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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
#1
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
#2
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
#3
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...
July 19, 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
#4
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
#5
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
#6
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
#7
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
https://www.readbyqxmd.com/read/28650022/interaction-and-inhibitory-influence-of-the-azo-dye-carmoisine-on-lysozyme-amyloid-fibrillogenesis
#8
Anirban Basu, Gopinatha Suresh Kumar
The binding of the common food colorant carmoisine and its inhibitory effect on amyloid fibrillation in lysozyme have been investigated. Since humans are increasingly exposed to various food colorants like carmoisine, such studies are highly relevant. In the presence of lysozyme, the carmoisine absorption spectrum exhibited hypochromic changes. The intrinsic fluorescence of lysozyme was also quenched on interaction. Time-resolved fluorescence results suggested that the binding mechanism involved ground state complexation...
June 26, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28649706/improving-efficiency-of-viability-qpcr-for-selective-detection-of-infectious-hav-in-food-and-water-samples
#9
W Randazzo, Joaquín Piqueras, Jesús Rodríguez-Díaz, R Aznar, G Sánchez
AIM: To improve the efficacy of intercalating dyes to distinguishing between infectious and inactivated hepatitis A virus (HAV) in food. METHODS AND RESULTS: Different intercalating dyes were evaluated for the discrimination between infectious and thermally-inactivated HAV suspensions combining with the RT-qPCR proposed in the ISO 15216. Among them, PMAxx was the best dye in removing the RT-qPCR signal from inactivated HAV. Applied to lettuce and spinach, PMAxx-Triton pretreatment resulted in complete removal of the RT-qPCR signal from inactivated HAV...
June 26, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28648623/isolation-of-anticancer-and-antimicrobial-metabolites-from-epicoccum-nigrum-endophyte-of-ferula-sumbul
#10
Irum Perveen, Muhammad Asam Raza, Tahir Iqbal, Iffat Naz, Shama Sehar, Safia Ahmed
Owing to the importance of endophytes, current research was aimed to purify the secondary metabolites from targeted source. Ferula sumbul, a lipophilic extract of the endophyte was prepared in 10% methanol and partitioned with ethyl acetate and bioassay guided isolation was carried using standard protocols against bacterial, fungal and cancer cells. The active fractions consisted of three new metabolites (2-methyl-3-nonyl prodiginine, Bis (2-ethylhexyl) phthalate, and a meroterpenoid, Preaustinoid A). Their structures were confirmed with LCMS/MS...
June 23, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28648259/semisynthesis-and-spectral-characterization-of-5-methylpyranopelargonidin-and-4-methylfuropelargonidin-and-their-separation-and-detection-in-strawberry-fruit-wine
#11
Ondřej Kurka, Lukáš Kučera, Helena Pelantová, Marek Kuzma, Vladimír Havlíček, Petr Bednář
Condensation of anthocyanins and their aglycons with small organic molecules yields more stable natural dyes, e.g. pyranoanthocyanins arising spontaneously in various food products. Reaction of pelargonidin with acetone produces two isomeric anthocyanidin dyes - 5-methylpyranopelargonidin and 4-methylfuropelargonidin. A robust semipreparative liquid chromatographic method was developed to isolate both derivatives from a simple aged solution of pelargonidin in methanol: acetone: 37% aqueous hydrochloric acid (1:1:0...
August 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28642926/the-combined-effect-of-food-simulating-solutions-brushing-and-staining-on-color-stability-of-composite-resins
#12
Tânia Mara Da Silva, Ana Luísa Leme Simões Sales, Cesar Rogerio Pucci, Alessandra Bühler Borges, Carlos Rocha Gomes Torres
Objective: This study evaluated the effect of food-simulating media associated with brushing and coffee staining on color stability of different composite resins. Materials and methods: Eighty specimens were prepared for each composite: Grandio SO (Voco), Amaris (Voco), Filtek Z350XT (3M/ESPE), Filtek P90 (3M/ESPE). They were divided into four groups according to food-simulating media for 7 days: artificial saliva (control), heptane, citric acid and ethanol. The composite surface was submitted to 10,950 brushing cycles (200 g load) in an automatic toothbrushing machine...
January 2017: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642918/color-stability-of-esthetic-restorative-materials-a-spectrophotometric-analysis
#13
Claudio Poggio, Matteo Ceci, Riccardo Beltrami, Maria Mirando, Jaffal Wassim, Marco Colombo
Objective: The aim of this in vitro study was to evaluate the color stability of different restorative materials (one microfilled composite, one nanofilled composite, one nanohybrid composite and one Ormocer-based composite) after exposure to different staining solutions (coffee, coca-cola and red wine). Material and methods: All materials were polymerized into silicon rings (2 mm ×6 mm ×8 mm) to obtain specimens identical in size. Thirty cylindrical specimens of each material were prepared. They were immersed in staining solutions over a 28-day test period...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28635650/the-application-of-heptamethine-cyanine-dye-dz-1-and-indocyanine-green-for-imaging-and-targeting-in-xenograft-models-of-hepatocellular-carcinoma
#14
Caiqin Zhang, Yong Zhao, He Zhang, Xue Chen, Ningning Zhao, Dengxu Tan, Hai Zhang, Changhong Shi
Near infrared fluorescence (NIRF) imaging has strong potential for widespread use in noninvasive tumor imaging. Indocyanine green (ICG) is the only Food and Drug Administration (FDA) -approved NIRF dye for clinical diagnosis; however, it is unstable and poorly targets tumors. DZ-1 is a novel heptamethine cyanine NIRF dye, suitable for imaging and tumor targeting. Here, we compared the fluorescence intensity and metabolism of DZ-1 and ICG. Additionally, we assayed their specificities and abilities to target tumor cells, using cultured hepatocellular carcinoma (HCC) cell lines, a nude mouse subcutaneous xenograft model of liver cancer, and a rabbit orthotopic transplantation model...
