Search results for: Paul Geladi

Items from 1 to 20 out of 52 results

article

Near infrared and hyperspectral studies of archaeological stratigraphy and statistical considerations

Johan Linderholm, Paul Geladi, Nathalie Gorretta, Ryad Bendoula, more

The paper proposes a methodology based on near‐infrared (NIR) spectrometry for studying stratigraphy and depth profiles in archaeological excavations. The NIR spectra can be used to describe and complement the wet chemical analysis. Soil samples were collected from a 0.8 m deep stratigraphy of a Neolithic site that were analyzed by three different NIR instrumentations. Phosphate‐ and magnetic susceptibility...

article

Supercritical extraction of waxes and lipids from biomass: A valuable first step towards an integrated biorefinery

Thomas M. Attard, Natalia Bukhanko, Daniel Eriksson, Mehrdad Arshadi, more

Journal of Cleaner Production > 2018 > 177 > C > 684-698

The decline in petrochemical wax supply coupled with the ever-growing demand for bio-products means that the development of a sustainable process to renewably sourced waxes is paramount. This review focuses on recent advances in supercritical extraction as a clean efficient process for extracting waxes from waste biomass as a part of a holistic biorefinery. The use of supercritical carbon dioxide...

article

Determination of methotrexate in spiked human blood serum using multi-frequency electrochemical immittance spectroscopy and multivariate data analysis

Sereilakhena Phal, Britta Lindholm-Sethson, Paul Geladi, Andrey Shchukarev, more

Analytica Chimica Acta > 2017 > 987 > C > 15-24

This article describes an attempt to develop a sensor based on multi-frequency immittance spectroscopy for the determination of methotrexate (MTX) in blood serum using gold electrodes modified with antibodies. The attachment of antibodies was monitored with electrochemical immittance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The EIS measurements of MTX resulted in a data matrix...

article

Detection of low levels of Escherichia coli by electrochemical impedance spectroscopy and singular value decomposition

Karolina Krupinska, Paul Geladi, Inger Vikholm-Lundin, Britta Lindholm-Sethson

Chemometrics and Intelligent Laboratory Systems > 2017 > 163 > C > 49-54

The first steps are reported in the development of a new ultrasensitive electrochemical biosensor for detection of Escherichia coli (E. coli) in water. Two gold electrodes in a sandwich flow-cell were modified with E. coli polyclonal antibody and exposed to three different concentrations of E. coli. Electrochemical Impedance Spectroscopy was used in combination with Singular Value Decompostion of...

article

Low-temperature drying of industrial biosludge with simulated secondary heat

Mikko Mäkelä, Jenny Edler, Paul Geladi

Applied Thermal Engineering > 2017 > 116 > C > 792-798

Drying is an energy-intensive unit operation and future sludge dryers should be able to take advantage of the secondary energy of industrial environments. This work reports the use of a pilot cyclone for drying biosludge at low temperatures and simulating the use of secondary waste heat. The pilot-scale experiments were performed according to an experimental design and the results interpreted using...

article

NIR hyperspectral imaging and multivariate image analysis to characterize spent mushroom substrate: a preliminary study

Maogui Wei, Paul Geladi, Shaojun Xiong

Analytical and Bioanalytical Chemistry > 2017 > 409 > 9 > 2449-2460

Commercial mushroom growth on substrate material produces a heterogeneous waste that can be used for bioenergy purposes. Hyperspectral imaging in the near-infrared (NHI) was used to experimentally study a number of spent mushroom substrate (SMS) packed samples under different conditions (wet vs. dry, open vs. plastic covering, and round or cuboid) and to explore the possibilities of direct characterization...

article

A new approach for variable influence on projection (VIP) in O2PLS models

Beatriz Galindo-Prieto, Johan Trygg, Paul Geladi

Chemometrics and Intelligent Laboratory Systems > 2017 > 160 > C > 110-124

A novel variable influence on projection approach for O2PLS® models, named VIP_O2PLS, is presented in this paper. VIP_O2PLS is a model-based method for judging the importance of variables. Its cornerstone is the 2-way formalism of the O2PLS models; i.e. the use of both predictive and orthogonal normalized loadings of the two modelled data matrices, and also a new weighting system based on the sum of...

article

Cyclone processing of green liquor dregs (GLD) with results measured and interpreted by ICP-OES and NIR spectroscopy

Mikko Mäkelä, Paul Geladi, Alejandro Grimm, Olli Dahl, more

Chemical Engineering Journal > 2016 > 304 > C > 448-453

An experimental design in cyclone drying parameters for green liquor sludge led to an efficient drying of the material and an interpretation of optimal cyclone parameters. The obtained dried materials were analyzed by ICP-OES and NIR spectroscopy. The inorganic analysis showed that a partial separation of toxic chemicals is possible and the NIR results could be used as an extra way of interpreting...

