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https://www.readbyqxmd.com/read/28821347/stable-oil-laden-foams-formation-and-evolution
#1
REVIEW
Rémy Mensire, Elise Lorenceau
The interaction between oil and foam has been the subject of various studies. Indeed, oil can be an efficient defoaming agent, which can be highly valuable in various industrial applications where undesired foaming may occur, as seen in jet-dyeing processes or waste water treatment plant. However, oil and foam can also constructively interact as observed in detergency, fire-fighting, food and petroleum industries, where oil can be in the foam structure or put into contact with the foam without observing a catastrophic break-up of the foam...
August 2, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28810866/the-development-of-an-ivermectin-based-attractive-toxic-sugar-bait-atsb-to-target-anopheles-arabiensis
#2
Frank Chelestino Tenywa, Athumani Kambagha, Adam Saddler, Marta Ferreira Maia
BACKGROUND: An increasing number of countries in sub-Saharan Africa are moving towards malaria-elimination, mostly thanks to successful vector control campaigns. However, elimination has proven challenging, resulting in the persistence of malaria transmission. It is now accepted that in order to eliminate malaria, new complementary vector control approaches must be developed. This study describes the development of a sugar-baited resting place containing a toxic dose of ivermectin for the control of Anopheles arabiensis...
August 15, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28805014/time-temperature-indicator-based-on-enzymatic-degradation-of-dye-loaded-polyhydroxybutyrate
#3
Preetam Anbukarasu, Dominic Sauvageau, Anastasia L Elias
An enzyme activated time-temperature indicator (TTI) which produces a direct colour change concomitant to variations in integrated time and temperature conditions is described. This direct colour change is realised by degrading a dye-loaded polyhydroxybutyrate (PHB) film by a depolymerase enzyme. The degradation of the PHB film by the enzyme causes the release of the dye in solution, which in turn undergoes an optical transition from clear to coloured with elapsing time. Macroscopic and microscopic optical observations confirms the uniform distribution of the dye in the PHB film...
August 14, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28803003/pathogenic-features-and-characteristics-of-food-borne-pathogens-biofilm-biomass-viability-and-matrix
#4
REVIEW
Shiqi Lin, Ling Yang, Chen Gu, Bing Li, Dingqiang Chen, Lin Li, Zhenbo Xu
Biofilm is a ubiquitous growth pattern of bacterial species survival but is notorious for its threat on public health and food contamination. Extensive studies of the biofilm structure, formation, quantification, quorum sensing system and underlying control strategies have been reported during the past decades. Insightful elucidation of the pathogenic features and characteristic of bacterial biofilm can facilitate in devising appropriate control strategies for biofilm eradication. Therefore, this review mainly summarized the pathogenic features of biofilms from food borne microorganisms, including the biomass (which could be quantified using crystal violet and fluorogenic dye Syto9 assays), viability (which could be determined by tetrazolium salts, fluorescein diacetate, resazurin staining and alamar blue assays) and matrix (which are commonly detected by dimethyl methylene blue and wheat germ agglutinin assays)...
August 9, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28798884/spe-tlc-densitometric-quantification-of-selected-synthetic-food-dyes-in-liquid-foodstuffs-and-pharmaceutical-preparations
#5
Anna W Sobańska, Jarosław Pyzowski, Elżbieta Brzezińska
Selected synthetic food dyes (tartrazine, Ponceau 4R, Brilliant Blue, orange yellow, and azorubine) were isolated from liquid preparations (mouthwashes and beverages) by Solid Phase Extraction on aminopropyl-bonded silica with diluted aqueous sodium hydroxide as an eluent. The extraction step was followed by thin layer chromatography on silica gel 60 with chloroform-isopropanol-25% aq. ammonia 1 : 3 : 1 (v/v/v) as mobile phase and the densitometric quantification of dyes was achieved using quadratic calibration plots (R(2) > 0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28796185/performance-of-electropun-polyacrylonitrile-nanofibrous-phases-shown-for-the-separation-of-water-soluble-food-dyes-via-utlc-vis-esi-ms
#6
Pimolpun Niamlang, Pitt Supaphol, Gertrud E Morlock
Research in the miniaturization of planar chromatography led to various approaches in manufacturing ultrathin-layer chromatography (UTLC) layers of reduced thickness (<50 µm) along with smaller instrumentation, as targeted in Office Chromatography. This novel concept merges 3D print & media technologies with miniaturized planar chromatography to realize an all-in-one instrument, in which all steps of UTLC are automated and integrated in the same tiny device. In this context, the development of electrospun polyacrylonitrile (PAN) nanofiber phases was investigated as well as its performance...
