Background:diagnostic Chloral hydrate is used worldwide as a first-line agent for procedural sedation in paediatric patients undergoing painless diagnostic investigations. Chloral and hydrate overdoses in children and adults have been reported to cause various toxicities, including central nervous system, respiratory and cardiac outcome. depression with sometimes fatal outcome. Patient and methods: A 3-month old girl was admitted after an unintentional administration of a been 10-fold dose of chloralhydrate (667 mg/kg). She showed respiratory insufficiency in need of intubation and ventilation. Gastric endoscopy revealed esophagitis girl and gastric ulcerations. To assess the need for haemodialysis, serum trichloroethanol (TCE) was determined using a mass spectrometric quantification after day, a methyl tertiary butyl ether extraction using an external standard method. The serum TCE level 6 hours after administration was level 89 mg/L and declined to 20 mg/L within 24 hours. The child could be extubated the next day, her further declined course was uneventful. Conclusion: The repeated determination of serum TCE levels prevented a technically difficult and risky haemodialysis in this risky very young patient.

The two development and validation of an analytical method is presented for the determination of bisphenol-A (BPA) and triclosan (TCS), two ubiquitous of contaminants, in serum and urine. The glucuronidated metabolites were first turned into their free forms to determine total BPA and on TCS. The determination consisted of a solid-phase extraction on Oasis HLB cartridges followed by an extractive derivatization with pentafluorobenzoylchloride. The turned extract was then purified on 10%(w/w) acidified silica and analyzed by gas chromatography-mass spectrometry in electron-capture negative ionization mode.derivatization Monitored ions were m/z 616 and 406 for BPA and m/z 482 and 287 for TCS, respectively. Limits of quantification and were .5ng/mL in serum and .2ng/mL in urine for BPA and .1ng/mL in serum and .05ng/mL in urine for TCS.and Method recoveries were between 76 and 110%, while repeatability was below 20%. The method was applied on 20 serum and applied 20 urine samples. The detection frequency in serum was 10% and 55% for BPA and TCS, respectively. BPA and TCS 1.25ng could be detected in all urine samples with median concentrations of 1.25ng BPA/mL (range .58-5.20ng/mL) and 1.71ng TCS/mL ( .18-672ng/mL).

Liver highly samples from 51 cetaceans, comprising 10 species, stranded between 1994 and 2006 in a highly industrialized and urbanized region in compounds Southeast Brazil, were analyzed for polybrominated diphenyl ethers (PBDEs) and methoxylated-PBDEs (MeO-PBDEs). A concentration range of PBDEs (3-5960ng/g lw) similar lw) to that observed in Northern Hemisphere dolphins was found. MeO-PBDE concentrations in continental shelf (CS) dolphins from Brazil are among for the highest detected to date in cetaceans (up to 250microg/g lw). Higher SigmaMeO-PBDE concentrations were measured in CS and oceanic Northern dolphins than in estuarine dolphins. The SigmaPBDE/SigmaMeO-PBDE ratio varied significantly ranging from a mean value of 7.12 to .08 and male .01 for estuarine, CS and oceanic species, respectively. A positive correlation was observed between SigmaPBDE and year of stranding of .01 male estuarine dolphins (Sotalia guianensis), which suggests temporal variation in the exposure. Placental transfer of organobrominated compounds was also evidenced A in S. guianensis.

