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Article ; Online: Enhancing Essential Oil Extraction from Lavandin Grosso Flowers via Plasma Treatment.

Molina, Ricardo / López-Santos, Carmen / Balestrasse, Karina / Gómez-Ramírez, Ana / Sauló, Jordi

International journal of molecular sciences

2024 Volume 25, Issue 4

Abstract: This study explores the impact of plasma treatment on Lavandin Grosso flowers and its influence on the extraction of essential oils (EOs) via hydrodistillation. Short plasma treatment times enhance the yield of EO extraction from 3.19% in untreated ... ...

Abstract	This study explores the impact of plasma treatment on Lavandin Grosso flowers and its influence on the extraction of essential oils (EOs) via hydrodistillation. Short plasma treatment times enhance the yield of EO extraction from 3.19% in untreated samples to 3.44%, corresponding to 1 min of plasma treatment, while longer treatment times (10 min) show diminishing returns to 3.07% of yield extraction. Chemical characterization (GC/MS and ATR-FTIR) indicates that plasma treatments do not significantly alter the chemical composition of the extracted EOs, preserving their aromatic qualities. Investigations into plasma-surface interactions reveal changes at the nanometer level, with XPS confirming alterations in the surface chemistry of Lavandin Grosso flowers by reducing surface carbon and increasing oxygen content, ultimately resulting in an increased presence of hydrophilic groups. The presence of hydrophilic groups enhances the interaction between the surface membrane of the glandular trichomes on Lavandin Grosso flowers and water vapor, consequently increasing the extraction of EOs. Furthermore, microscopic SEM examinations demonstrate that plasma treatments do not affect the morphology of glandular trichomes, emphasizing that surface modifications primarily occur at the nanoscale. This study underscores the potential of plasma technology as a tool to enhance EO yields from botanical sources while maintaining their chemical integrity.
MeSH term(s)	Oils, Volatile/chemistry ; Gas Chromatography-Mass Spectrometry ; Flowers/chemistry ; Steam ; Technology
Chemical Substances	Oils, Volatile ; Steam
Language	English
Publishing date	2024-02-17
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2019364-6
ISSN	1422-0067 ; 1422-0067 ; 1661-6596
ISSN (online)	1422-0067
ISSN	1422-0067 ; 1661-6596
DOI	10.3390/ijms25042383
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Needle guidance with Doppler-tracked polarization-sensitive optical coherence tomography.

Harper, Danielle J / Kim, Yongjoo / Gómez-Ramírez, Alejandra / Vakoc, Benjamin J

ArXiv

2023

Abstract: We demonstrate that a simple, unscanned polarization-sensitive optical coherence tomography needle probe can be used to perform layer identification in biological tissues. Broadband light from a laser centered at 1310 nm was sent through a fiber that was ...

Abstract	We demonstrate that a simple, unscanned polarization-sensitive optical coherence tomography needle probe can be used to perform layer identification in biological tissues. Broadband light from a laser centered at 1310 nm was sent through a fiber that was embedded into a needle, and analysis of the polarization state of the returning light after interference coupled with Doppler-based tracking allowed the calculation of phase retardation and optic axis orientation at each needle location. Proof-of-concept phase retardation mapping was shown in Atlantic salmon tissue, while axis orientation mapping was demonstrated in white shrimp tissue. The needle probe was then tested on the ex vivo porcine spine, where mock epidural procedures were performed. Our imaging results demonstrate that unscanned, Doppler-tracked polarization-sensitive optical coherence tomography imaging successfully identified the skin, subcutaneous tissue, and ligament layers, before successfully reaching the target of the epidural space. The addition of polarization-sensitive imaging into the bore of a needle probe therefore allows layer identification at deeper locations in the tissue.
Language	English
Publishing date	2023-05-22
Publishing country	United States
Document type	Preprint
ISSN	2331-8422
ISSN (online)	2331-8422
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Article ; Online: Needle guidance with Doppler-tracked polarization-sensitive optical coherence tomography.

