Tag Archives: HPLC

Use of onion extract as a dairy cattle feed supplement: monitoring propyl propane thiosulfonate as a marker of its effect on milk attributes.

Posted on 28 February, 2017 by fqm302

Onion extract is used as a feed supplement for the diet of dairy cows, acting as inhibitor of methane production; however, its properties could alter sensory attributes of milk. In this work, we propose a method to evaluate the influence … Continue reading →

Posted in Animal feed, HPLC, PTSO, QuEChERS, UV-vis | Tagged , , | Comments Off on Use of onion extract as a dairy cattle feed supplement: monitoring propyl propane thiosulfonate as a marker of its effect on milk attributes.

High-throughput methodology for the determination of carbamates in food supplements by UHPLC–MS/MS.

Posted on 28 February, 2017 by fqm302

Food supplements are increasingly consumed products that claim to have several benefits for health. In many cases, these supplements contain herbal products and, as a consequence, can be contaminated with pesticides used in crops. This study aimed to use a … Continue reading →

Posted in AGL2015-70708-R, Carbamates, Mass spectrometry, QuEChERS, Supplements, UHPLC | Tagged , , | Comments Off on High-throughput methodology for the determination of carbamates in food supplements by UHPLC–MS/MS.

Evaluation of a new modified QuEChERS method for the monitoring of carbamate residues in high-fat cheeses by using UHPLC–MS/MS.

Posted on 27 February, 2017 by fqm302

A simple and efficient method for the determination of 28 carbamates in high-fat cheeses is proposed. The methodology is based on a modified quick, easy, cheap, effective, rugged, and safe procedure as sample treatment using a new sorbent (Z-Sep+) followed … Continue reading →

Posted in Carbamates, Cheese, Mass spectrometry, P12-AGR-1647, QuEChERS, UHPLC | Tagged , , | Comments Off on Evaluation of a new modified QuEChERS method for the monitoring of carbamate residues in high-fat cheeses by using UHPLC–MS/MS.

Determination of aflatoxins in yogurt by dispersive liquid – liquid microextraction and HPLC with photo-induced fluorescence detection.

Posted on 16 January, 2017 by fqm302

A high-performance liquid chromatography (HPLC) method with fluorescence detection for the determination of aflatoxins B1, B2, G1, G2, and M1 in yogurt using dispersive liquid–liquid microextraction as alternative sample treatment has been developed. To enhance the fluorescence of aflatoxins B1 … Continue reading →

Posted in AGL2015-70708-R, Aflatoxins, DLLME, HPLC, P12-AGR-1647, Photo-induced, Yogurt | Tagged , | Comments Off on Determination of aflatoxins in yogurt by dispersive liquid – liquid microextraction and HPLC with photo-induced fluorescence detection.

Method optimization and validation for the determination of eight sulfonamides in chicken muscle and eggs by modified QuEChERS and liquid chromatography with fluorescence detection

Posted on 10 March, 2016 by fqm302

A simple, effective and reliable method for the determination of eight sulfonamide antibiotics (sulfadiazine, sulfapiridine, sulfamerazine, sulfamethazine, sulfachloropiridazine, sulfamethoxazole, sulfadoxine, sulfadimethoxin) in chicken muscle and eggs by liquid chromatography and fluorescence detection has been developed and validated. Sulfonamides do not … Continue reading →

Posted in Chicken muscle, Eggs, Fluorescence, P12-AGR-1647, QuEChERS, Sulfonamides | Tagged | Comments Off on Method optimization and validation for the determination of eight sulfonamides in chicken muscle and eggs by modified QuEChERS and liquid chromatography with fluorescence detection

Hollow-fiber liquid-phase microextraction combined with capillary HPLC for the selective determination of six sulfonylurea herbicides in environmental waters

Posted on 15 October, 2013 by fqm302

A three-phase hollow-fiber liquid-phase microextraction combined with a capillary LC method using diode array detection was proposed for the determination of six sulfonylurea herbicides, triasulfuron, metsulfuron-methyl, chlorsulfuron, flazasulfuron, chlorimuron-ethyl, and primisulfuron-methyl, in environmental water samples. Different factors that can affect … Continue reading →

Posted in Capillary HPLC, Hollow-fiber liquid-phase microextraction, Sulfonylurea, UV-vis, Water | Tagged , , | Comments Off on Hollow-fiber liquid-phase microextraction combined with capillary HPLC for the selective determination of six sulfonylurea herbicides in environmental waters

Ultrasound-assisted surfactant-enhanced emulsification microextraction for the determination of carbamates in wines by ultra-high performance liquid chromatography–tandem mass spectrometry

Posted on 14 October, 2013 by fqm302

A new sensitive multiresidue method based on ultra-high performance liquid chromatography–tandem mass spectrometry (UHPLC–MS/MS) has been developed for the detection, confirmation and quantification of twenty five carbamates in wine samples. The separation was achieved in 5.5 min, using a Zorbax Eclipse … Continue reading →

Posted in Carbamates, Mass spectrometry, UASEME, UHPLC, Wine | Tagged , | Comments Off on Ultrasound-assisted surfactant-enhanced emulsification microextraction for the determination of carbamates in wines by ultra-high performance liquid chromatography–tandem mass spectrometry

On-line anion exchange solid-phase extraction coupled to liquid chromatography with fluorescence detection to determine quinolones in water and human urine

Posted on 5 September, 2013 by fqm302

An analytical method based on on-line solid-phase extraction coupled to liquid chromatography with fluorescence detection has been developed to determine quinolones in tap water and human urine. A home-made setup was used to percolate 10 mL of sample through a solid-phase … Continue reading →

Posted in Fluorescence, Quinolones, Urine, Water, on-line SPE | Tagged , | Comments Off on On-line anion exchange solid-phase extraction coupled to liquid chromatography with fluorescence detection to determine quinolones in water and human urine

Alternative sample treatments for the determination of sulfonamides in milk by HPLC with fluorescence detection

Posted on 3 September, 2013 by fqm302

This paper presents two sample treatments, dispersive liquid–liquid microextraction (DLLME) and QuEChERS for the determination of 9 sulfonamides, regulated by the EU Council in milk samples. Both methods represent useful alternatives to conventional procedures based mainly in solid-phase extraction, in … Continue reading →

Posted in DLLME, Fluorescence, Milk, QuEChERS, Sulfonamides | Tagged | Comments Off on Alternative sample treatments for the determination of sulfonamides in milk by HPLC with fluorescence detection

Advances in the determination of β-lactam antibiotics by liquid chromatography

Posted on 15 August, 2012 by fqm302

β-lactam antibiotics have been the most widely used antimicrobial drugs for more than 80 years and still constitute the most important group of antibiotics. Their extensive use in veterinary medicine practices as growth promoters, and chemotherapeutic and/or prophylactic agents causes numerous … Continue reading →

Posted in Antibiotics, Chromatography, Drugs, Review, β-lactams | Tagged , | Comments Off on Advances in the determination of β-lactam antibiotics by liquid chromatography