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Food dye

Meike Koester, René Gergs
Analyzing food webs is essential for a better understanding of ecosystems. For example, food web interactions can undergo severe changes caused by the invasion of non-indigenous species. However, an exact identification of field predator-prey interactions is difficult in many cases. These analyses are often based on a visual evaluation of gut content or the analysis of stable isotope ratios (δ(15)N and δ(13)C). Such methods require comprehensive knowledge about, respectively, morphologic diversity or isotopic signature from individual prey organisms, leading to obstacles in the exact identification of prey organisms...
October 5, 2017: Journal of Visualized Experiments: JoVE
Nail Altunay, Adil Elik, Ramazan Gürkan
Acrylamide (AAm) is a carcinogenic chemical that can form in thermally processed foods by the Maillard reaction of glucose with asparagine. AAm can easily be formed especially in frequently consumed chips and cereal-based foods depending on processing conditions. Considering these properties of AAm, a new, simple and green method is proposed for the extraction of AAm from thermally processed food samples. In this study, an ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate, [Bmim][BF4]) as extractant was used in the presence of a cationic phenazine group dye, 3,7-diamino-5-phenylphenazinium chloride (PSH(+), phenosafranine) at pH 7...
October 20, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
A Smeriglio, M Denaro, D Barreca, V D'Angelo, M P Germanò, D Trombetta
Black carrot (Daucus carota L. ssp. sativus var. atrorubens Alef.) is a valuable source of carbohydrates, minerals and vitamins and contains also high amounts of anthocyanins giving the characteristic deep-purple color. These latter compounds are known as natural dyes used in the food and pharmaceutical industry that have recently attracted much attention for their healthful properties. The aim of this work was to investigate for the first time the polyphenolic profile and biological properties of a black carrot crude extract (BCCE) through an in-depth analysis of the main polyphenolic classes evaluating its antioxidant, cytoprotective and anti-angiogenic properties...
October 16, 2017: Fitoterapia
Lingyu Han, I Ratcliffe, P A Williams
A series of inulin derivatives were synthesized in aqueous solution using acyl chlorides with varying alkyl chain length (C10-C16). They were characterised using a number of techniques including MALDI TOF-MS, (1)H NMR and FTIR and their degree of substitution determined. The solution properties of the hydrophobically modified inulins were investigated using dye solubilisation and surface tension and it was confirmed that the molecules aggregated in solution above a critical concentration (critical aggregation concentration, CAC)...
December 15, 2017: Carbohydrate Polymers
Subramanyam Deepika, Rajendran Harishkumar, Murugesan Dinesh, Rajadurai Abarna, Moorthy Anbalagan, Selvaraj Mohana Roopan, Chinnadurai Immanuel Selvaraj
The purpose of our work is to identify the bioactive compounds of bark and leaves extract from Ailanthus excelsa Roxb. and to explore its effectiveness against synthetic food dye. The presence of primary and secondary metabolites was confirmed by carrying out phytochemicals analysis. With the prior knowledge accessible on the indispensable secondary metabolites holding antioxidant and cytotoxicity activity, the quantitative screening of total phenolic and flavonoid content in methanolic and aqueous extract of bark and leaves from Ailanthus excelsa were done...
October 12, 2017: Journal of Photochemistry and Photobiology. B, Biology
Joshua K G Karlsson, Owen J Woodford, Roza A S Al-Aqar, Anthony Harriman
Erythrosine, a popular food dye, undergoes fast O2-sensitive bleaching in water when subjected to visible light illumi-nation. In dilute solution, Erythrosine undergoes photo-bleaching via first-order kinetics, where the rate of bleaching depends critically on the rate of photon absorption and on the concentration of dissolved oxygen. Kinetic studies indi-cate that this inherent bleaching is augmented by self-catalysis at higher concentrations of Erythrosine and on long exposure times. Under the conditions used, bleaching occurs by way of geminate attack of singlet molecular oxygen on the chromophore...
October 19, 2017: Journal of Physical Chemistry. A
Grant E Haines, S Laurie Sanderson
Ram suspension-feeding fishes swim with an open mouth to force water through the oral cavity and extract prey items that are too small to be pursued individually. Recent research has indicated that, rather than using a dead-end mechanical sieve, American paddlefish (Polyodon spathula Walbaum) employ vortical cross-step filtration. In this filtration mechanism, vortical flow that is generated posterior to the branchial arches organizes crossflow filtration processes into a spatial structure across the gill rakers...
