abstract Cell metabolite analysis is of great interest to analytical chemists and physiologists, with some meta-bolites having been identified as important indicators of major diseases such as cancer. A high-throughput and sensitive method for drug metabolite analysis will largely promote the drug discovery industry. The basic barrier of metabolite analysis comes from the interference of complex components in cell biological system and low abundance of target substances. As a powerful tool in biosample analysis, microfluidic chip enhances the sensitivity and throughput by integrating multiple functional units into one chip. In this review, we discussed three critical steps of establishing functional microfluidic platform for cellular metabolism study. Cell in vitro culture model, on chip sample pretreatment, and microchip combined detectors were described in details and demonstrated by works in five years. And a brief summary was given to discuss the advantages as well as challenges of applying microchip method in cell metabolite and biosample analysis.

TORCH test that include serological and nucleic acid tests for Toxoplasmosis, other virus, rubella virus, cytomegalovirus and herpes simplex virus is a group of test markers for screening TORCH infection during pregnancy, organ transplantation and serious diseases. For correct application of TORCH testa in clinical laboratories, it is very important to establish reasonable teat procedure and to give an correct interpretation of TORCH test results.

Objective To explore the effects of microwave radiation from interphone on the electrocardiogram of occupational population. Methods 165 male security personnels (working age: 0.5-3.32 a) often exposed to microwave radiation from interphone and 80 male staffs (working age: 0.5-3.58 a) without exposure to microwave radiation in a same security guard company were selected for examination of electrocardiogram in June-July,2004. Results The prevalences of sinus arrhythmia,sinus bradycardia,and the total abnormal rate of electrocardiogram in exposure group were significantly higher than those in control group(P

A simple and rapid expression and purification method of recombinant firefly luciferase was developed for bacteria detection. A modified luciferase gene from North American firefly Photinus pyralis was cloned into pET28a expression vector and the recombinant protein was produced in Escherichia coli BL21. The recombinant luciferase, equipped with a polyhistidine affinity tag, was purified by immobilized metal ion affinity chromatography (IMAC). The approach generated an abundant expression and an efficient purification of a recombinant luciferase with final yield 1.995mg/L of cell culture. Experiments on the recombinant luciferase also showed that the relative light units (RUL) of the enzyme were 5.8×108, and the specific activity was 2.9×1010 RLU/mg. By applying adenosine triphosphate (ATP) bioluminescence to detection of the coin bacteria using the recombinant protein, the ATP content of bacteria was 9.48×10-16mol/mL, and was identical to the bacteria counts (4500CFU/mL) in order of magnitude. Taken together, our results provided a simple and efficacious method of the preparation of recombinant luciferase, which could be applied in the determination of bacteria via ATP bioluminescence.

Glypican-3 （GPC3） is reported as a great promising tumor marker for hepatocellular carcinoma （HCC） diagnosis. Highly sensitive and accurate analysis of serum GPC3 （sGPC3）, in combination with or instead of traditional HCC marker alpha-fetoprotein （AFP）, is essential for early diagnosis of I-ICC. Biomaterial-functionalized magnetic particles have been utilized as solid supports with good biological compatibility for sensitive immunoassay. Here, the magnetic nanoparticles （MnPs） and magnetic microparticles （MmPs） with carboxyl groups were further modified with streptavidin, and applied for the development of chemiluminescence enzyme immunoassay （CLEIA）. After comparing between MnPs- and MmPs-based CLEIA, MnPs-based CLEIA was proved to be a better method with less assay time, greater sensitivity, better linearity and longer chemiluminescence platform. MnPs-based CLEIA was applied for detection of sGPC3 in normal liver, hepatocirrhosis, secondary liver cancer and HCC serum samples. The results indicated that sGPC3 was effective in diagnosis of HCC with high performance.

