Search results for: Inês C. Santos

Items from 1 to 15 out of 15 results

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Recent developments in the characterization of nucleic acids by liquid chromatography, capillary electrophoresis, ion mobility, and mass spectrometry (2010–2020)

Inês C. Santos, Jennifer S. Brodbelt

Journal of Separation Science > 44 > 1 > 340 - 372

The development of new strategies for the analysis of nucleic acids has gained momentum due to the increased interest in using these biomolecules as drugs or drug targets. The application of new mass spectrometry ion activation techniques and the optimization of separation methods including liquid chromatography, capillary electrophoresis, and ion mobility have allowed more detailed characterization...

article

Convolutional neural network for preprocessing‐free bacterial Spectra identification

Younghoon Kim, Jiyoon Lee, Gonie Ahn, Inês C. Santos, more

Journal of Chemometrics > 34 > 11 > n/a - n/a

Identifying bacterial species is essential to epidemiological surveillance. However, the determination of bacterial species is a tedious and labor‐intensive process. Various machine learning methods have been used for identifying bacterial species with mass spectral fingerprints. Although machine learning methods achieve real‐time identification without human experts, it still requires data preprocessing...

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Exploring the links between groundwater quality and bacterial communities near oil and gas extraction activities

Inês C. Santos, Misty S. Martin, Michelle L. Reyes, Doug D. Carlton, more

Science of The Total Environment > 2018 > 618 > C > 165-173

Bacterial communities in groundwater are very important as they maintain a balanced biogeochemical environment. When subjected to stressful environments, for example, due to anthropogenic contamination, bacterial communities and their dynamics change. Studying the responses of the groundwater microbiome in the face of environmental changes can add to our growing knowledge of microbial ecology, which...

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Rapid Profiling and Authentication of Vanilla Extracts Using Gas Chromatography-Vacuum Ultraviolet Spectroscopy

Inês C. Santos, Jonathan Smuts, Kevin A. Schug

Food Analytical Methods > 2017 > 10 > 12 > 4068-4078

Vanilla extracts are widely used as flavoring ingredients in foods, beverages, perfumes, and pharmaceuticals. Due to the high cost of producing high-quality natural extracts, artificial flavorings, such as ethyl vanillin and coumarin, are often used. For food safety and to ensure high-quality products, it is important to differentiate between natural and artificial extracts. In this work, gas chromatography-vacuum...

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Recent advances and applications of gas chromatography vacuum ultraviolet spectroscopy

Inês C. Santos, Kevin A. Schug

Journal of Separation Science > 40 > 1 > 138 - 151

The vacuum ultraviolet spectrophotometer was developed recently as an alternative to existing gas chromatography detectors. This detector measures the absorption of gas‐phase chemical species in the range of 120–240 nm, where all chemical compounds present unique absorption spectra. Therefore, qualitative analysis can be performed and quantification follows standard Beer–Lambert law principles. Different...

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Corrigendum to “Use of solid phase extraction for the sequential injection determination of alkaline phosphatase activity in dynamic water systems” [Talanta 98 (2012) 203–210]

Inês C. Santos, Raquel B.R. Mesquita, Adriano A. Bordalo, António O.S.S. Rangel

Talanta > 2016 > 146 > Complete > 857

article

Paired-ion electrospray ionization – triple quadrupole tandem mass spectrometry for quantification of anionic surfactants in waters

Inês C. Santos, Hongyue Guo, Raquel B.R. Mesquita, António O.S.S. Rangel, more

Talanta > 2015 > 143 > C > 320-327

A new paired ion electrospray ionization tandem mass spectrometry method for determination of anionic surfactants in water samples was developed. In this method, dicationic ion-pairing reagents were complexed with monoanionic analytes to facilitate analyte detection in positive mode electrospray ionization – mass spectrometry. Single ion monitoring and selected reaction monitoring on a triple quadrupole...

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Screening of cadmium and lead in potentially contaminated waters using a spectrophotometric sequential injection lab-on-valve methodology

Inês C. Santos, Raquel B.R. Mesquita, António O.S.S. Rangel

Talanta > 2015 > 143 > C > 359-365

The present work describes the development of a µSI-LOV method for the simultaneous screening of cadmium and lead in potentially contaminated water samples. To attain the biparametric determination, dithizone was chosen as the spectrophotometric reagent as it forms a colored complex with both metal ions, at different pH conditions. The cadmium determination was attained in strong alkaline conditions...

