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https://www.readbyqxmd.com/read/29772778/visual-and-colorimetric-sensing-of-metsulfuron-methyl-by-exploiting-hydrogen-bond-induced-anti-aggregation-of-gold-nanoparticles-in-the-presence-of-melamine
#1
Guangyang Liu, Ruonan Zhang, Xiaodong Huang, Lingyun Li, Naixin Liu, Jing Wang, Donghui Xu
Various highly sensitive and selective analytical methods have been used to monitor metsulfuron-methyl residue in the environment. However, these methods involve costly instruments and complex, time-consuming operations performed in laboratories. Here, a rapid, convenient, and sensitive colorimetric sensor based on anti-aggregation of gold nanoparticles (AuNPs) is demonstrated for the rapid detection of metsulfuron-methyl in agricultural irrigation water. The AuNPs could be induced to aggregate in the presence of melamine and exhibited a distinct color change from wine-red to blue...
May 17, 2018: Sensors
https://www.readbyqxmd.com/read/29759175/gold-nanoparticle-aggregation-colorimetric-detection-of-the-interactions-between-avidin-and-biotin
#2
Dongmin Shi, Feifan Sheng, Xiaojun Zhang, Guangfeng Wang
This paper reported a novel colorimetric assay strategy for avidin and biotin interactions based on terminal protection of the biotinylated single-stranded DNA and the surface plasmon resonance adsorption of gold nanoparticles (AuNPs). In this assay, it was firstly found that biotin-ssDNA specifically bound to the target protein avidin with strong affinity could be protected from hydrolysis by exonuclease I (Exo I). Furthermore, a colorimetric strategy was designed for the detection of avidin and biotin interactions...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29759108/a-western-dietary-pattern-is-prospectively-associated-with-cardio-metabolic-traits-and-incidence-of-the-metabolic-syndrome
#3
Isabel Drake, Emily Sonestedt, Ulrika Ericson, Peter Wallström, Marju Orho-Melander
The aim of this study was to derive dietary patterns associated with cardio-metabolic traits and to examine whether these predict prospective changes in these traits and incidence of the metabolic syndrome (iMetS). Subjects from the Malmö Diet and Cancer Study cardiovascular cohort without cardio-metabolic disease and related drug treatments at baseline (n 4071; aged 45-67 years, 40 % men) were included. We applied reduced rank regression on thirty-eight foods to derive patterns that explain variation in response variables measured at baseline (waist circumference, TAG, HDL- and LDL-cholesterol, systolic and diastolic blood pressure, fasting glucose and insulin)...
May 2018: British Journal of Nutrition
https://www.readbyqxmd.com/read/29757205/label-free-g-quadruplex-aptamer-fluorescence-assay-for-ochratoxin-a-using-a-thioflavin-t-probe
#4
Kefeng Wu, Changbei Ma, Han Zhao, Hailun He, Hanchun Chen
Ochratoxin A (OTA) is one of the most common mycotoxins contaminating feed and foodstuffs. Therefore, a great deal of concern is associated with AFB1 toxicity. In this work, a fast and sensitive fluorescence aptamer biosensor has been proposed for the OTA assay. In the absence of OTA, the OTA aptamer can form a G-quadruplex structure with thioflavin T (ThT) dye, which results in increased fluorescence. After joining OTA, OTA aptamer combines with OTA and the G-quadruplex can be formed. Only faint fluorescence was finally observed when ThT weakly reacts with the quadruplex...
May 12, 2018: Toxins
https://www.readbyqxmd.com/read/29757003/transglutaminase-2-mediates-the-cytotoxicity-of-resveratrol-in-a-human-cholangiocarcinoma-and-gallbladder-cancer-cell-lines
#5
Leda Roncoroni, Luca Elli, Paola Braidotti, Delfina Tosi, Valentina Vaira, Lorenza Tacchini, Vincenza Lombardo, Federica Branchi, Alice Scricciolo, Luisa Doneda
Resveratrol is a polyphenolic compound extracted from plants and is also a constituent of red wine. Our aim was to evaluate if the cytotoxic effect of resveratrol (RES) on cholangiocarcinoma (CC) and gallbladder cancer (GBC) cell lines could be abolished by TG2 inhibition. Human CC and GBC cell lines (SK-ChA-1 and MZ-ChA-1), grown in a three-dimensional cell culture system (MCTS, multicellular tumor spheroids), were treated for 72 h with RES (32, 64 µM) alone or combined with different TG2 inhibitors (Cystamine, B003, T101)...