June 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28602300/development-of-on-line-spectrofluorimetric-methodology-for-selenium-monitoring-in-foods-and-biological-fluids-using-chrome-azurol-s-quenching
#15
Débora G Santarossa, Liliana P Fernández
A novel, simple and accurate on-line green methodology for Se(IV) monitoring by molecular fluorescence has been developed. Because the analyte does not exhibit fluorescence, the organic dye Chrome azurol S (CAS) has been chosen to allow detection. The effect of metal-quenching on CAS excitation and emission conditions (λex=300nm; λem=407nm) was used as criterion for analyte quantification in presence of sodium cholate bile salt (NaC). The quenching mechanism was explored, and it can be classified as a collisional type with a Stern-Volmer constant value of 3...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28602192/mediated-electrochemical-method-for-the-determination-of-indigo-carmine-levels-in-food-products
#16
Majid Arvand, Mehrnoosh Saberi, Masoomeh Sayyar Ardaki, Asadollah Mohammadi
In this paper, we have studied the electrochemical behavior of indigo carmine (IC) in the presence and absence of mediator molecules. We have used three azo dyes as mediators in our studies and the effect of mediator molecules on the electron transfer between the IC solution and the electrode surface was explained from the cyclic voltammograms data. Among these dyes, 4-(4-nitrophenilazo)N-benzyl,N-ethylaniline (NBE) showed good performance as an electron transfer mediator. The NBE/carbon paste was characterized with Fourier transform infrared spectroscopy and scanning electron microscopy methods...
October 1, 2017: Talanta
https://www.readbyqxmd.com/read/28601037/enterococcus-species-for-the-one-pot-biofabrication-of-gold-nanoparticles-characterization-and-nanobiotechnological-applications
#17
Iyabo Christianah Oladipo, Agbaje Lateef, Joseph Adetunji Elegbede, Musibau Adewuyi Azeez, Tesleem Babatunde Asafa, Taofeek Akangbe Yekeen, Akeem Akinboro, Evariste Bosco Gueguim-Kana, Lorika Selomi Beukes, Tolulope Oluyomi Oluyide, Oluwatoyin Rebecca Atanda
In the current work, cell-free extracts of four strains of non-pathogenic Enterococcus species of food origin, were studied for the green synthesis of gold nanoparticles (AuNPs), and characterized by UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The AuNPs were evaluated for their Anopheles gambiae larvicidal, dye degradation, antioxidant and thrombolytic activities. The blue-black colloidal AuNPs which absorbed maximally at 549-552nm were nearly spherical in shape, and crystalline in nature with size of 8-50nm...
June 3, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28600852/extraction-methods-and-food-uses-of-a-natural-red-colorant-from-dye-sorghum
#18
Fug Akogou, App Kayodé, Hmw den Besten, A R Linnemann
BACKGROUND: The interest in stable natural colorants for food applications continues to grow. A red pigment extracted from the leaf sheaths of a sorghum variety (Sorghum bicolor) with a high content of apigeninidin is widely used as a biocolorant in processed foods in West-Africa. This study compared the colour and the anthocyanin composition from traditional extraction methods to determine options for improvement and use of the red biocolorant from dye sorghum in the food sector. RESULTS: Sorghum biocolorant was commonly applied in fermented and heated foods...
June 10, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28597218/uncovering-a-new-moral-dilemma-of-economic-optimization-in-biotechnological-processing
#19
Marek Vochozka, Vojtěch Stehel, Anna Maroušková
The trend of emerging biorefineries is to process the harvest as efficiently as possible and without any waste. From the most valuable phytomass, refined medicines, enzymes, dyes and other special reactants are created. Functional foods, food ingredients, oils, alcohol, solvents, plastics, fillers and a wide variety of other chemical products follow. After being treated with nutrient recovery techniques (for fertilizer production), biofuels or soil improvers are produced from the leftovers. Economic optimization algorithms have confirmed that such complex biorefineries can be financially viable only when a high degree of feedstock concentration is included...
June 8, 2017: Science and Engineering Ethics
https://www.readbyqxmd.com/read/28589774/development-of-a-multiplex-qpcr-in-real-time-for-quantification-and-differential-diagnosis-of-salmonella-gallinarum-and-salmonella-pullorum
#20
Marcela da Silva Rubio, Rafael Antonio Casarin Penha Filho, Adriana Maria de Almeida, Angelo Berchieri Junior
Currently there are 2659 Salmonella serovars. The host-specific biovars Salmonella Pullorum and Salmonella Gallinarum, cause systemic infections in food-producing and wild birds. Fast diagnosis is crucial to control the dissemination in avian environments. The present work describes the development of a multiplex qPCR in real time using a low cost DNA dye (SYBr Green) to identify and quantify these biovars. Primers were chosen based on genomic regions of difference (RoD) and optimized to control dimers. Primers pSGP differentiate from other serovars and pSG and pSP differentiate biovars...
June 7, 2017: Avian Pathology: Journal of the W.V.P.A
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