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Articles 1021 - 1050 of 1084
Full-Text Articles in Toxicology
Rapid Identification Of Nicotine In Electronic Cigarette Liquids Based On Surface-Enhanced Raman Scattering, Jun-Yi Chien, Yong-Chun Gu, Hsin-Mei Tsai, Chun-Hao Liu, Chia-Yuan Yen, Yuh-Lin Wang, Juen-Kai Wang, Chi-Hung Lin
Rapid Identification Of Nicotine In Electronic Cigarette Liquids Based On Surface-Enhanced Raman Scattering, Jun-Yi Chien, Yong-Chun Gu, Hsin-Mei Tsai, Chun-Hao Liu, Chia-Yuan Yen, Yuh-Lin Wang, Juen-Kai Wang, Chi-Hung Lin
Journal of Food and Drug Analysis
Nicotine-containing electronic cigarette liquid (e-liquid) is prohibited in many countries, creating requirements for rapid detection approaches for on-site inspection or screening for large amounts of samples. Here, we demonstrate a simple way to identify nicotine using surface-enhanced Raman scattering (SERS) with substrates made of silver nanoparticle arrays imbedded in anodic aluminum oxide nanochannels (Ag/AAO). Compared with the reported colloidal nanoparticle-based SERS, that required serial dilutions to enable colloid aggregation in the viscous e-liquid, a small amount of undiluted e-liquid sample can be directly added onto our solid-phase Ag/AAO substrate without any pre-treatment. The sensitivity of our SERS measurements is 2e3 …
A Multi-Analyte Lc-Ms/Ms Method For Screening And Quantification Of Nitrosamines In Sartans, Shu-Han Chang, Ching-Chia Chang, Li-Jing Wang, Wei-Ching Chen, Shu-Yu Fan, Chi-Zong Zang, Ya-Hui Hsu, Mei-Chih Lin, Su-Hsiang Tseng, Der-Yuan Wang
A Multi-Analyte Lc-Ms/Ms Method For Screening And Quantification Of Nitrosamines In Sartans, Shu-Han Chang, Ching-Chia Chang, Li-Jing Wang, Wei-Ching Chen, Shu-Yu Fan, Chi-Zong Zang, Ya-Hui Hsu, Mei-Chih Lin, Su-Hsiang Tseng, Der-Yuan Wang
Journal of Food and Drug Analysis
An incident of sartan medicine contamination was notified by Europe in June 2018. The contaminant was identified as a probable carcinogenic nitrosamine and the recalls of sartan medicines were soon made. Since then, more nitrosamine contaminants in sartan medicines were reported. To broaden the applicability and variety in nitrosamine determination, a multi-analyte method is required. In this study, a feasible and sensitive multi-analyte LC-MS/MS method for determination of 12 nitrosamines in sartans was established, where the active pharmaceutical ingredients and final products merchandised in Taiwan were also examined. Chromatographic separation was achieved on an Xselect® HSS T3 column (15 cm …
Anti-Inflammatory Effects Of Peptides From A Marine Algicolous Fungus Acremonium Sp. Ntu492 In Bv-2 Microglial Cells, George Hsiao, Shih-Wei Wang, Yin-Ru Chiang, Wei-Chiung Chi, Yueh-Hsiung Kuo, Do Anh Phong, Chia-Yu Chen, Tzong-Huei Lee
Anti-Inflammatory Effects Of Peptides From A Marine Algicolous Fungus Acremonium Sp. Ntu492 In Bv-2 Microglial Cells, George Hsiao, Shih-Wei Wang, Yin-Ru Chiang, Wei-Chiung Chi, Yueh-Hsiung Kuo, Do Anh Phong, Chia-Yu Chen, Tzong-Huei Lee
Journal of Food and Drug Analysis
Located in tropical and subtropical region, Taiwan is an island with high algal species diversity. In this study, a number of fungal strains were isolated from marine macroalgae collected from northeastern intertidal zone of Taiwan. Preliminary anti-inflammatory screening has shown that the methanolic extracts of solid fermented products of the red alga Mastophora rosea-derived fungal strain Acremonium sp. NTU492 exhibited significant bioactivity. In an attempt to disclose the active principles from this fungal strain, a series of separation and purification was thus undertaken, which has led to the isolation and characterization of seven compounds including four new peptides, namely acrepeptins …