August 10, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28793756/pharmacokinetics-of-rhodamine-110-and-its-organ-distribution-in-rats
#7
Shiau-Han Jiang, Yung-Yi Cheng, Teh-Ia Huo, Tung-Hu Tsai
Rhodamine dyes have been banned as food additives due to their potential tumorigenicity. Rhodamine 110 is illegal as a food additive, although its pharmacokinetics have not been characterized, and no accurate bioanalytical methods are available to quantify rhodamine 110. The aim of this study was to develop and validate a fast, stable, sensitive method to quantify rhodamine 110 using high-performance liquid chromatography coupled to tandem mass spectrometry (HPLC-MS/MS) to assess its pharmacokinetics and organ distribution in awake rats...
August 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28753273/on-chip-photothermal-analyte-detection-using-integrated-luminescent-temperature-sensors
#8
Simon Anton Pfeiffer, Stefan Nagl
Optical absorbance detection based on attenuated light transmission is limited in sensitivity due to short path lengths in microfluidic and other miniaturized platforms. An alternative is detection using the photothermal effect. Herein we introduce a new kind of photothermal absorbance measurement using integrated luminescent temperature sensor spots inside microfluidic channels. The temperature sensors were photopolymerized inside the channels from NOA 81 UV-curable thiolene prepolymer doped with tris(1,10-phenanthroline)ruthenium(II) temperature probe...
July 28, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28748579/new-approach-applying-a-pet-fish-air-pump-in-liquid-phase-microextraction-for-the-determination-of-sudan-dyes-in-food-samples-by-hplc
#9
Phitchan Sricharoen, Nunticha Limchoowong, Suchila Techawongstien, Saksit Chanthai
A new approach applying a pet fish air pump is introduced to develop an extraction method, namely, air-pump-enhanced emulsion, followed by salt-assisted emulsion breaking based on solidified floating organic drop microextraction for the extraction and preconcentration of Sudan I-IV before high-performance liquid chromatography. The applicability of this method was successfully demonstrated by the determination of these dyes in four chili products that include chili powder, chili oil, chili sauce and chili paste...
July 27, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28745439/a-double-stimuli-responsive-fluorescent-center-for-monitoring-of-food-spoilage-based-on-dye-covalently-modified-eumofs-from-sensory-hydrogels-to-logic-devices
#10
Xiao-Yu Xu, Xiao Lian, Ji-Na Hao, Chi Zhang, Bing Yan
Unsafe food is a huge threat to human health and the economy, and detecting food spoilage early is an ongoing and imperative need. Herein, a simple and effective strategy combining a fluorescence sensor and one-to-two logic operation is designed for monitoring biogenic amines, indicators of food spoilage. Sensors (methyl red@lanthanide metal-organic frameworks (MR@EuMOFs)) are created by covalently modifying MR into NH2 -rich EuMOFs, which have a high quantum yield (48%). A double-stimuli-responsive fluorescence center is produced via energy transfer from the ligands to Eu(3+) and MR...
July 26, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28741107/development-and-optimization-of-a-novel-sample-preparation-method-cored-on-functionalized-nanofibers-mat-solid-phase-extraction-for-the-simultaneous-efficient-extraction-of-illegal-anionic-and-cationic-dyes-in-foods
#11
Feifei Qi, Ningge Jian, Liangliang Qian, Weixin Cao, Qian Xu, Jian Li
A simple and efficient three-step sample preparation method was developed and optimized for the simultaneous analysis of illegal anionic and cationic dyes (acid orange 7, metanil yellow, auramine-O, and chrysoidine) in food samples. A novel solid-phase extraction (SPE) procedure based on nanofibers mat (NFsM) was proposed after solvent extraction and freeze-salting out purification. The preferred SPE sorbent was selected from five functionalized NFsMs by orthogonal experimental design, and the optimization of SPE parameters was achieved through response surface methodology (RSM) based on the Box-Behnken design (BBD)...