October 16, 2017: Journal of Experimental Biology
Ersin Kılınç, Kadir Serdar Çelik, Havin Bilgetekin
Hybrid nanostructures composed of γ-Fe2O3 (maghemite) and carboxylated-multi walled carbon nanotube (cMWCNT) were used for the magnetic solid phase extractions and determination of Sudan I, II, III, IV, Para Red, Sudan Black B and Sudan Red 7B in chili products. High performance liquid chromatography (HPLC) was employed for the measurements. Limit of quantification (LOQ) values were found in the range 0.44-2.82ngmL(-1) for analytes. The best extraction parameters were determined as pH 8.0, 40mg of magnetic nanoparticle, 4...
March 1, 2018: Food Chemistry
James E Simon, Eric A Decker, Mario G Ferruzzi, M Monica Giusti, Carla D Mejia, Mark Goldschmidt, Stephen T Talcott
Color additives are applied to many food, drug, and cosmetic products. With up to 85% of consumer buying decisions potentially influenced by color, appropriate application of color additives and their safety is critical. Color additives are defined by the U.S. Federal Food, Drug, and Cosmetic Act (FD&C Act) as any dye, pigment, or substance that can impart color to a food, drug, or cosmetic or to the human body. Under current U.S. Food and Drug Administration (FDA) regulations, colors fall into 2 categories as those subject to an FDA certification process and those that are exempt from certification often referred to as "natural" colors by consumers because they are sourced from plants, minerals, and animals...
October 14, 2017: Journal of Food Science
Shalini Muniandy, Ignatius Julian Dinshaw, Swe Jyan Teh, Chin Wei Lai, Fatimah Ibrahim, Kwai Lin Thong, Bey Fen Leo
Reduced graphene oxide (rGO) has emerged as a promising nanomaterial for reliable detection of pathogenic bacteria due to its exceptional properties such as ultrahigh electron transfer ability, large surface to volume ratio, biocompatibility, and its unique interactions with DNA bases of the aptamer. In this study, rGO-azophloxine (AP) nanocomposite aptasensor was developed for a sensitive, rapid, and robust detection of foodborne pathogens. Besides providing an excellent conductive and soluble rGO nanocomposite, the AP dye also acts as an electroactive indicator for redox reactions...
October 13, 2017: Analytical and Bioanalytical Chemistry
Nasser Abdulatif Al-Shabib, Javed Masood Khan, Mohammad A Alsenaidy, Abdulrahman M Alsenaidy, Mohd Shahnawaz Khan, Fohad Mabood Husain, Mohammad Rashid Khan, Mohammad Naseem, Priyankar Sen, Parvez Alam, Rizwan Hasan Khan
Amyloid fibrils are playing key role in the pathogenesis of various neurodegenerative diseases. Generally anionic molecules are known to induce amyloid fibril in several proteins. In this work, we have studied the effect of anionic food additive dye i.e., tartrazine (TZ) on the amyloid fibril formation of human serum albumins (HSA) and bovine serum albumin (BSA) at pHs7.4 and 3.5. We have employed various biophysical methods like, turbidity measurements, Rayleigh Light Scattering (RLS), Dynamic Light Scattering (DLS), intrinsic fluorescence, Congo red assay, far-UV CD, transmission electron microscopy (TEM) and atomic force microscopy (AFM) to decipher the mechanism of TZ-induce amyloid fibril formation in both the serum albumins at pHs7...
September 22, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Anchal Ghai, Dolonchampa Maji, Michael Rettig, Chantiya Chanswangphuwana, John DiPersio, Walter Akers, Samuel Achilefu, Farrokh Dehdashti, Ravi Vij, Monica Shokeen
Multiple myeloma (MM) is a plasma B-cell hematologic cancer that causes significant skeletal morbidity. Despite improvements in survival, heterogeneity in response remains a major challenge in MM. Cluster of differentiation 38 (CD38) is a type II transmembrane glycoprotein over-expressed in myeloma cells and is implicated in MM cell signaling. Daratumumab is US Food and Drug Administration approved high-affinity monoclonal antibody targeting CD38 that is clinically benefiting refractory MM patients. Here, we evaluated [(89)Zr]Zr-DFO-daratumumab positron emission tomography/computed tomography (PET/CT) imaging in MM tumor models...
October 12, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Nasser Abdulatif Al-Shabib, Javed Masood Khan, Ajamaluddin Malik, Abdulrahman M Alsenaidy, Mohammad A Alsenaidy, Fohad Mabood Husain, Monis Bilal Shamsi, Syed Hidayathulla, Rizwan Hasan Khan
Recent studies have led to an increased interest to categorize small molecular inhibitors of protein fibrillation. In this study, we used spectroscopy, microscopy and gel electrophoresis techniques that provides an elaborated description of the Allura Red-induced amyloid fibrillation in the β-LG protein at two pHs (7.4 and 3.5). The spectroscopy results show that β-LG protein form aggregates in the presence of Allura Red (0.04 to 15.0mM) at pH 3.5 due to electrostatic and hydrophobic interactions. However, at pH 7...