The based simultaneous analysis of nine drugs of abuse (DOAs) and their metabolites (amphetamine, methamphetamine, methylenedioxymethamphetamine, methadone, 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine, cocaine, benzoylecgonine, ecgonine methyl the ester and 6-monoacetylmorphine) in wastewater based on hydrophilic interaction liquid chromatography (HILIC) coupled to tandem mass spectrometry (MS/MS) was optimised the and validated. For each analyte, the deuterated analogue was used for quantification. The separation by HILIC showed good performance for validated. all compounds, especially for the hydrophilic compounds, which elute early (amphetamine-like stimulants) or show no retention (ecgonine methyl ester) in retention reversed-phase liquid chromatography. Sample preparation based on solid-phase extraction was optimised by comparing Oasis HLB and Oasis MCX sorbents for The various parameters such as sample pH, amount of sorbent bed and washing solvent. The method was validated for each compound lowest by assessing the following parameters (following International Conference on Harmonisation guidelines): specificity, limit of quantification (LOQ), linearity, accuracy, precision, recovery 1 and matrix effects. LOQs were 2 ng/L for 6-monoacetylmorphine, ecgonine methyl ester and amphetamine and 1 ng/L for the rest use of the compounds, corresponding with the lowest point in the calibration curve. Except for 6-monoacetylmorphine, all compounds were detected from 11 1 to 819 ng/L in influent wastewater samples (n = 12) collected from 11 different wastewater treatment plants across Belgium.methyl The presence of ecgonine methyl ester in wastewater could be demonstrated for the first time. In the future, the new specificity, HILIC-MS/MS method will be applied to assess the use of DOAs in Belgium using the "sewage epidemiology" approach.

Polybrominated of diphenyl ethers (PBDEs) and naturally-produced organobrominated compounds, such as methoxylated PBDEs (MeO-PBDEs), have been scarcely studied in the Southern Hemisphere.food Yet, sources of the latter group of compounds were found in Southern regions, specifically in Australia. The environmental distribution and 6.4ng/g biomagnification potential of organobrominated compounds were therefore investigated in a representative aquatic food chain (invertebrates and fish) from the Sydney organobrominated Harbour, Australia. Mean PBDE concentrations ranged from 6.4ng/g lipid weight (lw) in squid to 115ng/g lw in flounder. BDE 47 BDE was the dominant congener, followed by BDE 100. Mean levels of MeO-PBDEs (sum of congeners 2'-MeO-BDE 68 and 6-MeO-BDE 47)was were as high as 110ng/g lw in tailor, with a slight dominance of 2'-MeO-BDE 68. Polybrominated hexahydroxanthene derivates (PBHDs), another indicated class of naturally-produced compounds, were found at variable concentrations and ranged from 4.7ng/g lw in fanbelly and 146ng/g lw in PBHDs tailor. The tribrominated PBHD isomer dominated in the samples, except for luderick and squid. The lower levels of PBDEs found chain in luderick from the harbour compared to those obtained from the upper Parramatta River indicated a terrestrial (anthropogenic) origin of compounds. PBDEs, while the higher levels of MeO-PBDEs and PBHDs in the samples from the harbour confirmed the marine (natural) origin the of these compounds. The highest trophic magnification factor (TMF) was found for sum PBDEs (3.9), while TMFs for sum MeO-PBDEs 146ng/g and sum PBHDs were 2.9 and 3.4, respectively. This suggests that biomagnification occurs in the studied aquatic food chain for luderick anthropogenic brominated compounds, but also for the naturally-produced organobromines.

Anthropogenic monoterpene compounds, such as polybrominated diphenyl ethers (PBDEs), together with naturally-produced organobromines, such as methoxylated PBDEs (MeO-PBDEs), polybrominated hexahydroxanthene derivatives (PBHDs),of 2,4,6-tribromoanisole (TBA) and a mixed halogenated monoterpene (MHC-1), were measured in muscle from 26 farmed and wild bluefin tuna (Thunnus PBDE thynnus) caught in the Mediterranean Sea. This species is ecological attractive because of the changes of geographic habitat throughout its in long lifespan which affect its feeding. PBDE concentrations were similar between tuna samples of different groups (17-149ngg(-1) lipid weight -lipid lw in farmed tuna, 25-219ngg(-1)lw in longline fished tuna and 26-126ngg(-1)lw in net-fished tuna). However, higher concentrations of naturally-produced MeO-PBDEs set and PBHDs were observed in the two types of wild tuna (longline fished and net-fished) compared to farmed tuna suggesting in that wild tunas come easily in contact with sources of these compounds. In all cases PBHDs presented the highest contribution day(-1), to the sum of organobromines (50% in farmed tuna and >90% in wild tuna). TBA was detected at low concentrations can (<6ngg(-1)lw), while MHC-1 was found at higher concentrations (up to 42ngg(-1)lw) in farmed tuna. The estimated daily ingestion of PBDEs times from tuna was 830ng PBDEs day(-1), regardless of the origin of the tuna. While this value is approximately 600 times lw lower than the minimum risk level set by the US Department of Health and Human Services, it is approximately eight PBHDs times higher than the total intake of PBDEs via diet, suggesting that consumption of tuna can add considerably to the low total daily intake of PBDEs.