July 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28731314/desensitization-to-chemical-and-food-sensitivities-by-low-dose-immunotherapy-ascertained-by-provocation-neutralization-is-associated-with-reduced-influx-of-calcium-ions-into-lymphocytes
#12
Basant K Puri, John McLaren Howard, Jean A Monro
Background Food and chemical sensitivities have detrimental effects on health and the quality of life. The natural course of such sensitivities can potentially be altered through various types of allergen-specific immunotherapy, including low-dose immunotherapy. The molecular mechanism by which low-dose immunotherapy causes desensitization has not thus far been elucidated. While resting lymphocytes maintain a low cytosolic calcium ion concentration, antigen receptor signaling results in calcium ion influx, predominantly via store-operated calcium channels...
April 26, 2017: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/28727917/a-3d-printed-portable-optical-sensing-platform-for-smartphones-capable-of-detecting-the-herbicide-2-4-dichlorophenoxyacetic-acid
#13
Yijia Wang, Mohamed Maarouf Ali Zeinhom, Mingming Yang, Rongrong Sun, Shengfu Wang, Jordan N Smith, Charles Timchalk, Lei Li, Yuehe Lin, Dan Du
Onsite rapid detection of herbicide and herbicide residuals in environmental and biological specimens is important for agriculture, environment, food safety, and health care. Traditional method for herbicide detection requires expensive laboratory equipment and a long turn-round time. In this work, we developed a single-stripe microliter plate smartphone colorimetric device for rapid and low-cost in-field test. This portable smartphone platform is capable of screening 8 samples in a microplate single-stripe...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28722538/dispersed-synthesis-of-uniform-fe3o4-magnetic-nanoparticles-via-in-situ-decomposition-of-iron-precursor-along-cotton-fiber-for-sudan-dyes-analysis-in-food-samples
#14
Yassine Bentahir, Said Elmarhoum, Rachid Salghi, Manuel Algarra, Angel Ríos, Mohammed Zougagh
Fe3O4 magnetic nanoparticles, with a negative charge surface, are known to have efficient adsorbent properties, but they tend to be agglomerated into larger aggregates or flocs, which can cause loss of specific area. The addition of cotton fiber, as a stabilizer in preparation of the Fe3O4 nanoparticles, is able to efficiently reduce particle aggregation, and thus, effective particle size, resulting in much greater specific surface area and adsorption sites. Fe3O4 nanoparticles synthesis was accomplished by in-situ high temperature decomposition of the precursor ferric ion in the presence of cotton fiber and ethylene glycol solvent...
July 19, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28721668/quantitative-analysis-of-s-mutans-lactobacillus-and-bifidobacterium-found-in-initial-and-mature-plaques-in-thai-children-with-early-childhood-caries
#15
K Mitrakul, S Chanvitan, A Jeamset, K Vongsawan
AIMS: To quantify Streptococcus mutans, lactobacillus and bifidobacterium in initial and mature plaque collected from children with severe early childhood caries (S-ECC) and caries-free (CF) groups and to analyse the association between these bacteria and caries-related factors in each group. STUDY DESIGN: A collection of 120 initial and overnight supra-gingival plaques were collected from Thai children aged 2-5 years-old (S-ECC = 60, CF = 60). Plaque, gingival indices and decayed, missing, filled tooth (dmft) scores were recorded...
July 18, 2017: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28721410/an-intrinsic-internal-standard-substrate-of-au-ps-b-p4vp-for-rapid-quantification-by-surface-enhanced-raman-scattering
#16
Jiamin Gao, Cheng Zhao, Zhuomin Zhang, Gongke Li
Reliable quantification by surface enhanced Raman scattering (SERS) highly depends on the development of a reproducible substrate with excellent anti-interference capability. In this work, an intrinsic internal standard (IS) SERS substrate based on a diblock copolymer, polystyrene-block-poly-4-vinylpyridine (PS-b-P4VP), as a template was developed by a modified block copolymer lithography (BCL) technique of reserving the diblock copolymer template. This substrate generated a stable vibration peak at 1066 cm(-1) attributed to poly(4-vinylpyridine) (P4VP) which could be used as an intrinsic IS for precise SERS quantification...
