Results 131 to 140 of about 130,892 (321)

Aplicação da cromatografia gasosa bidimensional abrangente com microdetector de captura de elétrons para determinação de agrotóxicos em sedimentos

Química Nova, 2011
Analysis of seven pesticides in sediments was successfully achieved using comprehensive two-dimensional gas chromatography with micro-electron capture detection, as it provided higher sensitivity and less matrix interference.
Juliana Macedo da Silva, Cláudia Alcaraz Zini, Elina Bastos Caramão   +2 more
doaj   +1 more source

Reporting the limits of detection and quantification for environmental DNA assays

Environmental DNA, 2020
Background Environmental DNA (eDNA) analysis is increasingly being used to detect the presence and relative abundance of rare species, especially invasive or imperiled aquatic species. The rapid progress in the eDNA field has resulted in numerous studies
Katy E. Klymus, Christopher M. Merkes, Michael J. Allison, Caren S. Goldberg, Caren C. Helbing, Margaret E. Hunter, Craig A. Jackson, Richard F. Lance, Anna M. Mangan, Emy M. Monroe, Antoinette J. Piaggio, Joel P. Stokdyk, Chris C. Wilson, Catherine A. Richter   +13 more
doaj   +1 more source

Validated UPLC-MS/MS methods to quantitate free and conjugated Alternaria toxins in commercially available tomato products and fruit and vegetable juices in Belgium [PDF]

, 2016
Ultraperformance liquid chromatography tandem mass spectrometry and Quick, Easy, Cheap, Effective, Rugged, and Safe based analytical methodologies to quantitate both free (alternariol (1), alternariol monomethyl ether (2), tenuazonic acid (3), tentoxin ...
Asam, Stefan, De Saeger, Sarah, Devos, Tom, Diana Di Mavungu, José, Jacxsens, Liesbeth, Mikula, Hannes, Njumbe Ediage, Emmanuel, Rychlik, Michael, Van Landschoot, Anita, Vanhaecke, Lynn, Walravens, Jeroen   +10 more
core   +3 more sources

Machine Learning–Enhanced Fluorescence Cryptography with NADH‐Responsive Polymer Dots

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
This study presents a smart anticounterfeiting system using semiconducting polymer dots (Pdots) that exhibit tunable fluorescence responses to NADH. By integrating these dynamic optical signals with machine learning–based decoding, the work establishes a secure and intelligent encryption platform, showing a novel strategy that links chemical sensing ...
Zhengkun Zhan, Mingyue Gong, Zirui Zeng, Hangyu Liu, Xiaoliang Li, Zhuxin Dong, Xiaoju Men, Haobin Chen   +7 more
wiley   +1 more source

Comparative statistical evaluation of greenness, blueness, and whiteness spectrophotometric methods for dexamethasone and chloramphenicol estimation

Scientific Reports
Five sustainable and validated UV spectrophotometric methods were developed for analyzing chloramphenicol (CHL) and dexamethasone sodium phosphate (DSP) in pure and ophthalmic dosage forms. CHL was detected by zero order spectra method at 292.0 nm in the
Heidi R. Abd El-Hadi
doaj   +1 more source

Derivative spectrophotometric method for determination of acyclovir in polymeric nanoparticles

Química Nova, 2012
A derivative spectrophotometric method was validated for quantification of acyclovir in poly (n-butylcyanoacrylate) (PBCA) nanoparticles. Specificity, linearity, precision, accuracy, recovery, detection (LOD) and quantification (LOQ) limits were ...
Guilherme Diniz Tavares, Gisele Miki Ishikawa, Talita Ferreira Monteiro, Carolina Zanolini, Érika Rosa Maria Kedor-Hackmann, Nádia Araci Bou-Chacra, Vladi Olga Consiglieri   +6 more
doaj   +1 more source

Stir Bar Sorptive Extraction of Volatile Compounds in Vinegar: Validation Study and Comparison With Solid Phase Microextraction [PDF]

, 2007
Stir bar sorptive extraction was evaluated for analysing volatiles in vinegar. The procedure developed shows detection and quantitation limits, and linear ranges adequate for analysing this type of compounds. The accuracy obtained was close to 100%, with
Alves, Baltussen, Bicchi, Blanch, Buettner, Carmelo García Barroso, Demyttenaere, Durán, Edwards, Enrique Durán Guerrero, García, García-Falcón, Hayasaka, Isogai, León, Luan, Luan, Marín, Natera, Noble, Palacios, Quirós, Ramón Natera Marín, Rapp, Remedios Castro Mejías, Zalacain   +25 more
core   +2 more sources

Determination of Monoethylene Glycol in Gas Condensate Samples by Microchip Micellar Electrokinetic Chromatography Integrated With Capacitively Coupled Contactless Conductivity Detection

ELECTROPHORESIS, EarlyView.
ABSTRACT This study describes the use of microchip micellar electrokinetic chromatography (MEKC) integrated with capacitively coupled contactless conductivity detection (C4D) for the determination of monoethylene glycol (MEG) in gas condensate samples.
Maurício M. L. Pereira, Kariolanda C. A. Rezende, Iris Medeiros Junior, Bruno Charles do Couto, Rogerio M. Carvalho, Claudimir L. do Lago, Wendell K. T. Coltro   +6 more
wiley   +1 more source

Corrigendum: Detection of Aflatoxins in Different Matrices and Food-Chain Positions

Frontiers in Microbiology, 2021
Gabriella Miklós, Cserne Angeli, Árpád Ambrus, Attila Nagy, Valéria Kardos, Andrea Zentai, Kata Kerekes, Zsuzsa Farkas, Ákos Józwiak, Tibor Bartók   +9 more
doaj   +1 more source

Extração de ácido trans-trans mucônico urinário com polímeros de impressão molecular e análise por cromatografia gasosa: espectrometria de massas

Química Nova, 2012
This paper describes selective molecularly imprinted solid-phase extraction of ttMA from urine samples followed by derivatization and analysis by gas chromatography/mass spectrometry (GC/MS). The analytical calibration curve ranged from 0.3 to 7.0 mg L-1
Lidiane Silva Franqui, André Coutinho Vieira, Patrícia Penido Maia, Eduardo Costa Figueiredo   +3 more
doaj   +1 more source