The Experts below are selected from a list of 6093 Experts worldwide ranked by ideXlab platform
R H Wilson - One of the best experts on this subject based on the ideXlab platform.
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Potential of Fourier transform infrared spectroscopy for the authentication of vegetable oils
Journal of Agricultural and Food Chemistry, 1994Co-Authors: Y. W. Lai, E. Kate Kemsley, R H WilsonAbstract:Fourier transform infrared (FTIR) spectroscopy was used in conjunction with principal component analysis (PCA) and discriminant analysis to investigate the potential of the technique for determining the Authenticity of vegetable oils. PCA applied to spectra from a range of seed oils revealed clustering according to plant species. When extra virgin and refinded olive oils were subjected to discriminant analysis, 93% of samples in a calibration set and 100% of samples in an independent validation set were correctly classified, despite these two types of oil being chemically and spectroscopically very similar. The method, therefore, has potential as a rapid method for the determination of Product Authenticity
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Determination of the fruit content of jam using Fourier transform infrared spectroscopy
Food Chemistry, 1993Co-Authors: R H Wilson, P.t. Slack, G.p. Appleton, Li Sun, Peter S. BeltonAbstract:Abstract An investigation into the potential of Fourier transform infrared spectroscopy for the determination of the fruit content of jam is reported. A quantitative method was developed using dried jam and the potassium bromide pellet technique, in combination with simple linear regression and partial least squares (PLS) analysis. The PLS method gave the best results and showed that the determination of fruit content is feasible in strawberry jam. A second method, using diffuse reflectance of jam solids washed on filter papers, produced spectra of unusual appearance, but was able to distinguish reproducibly between jams of differing fruit content. Therefore, such a method has potential for the verification of Product Authenticity and the detection of adulteration.
Shuming Yang - One of the best experts on this subject based on the ideXlab platform.
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Recent developments in application of stable isotope analysis on agro-Product Authenticity and traceability.
Food chemistry, 2013Co-Authors: Yan Zhao, Bin Zhang, Gang Chen, Ailiang Chen, Shuming YangAbstract:With the globalisation of agro-Product markets and convenient transportation of food across countries and continents, the potential for distribution of mis-labelled Products increases accordingly, highlighting the need for measures to identify the origin of food. High quality food with identified geographic origin is a concern not only for consumers, but also for agriculture farmers, retailers and administrative authorities. Currently, stable isotope ratio analysis in combination with other chemical methods gradually becomes a promising approach for agro-Product Authenticity and traceability. In the last five years, a growing number of research papers have been published on tracing agro-Products by stable isotope ratio analysis and techniques combining with other instruments. In these reports, the global variety of stable isotope compositions has been investigated, including light elements such as C, N, H, O and S, and heavy isotopes variation such as Sr and B. Several factors also have been considered, including the latitude, altitude, evaporation and climate conditions. In the present paper, an overview is provided on the Authenticity and traceability of the agro-Products from both animal and plant sources by stable isotope ratio analysis.
Ayse Ozgur Uncu - One of the best experts on this subject based on the ideXlab platform.
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A Cost-Efficient and Simple Plant Oil DNA Extraction Protocol Optimized for DNA-Based Assessment of Product Authenticity
Food Analytical Methods, 2018Co-Authors: Emrah Torlak, Ayse Ozgur UncuAbstract:DNA-based assays offer precision in ascertaining the species/cultivar origin of agro-food Products. Yet, obtaining DNA of sufficient quality and quantity is the main challenge while performing DNA-based food authentication analyses. The aim of the present work was to standardize a cost-efficient, easy-to-apply, yet effective plant oil DNA isolation protocol that allows reliable downstream PCR-based analyses. Because capillary electrophoresis (CE) separation of species/cultivar discriminating genomic fragments is a widely adopted approach in food genomics, a CE system was utilized in order to assess the performance of the proposed cetyl trimethyl ammonium bromide (CTAB)-based protocol. A plastid intergenic spacer and a nuclear olive gene were used as targets in order to evaluate the amplificability of DNA extracted with the CTAB-based protocol. The plastid barcode not only allowed assessing the reproducibility of PCR amplifications from the extracted oil DNA samples (olive, hazelnut, corn, rapeseed, cottonseed, and soybean oils) but also proved successful in discriminating all tested oil crop species based on amplified fragment length polymorphisms. Moreover, the barcode assay proved successful in correctly identifying the tested olive oil: cottonseed oil blends as admixtures of the two oil species. Thus, it was also feasible to demonstrate the potential of the barcode sequence as a discriminatory analyte to detect adulteration in plant oils. In addition, application of a CAPS (cleaved amplified polymorphic sequence) assay designed to genotype a nuclear SNP (single nucleotide polymorphism) marker resulted in the successful identification of the two single-cultivar olive oils included in the study. As a result of the present work, it was feasible to standardize a reliable and cost-efficient DNA extraction protocol that works well with both unrefined (olive and hazelnut) and refined (corn, rapeseed, cottonseed, and soybean) oils.
