding high-risk blood donors. Strengthening the publicity of CUE response and process, registering and classifying the reasons for CUE are also important.

Fibroblast growth factor receptors (FGFRs) have emerged as promising targets for anticancer therapy. In this study, we synthesized and evaluated the biological activity of 66 pyrazolo[3,4-