Harper, Danielle J / Kim, Yongjoo / Gómez-Ramírez, Alejandra / Vakoc, Benjamin J

Journal of biomedical optics

2023 Volume 28, Issue 10, Page(s) 102910

Abstract: Significance: Optical coherence tomography (OCT) can be integrated into needle probes to provide real-time navigational guidance. However, unscanned implementations, which are the simplest to build, often struggle to discriminate the relevant tissues.!## ...

Abstract	Significance: Optical coherence tomography (OCT) can be integrated into needle probes to provide real-time navigational guidance. However, unscanned implementations, which are the simplest to build, often struggle to discriminate the relevant tissues. Aim: We explore the use of polarization-sensitive (PS) methods as a means to enhance signal interpretability within unscanned coherence tomography probes. Approach: Broadband light from a laser centered at 1310 nm was sent through a fiber that was embedded into a needle. The polarization signal from OCT fringes was combined with Doppler-based tracking to create visualizations of the birefringence properties of the tissue. Experiments were performed in (i) well-understood structured tissues (salmon and shrimp) and (ii) Results: In the porcine spine, unscanned and Doppler-tracked PS OCT imaging data successfully identified the skin, subcutaneous tissue, ligament, and epidural spaces during needle insertion. Conclusions: PS imaging within a needle probe improves signal interpretability relative to structural OCT methods and may advance the clinical utility of unscanned OCT needle probes in a variety of applications.
MeSH term(s)	Animals ; Swine ; Tomography, Optical Coherence/methods ; Skin/diagnostic imaging ; Light ; Refraction, Ocular ; Birefringence
Language	English
Publishing date	2023-10-04
Publishing country	United States
Document type	Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
ZDB-ID	1309154-2
ISSN	1560-2281 ; 1083-3668
ISSN (online)	1560-2281
ISSN	1083-3668
DOI	10.1117/1.JBO.28.10.102910
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Article ; Online: Open-access database for digital lensless holographic microscopy and its application on the improvement of deep-learning-based autofocusing models.

Buitrago-Duque, Carlos / Tobón-Maya, Heberley / Gómez-Ramírez, Alejandra / Zapata-Valencia, Samuel I / Lopera, Maria J / Trujillo, Carlos / Garcia-Sucerquia, Jorge

Applied optics

2024 Volume 63, Issue 7, Page(s) B49–B58

Abstract: Among modern optical microscopy techniques, digital lensless holographic microscopy (DLHM) is one of the simplest label-free coherent imaging approaches. However, the hardware simplicity provided by the lensless configuration is often offset by the ... ...

Abstract	Among modern optical microscopy techniques, digital lensless holographic microscopy (DLHM) is one of the simplest label-free coherent imaging approaches. However, the hardware simplicity provided by the lensless configuration is often offset by the demanding computational postprocessing required to match the retrieved sample information to the user's expectations. A promising avenue to simplify this stage is the integration of artificial intelligence and machine learning (ML) solutions into the DLHM workflow. The biggest challenge to do so is the preparation of an extensive and high-quality experimental dataset of curated DLHM recordings to train ML models. In this work, a diverse, open-access dataset of DLHM recordings is presented as support for future research, contributing to the data needs of the applied research community. The database comprises 11,760 experimental DLHM holograms of bio and non-bio samples with diversity on the main recording parameters of the DLHM architecture. The database is divided into two datasets of 10 independent imaged samples. The first group, named multi-wavelength dataset, includes 8160 holograms and was recorded using laser diodes emitting at 654 nm, 510 nm, and 405 nm; the second group, named single-wavelength dataset, is composed of 3600 recordings and was acquired using a 633 nm He-Ne laser. All the experimental parameters related to the dataset acquisition, preparation, and calibration are described in this paper. The advantages of this large dataset are validated by re-training an existing autofocusing model for DLHM and as the training set for a simpler architecture that achieves comparable performance, proving its feasibility for improving existing ML-based models and the development of new ones.
Language	English
Publishing date	2024-03-04
Publishing country	United States
Document type	Journal Article
ISSN	1539-4522
ISSN (online)	1539-4522
DOI	10.1364/AO.507412
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Article: Incorporation of a Metal Catalyst for the Ammonia Synthesis in a Ferroelectric Packed-Bed Plasma Reactor: Does It Really Matter?