May 14, 2018: Nutrition and Cancer
https://www.readbyqxmd.com/read/29756977/effects-of-red-wine-grape-juice-and-resveratrol-consumption-on-bone-parameters-of-wistar-rats-submitted-to-high-fat-diet-and-physical-training
#6
Letícia Monteiro da Fonseca Cardoso, Nina Da Matta Alvarez Pimenta, Raiza Da Silva Ferreira Fiochi, Bruna Ferreira Mota Mota, Juliana Arruda de Souza Monnerat, Cristiane Correia Teixeira, Renata Beatriz Da Rocha Ramalho, Isabelle Waleska Maldronato, Manuela Dolisnky, Gilson Teles Boaventura, Vilma Blondet, Sergio Girão Barroso, Carlos Alberto Soares da Costa, Gabrielle De Souza Rocha
INTRODUCTION: intake of diets with high saturated fat may produce deleterious effects on bone mineralization. Lifestyle changes help reduce the bone loss observed in osteoporosis. Resveratrol, present in grape juice and red wine, has osteogenic and osteoinductive effects, being potentially beneficial for bone health. OBJECTIVE: to evaluate the effects of red grape juice, red wine and resveratrol consumption on bone parameters in Wistar rats submitted to a high-fat diet and physical training...
October 27, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/29755971/impact-of-increasing-levels-of-oxygen-consumption-on-the-evolution-of-color-phenolic-and-volatile-compounds-of-nebbiolo-wines
#7
Maurizio Petrozziello, Fabrizio Torchio, Federico Piano, Simone Giacosa, Maurizio Ugliano, Antonella Bosso, Luca Rolle
Since the end of the last century, many works have been carried out to verify the effect of controlled oxygen intake on the chemical and organoleptic characteristics of red wines. In spite of the large number of studies on this subject, oxygen remains a cutting-edge research topic in oenology. Oxygen consumption leads to complex and not univocal changes in wine composition, sometimes positive such as color stabilization, softening of mouthfeel, increase of aroma complexity. However, the variability of these effects, which depend both on the oxygenation conditions and the composition of the wine, require more efforts in this research field to effectively manage wine oxygen exposure...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29754612/development-of-extremely-stable-dual-functionalized-gold-nanoparticles-for-effective-colorimetric-detection-of-clenbuterol-and-ractopamine-in-human-urine-samples
#8
Turibius Simon, Muthaiah Shellaiah, Perpectual Steffi, Kien Wen Sun, Fu-Hsiang Ko
New glutamic acid (Glu) and polyethylenimine (PE) functionalized ultra-stable gold nanoparticles (PE-Glu-AuNPs) were developed via a simple NaBH4 reduction method. The low toxicity and biocompatibility of PE-Glu-AuNPs were confirmed via an MTT assay in Raw 264.7 cells. Excitingly, PE-Glu-AuNPs were found to be extremely stable at room temperature up to six months and were utilized in an effective colorimetric naked eye assay of clenbuterol (CLB) and ractopamine (RCT) at pH 5. It was found that the selective assay of CLB and RCT is not affected by any other interferences (such as alanine, phenylalanine, NaCl, CaCl2 , threonine, cysteine, glycine, glucose, urea and salbutamol)...
September 6, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29751487/preparation-and-antioxidant-activity-of-ethyl-linked-anthocyanin-flavanol-pigments-from-model-wine-solutions
#9
Lingxi Li, Minna Zhang, Shuting Zhang, Yan Cui, Baoshan Sun
Anthocyanin-flavanol pigments, formed during red wine fermentation and storage by condensation reactions between anthocyanins and flavanols (monomers, oligomers, and polymers), are one of the major groups of polyphenols in aged red wine. However, knowledge of their biological activities is lacking. This is probably due to the structural diversity and complexity of these molecules, which makes the large-scale separation and isolation of the individual compounds very difficult, thus restricting their further study...
