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Papers by MARINA CARDENAS GONZALEZ
Brazilian Journal of Forensic Sciences, Medical Law and Bioethics, 2020
Marijuana is the most popular form of Cannabis sativa L. (Cannabaceae), popularly known, in Brazi... more Marijuana is the most popular form of Cannabis sativa L. (Cannabaceae), popularly known, in Brazil, as the illicit drug. It is composed of the plant’s aerial parts, such as the leaves and the inflorescences, which are dried, pressed and prepared as a mixture for smoking. Cannabis is the most consumed and illegally trafficked drug in the world, with an increasing number of users every year. The plant can be grown indoor and outdoor, and these differences may influence the drug’s potency. In addition, marijuana can be mixed with diluents and/or adulterants such as aromatic plants, soil, commercial tobacco and feces that may contribute to cases of addiction and lead to serious health risks to its consumers. Studies involving the chemical profile of drug samples are important to provide evidence for trafficking, supporting the materiality of the crimes. The aim of this study is to analyze cannabis and marijuana seized samples by FTIR-ATR (range 1800-880 cm), combined with unsupervised c...
Brazilian Journal of Analytical Chemistry, 2021
The temporal estimation of the fingermarks deposition at crime scenes is a recurring issue in for... more The temporal estimation of the fingermarks deposition at crime scenes is a recurring issue in forensic identification. To study this challenging topic, a preliminary study was proposed to develop a method of fingermark analysis by Fourier Transform Infrared Microscopy (µ-FTIR), using chemometric tools for time separation in a six-day aging study. The samples were collected and analyzed at hour zero, 3 days (72 hours), 4 days (96 hours), 5 days (120 hours) and 6 days (144 hours). The samples were separated into a calibration set and a test set, using Kennard Stone. Following, a comparison between variable selection tools was made of the Ant of Colony (AOC) and the Genetic Algorithm (GA) were used with subsequent application of the Linear Discriminant Analysis (LDA). The results showed that in the analyzed samples there was a predominance of sebaceous material because of the presence of saturated esters signals, with two regions of interest in the infrared spectra, the first being 180...
Brazilian Journal of Analytical Chemistry, 2021
Questioned documents comprehend analysis of identity theft, forged signatures or texts, documents... more Questioned documents comprehend analysis of identity theft, forged signatures or texts, documents alterations and falsification of security documents or banknotes. Questions involving inks or paper require chemical analysis, and multivariate analysis or chemometrics has been an emerging tool for data evaluation and interpretation after instrumental data collection in this area. The goal of this study is to identify previous articles that applied multivariate analysis within questioned documents for forensic purposes. The search for articles was performed in four databases (Google Scholar, Science Direct, Pubmed and Scopus). Sixty studies, published in the last ten years, were selected. Thirty-four articles described pen inks analysis; fourteen articles comprehended printed documents studies; eight articles evaluated paper analysis, and four articles included banknotes analysis. Spectroscopy, mass spectrometry, chromatography, thermo gravimetric analysis and multivariate image analys...
Revista Brasileira de Ciências Policiais, 2020
Cannabis sativa L is one of the most used drugs in the world. Information about the plant’s age a... more Cannabis sativa L is one of the most used drugs in the world. Information about the plant’s age and storage can help forensic scientists to identify and to track samples. The ratio between the cannabinoids tetrahydrocannabinol (THC) and cannabinol (CBN) has been related to the degradation of cannabis with time. Thus, this study aimed to test Multivariate Image Analysis (MIA) to evaluate cannabis extracts concerning its colors. Initially, 52 samples of Cannabis sativa L. extracts were analyzed by Gas Chromatography coupled to Flame Ionization Detector (GC/FID) to quantify THC and CBN. Afterwards, the extract samples were photographed and analyzed by two different multivariate analysis tools: ChemoStat®, a free chemometrics software, and PhotoMetrix PRO®, an app for mobile devices. Using exploratory analysis of principal component analysis (PCA) and hierarchical cluster analysis (HCA). It was observed that the more intense the color for an extract, the higher concentration of THC and ...
Journal of Forensic Sciences, 2020
This systematic review deals with the last 10 years of research in analytical methodologies for t... more This systematic review deals with the last 10 years of research in analytical methodologies for the analysis of fingerprints, regarding their chemical and biological constituents. A total of 123 manuscripts, which fit the search criteria defined using the descriptor "latent fingermarks analysis," were selected. Its main instrumental areas (mass spectrometry, spectroscopy, and innovative methods) were analyzed and summarized in a specific table, highlighting its main analytical parameters. The results show that most studies in this field use mass spectrometry to identify the constituents of fingerprints, both to determine the chemical profile and for aging. There is also a marked use of mass spectrometry coupled with chromatographic methods, and it provides accurate results for a fatty acid profile. Additional significant results are achieved by spectroscopic methods, mainly Raman and infrared. It is noteworthy that spectroscopic methods using microscopy assist in the accuracy of the analyzed region of the fingerprint, contributing to more robust results. There was also a significant increase in studies using methods focused on finding new developers or identifying components present in fingerprints by rapid tests. This systematic review of analytical techniques applied to the detection of fingerprints explores different approaches to contribute to future studies in forensic identification, verifying new demands in the forensic sciences and assisting in the selection of studies for the progress of research.