A Rapid Strategy For Screening High-Efficiency Pcsk9 Inhibitors From Ginkgo Biloba Leaves By Ligand Fishing, Hplc-Q-Tof-Ms And Interdisciplinary Assay, Li Li, Meng-Lin Fan, Ya-Nan Li, Ya-Xuan Huang, Xiu-Feng Liu, Ji-Hua Liu
A Rapid Strategy For Screening High-Efficiency Pcsk9 Inhibitors From Ginkgo Biloba Leaves By Ligand Fishing, Hplc-Q-Tof-Ms And Interdisciplinary Assay, Li Li, Meng-Lin Fan, Ya-Nan Li, Ya-Xuan Huang, Xiu-Feng Liu, Ji-Hua Liu
Journal of Food and Drug Analysis
Proprotein convertase subtilisin/kexin type 9 (PCSK9) is an attractive target for new cholesterol-lowering drug development. Here, we developed a method integrating ligand fishing, HPLC-Q-TOF-MS and interdisciplinary assay, aiming to explore potential PCSK9 inhibitors from mixtures rapidly and accurately. PCSK9 was expressed and purified firstly, and then the recombined PCSK9 was coated on the surface of magnetic beads (MBs). The PCSK9-immobilized MBs (PCSK9-MBs) were used for ligand fishing combined with HPLC and Q-TOF-MS/MS. Ginkgo biloba leaves (GBL), an herbal medicine widely used in Asia and Europe with good efficacy in treatment of hypercholesterolemia, were chosen as an illustration for ligand fishing. …
Analysis Of Flavor And Other Metabolites In Lemon Juice (Citrus Limon) From Huanglongbing-Affected Trees Grafted On Different Rootstocks, Laura Reuss, Shi Feng, Wei-Lun Hung, Qibin Yu, Frederick G. Gmitter Jr, Yu Wang
Analysis Of Flavor And Other Metabolites In Lemon Juice (Citrus Limon) From Huanglongbing-Affected Trees Grafted On Different Rootstocks, Laura Reuss, Shi Feng, Wei-Lun Hung, Qibin Yu, Frederick G. Gmitter Jr, Yu Wang
Journal of Food and Drug Analysis
Flavor perception integrates sensory input from chemical receptors triggered by taste- and aroma-active metabolites to contribute to food flavor quality. Many factors alter flavor quality. Disease affects aroma and flavonoid constituents, causing off-flavors in plants. Huanglongbing (HLB) disease negatively affects citrus, although lemons are more tolerant. Lemon juice quality of HLB-affected fruits is not well studied. Lemon juice aroma-active compounds were profiled in this study using gas chromatography/mass spectrometry-olfactometry, and other metabolites contributing to overall flavor quality were investigated. Lemon juice from different rootstocks was discriminated using the metabolic profile. Flavor and other lemon juice metabolites also distinguished symptomatic from …
Chemometric Authentication Of Pu'er Teas In Terms Of Multielement Stable Isotope Ratios Analysis By Ea-Irms And Icp-Ms, Honglin Liu, Yitao Zeng, Xin Zhao, Huarong Tong
Chemometric Authentication Of Pu'er Teas In Terms Of Multielement Stable Isotope Ratios Analysis By Ea-Irms And Icp-Ms, Honglin Liu, Yitao Zeng, Xin Zhao, Huarong Tong
Journal of Food and Drug Analysis
In this work, the stable isotope ratios of carbon, nitrogen, hydrogen, oxygen, and mineral elements and their stoichiometric methods were examined as possible factors that could certify Chinese tea based on its production years. A total of 43 multi-element stable isotope ratios of Xiangzhujing Pu'er tea in five production years were determined through inductively coupled plasma mass spectrometry (ICP-MS) and elemental analyzer-isotope ratio mass spectrometry (EA-IRMS) methods. Two unsupervised learning techniques (principal component analysis and hierarchical clustering analysis) and three supervised learning techniques (partial least squares discriminant analysis [PLS-DA], back-propagation artificial neural network [BP-ANN], and linear discriminant analysis [LDA]) were …