May 3, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29748090/non-targeted-glycosidic-profiling-of-international-wines-using-neutral-loss-high-resolution-mass-spectrometry
#10
C Barnaba, E Dellacassa, G Nicolini, T Nardin, M Serra, R Larcher
Many metabolites naturally occur as glycosides, since sugar moieties can be crucial for their biological activity and increase their water solubility. In the plant kingdom they may occur as glycosides or sugar esters, depending on precursor chemical structure, and in wine they have traditionally attracted attention due to their organoleptic properties, such as astringency and bitterness, and because they affect the colour and aroma of wines. A new approach directed at detailed description of glycosides in a large selection of monovarietal wines (8 samples each of Pinot Blanc, Muller Thurgau, Riesling, Traminer, Merlot, Pinot Noir and Cabernet Sauvignon) was developed by combining high performance liquid chromatography with high resolution tandem mass spectrometry...
May 4, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29747754/mechanism-of-resveratrol-induced-relaxation-of-the-guinea-pig-fundus
#11
Ching-Chung Tsai, Shu-Leei Tey, Ming-Che Lee, Ching-Wen Liu, Yu-Tsun Su, Shih-Che Huang
BACKGROUND: Resveratrol is a polyphenolic compound that can be isolated from plants and also is a constituent of red wine. Resveratrol induces relaxation of vascular smooth muscle and may prevent cardiovascular diseases. PURPOSE: Impaired gastric accommodation plays an important role in functional dyspepsia and fundic relaxation and is a therapeutic target of functional dyspepsia. Although drugs for fundic relaxation have been developed, these types of drugs are still rare...
April 1, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29747446/evaluation-of-the-impact-of-storage-conditions-on-the-biogenic-amines-profile-in-opened-wine-bottles
#12
Justyna Płotka-Wasylka, Vasil Simeonov, Jacek Namieśnik
A survey of biogenic amine (BA) profiles in opened wine bottles has been established to monitor the level of biogenic amines (BAs) in opened bottles against time and other conditions. Bottles of red and white wine were submitted to different temperatures, stopper type (screw cap, cork), and use of vacuum devices. A total of six wines made from a variety of grapes were obtained from vineyards from regions across Poland. Dispersive liquid-liquid microextraction-gas chromatography-mass spectrometry (DLLME-GC-MS) procedure for BAs determination was validated and applied for wine sample analysis...
May 9, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29742202/chemistry-inspired-by-the-colors-of-fruits-flowers-and-wine
#13
Frank H Quina, Erick L Bastos
An overview is provided of the status of research at the frontiers of investigation of the chemistry and photochemistry of two classes of natural plant pigments, the anthocyanins and the betalains, as well as of the pyranoanthocyanin pigments formed from anthocyanins during the maturation of red wine. Together, anthocyanins and betalains are responsible for almost all of the red, purple and blue colors of fruits and flowers and anthocyanins and pyranoanthocyanins are major contributors to the color of red wines...
2018: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/29740576/monitoring-the-phenolic-ripening-of-red-grapes-using-a-multisensor-system-based-on-metal-oxide-nanoparticles
#14
Celia Garcia-Hernandez, Cristina Medina-Plaza, Cristina Garcia-Cabezon, Yolanda Blanco, Jose A Fernandez-Escudero, Enrique Barajas-Tola, Miguel A Rodriguez-Perez, Fernando Martin-Pedrosa, Maria L Rodriguez-Mendez
The maturity of grapes is usually monitored by means of the sugar concentration. However, the assessment of other parameters such as the phenolic content is also important because the phenolic maturity has an important impact on the organoleptic characteristics of wines. In this work, voltammetric sensors able to detect phenols in red grapes have been developed. They are based on metal oxide nanoparticles (CeO2 , NiO, and TiO2 ,) whose excellent electrocatalytic properties toward phenols allows obtaining sensors with detection limits in the range of 10-8 M and coefficients of variation lower than 7%...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29740325/extract-enriched-in-flavan-3-ols-and-mainly-procyanidin-dimers-improves-metabolic-alterations-in-a-mouse-model-of-obesity-related-disorders-partially-via-estrogen-receptor-alpha