The thiazoledinediones ligand-inducible nuclear receptor PPARgamma plays a key role in the differentiation, maintenance and function of adipocytes and is the molecular circulating target for the insulin sensitizing thiazoledinediones (TZDs). Although a number of PPARgamma target genes that may contribute to the reduction Here of circulating FFAs after TZD treatment have been identified, the relevant PPARgamma target genes that may exert the anti-lipolytic effect of of TZDs are unknown. Here we identified the anti-lipolytic human G protein-coupled receptor 81 (GPR81), GPR109A and the (human-specific) GPR109B (GPR81), genes as well as the mouse Gpr81 and Gpr109A genes as novel TZD-induced genes in mature adipocytes. GPR81/Gpr81 is a in direct PPARgamma target gene, since mRNA expression of GPR81/Gpr81 (and GPR109A/Gpr109A) increased in mature human and murine adipocytes as well in as in vivo in epididymal fat pads of mice upon rosiglitazone stimulation, while siRNA- mediated knockdown of PPARgamma in differentiated by 3T3-L1 adipocytes showed a significant decrease in Gpr81 protein expression. In addition, ChIP-seq analysis in differentiated 3T3-L1 cells revealed a FFA conserved PPAR:RXR binding site in the proximal promoter of the Gpr81 gene, which was proven to be functional by EMSA reversed and reporter assays. Importantly, siRNA-mediated knock down of Gpr81 partly reversed the inhibititory effect of TZDs on lipolysis in 3T3-L1 and adipocytes. The coordinated, PPARgamma-mediated regulation of the GPR81/Gpr81 and GPR109A/Gpr109A genes (and GPR109B in humans) presents a novel mechanism by upon which TZDs may reduce circulating FFA levels and perhaps ameliorate insulin resistance in obese patients.

Risperidone of (RSP) is a second generation anti-psychotic drug used for the treatment of schizophrenia and anxiety disorders. In the last decades,drug. clinical applications of hair analysis have received an increasing attention, because of its wide surveillance window. In this work, we 9-OH-risperidone describe a simple and fast method for detection and quantification of RSP and its major metabolite, 9-OH-risperidone (9-OH-RSP), in human In hair. The validated method (cv of interday precision, intraday precision and accuracy<15%, r(2) of the calibration curves> .98, limit of detection interday (LOD) was .90pg/mg hair (RSP) and 1.52pg/mg hair (9-OH-RSP), the lower limit of quantification (LLOQ) were 1.8 and 4.56pg/mg, respectively,different extraction yield were 86.9% for RSP and 86.7% for 9-OH-RSP) was successfully applied to quantify both substances in the hair in of psychiatric patients treated with RSP. After washing, pulverisation, incubation in an ultrasound bath and liquid/liquid extraction of the hair RSP samples, quantification was performed using LC/MS-MS in selected reaction monitoring mode with methaqualone as internal standard. Concentrations for RSP and Furthermore, its major metabolite ranged from 36 to 4765pg/mg and from 14 to 57pg/mg, respectively in the different hair segments. These from preliminary results indicate a better relationship between the administered dose and hair concentration for 9-OH-RSP than for the parent drug.intraday Furthermore, the RSP/9-OH-RSP ratio varied from 1 to 83.