A chemiluminescence enzyme immunoassay based on magnetic microparicles (MmPsCLEIA) was developed to evaluate serum α-fetoprotein (AFP) in parallel with tramional colorimetric enzyme-linked immunsorbrnt assay (ELISA).A sestematic comparison between the MmPs-CLEIA and colorimetric ELISA concluded that the MPs-CLEIA exhibited fewer of immunoreagents,less total assay time,and better linearity,recovery,precision,senitivity and validity.AFP was detected in forty human serum samples by the proposed MPs-CLEIA and ELISA,and the results werecompared with commercial electrochemilunminescence immunoassay (ECLIA) kit.The correlation coefficient between MPs-CLEIA and ELISA was obtained with R2=0.6703; however,the correlation between MPs-CLEIA and ECLIA (R2=0.9582) was obviously better than that between colorimetric ELISA and ECLIA (R2=0.6866).

Glypican-3 (GPC3) is reported as a great promising tumor marker for hepatocellular carcinoma (HCC) diagnosis.Highly sensitive and accurate analysis of serum GPC3 (sGPC3),in combination with or instead of traditional HCC marker alpha-fetoprotein (AFP),is essential for early diagnosis of HCC.Biomaterial-functionalized magnetic particles have been utilized as solid supports with good biological compatibility for sensitive immunoassay.Here,the magnetic nanoparticles (MnPs) and magnetic microparticles (MmPs) with carboxyl groups were further modified with streptavidin,and applied for the development of chemiluminescence enzyme immunoassay (CLEIA).After comparing between MnPs- and MmPs-based CLEIA,MnPs-based CLEIA was proved to be a better method with less assay time,greater sensitivity,better linearity and longer chemiluminescence platform.MnPs-based CLEIA was applied for detection of sGPC3 in normal liver,hepatoeirrhosis,secondary liver cancer and HCC serum samples.The results indicated that sGPC3 was effective in diagnosis of HCC with high performance.

Monolithic silica spin column extraction (MonoSpin-SPE) was developed as a simple,sensitive,and eco-friendly pretreatment method which combined with ultra-fast liquid chromatography-mass spectrometry (UFLC-MS) to determine the levels of six phthalate esters,dimethyl-(DMP),diethyl-(DEP),dipropyl-[DPrP],butyl-benzyl-(BBP),dicyclohexyl(DcHP),and di-n-octyl-(DOP) phthalate in physiological saline samples.Under optimized experimental conditions,the method was linear in the following ranges:0.2 - 50 μg/L for DMP,DEP,DPrP,DcHP and DOP; 5- 100,μg/L for BBP.The correlation coefficients (R2 ) were in the range of 0.9951- 0.9995 for all the analytes and the limits of detection (LODs) and limits of quantification (LOQs) were in the ranges of 0.02- 0.9 μg/L and 0.08- 2.7 μg/L,respectively.The pretreatment process showed good reproducibility with inter-day and intra-day relative standard deviations (RSDs) below 8.5％ and 11.2％,respectively.This method was used to determine the levels of six phthalate esters in physiological saline samples and the recoveries ranged from 71.2％ to 107.3％.DMP and DEP were found in actual physical saline samples (brand A and brand B).

Objective To investigate the inclusion of ginsenoside Rg_3 with hydroxylpropyl-?-cyclodextrin (HP-?-CD) in aqueous solutions, inclusion molar ratio of host and guest molecules, and change of thermodynamic parameters during the inclusion process. Methods The measurements of the inclusion mechanism, inclusion molar of the host and guest molecules, and change of thermodynamic parameters were carried out by the following methods: phase solubility, IR, NMR, and TLC methods, respectively. Results The results indicated that the inclusion compound of ginsenoside Rg_3-HP-?-CD was formed. The content analysis of the inclusion compound showed that the inclusion ratio of ginsenoside Rg_3-HP-?-CD was 1∶1. The change in the thermodynamic parameters suggested that the inclusion could proceed (△G

To evaluate effects and mechanism of Captopril on BP of 2 -kidney, 1 -clip reno-vascular hypertensive rats ( 2K1C - RHR ), Platelets cytosolic free calcium, concentration ([Ca2+]i) and platelets aggregation (PAg) are measured. The results are as follows: [Ca2+ ]; and PAg increase significantly (P