article

Detection of methotrexate in a flow system using electrochemical impedance spectroscopy and multivariate data analysis

Solomon Tesfalidet, Paul Geladi, Kenichi Shimizu, Britta Lindholm-Sethson

Analytica Chimica Acta > 2016 > 914 > C > 1-6

Methotrexate (MTX), a common pharmaceutical drug in cancer therapy and treatment of rheumatic diseases, is known to cause severe adverse side effects at high dose. As the side effect may be life threatening, there is an urgent need for a continuous, bed-side monitoring of the nominal MTX serum level in a patient while the chemical is being administered. This article describes a detection of MTX using...

article

Response surface optimization of a novel pilot dryer for processing mixed forest industry biosludge

Mikko Mäkelä, Paul Geladi

International Journal of Energy Research > 39 > 12 > 1636 - 1648

As a promising sludge handling alternative capable of utilizing the secondary energies in industrial environments, we investigated the use of a novel pilot‐scale cyclone dryer for processing industrial mixed sludge from the forest industry. Attainable sludge dry solids contents (%) and respective specific energy consumption of drying (kWh kg⁻¹ H₂O) were successfully modelled by response surface methodology...

article

Application of Rapid Visco Analyser (RVA) viscograms and chemometrics for maize hardness characterisation

Anina Guelpa, Marta Bevilacqua, Federico Marini, Kim O’Kennedy, more

Food Chemistry > 2015 > 173 > Complete > 1220-1227

It has been established in this study that the Rapid Visco Analyser (RVA) can describe maize hardness, irrespective of the RVA profile, when used in association with appropriate multivariate data analysis techniques. Therefore, the RVA can complement or replace current and/or conventional methods as a hardness descriptor. Hardness modelling based on RVA viscograms was carried out using seven conventional...

article

Multivariate modelling on biomass properties of cassava stems based on an experimental design

Maogui Wei, Paul Geladi, Torbjörn A. Lestander, Guanghui Xie, more

Analytical and Bioanalytical Chemistry > 2015 > 407 > 18 > 5443-5452

Based on a factorial experimental design (three locations × three cultivars × five harvest times × four replicates) conducted with the objective of investigating variations in fuel characteristics of cassava stem, a multivariate data matrix was formed which was composed of 180 samples and 10 biomass properties for each sample. The properties included as responses were two different calorific values...

article

Pretreatment of recycled paper sludge with a novel high-velocity pilot cyclone: Effect of process parameters on convective drying efficiency

Mikko Mäkelä, Paul Geladi, Sylvia H. Larsson, Michael Finell

Applied Energy > 2014 > 131 > C > 490-498

To address the growing need for economically viable sludge processing technologies and associated resource recovery, a novel convective high-velocity pilot cyclone was set-up at the Swedish University of Agricultural Sciences in Umeå, Sweden. In essence this process entails feeding (⩽900kgh⁻¹) a material to a heated high-velocity air flow (approx. 13×10³m³h⁻¹) allowing moisture removal at low temperatures...

article

Multivariate data analysis to characterize gas chromatography columns for dioxin analysis

Lan Do, Paul Geladi, Peter Haglund

Journal of Chromatography A > 2014 > 1347 > Complete > 137-145

Principal component analysis (PCA) was applied for evaluating the selectivity of 22 GC columns for which complete retention data were available for the 136 tetra- to octa-chlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs). Because the hepta- and octa-homologues are easy to separate the PCA was focused on the 128 tetra- to hexa-CDD/Fs. The analysis showed that 21 of the 22 GC columns could...

article

Data analysis of hyperspectral NIR image mosaics for the quantification of linseed oil impregnation in Scots pine wood

Paul Geladi, Daniel Eriksson, Thomas Ulvcrona

Wood Science and Technology > 2014 > 48 > 3 > 467-481

Eight pieces of sapwood and heartwood from Scots pine, before and after linseed oil impregnation, were used to make 16 near-infrared hyperspectral images (90–200 pixels wide × 466–985 pixels long × 239 wavelengths: 982–2,480 nm). The wood pieces were selected according to a 2 × 2 experimental design using radial–tangential cut and heartwood–sapwood as factors with two replicates. A first mosaic of...

article

Comparison of fatty and resin acid composition in boreal lodgepole pine and Scots pine for biorefinery applications

Mehrdad Arshadi, Ingegerd Backlund, Paul Geladi, Urban Bergsten

Industrial Crops & Products > 2013 > 49 > Complete > 535-541

To investigate the potential for Scots- and lodgepole pine for biorefinery applications such as e.g., biodiesel and glue production, wood samples from five different sites in northern Sweden were compared. 21 fatty and 10 resin acids were detected by extraction and GC–MS analysis. Total fatty- and resin acid contents of Scots pine varied between 2.4 and 41.4mg/g. Corresponding concentrations for lodgepole...