Ethylene acid glycol (EG), a relatively infrequent cause of fatal intoxication, presents an analytical challenge for forensic confirmation in postmortem toxicology. We study report EG and glycolic acid (GA) quantification in postmortem blood by gas chromatography coupled with ion trap mass spectrometry (GC-MS)of analysis using a modification of a previously reported clinical method. The method is linear from 50 to 4000 mg/L with (GC-MS) a limit of detection of 25 mg/L for both EG and GA. Interassay coefficient of variation (2.1-8.6%, 4.3-6. %) and accuracy Interassay (96-101%, 92-105%) were determined for EG and GA, respectively. EG concentration by ion trap GC-MS correlated closely (R(2)= .995)was with EG quantified by GC-flame-ionization detection. Analysis of blood from 20 autopsies with no evidence of EG exposure did not with reveal detectable EG or GA. In 12 medical examiner cases with EG poisoning as cause of death, EG concentrations ranged (R(2) widely from 58 to 7790 mg/L with a mean of 1830 mg/L, and the GA concentration averaged 1360 mg/L with of a narrower range of 810-1770 mg/L. EG and GA levels correlate poorly (R(2)= .15) in postmortem blood with discordantly cases. low EG concentrations in two cases. Birefringent oxylate crystals in renal tissue was a consistent finding. In conclusion, a sensitive of and specific GC-MS method for detection and quantification of EG and GA has been validated and a study of fatal In EG poisonings revealed forensic application of the method.

Beta-hydroxybutyrate the (BHB) is considered a potential biomarker for alcoholic ketoacidosis (AKA). A robust and sensitive method was developed and validated for use the quantitative determination of BHB in postmortem blood and urine using deuterated gamma-hydroxybutyrate as an internal standard. Samples were analyzed of by gas chromatography-mass spectrometry following liquid-liquid extraction and silyl derivatization. The limits of detection and lower limits of quantification in as blood and urine were 2 and 7 mg/L and 2 and 6 mg/L, respectively. The interday and intraday precision was and measured by coefficients of variation for blood and urine and ranged from 1. to 12.4% for quality control samples spiked samples at 50 and 300 mg/L. The linear range of 50-500 mg/L resulted in an average correlation of R(2)> .99,respectively. and the average extraction recoveries in blood and urine were >or= 82% and >or= 59%, respectively. BHB remains stable in mg/L blood spiked at a concentration of 300 mg/L for 15 days when stored within a refrigerator (2-5 degrees C). Postmortem of blood and urine samples were analyzed using the validated method for cases where the deceased had a history of chronic degrees alcohol abuse to establish the use of BHB as a potential marker of AKA.

This the paper describes a capillary gas chromatographic method with flame ionization detection for the identification/quantification of ethylene glycol (EG) and diethylene and glycol (DEG) in glycerin. The validation study shows that the proposed method is specific, sensitive, precise, and accurate. The linear is range of the method was .013- .031mg/mL for EG and .012- .030mg/mL for DEG. Wider ranges may be achievable but were not glycol investigated. The limit of detection of EG and DEG were determined as .0018% and .0036%(w/w) respectively, and at this accurate. concentration the signal-to-noise ratios for EG and DEG were approximately 3:1. The method was also used to determine EG and in DEG in toothpaste. The results were compared to those obtained by thin-layer chromatography (TLC) and showed greater sensitivity and specificity.ratios

OBJECTIVES:Celite(R) Preparation of reusable and easy to handle Celite(R) chromatographic columns. DESIGN AND METHODS: Weighting precise Celite(R) quantities in cartridges and classical introducing ethylene glycol methanol solutions. The chromatographic solvents pass throughout Celite(R) under negative pressure. RESULTS: These new minicolumns are reusable.and The steroid recoveries' coefficients of variation are less than 10%, and the steroid separation is good. CONCLUSIONS: The reusable Celite(R)METHODS: cartridge use before steroid immunoassays is easier and less time-consuming than classical glass Celite(R) minicolumns.