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Micro solid phase spectrophotometry in a sequential injection lab-on-valve platform for cadmium, zinc, and copper determination in freshwaters

Inês C. Santos, Raquel B.R. Mesquita, António O.S.S. Rangel

Analytica Chimica Acta > 2015 > 891 > C > 171-178

This work describes the development of a solid phase spectrophotometry method in a μSI-LOV system for cadmium, zinc, and copper determination in freshwaters. NTA (Nitrilotriacetic acid) beads with 60–160 μm diameter were packed in the flow cell of the LOV for a μSPE column of 1 cm length. The spectrophotometric determination is based on the colourimetric reaction between dithizone and the target metals,...

article

Iodine speciation in coastal and inland bathing waters and seaweeds extracts using a sequential injection standard addition flow-batch method

Inês C. Santos, Raquel B.R. Mesquita, Adriano A. Bordalo, António O.S.S. Rangel

Talanta > 2015 > 133 > C > 7-14

The present work describes the development of a sequential injection standard addition method for iodine speciation in bathing waters and seaweeds extracts without prior sample treatment. Iodine speciation was obtained by assessing the iodide and iodate content, the two inorganic forms of iodine in waters. For the determination of iodide, an iodide ion selective electrode (ISE) was used. The indirect...

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Determination of Noncovalent Binding Using a Continuous Stirred Tank Reactor as a Flow Injection Device Coupled to Electrospray Ionization Mass Spectrometry

Inês C. Santos, Veronica B. Waybright, Hui Fan, Sabra Ramirez, more

Journal of The American Society for Mass Spectrometry > 2015 > 26 > 7 > 1204-1212

Described is a new method based on the concept of controlled band dispersion, achieved by hyphenating flow injection analysis with ESI-MS for noncovalent binding determinations. A continuous stirred tank reactor (CSTR) was used as a FIA device for exponential dilution of an equimolar host-guest solution over time. The data obtained was treated for the noncovalent binding determination using an equimolar...

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Application of Mid- and Near-Infrared Spectroscopy for the Control and Chemical Evaluation of Brine Solutions and Traditional Sea Salts

Andrea C. Galvis-Sánchez, Inês C. Santos, Raquel B. R. Mesquita, João A. Lopes, more

Food Analytical Methods > 2013 > 6 > 2 > 470-480

Mid- and near-infrared spectroscopy methodologies were explored for the analysis of brine solutions and traditional sea salt samples. Brine solutions from different salt pans, corresponding to different stages of sodium chloride crystallisation, were collected. A total of 61 dried and non-dried traditional sea salts were also analysed. Partial least squares regression with leave-one-out cross-validation...

article

Use of solid phase extraction for the sequential injection determination of alkaline phosphatase activity in dynamic water systems

Inês C. Santos, Raquel B.R. Mesquita, Adriano A. Bordalo, António O.S.S. Rangel

Talanta > 2012 > 98 > Complete > 203-210

In this work, a solid phase extraction sequential injection methodology for the determination of alkaline phosphatase activity in dynamic water systems was developed. The determination of the enzymatic activity was based on the spectrophotometric detection of a coloured product, p-nitrophenol, at 405nm. The p-nitrophenol is the product of the catalytic decomposition of p-nitrophenyl phosphate, a non-coloured...

article

Development of a Turbidimetric Sequential Injection System to Monitor the Codfish Desalting Process

Inês C. Santos, Raquel B. R. Mesquita, Andrea C. Galvis-Sánchez, Ivonne Delgadillo, more

Food Analytical Methods > 2012 > 5 > 2 > 287-295

Salt-cured codfish represents an ancient process of preservation but requires the rehydration of the codfish with the correspondent salt removal. This work describes the development of a sequential injection system for the on-line turbidimetric determination of chloride during a simulated desalting process. The samples are directly aspirated to the manifold with no need for previous off-line treatments;...

article

Development of flow injection potentiometric methods for the off-line and on-line determination of fluoride to monitor the biodegradation of a monofluorophenol in two bioreactors

Raquel B.R. Mesquita, Inês C. Santos, Marta F.F. Pedrosa, Anouk F. Duque, more

Talanta > 2011 > 84 > 5 > 1291-1297

Water treatment has become a source of concern as new pollutants and higher volumes of waste water must be treated. Emerging biological approaches, namely the use of bioreactors, for cleaning processes have been introduced. The use of bioreactors requires the development of efficient monitoring tools, preferably with real-time measurements. In this work, a couple of flow injection systems were developed...

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