Navascués, Paula / Garrido-García, Juan / Cotrino, José / González-Elipe, Agustín R / Gómez-Ramírez, Ana

ACS sustainable chemistry & engineering

2023 Volume 11, Issue 9, Page(s) 3621–3632

Abstract: Plasma-catalysis has been proposed as a potential alternative for the synthesis of ammonia. Studies in this area focus on the reaction mechanisms and the apparent synergy existing between processes occurring in the plasma phase and on the surface of the ... ...

Abstract	Plasma-catalysis has been proposed as a potential alternative for the synthesis of ammonia. Studies in this area focus on the reaction mechanisms and the apparent synergy existing between processes occurring in the plasma phase and on the surface of the catalytic material. In the present study, we approach this problem using a parallel-plate packed-bed reactor with the gap between the electrodes filled with pellets of lead zirconate titanate (PZT), with this ferroelectric material modified with a coating layer of alumina (i.e., Al
Language	English
Publishing date	2023-02-20
Publishing country	United States
Document type	Journal Article
ISSN	2168-0485
ISSN	2168-0485
DOI	10.1021/acssuschemeng.2c05877
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Article ; Online: Adapting a Blu-ray optical pickup unit as a point source for digital lensless holographic microscopy.

Tobón-Maya, Heberley / Gómez-Ramírez, Alejandra / Buitrago-Duque, Carlos / Garcia-Sucerquia, Jorge

Applied optics

2023 Volume 62, Issue 10, Page(s) D39–D47

Abstract: The adaptation of an off-the-shelf Blu-ray optical pickup unit (OPU) into a highly versatile point source for digital lensless holographic microscopy (DLHM) is presented. DLHM performance is mostly determined by the optical properties of the point source ...

Abstract	The adaptation of an off-the-shelf Blu-ray optical pickup unit (OPU) into a highly versatile point source for digital lensless holographic microscopy (DLHM) is presented. DLHM performance is mostly determined by the optical properties of the point source of spherical waves used for free-space magnification of the sample's diffraction pattern; in particular, its wavelength and numerical aperture define the achievable resolution, and its distance to the recording medium sets the magnification. Through a set of straightforward modifications, a commercial Blu-ray OPU can be transformed into a DLHM point source with three selectable wavelengths, a numerical aperture of up to 0.85, and integrated micro-displacements in both axial and transversal directions. The functionality of the OPU-based point source is then experimentally validated in the observation of micrometer-sized calibrated samples and biological specimens of common interest, showing the feasibility of obtaining sub-micrometer resolution and offering a versatile option for the development of new cost-effective and portable microscopy devices.
Language	English
Publishing date	2023-05-01
Publishing country	United States
Document type	Journal Article
ISSN	1539-4522
ISSN (online)	1539-4522
DOI	10.1364/AO.474916
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Article ; Online: Germination and First Stages of Growth in Drought, Salinity, and Cold Stress Conditions of Plasma-Treated Barley Seeds.

Perea-Brenes, Alvaro / Garcia, Jose Luis / Cantos, Manuel / Cotrino, Jose / Gonzalez-Elipe, Agustín R / Gomez-Ramirez, Ana / Lopez-Santos, Carmen

ACS agricultural science & technology

2023 Volume 3, Issue 9, Page(s) 760–770

Abstract: Numerous works have demonstrated that cold plasma treatments constitute an effective procedure to accelerate seed germination under nonstress conditions. Evidence also exists about a positive effect of plasmas for germination under environmental stress ... ...