The Chemical Aspects Of Raman Spectroscopy: Statistical Structure-Spectrum Relationship In The Analyses Of Bioflavonoids, Chih-Hsien Wang, Chia-Chi Huang, Wenlung Chen, Yen-Shi Lai
The Chemical Aspects Of Raman Spectroscopy: Statistical Structure-Spectrum Relationship In The Analyses Of Bioflavonoids, Chih-Hsien Wang, Chia-Chi Huang, Wenlung Chen, Yen-Shi Lai
Journal of Food and Drug Analysis
Raman spectroscopy has been accepted as a useful tool for the characterization of natural products. However, to identify a specific compound in a mixture sample of natural products using Raman spectra alone is highly challenging if not impossible. We demonstrated an effective solution to such issues using a method combining statistical Raman spectroscopy and Mass spectrometry. The method was validated with a successful application to the identification of the major anthocyanin components in a purple yam (Dioscorea purpurea) extract. Of particular interest is that statistical grouping of the bioflavonoid standards that formed the database of this study was found to …
Screening For Malachite Green Contamination On Live Fish Skin With Chewing Gum Based Viscoelastic Sers Sensor, Wan-Li Fan, Shi-Wei Yang, Dong-Mei Wang, Zheng-Jun Gong, Mei-Kun Fan
Screening For Malachite Green Contamination On Live Fish Skin With Chewing Gum Based Viscoelastic Sers Sensor, Wan-Li Fan, Shi-Wei Yang, Dong-Mei Wang, Zheng-Jun Gong, Mei-Kun Fan
Journal of Food and Drug Analysis
Malachite green (MG), a prohibited but still found antimicrobial in aquafarm and during live fish shipping, is a hot target in food safety screening. Herein, a novel chewing gum based flexible SERS (G-SERS) sensor was proposed for rapid sampling and detection of MG on live fish skin. The whole analysis takesmin, while the limit of detection for MG is 0.73 pg. Different from other reports, MG contaminated live fish was monitored daily with the G-SERS sensor, during which the fish was firstly raised in 0.5 ppm MG solution for one day, followed by freshwater for a week. It was found …
Uplc-Qtof-Ms Fingerprinting Combined With Chemometrics To Assess The Solvent Extraction Efficiency, Phytochemical Variation, And Antioxidant Activities Of Beta Vulgaris L., Junyi Wang, Guddadarangavvanahally Krishnareddy Jayaprakasha, Bhimanagouda S. Patil
Uplc-Qtof-Ms Fingerprinting Combined With Chemometrics To Assess The Solvent Extraction Efficiency, Phytochemical Variation, And Antioxidant Activities Of Beta Vulgaris L., Junyi Wang, Guddadarangavvanahally Krishnareddy Jayaprakasha, Bhimanagouda S. Patil
Journal of Food and Drug Analysis
Accurate assays of plant antioxidants and other phytochemicals require efficient extraction conditions and enable rigorous assessments of crop varieties and production systems. This study assessed the extraction of phytochemicals and antioxidants from conventionally or organically grown red and golden beets (Beta vulgaris L.), using twenty solvent (S1eS20) mixtures containing water, methanol, and ethanol alone or with acids (ascorbic, formic, acetic). Red beetroot extracted with methanol with or without acid had the highest betanin content (2791.0 mg/g and 8222.3 mg/g of fresh weight [FW], respectively) and golden beetroot extracted with methanol/ascorbic acid/water had the highest vulgaxanthin I (193.7 mg/g and 15.0 …
Food Preservative Sorbic Acid Deregulates Hepatic Fatty Acid Metabolism, Chia-Hui Chen, Sin-Ni Ho, Po-An Hu, Yu Ru Kou, Tzong-Shyuan Lee
Food Preservative Sorbic Acid Deregulates Hepatic Fatty Acid Metabolism, Chia-Hui Chen, Sin-Ni Ho, Po-An Hu, Yu Ru Kou, Tzong-Shyuan Lee
Journal of Food and Drug Analysis