Drug Analytical Research, 2017
Background: Cannabis has been the most widely used illicit drug worldwide throughout many years. ... more Background: Cannabis has been the most widely used illicit drug worldwide throughout many years. Reports from different countries indicate that the potency of cannabis preparation has been increasing, as well as the ratio of tetrahydrocannabinol/cannabidiol has been changing. The high consumption along with the changing chemical profile of the drug has led increasingly to the interest in researching the cannabis plant. Methods: This article reviews available literature on the analytical methods currently used for the detection and quantification of cannabinoids in cannabis plant. The papers were screened by two researchers independently and following a pre-specified protocol. Results and Discussion: The systematic review of the literature allowed to include 42 citations on cannabis plant analysis. Conclusions: The analytical methods for cannabis material published in the included articles of this systematic review showed a lack of relevant information of the development of methods o...
Argentine Journal of Cardiology, Mar 27, 2012
Introducción La hipertensión arterial (HTA) es uno de los principales factores de riesgo de enfer... more Introducción La hipertensión arterial (HTA) es uno de los principales factores de riesgo de enfermedad cardiovascular. Su prevalencia ha aumentado debido a la mayor expectativa de vida y a la mayor prevalencia de obesidad en la población. La escasez de datos epidemiológicos actualizados en nuestro país hizo necesario el diseño del estudio RENATA (REgistro NAcional de hiperTensión Arterial). Objetivos Actualizar la prevalencia, el grado de conocimiento, el tratamiento y el control de la HTA en la Argentina. Material y métodos Se trata de un estudio transversal basado en encuestas que se realizaron en forma aleatorizada a individuos en siete ciudades del país. La presión arterial (PA) se midió con un tensiómetro automático en tres ocasiones y se consideró para el análisis el promedio de la segunda y la tercera medición.
Brazilian Journal of Forensic Sciences, Medical Law and Bioethics, 2020
Marijuana is the most popular form of Cannabis sativa L. (Cannabaceae), popularly known, in Brazi... more Marijuana is the most popular form of Cannabis sativa L. (Cannabaceae), popularly known, in Brazil, as the illicit drug. It is composed of the plant’s aerial parts, such as the leaves and the inflorescences, which are dried, pressed and prepared as a mixture for smoking. Cannabis is the most consumed and illegally trafficked drug in the world, with an increasing number of users every year. The plant can be grown indoor and outdoor, and these differences may influence the drug’s potency. In addition, marijuana can be mixed with diluents and/or adulterants such as aromatic plants, soil, commercial tobacco and feces that may contribute to cases of addiction and lead to serious health risks to its consumers. Studies involving the chemical profile of drug samples are important to provide evidence for trafficking, supporting the materiality of the crimes. The aim of this study is to analyze cannabis and marijuana seized samples by FTIR-ATR (range 1800-880 cm), combined with unsupervised c...
Brazilian Journal of Analytical Chemistry, 2021
The temporal estimation of the fingermarks deposition at crime scenes is a recurring issue in for... more The temporal estimation of the fingermarks deposition at crime scenes is a recurring issue in forensic identification. To study this challenging topic, a preliminary study was proposed to develop a method of fingermark analysis by Fourier Transform Infrared Microscopy (µ-FTIR), using chemometric tools for time separation in a six-day aging study. The samples were collected and analyzed at hour zero, 3 days (72 hours), 4 days (96 hours), 5 days (120 hours) and 6 days (144 hours). The samples were separated into a calibration set and a test set, using Kennard Stone. Following, a comparison between variable selection tools was made of the Ant of Colony (AOC) and the Genetic Algorithm (GA) were used with subsequent application of the Linear Discriminant Analysis (LDA). The results showed that in the analyzed samples there was a predominance of sebaceous material because of the presence of saturated esters signals, with two regions of interest in the infrared spectra, the first being 180...