#15
Daniela Leonetti, Raffaella Soleti, Nicolas Clere, Luisa Vergori, Caroline Jacques, Lucie Duluc, Catherine Dourguia, Maria C Martínez, Ramaroson Andriantsitohaina
Red wine polyphenol extracts improve cardiovascular and metabolic disorders linked to obesity. Their vascular protection is mediated by the activation of the alpha isoform of the estrogen receptor (ERα). In the present study, we explored the effects of a grape seed extract (GSE) enriched in the flavan-3-ols procyanidin dimers on obesity-related cardiovascular and metabolic disorders; with a particular interest in the role/contribution of ERα. Ovariectomized wild type or ERα knockout (KO) mice were fed with standard or western diet, supplemented or not with GSE, for 12 weeks...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29739577/application-of-ultrasound-to-improve-lees-ageing-processes-in-red-wines
#16
Juan Manuel Del Fresno, Iris Loira, Antonio Morata, Carmen González, Jose Antonio Suárez-Lepe, Rafael Cuerda
Ageing on lees (AOL) is a technique that increases volatile compounds, promotes colour stability, improves mouthfeel and reduces astringency in red wines. The main drawback is that it is a slow process. Several months are necessary to obtain perceptible effects in wines. Different authors have studied the application of new techniques to accelerate the AOL process. Ultrasound (US) has been used to improve different food industry processes; it could be interesting to accelerate the yeast autolysis during AOL...
September 30, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29738816/can-red-light-5-aminolevulinic-photodynamic-therapy-cure-port-wine-stains-on-comb-animal-model
#17
Yongxian Lai, Haiyan Zhang, Minglei Wei, Jie Ji, Lei Shi, Peiru Wang, Bo Wang, Zheng Huang, Xiuli Wang
OBJECTIVE: To study the curative effect of red-light 5-Aminolevulinic photodynamic therapy(ALA-PDT) to port wine stains(PWS) on comb animal model. METHODS: 160 male cocks were randomly divided into 16 groups. The ALA only group was given ALA only topical or systemic application. Light only groups were only given 630 nm red light irradiation with different light density. ALA-PDT groups were given red light after the application of topical or systemic ALA. PDL group was given PDL irradiation...
May 5, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29735086/understanding-microoxygenation-effect-of-viable-yeasts-and-sulfur-dioxide-levels-on-the-sensory-properties-of-a-merlot-red-wine
#18
María-Pilar Sáenz-Navajas, Charlie Henschen, Annegret Cantu, Aude A Watrelot, Andrew L Waterhouse
No abstract text is available yet for this article.
June 2018: Food Research International
https://www.readbyqxmd.com/read/29735040/wine-aroma-response-to-different-participation-of-selected-hanseniaspora-uvarum-in-mixed-fermentation-with-saccharomyces-cerevisiae
#19
Kai Hu, Guo-Jie Jin, Yin-Hu Xu, Yong-Sheng Tao
Wine aroma response to a selected Hanseniaspora uvarum Yun268 strain was investigated using different inoculation strategies with commercial Saccharomyces cerevisiae yeast, namely, simultaneous fermentation (SiF), sequential fermentation (SeF), S. cerevisiae fermentation treated with extracellular extract of H. uvarum (EE), and pure S. cerevisiae fermentation (PF). Contributive volatiles in the perception of enhanced aroma traits were uncovered by partial least-squares regression. Results showed that controlled inoculation resulted into different amounts of H...
June 2018: Food Research International
https://www.readbyqxmd.com/read/29723528/resveratrol-induces-dynamic-changes-to-the-microglia-transcriptome-inhibiting-inflammatory-pathways-and-protecting-against-microglia-mediated-photoreceptor-apoptosis
#20
Johanna Wiedemann, Khalid Rashid, Thomas Langmann
Microglia activation is central to the pathophysiology of retinal degenerative disorders. Resveratrol, a naturally occurring non-flavonoid phenolic compound present in red wine has potent anti-inflammatory and immunomodulatory properties. However, molecular mechanisms by which resveratrol influences microglial inflammatory pathways and housekeeping functions remain unclear. Here, we first studied the immuno-modulatory effects of resveratrol on BV-2 microglial cells at the transcriptome level using DNA-microarrays and selected qRT-PCR analyses...
April 30, 2018: Biochemical and Biophysical Research Communications
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