Sorbic acid (SA) is one of the most commonly used food preservatives worldwide. Despite SA having no hepatotoxicity at legal dosages, its effect on hepatic lipid metabolism is still unclear. We investigated the effect of SA on hepatic lipid metabolism and its mechanism of action in C57BL/6 mice. Daily treatment with SA (1 g/kg in diet) for 4 weeks did not alter the body weight, organ weight, and blood lipids in mice. However, hepatic lipid accumulation, particularly that of triglycerides, fatty acids, and glycerol, but not cholesteryl ester and free cholesterol, was increased with SA treatment. Mechanistically, SA decreased the …
The Potential Role Of Phenolic Compounds On Modulating Gut Microbiota In Obesity, Gow-Chin Yen, Hsin-Lin Cheng, Li-Yu Lin, Shiuan-Chih Chen, Chin Lin Hsu
The Potential Role Of Phenolic Compounds On Modulating Gut Microbiota In Obesity, Gow-Chin Yen, Hsin-Lin Cheng, Li-Yu Lin, Shiuan-Chih Chen, Chin Lin Hsu
Journal of Food and Drug Analysis
Obesity is a rising public health issue and challenge which is tightly correlated with socio-economic development paralleled with increased energy intake and sedentary behavior that subsequently cause adipose tissue accumulation. Physiological and metabolic status changes during obesity development have been suggested with low grade inflammation of gastrointestinal tract. The gut microbiota plays an essential role in regulating whole body energy metabolism and also lipid accumulation, and immunity of host. However, the detail mechanism of which the gut microbiota composition influence obesity development in humans still need deeper investigation owing to the complex pathophysiology of such disease. Recently, the consumption of …
Sustainable Solutions, Fall/Winter 2020, Issue 41
Sustainable Solutions, Fall/Winter 2020, Issue 41
Sustain Magazine
No abstract provided.
Environmentally Responsible Land Use, Spring/Summer 2010, Issue 22
Environmentally Responsible Land Use, Spring/Summer 2010, Issue 22
Sustain Magazine
No abstract provided.
Sustainable Communities, Fall/Winter 2010, Issue 21
Sustainable Communities, Fall/Winter 2010, Issue 21
Sustain Magazine
No abstract provided.
Sustainable Building, Spring/Summer 2009, Issue 20
Sustainable Building, Spring/Summer 2009, Issue 20
Sustain Magazine
No abstract provided.
Environmental History, Fall/Winter 2009, Issue 19
Environmental History, Fall/Winter 2009, Issue 19
Sustain Magazine
No abstract provided.
Student Research, Spring/Summer 2008, Issue 18
Evolving Pollution Prevention, Fall/Winter 2008, Issue 17
Evolving Pollution Prevention, Fall/Winter 2008, Issue 17
Sustain Magazine
No abstract provided.
Climate Change, Spring/Summer 2007, Issue 16
Our Energy Future, Fall/Winter 2007, Issue 15
Land Conservation, Spring/Summer 2006, Issue 14
Land Conservation, Spring/Summer 2006, Issue 14
Sustain Magazine
No abstract provided.
Pollution And Heart Disease, Fall/Winter 2006, Issue 13
Pollution And Heart Disease, Fall/Winter 2006, Issue 13
Sustain Magazine
No abstract provided.
Green Cities, Spring/Summer 2005, Issue 12
Global Sustainability, Fall/Winter 2005, Issue 11
Global Sustainability, Fall/Winter 2005, Issue 11
Sustain Magazine
No abstract provided.
Environmental Justice, Spring/Summer 2004, Issue 10
Environmental Justice, Spring/Summer 2004, Issue 10
Sustain Magazine
No abstract provided.
Kentucky's Environmental Future, Fall/Winter 2004, Issue 9
Kentucky's Environmental Future, Fall/Winter 2004, Issue 9
Sustain Magazine
No abstract provided.
Urban Ecology, Spring/Summer 2003, Issue 8
Urban Regeneration, Fall/Winter 2003, Issue 7
Urban Air Quality, Spring/Summer 2002, Issue 6
Sustainability Of Industrialized Agriculture, Fall/Winter 2002, Issue 5
Sustainability Of Industrialized Agriculture, Fall/Winter 2002, Issue 5
Sustain Magazine
No abstract provided.