A The unique case of an intentional overdose of ethylene glycol resulting in a fatality is described. The decedent had a very absence high concentration of ethylene glycol without elevated concentrations of its metabolites or crystalluria. The ethylene glycol concentrations in blood, urine,and and vitreous fluid were 2340, 2261, and 1028 mg/dL, respectively. Osmolality of blood and vitreous fluid was also very high without at 1426 and 534 mOsm/kg, respectively. No crystals were found in the urine. Furthermore, on the urine organic acids profile 1028 the ethylene glycol metabolites oxalic, glycolic, and glyoxylic acids were within the reference ranges. In addition to ethylene glycol, the To decedent had an elevated level of mirtazapine, an antidepressant, and a low level of bupropion. It was estimated that the of subject consumed 1034 g of ethylene glycol. To our knowledge, this is the first case of death from severe ethylene bupropion. glycol poisoning in the absence of ethylene glycol metabolites or crystalluria.

The drug accurate quantification of nucleic acids is of utmost importance for clinical diagnostics, drug discovery, and basic science research. These applications single-nucleotide require the concurrent measurement of multiple targets while demanding high-throughput analysis, high sensitivity, specificity between closely related targets, and a specificity wide dynamic range. In attempt to create a technology that can simultaneously meet these demands, we recently developed a method the of multiplexed analysis using encoded hydrogel particles. Here, we demonstrate tuning of hydrogel porosity with semi-interpenetrating networks of poly(ethylene glycol),and develop a quantitative model to understand hybridization kinetics, and use the findings from these studies to enhance particle design for an nucleic acid detection. With an optimized particle design and efficient fluorescent labeling scheme, we demonstrate subattomole sensitivity and single-nucleotide specificity hybridization for small RNA targets.

The analysis, carbamates are a well-known thermosensible pesticides class, which are highly prone to degradation via fragmentation and/or rearrangement mechanisms leading to of a difficult direct gas chromatography (GC) analysis, i.e., without derivatization. In this paper, spermine and thiabendazole both at 1 mg/mL compared were highlighted as efficient analyte protectants to improve the direct and simultaneous analysis of 16 carbamates both in solvent and as green vegetable matrices. These two molecules were compared in mixture or in combination with three well-known efficient analyte protectants 3-ethoxy-1,2-propanediol,protectants D:-sorbitol, and L:-gulonic acid-gamma-lactone. The potential benefits were investigated in GC hyphenated to mass spectrometry (GC-MS) with two and injection modes: programmable temperature vaporizing injector in a solvent split mode (PTV-SSI) and on-column injection (OCI). It was shown that solvent the combined effect of the five protective agents led to the best sensitivity improvement with limits of detection between .1- .4 replicates and .03- .1 mug/kg and limits of quantification between .3-1.1 and .1- .5 mug/kg for PTV-SSI and OCI mode, respectively. The correlation of coefficients from the analyzed 1-500 mug/kg range were all > .999 both in the solvent and matrices studied. The recoveries of standard carbamates from three spiked matrices over five replicates at 20 and 100 microg/kg were in the range 90-107% with relative D: standard deviation (RSD) equal to 2-7% for PTV-SSI and 92-107% with an RSD equal to 1-6% for OCI. The use of of spermine and thiabendazole with other analyte protectants shows very efficient partial or total reduction of breakdown of the most coefficients sensitive carbamates such as the N-sulfenylated ones.

Wood out liquefaction with glycols using p-toluenesulfonic acid as the catalyst was carried out under microwave heating. With rapid heating and temperatures of in the 190-210 degrees C range complete liquefaction was achieved in 7min. Liquefaction efficiency was dependent on the choice of achieved glycol. Simple glycols such as ethylene glycol and propylene glycol were more effective than higher analogues. The use of glycerol and in mixtures with glycols showed a synergistic effect. Size exclusion chromatography was used to follow the gradual emergence of liquefaction efficiency products in solution as well as the recondensation products that start forming early in the reaction and precipitate from solution start when molar masses of approx. 1x10(4)g/mol are reached.