article

Large Uptake of Titania and Iron Oxide Nanoparticles in the Nucleus of Lung Epithelial Cells as Measured by Raman Imaging and Multivariate Classification

Linnea Ahlinder, Barbro Ekstrand-Hammarström, Paul Geladi, Lars Österlund

Biophysical Journal > 2013 > 105 > 2 > 310-319

It is a challenging task to characterize the biodistribution of nanoparticles in cells and tissue on a subcellular level. Conventional methods to study the interaction of nanoparticles with living cells rely on labeling techniques that either selectively stain the particles or selectively tag them with tracer molecules. In this work, Raman imaging, a label-free technique that requires no extensive...

article

Non‐invasive identification of melanoma with near‐infrared and skin impedance spectroscopy

Ida Bodén, Josefina Nyström, Bertil Lundskog, Virginia Zazo, more

Skin Research and Technology > 19 > 1 > e473 - e478

Background/purposeAn early diagnosis of cutaneous malignant melanoma is of high importance for good prognosis. An objective, non‐invasive instrument could improve the diagnostic accuracy of melanoma and decrease unnecessary biopsies. The aim of this study was to investigate the use of Near‐infrared and skin impedance spectroscopy in combination as a tool to distinguish between malignant and benign...

article

NIR and skin impedance spectroscopic measurements for studying the effect of coffee and alcohol on skin, and dysplastic naevi

Ida Bodén, Josefina Nyström, Paul Geladi, Peter Naredi, more

Skin Research and Technology > 18 > 4 > 486 - 494

Background/purposeNear infrared and impedance spectroscopy can be used for clinical skin measurements and need to be evaluated for possible confounding factors; (i) are skin conditions of the patient and the subsequent skin measurements influenced by alcohol and/or coffee consumption and (ii) are measurements of dysplastic naevi (DN) reproducible over time and significantly different compared to reference...

article

Biomass properties in association with plant species and assortments. II: A synthesis based on literature data for ash elements

Guangcan Tao, Paul Geladi, Torbjörn A. Lestander, Shaojun Xiong

Renewable and Sustainable Energy Reviews > 2012 > 16 > 5 > 3507-3522

A study was carried out based on ash composition data (relative proportion of SiO ₂ , K ₂ O, CaO, MgO, Na ₂ O, P ₂ O ₅ , Al ₂ O ₃ , Fe ₂ O ₃ and SO ₂ in ash) in a large number of biomass species and assortments. The data were collected from 109 peer-reviewed publications and consisted of 367 objects for ash composition...

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INFONA - science communication portal

Search results for: Paul Geladi

Near infrared and hyperspectral studies of archaeological stratigraphy and statistical considerations

Supercritical extraction of waxes and lipids from biomass: A valuable first step towards an integrated biorefinery

Determination of methotrexate in spiked human blood serum using multi-frequency electrochemical immittance spectroscopy and multivariate data analysis

Detection of low levels of Escherichia coli by electrochemical impedance spectroscopy and singular value decomposition

Low-temperature drying of industrial biosludge with simulated secondary heat

NIR hyperspectral imaging and multivariate image analysis to characterize spent mushroom substrate: a preliminary study

A new approach for variable influence on projection (VIP) in O2PLS models

Cyclone processing of green liquor dregs (GLD) with results measured and interpreted by ICP-OES and NIR spectroscopy

Detection of methotrexate in a flow system using electrochemical impedance spectroscopy and multivariate data analysis

Response surface optimization of a novel pilot dryer for processing mixed forest industry biosludge

Application of Rapid Visco Analyser (RVA) viscograms and chemometrics for maize hardness characterisation

Multivariate modelling on biomass properties of cassava stems based on an experimental design

Pretreatment of recycled paper sludge with a novel high-velocity pilot cyclone: Effect of process parameters on convective drying efficiency

Multivariate data analysis to characterize gas chromatography columns for dioxin analysis

Data analysis of hyperspectral NIR image mosaics for the quantification of linseed oil impregnation in Scots pine wood

Comparison of fatty and resin acid composition in boreal lodgepole pine and Scots pine for biorefinery applications

Large Uptake of Titania and Iron Oxide Nanoparticles in the Nucleus of Lung Epithelial Cells as Measured by Raman Imaging and Multivariate Classification

Non‐invasive identification of melanoma with near‐infrared and skin impedance spectroscopy

NIR and skin impedance spectroscopic measurements for studying the effect of coffee and alcohol on skin, and dysplastic naevi

Biomass properties in association with plant species and assortments. II: A synthesis based on literature data for ash elements

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