.... http://www.separationsNOW.com/coi/cda/landing.cda?type=Feature&chId=4 http://www.separationsNOW.com/coi/cma/download.cma?imageType=RssLogo&contentType=Feature&siteId=2&chId=4 http://www.separationsNOW.com/coi http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=23188&type=Feature&page=1 The amount of sheep's milk fraudulently present in cheeses made primarily from cows' or goats' milk can be estimated by liquid chromatography-tandem mass spectrometry of casein fragments, say Italian researchers. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=23014&type=Feature&page=1 This review will provide a brief overview of acetylcholine biosynthesis, microdialysis technique and liquid chromatography-mass spectrometry, which is being used to quantitate extracellular levels of acetylcholine. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=23083&type=Feature&page=1 The key health beneficial polyphenols in ready-to-drink teas have been measured by HPLC, providing a means of quality control and a basis for backing up nutritional claims by the producers. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22976&type=Feature&page=1 The enantiomers of hesperetin, a flavanone found in conjugated form in citrus fruits, have been resolved and measured in urine after the consumption of orange juice, using nano-LC with a chiral column. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22893&type=Feature&page=1 The development of LC/MS and tandem MS/MS for the analysis of bioactive components and their metabolites of herbal medicines in biological fluids is reviewed to provide an overview of the current techniques and methods. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22895&type=Feature&page=1 Burning barbecue charcoal emits a series of aromatic hydrocarbons and aldehydes, say Korean researchers, which are potential health risks to humans, especially during indoor combustion as in Asian barbecue restaurants. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22807&type=Feature&page=1 An HPLC-DAD procedure for measuring the principle cannabinoids in cannabis plants has been developed by modelling the chromatographic responses to achieve the optimal separation conditions. The method can be used to estimate the psychoactive potency and for quality control of medicinal samples. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22699&type=Feature&page=1 Within liquid chromatography at the critical condition, the thermodynamic significance of the conditions and the influence of column pore size on the determination of critical conditions for linear polymer chains were determined. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22779&type=Feature&page=1 A recently developed HPLC system that combines fractionation with sensory analysis has been used to characterise flavour-modulating compounds such as sweet enhancers in complex food matrices. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22655&type=Feature&page=1 Impurities in the carbohydrate drug heparin, one of which is potentially lethal, can be characterised by HPLC-NMR using a weak anion exchange column, say US researchers. The technique could be used as the next step when routine quality assurance HPLC-UV or CE-UV tests show unexpected peaks. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22541&type=Feature&page=1 HPLC and UPLC were evaluated for the determination of two hydrophobic and four hydrophilic sunscreen agents in a single run for the quality control of suncare products. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22567&type=Feature&page=1 A common germicide has been determined in multipurpose contact lens solutions by HPLC with evaporative light scattering detection at low ppm levels, say US researchers. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22507&type=Feature&page=1 The adulteration of bovine milk with soy milk can be detected by HPLC by looking for the presence of the soy sugar stachyose, which is absent from bovine milk, say Indian researchers. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22363&type=Feature&page=1 The in vitro elution of 2-hydroxyethyl methacrylate (HEMA) from two different adhesive systems, used in two dual polymerized resin cements for bonding of ceramic restoration, was determined by HPLC. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22422&type=Feature&page=1 The main components of vanilla pods have been measured by two research groups, both of which compared two HPLC methods with UV detection. The best sensitivity was achieved by ultra-high pressure LC with a reversed-phase column, which delivered detection limits at the picogram level. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22346&type=Feature&page=1 The antibiotics sulfamethoxazole and trimethoprim, which are administered in combination to cows, have been measured in bovine milk by HPLC with amperometric detection. A dual-column method enables untreated samples to be cleaned up online without damage to the column or the boron-doped diamond electrodes. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22204&type=Feature&page=1 A method for the analysis of free and total tryptophan in bee pollen and royal jelly employed HPLC with fluorescence detection following ultrasonic extraction and alkaline hydrolysis, respectively. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22228&type=Feature&page=1 The performance-enhancing drug testosterone undecanoate has been detected in human hair by LC/MS using atmospheric pressure chemical ionisation, at detection limits at least five-fold lower than published GC/MS methods. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22192&type=Feature&page=1 Red inks used for document seals can be differentiated by HPLC of the dye components and GC/MS of the volatiles, say Chinese researchers. The results will help to classify and date seals and uncover amended and forged documents. http://www.separationsNOW.com/coi/cda/detail.cda?chId=4&id=22073&type=Feature&page=1 A reliable HPLC fingerprint method coupled with principal component analysis and similarity evaluation was developed to differentiate between the three medicines <em>Pericarpium Citri Reticulatae, Pericarpium Citri Reticulatae Viride</em> and <em>Fructus Aurantii</em>.