Abstract	Numerous works have demonstrated that cold plasma treatments constitute an effective procedure to accelerate seed germination under nonstress conditions. Evidence also exists about a positive effect of plasmas for germination under environmental stress conditions. For barley seeds, this work studies the influence of cold plasma treatments on the germination rate and initial stages of plant growth in common stress environments, such as drought, salinity, and low-temperature conditions. As a general result, it has been found that the germination rate was higher for plasma-treated than for untreated seeds. Plasma also induced favorable changes in plant and radicle dimensions, which depended on the environment. The obtained results demonstrate that plasma affects the biochemical metabolic chains of seeds and plants, resulting in changes in the concentration of biochemical growing factors, a faster germination, and an initially more robust plant growth, even under stress conditions. These changes in phenotype are accompanied by differences in the concentration of biomarkers such as photosynthetic pigments (chlorophylls
Language	English
Publishing date	2023-09-06
Publishing country	United States
Document type	Journal Article
ISSN	2692-1952
ISSN (online)	2692-1952
DOI	10.1021/acsagscitech.3c00121
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Article ; Online: Surface chemistry and germination improvement of Quinoa seeds subjected to plasma activation.

Gómez-Ramírez, A / López-Santos, C / Cantos, M / García, J L / Molina, R / Cotrino, J / Espinós, J P / González-Elipe, A R

Scientific reports

2017 Volume 7, Issue 1, Page(s) 5924

Abstract: Plasma treatment is recognized as a suitable technology to improve germination efficiency of numerous seeds. In this work Quinoa seeds have been subjected to air plasma treatments both at atmospheric and low pressure and improvements found in germination ...

Abstract	Plasma treatment is recognized as a suitable technology to improve germination efficiency of numerous seeds. In this work Quinoa seeds have been subjected to air plasma treatments both at atmospheric and low pressure and improvements found in germination rate and percentage of success. Seed water uptake by exposure to water vapor, although slightly greater for plasma treated seeds, did not justify the observed germination improvement. To identify other possible factors contributing to germination, the chemical changes experienced by outer parts of the seed upon plasma exposure have been investigated by X-ray photoemission spectroscopy (XPS) and scanning electron microscopy (SEM-EDX). XPS revealed that the outer layers of the Quinoa plasma treated seeds were highly oxidized and appeared enriched in potassium ions and adsorbed nitrate species. Simultaneously, SEM-EDX showed that the enrichment in potassium and other mineral elements extended to the seed pericarp and closer zones. The disappearance from the surface of both potassium ions and nitrate species upon exposure of the plasma treated seeds to water vapor is proposed as a factor favoring germination. The use of XPS to study chemical changes at seed surfaces induced by plasma treatments is deemed very important to unravel the mechanisms contributing to germination improvement.
MeSH term(s)	Chenopodium quinoa/chemistry ; Germination/drug effects ; Photoelectron Spectroscopy ; Plasma Gases/pharmacology ; Seeds/chemistry ; Seeds/ultrastructure ; Surface Properties ; Water/chemistry
Chemical Substances	Plasma Gases ; Water (059QF0KO0R)
Language	English
Publishing date	2017-07-19
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-017-06164-5
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Article ; Online: Influence of irrigation conditions in the germination of plasma treated Nasturtium seeds.

Molina, Ricardo / López-Santos, Carmen / Gómez-Ramírez, Ana / Vílchez, Alberto / Espinós, Juan Pedro / González-Elipe, Agustín R

Scientific reports

2018 Volume 8, Issue 1, Page(s) 16442

Abstract: Plasma treatments had emerged as a useful technique to improve seed germination. In this work we investigate the influence of different irrigation conditions and plasma treatments on the germination of nasturtium seeds. During plasma treatment, seeds ... ...