Brazilian Journal of Analytical Chemistry, 2021
Questioned documents comprehend analysis of identity theft, forged signatures or texts, documents... more Questioned documents comprehend analysis of identity theft, forged signatures or texts, documents alterations and falsification of security documents or banknotes. Questions involving inks or paper require chemical analysis, and multivariate analysis or chemometrics has been an emerging tool for data evaluation and interpretation after instrumental data collection in this area. The goal of this study is to identify previous articles that applied multivariate analysis within questioned documents for forensic purposes. The search for articles was performed in four databases (Google Scholar, Science Direct, Pubmed and Scopus). Sixty studies, published in the last ten years, were selected. Thirty-four articles described pen inks analysis; fourteen articles comprehended printed documents studies; eight articles evaluated paper analysis, and four articles included banknotes analysis. Spectroscopy, mass spectrometry, chromatography, thermo gravimetric analysis and multivariate image analys...
Revista Brasileira de Ciências Policiais, 2020
Cannabis sativa L is one of the most used drugs in the world. Information about the plant’s age a... more Cannabis sativa L is one of the most used drugs in the world. Information about the plant’s age and storage can help forensic scientists to identify and to track samples. The ratio between the cannabinoids tetrahydrocannabinol (THC) and cannabinol (CBN) has been related to the degradation of cannabis with time. Thus, this study aimed to test Multivariate Image Analysis (MIA) to evaluate cannabis extracts concerning its colors. Initially, 52 samples of Cannabis sativa L. extracts were analyzed by Gas Chromatography coupled to Flame Ionization Detector (GC/FID) to quantify THC and CBN. Afterwards, the extract samples were photographed and analyzed by two different multivariate analysis tools: ChemoStat®, a free chemometrics software, and PhotoMetrix PRO®, an app for mobile devices. Using exploratory analysis of principal component analysis (PCA) and hierarchical cluster analysis (HCA). It was observed that the more intense the color for an extract, the higher concentration of THC and ...
Journal of Forensic Sciences, 2020
This systematic review deals with the last 10 years of research in analytical methodologies for t... more This systematic review deals with the last 10 years of research in analytical methodologies for the analysis of fingerprints, regarding their chemical and biological constituents. A total of 123 manuscripts, which fit the search criteria defined using the descriptor "latent fingermarks analysis," were selected. Its main instrumental areas (mass spectrometry, spectroscopy, and innovative methods) were analyzed and summarized in a specific table, highlighting its main analytical parameters. The results show that most studies in this field use mass spectrometry to identify the constituents of fingerprints, both to determine the chemical profile and for aging. There is also a marked use of mass spectrometry coupled with chromatographic methods, and it provides accurate results for a fatty acid profile. Additional significant results are achieved by spectroscopic methods, mainly Raman and infrared. It is noteworthy that spectroscopic methods using microscopy assist in the accuracy of the analyzed region of the fingerprint, contributing to more robust results. There was also a significant increase in studies using methods focused on finding new developers or identifying components present in fingerprints by rapid tests. This systematic review of analytical techniques applied to the detection of fingerprints explores different approaches to contribute to future studies in forensic identification, verifying new demands in the forensic sciences and assisting in the selection of studies for the progress of research.
Drug Analytical Research, 2017
Background: Cannabis has been the most widely used illicit drug worldwide throughout many years. ... more Background: Cannabis has been the most widely used illicit drug worldwide throughout many years. Reports from different countries indicate that the potency of cannabis preparation has been increasing, as well as the ratio of tetrahydrocannabinol/cannabidiol has been changing. The high consumption along with the changing chemical profile of the drug has led increasingly to the interest in researching the cannabis plant. Methods: This article reviews available literature on the analytical methods currently used for the detection and quantification of cannabinoids in cannabis plant. The papers were screened by two researchers independently and following a pre-specified protocol. Results and Discussion: The systematic review of the literature allowed to include 42 citations on cannabis plant analysis. Conclusions: The analytical methods for cannabis material published in the included articles of this systematic review showed a lack of relevant information of the development of methods o...
Argentine Journal of Cardiology, Mar 27, 2012
Introducción La hipertensión arterial (HTA) es uno de los principales factores de riesgo de enfer... more Introducción La hipertensión arterial (HTA) es uno de los principales factores de riesgo de enfermedad cardiovascular. Su prevalencia ha aumentado debido a la mayor expectativa de vida y a la mayor prevalencia de obesidad en la población. La escasez de datos epidemiológicos actualizados en nuestro país hizo necesario el diseño del estudio RENATA (REgistro NAcional de hiperTensión Arterial). Objetivos Actualizar la prevalencia, el grado de conocimiento, el tratamiento y el control de la HTA en la Argentina. Material y métodos Se trata de un estudio transversal basado en encuestas que se realizaron en forma aleatorizada a individuos en siete ciudades del país. La presión arterial (PA) se midió con un tensiómetro automático en tres ocasiones y se consideró para el análisis el promedio de la segunda y la tercera medición.