Biomedical subjects

Bing Shao

Publications and source records attributed to Bing Shao.

21 records · Page 2Linked to original sources

PubMed2003

[Analysis on Clenbuterol pollution in swine products in Beijing, 2002].

OBJECTIVE: To explore the status of clenbuterol pollution in swine products in Beijing city in 2002. METHODS: European Union method (EUR 15127-EN Cy2.3) was adopted to examine the samples. Samples were screened by enzyme-linked immunosorbent assay (ELISA) and confirmed by GC-MS. Detected limit of the method was 0.5 micro g/kg. Samples, including lung, liver, pork, kidney and urine of swine, were collected from slaughterhouses, refrigeratories and markets in 11 districts of Beijing. RESULTS: The results indicated that 185 out of 1 379 samples were positive with an annual positive rate of 13.4%. The highest was 15.7% in lung of swine, followed by urine 15.2% and pork liver 14.0%. CONCLUSION: Rates of detection had decreased from 30.0% to 2.7% during 2002.

Animals↗

PubMed2002

Determination of nonylphenol ethoxylates in the aquatic environment by normal phase liquid chromatography-electrospray mass spectrometry.

A comprehensive analytical method based on normal-phase liquid chromatography-electrospray ionization mass spectrometry (NPLC-ESI-MS) has been established for determination of nonylphenol ethoxylates (NPEOs) in the aquatic environment. Extraction and cleanup of samples were performed on graphitized carbon black (GCB) solid-phase extraction cartridges. Complete separation between each individual NPEOs was achieved by combining a C18 pre-column with a silica analytical column and using acetonitrile-water as eluent. Quantitative determination by LC-ESI-MS was achieved in the positive ionization (PI) mode at a ramped cone voltage for NPEOs using selected ion monitoring. Recoveries for NPEOs ranged between 91.9 and 117.5%, and the limits of detection varied between 0.5 and 2 ng/l for individual NPEOs with n longer than 2, and between 5 and 0.5 microg/l for NPIEO and NP2EO. This method was successfully applied to the investigation of residual NPEOs with n>2 in the Chongqing area of the Changjiang river. NPEOs with n ranging from 1 to 22 were found to vary between 0.1 and 2900 ng/l with a distribution depending on the depth of water.

Chromatography, Liquid↗

PubMed2002

[The transformation of nonylphenol ethoxylates in sewage treatment].

The concentrations of individual NPnEO (n > 2) were separated and analyzed by normal phase liquid chromatograph-mass spectrometry (NPLC-MS), and those of NP, NP1EO and NP2EO were determined by GC-MS. NP and NPnEO (n = 1-23) were found in the influent water, and the concentration of total NPnEO was 174 nmol/L. Of NPnEO, the abundance of NP2EO (89.6 nmol/L) was the highest, and next was NP (42.2 nmol/L) followed by NP1EO (12.2 nmol/L). 71% NP and NPnEO were removed by sewage treatment process and the adsorption on sludge contributed to the removal for these compounds. It was found that the adsorption of NPnEO on sludge followed the Dubinin-Astakhov model, assuming each NPEO were with similar adsorption potential.

Ethylene Glycols↗