Abstract	Plasma treatments had emerged as a useful technique to improve seed germination. In this work we investigate the influence of different irrigation conditions and plasma treatments on the germination of nasturtium seeds. During plasma treatment, seeds experience a progressive weight loss as a function of treatment time that has been associated to water release, a process that is more pronounced after longer plasma treatment times. Seeds treated for short times (<30 s) are able to germinate more efficiently than untreated specimen under hydric stress (drought conditions), while plasma treatments for longer times (up to 300 s) impaired germination independently on irrigation conditions. Characterization analysis of plasma treated seeds by FTIR-ATR, SEM/EDX and XPS showed that plasma treatment affected the chemical state of pericarp while, simultaneously, induced a considerable increase in the seeds water uptake capacity. The decrease in germination efficiency found after plasma treatment for long times, or for short times under optimum irrigation conditions, has been attributed to that the excess of water accumulated in the pericarp hampers the diffusion up to the embryo of other agents like oxygen which are deemed essential for germination.
MeSH term(s)	Agricultural Irrigation ; Germination ; Nasturtium/drug effects ; Nasturtium/growth & development ; Plasma Gases/pharmacology ; Seeds/drug effects ; Seeds/growth & development ; Temperature ; Water
Chemical Substances	Plasma Gases ; Water (059QF0KO0R)
Language	English
Publishing date	2018-11-06
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-018-34801-0
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Article ; Online: Development of lipopolyplexes for gene delivery: A comparison of the effects of differing modes of targeting peptide display on the structure and transfection activities of lipopolyplexes.

Bofinger, Robin / Zaw-Thin, May / Mitchell, Nicholas J / Patrick, P Stephen / Stowe, Cassandra / Gomez-Ramirez, Ana / Hailes, Helen C / Kalber, Tammy L / Tabor, Alethea B

Journal of peptide science : an official publication of the European Peptide Society

2018 Volume 24, Issue 12, Page(s) e3131

Abstract: The design, synthesis and formulation of non-viral gene delivery vectors is an area of renewed research interest. Amongst the most efficient non-viral gene delivery systems are lipopolyplexes, in which cationic peptides are co-formulated with plasmid DNA ...

Abstract	The design, synthesis and formulation of non-viral gene delivery vectors is an area of renewed research interest. Amongst the most efficient non-viral gene delivery systems are lipopolyplexes, in which cationic peptides are co-formulated with plasmid DNA and lipids. One advantage of lipopolyplex vectors is that they have the potential to be targeted to specific cell types by attaching peptide targeting ligands on the surface, thus increasing both the transfection efficiency and selectivity for disease targets such as cancer cells. In this paper, we have investigated two different modes of displaying cell-specific peptide targeting ligands at the surface of lipopolyplexes. Lipopolyplexes formulated with bimodal peptides, with both receptor binding and DNA condensing sequences, were compared with lipopolyplexes with the peptide targeting ligand directly conjugated to one of the lipids. Three EGFR targeting peptide sequences were studied, together with a range of lipid formulations and maleimide lipid structures. The biophysical properties of the lipopolyplexes and their transfection efficiencies in a basal-like breast cancer cell line were investigated using plasmid DNA bearing genes for the expression of firefly luciferase and green fluorescent protein. Fluorescence quenching experiments were also used to probe the macromolecular organisation of the peptide and pDNA components of the lipopolyplexes. We demonstrated that both approaches to lipopolyplex targeting give reasonable transfection efficiencies, and the transfection efficiency of each lipopolyplex formulation is highly dependent on the sequence of the targeting peptide. To achieve maximum therapeutic efficiency, different peptide targeting sequences and lipopolyplex architectures should be investigated for each target cell type.
MeSH term(s)	Antimicrobial Cationic Peptides/chemical synthesis ; Antimicrobial Cationic Peptides/chemistry ; Breast Neoplasms/metabolism ; Breast Neoplasms/therapy ; DNA/chemistry ; DNA/genetics ; ErbB Receptors/antagonists & inhibitors ; ErbB Receptors/metabolism ; Female ; Gene Transfer Techniques ; Genetic Vectors/chemistry ; Genetic Vectors/genetics ; Humans ; Ligands ; Lipids/chemistry ; Plasmids/chemistry ; Protein Conformation ; Surface Properties ; Transfection
Chemical Substances	Antimicrobial Cationic Peptides ; Ligands ; Lipids ; DNA (9007-49-2) ; EGFR protein, human (EC 2.7.10.1) ; ErbB Receptors (EC 2.7.10.1)
Language	English
Publishing date	2018-10-16
Publishing country	England
Document type	Comparative Study ; Journal Article
ZDB-ID	1234416-3
ISSN	1099-1387 ; 1075-2617
ISSN (online)	1099-1387
ISSN	1075-2617
DOI	10.1002/psc.3131
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