Torsten C Schmidt - One of the best experts on this subject based on the ideXlab platform.
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Carbon isotope ratio measurements of glyphosate and AMPA by liquid chromatography coupled to isotope ratio mass spectrometry
Analytical and Bioanalytical Chemistry, 2013Co-Authors: Dorothea Kujawinski, J. Benjamin Wolbert, Lijun Zhang, Maik Jochmann, David Widory, Nicole Baran, Torsten C SchmidtAbstract:The interest in compound-specific isotope analysis for Product Authenticity control and source differentiation in environmental sciences has grown rapidly during the last decade. However, the isotopic analysis of very polar analytes is a challenging task due to the lack of suitable chromatographic separation techniques which can be used coupled to isotope ratio mass spectrometry. In this work, we present the first method to measure carbon isotope compositions of the widely applied herbicide glyphosate and its metabolite aminomethylphosphonic acid (AMPA) by liquid chromatography coupled to isotope ratio mass spectrometry. We demonstrate that this analysis can be carried out either in cation exchange or in reversed-phase separation modes. The reversed-phase separation yields a better performance in terms of resolution compared with the cation exchange method. The measurement of commercial glyphosate herbicide samples show its principal applicability and reveals a wide range of δ^13C values between −24 and −34 ‰ for different manufacturers. The absolute minimum amounts required to perform a precise and accurate determination of carbon isotope compositions of glyphosate and AMPA were in the sub-microgram range. The method proposed is sensitive enough to further perform the experiments that are necessary to better understand the carbon isotope fractionation associated to the natural degradation of glyphosate into AMPA. Furthermore, it can be used for contaminant source allocation and Product Authenticity as well.
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Carbon isotope ratio measurements of glyphosate and AMPA by liquid chromatography coupled to isotope ratio mass spectrometry
Analytical and Bioanalytical Chemistry, 2013Co-Authors: Dorothea Kujawinski, J. Benjamin Wolbert, Lijun Zhang, Maik Jochmann, David Widory, Nicole Baran, Torsten C SchmidtAbstract:The interest in compound-specific isotope analysis for Product Authenticity control and source differentiation in environmental sciences has grown rapidly during the last decade. However, the isotopic analysis of very polar analytes is a challenging task due to the lack of suitable chromatographic separation techniques which can be used coupled to isotope ratio mass spectrometry. In this work, we present the first method to measure carbon isotope compositions of the widely applied herbicide glyphosate and its metabolite aminomethylphosphonic acid (AMPA) by liquid chromatography coupled to isotope ratio mass spectrometry. We demonstrate that this analysis can be carried out either in cation exchange or in reversed-phase separation modes. The reversed-phase separation yields a better performance in terms of resolution compared with the cation exchange method. The measurement of commercial glyphosate herbicide samples show its principal applicability and reveals a wide range of delta C-13 values between -24 and -34 aEuro degrees for different manufacturers. The absolute minimum amounts required to perform a precise and accurate determination of carbon isotope compositions of glyphosate and AMPA were in the sub-microgram range. The method proposed is sensitive enough to further perform the experiments that are necessary to better understand the carbon isotope fractionation associated to the natural degradation of glyphosate into AMPA. Furthermore, it can be used for contaminant source allocation and Product Authenticity as well.
Yan Zhao - One of the best experts on this subject based on the ideXlab platform.
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Recent developments in application of stable isotope analysis on agro-Product Authenticity and traceability.
Food chemistry, 2013Co-Authors: Yan Zhao, Bin Zhang, Gang Chen, Ailiang Chen, Shuming YangAbstract:With the globalisation of agro-Product markets and convenient transportation of food across countries and continents, the potential for distribution of mis-labelled Products increases accordingly, highlighting the need for measures to identify the origin of food. High quality food with identified geographic origin is a concern not only for consumers, but also for agriculture farmers, retailers and administrative authorities. Currently, stable isotope ratio analysis in combination with other chemical methods gradually becomes a promising approach for agro-Product Authenticity and traceability. In the last five years, a growing number of research papers have been published on tracing agro-Products by stable isotope ratio analysis and techniques combining with other instruments. In these reports, the global variety of stable isotope compositions has been investigated, including light elements such as C, N, H, O and S, and heavy isotopes variation such as Sr and B. Several factors also have been considered, including the latitude, altitude, evaporation and climate conditions. In the present paper, an overview is provided on the Authenticity and traceability of the agro-Products from both animal and plant sources by stable isotope ratio analysis.