August 7, 2017: Analyst
https://www.readbyqxmd.com/read/28719022/engineering-the-surface-of-smart-nanocarriers-using-a-ph-thermal-gsh-responsive-polymer-zipper-for-precise-tumor-targeting-therapy-in-vivo
#17
Penghui Zhang, Yan Wang, Jing Lian, Qi Shen, Chen Wang, Bohan Ma, Yuchao Zhang, Tingting Xu, Jianxin Li, Yongping Shao, Feng Xu, Jun-Jie Zhu
Nanocarrier surface chemistry plays a vital role in mediating cell internalization and enhancing delivery efficiency during in vivo chemotherapy. Inspired by the ability of proteins to alter their conformation to mediate functions, a pH-/thermal-/glutathione-responsive polymer zipper consisting of cell-penetrating poly(disulfide)s and thermosensitive polymers bearing guanidinium/phosphate (Gu(+) /pY(-) ) motifs to spatiotemporally tune the surface composition of nanocarriers for precise tumor targeting and efficient drug delivery is developed...
July 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28690307/analyses-of-acidic-tar-dyes-in-high-protein-foods-and-examination-of-extraction-and-clean-up-methods-for-various-foods
#18
Asa Osuga, Yoko Uematsu, Yukiko Yamajima, Takushi Fujiwara, Shoichi Tahara, Hiroyuki Miyakawa, Kimio Monma
Extraction and clean-up methods were examined for the analysis of acidic tar dyes in various high-protein foods. 1% Aqueous ammonia followed by ethanol, 1% aqueous ammonia-ethanol (1 : 1) mixture, and 1% aqueous ammonia-tetrahydrofuran (1 : 1) mixture were used in sequence for boiled fish paste (kamaboko), pounded fish cake (hanpen), and sausage. The sausage extract was centrifuged at low temperature to solidify and remove the contained fat. Salted cod roe with red pepper was extracted twice with 1% aqueous ammonia-ethanol (1 : 1) mixture, followed by extraction with 1% aqueous ammonia-tetrahydrofuran (1 : 1) mixture...
2017: Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
https://www.readbyqxmd.com/read/28684672/color-stability-of-new-esthetic-restorative-materials-a-spectrophotometric-analysis
#19
Claudio Poggio, Lodovico Vialba, Anna Berardengo, Ricaldone Federico, Marco Colombo, Riccardo Beltrami, Andrea Scribante
The aim of this in vitro study was to evaluate and compare the color stability of different esthetic restorative materials (one microfilled composite, one nanofilled composite, one nanoceramic composite, one microfilled hybrid composite, one microfilled hybrid composite, one nanohybrid Ormocer based composite and one supra-nano spherical hybrid composite) after exposure to different staining solutions (physiological saline, red wine, coffee). All materials were prepared and polymerized into silicon rings (2 mm × 6 mm × 8 mm) to obtain specimens identical in size...
July 6, 2017: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/28674282/spiroketalcarminic-acid-a-novel-minor-anthraquinone-pigment-in-cochineal-extract-used-in-food-additives
#20
Yusai Ito, Naoki Harikai, Kyoko Ishizuki, Kazufusa Shinomiya, Naoki Sugimoto, Hiroshi Akiyama
Cochineal extract prepared from the scale insect Dactylopus coccus (American cochineal) has been used as a natural red dye for food, cosmetics, and pharmaceuticals. The major pigment in cochineal extract is carminic acid (CA), an anthraquinone glucoside, and several minor pigments have been previously reported. Our investigation aimed at establishing the safety of cochineal dye products using UPLC-PDA-ESI-TOF/MS found an unknown minor pigment, spiroketalcarminic acid (1), in three commercial cochineal extract samples; cochineal extract used in food additives, carmine that is an aluminum salt of cochineal extract used as natural dye, and a research reagent of CA...
July 1, 2017: Chemical & Pharmaceutical Bulletin
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