October 8, 2017: International Journal of Biological Macromolecules
Qianqian Sun, Liu Yang, Jidong Yang, Shaopu Liu, Xiaoli Hu
Allura red (AR) is a common food additive. It is of significance to detect AR sensitively and selectively in soft drinks. In this report, fluorescence spectra of allura red-rhodamine dyes systems were studied. In a pH 6.0 Britton-Robinson buffer medium, the fluorescence of rhodamine dyes, such as rhodamine B (RB), butylrhodamine B (BRB) and rhodamine 6G (R6G), can be quenched by AR. Impressively, the emission spectrums of the RB and BRB change slightly upon the addition of AR, but it was clear that the emission of R6G decreased dramatically in the presence of AR...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Bing Yan
Metal-organic frameworks (MOFs) possess an important advantage over other candidate classes for chemosensory materials because of their exceptional structural tunability and properties. Luminescent sensing using MOFs is a simple, intuitive, and convenient method to recognize species, but the method has limitations, such as insufficient chemical selectivity and signal loss. MOFs contain versatile building blocks (linkers or ligands) with special chemical reactivity, and postsynthetic modification (PSM) provides an opportunity to exploit and expand their unique properties...
October 6, 2017: Accounts of Chemical Research
Dong-Yang Chen, Hao Zhang, Jia-Li Feng, Dong Zeng, Li Ding, Xian-Jun Liu, Bang-Rui Li
An efficient method was developed for the simultaneous determination of 10 industrial dyes (basic orange 2, basic orange 21, basic orange 22, acid orange II, auramine, basic rhodamine B and Sudan I-IV) in the foodstuffs using high-performance liquid chromatography coupled with diode array detector. Samples were extracted with acetonitrile and cleaned up on a solid phase extraction cartridge using HLB. The chromatographic separation was achieved on a C18 column using a mobile phase consisting of methanol and 10 mmol/L ammonium acetate with 0...
August 31, 2017: Journal of Chromatographic Science
Hock Eng Khoo, Azrina Azlan, Sou Teng Tang, See Meng Lim
Anthocyanins are colored water-soluble pigments belonging to the phenolic group. The pigments are in glycosylated forms. Anthocyanins responsible for the colors, red, purple, and blue, are in fruits and vegetables. Berries, currants, grapes, and some tropical fruits have high anthocyanins content. Red to purplish blue-colored leafy vegetables, grains, roots, and tubers are the edible vegetables that contain a high level of anthocyanins. Among the anthocyanin pigments, cyanidin-3-glucoside is the major anthocyanin found in most of the plants...
2017: Food & Nutrition Research
Haizhu Zhou, Wei Guo, Bo Xu, Zhanwei Teng, Dapeng Tao, Yujie Lou, Yunhang Gao
Lignin, a common natural polymers, is abundant and complex, and termites can break down and utilize the lignin in their food. In this study an attempt was made to isolate and characterize the lignolytic bacteria from termite (Reticulitermes chinensis Snyder) gut. Two strains (PY12 and MX5) with high lignin peroxidase (LiP) activity were screened using the azure B method. By analyzing their 16S rRNA, the strain PY12 was classified as Enterobacter hormaechei; MX5, as Bacillus licheniformis. We then optimized the different conditions of liquid fermentation medium, and obtained LiP activities of 278 U/L and 256 U/L for PY12 and MX5, respectively...
September 21, 2017: Microbial Pathogenesis
Khaled Elbanna, Osama Mohamed Sarhan, Manal Khider, Mohamed Elmogy, Hussein Hasan Abulreesh, Mohamed Rabie Shaaban
In this study, 120 lactic acid bacterial strains from different fermented dairy products as well as 10 bacterial intestinal isolates were evaluated for in vitro and in vivo degradation of various food azo dyes. Of these isolates, lactic acid bacteria (LAB) strains 13 and 100 and the intestinal isolates Ent2 and Eco5 exhibited 96-98% degradation of the tested food azo dyes within 5-6 hours. High performance liquid chromatography mass spectra of sunset yellow (E110) and carmoisine (E122) anaerobic degradation products by the intestinal isolates showed that they were structurally related to toxic aromatic amines...
July 2017: Journal of Food and Drug Analysis
Wenping Xiao, Shiming Li, Siyu Wang, Chi-Tang Ho
Gardenia jasminoides, grown in multiple regions in China, was commonly used as a natural yellow dye but has been one of the popular traditional Chinese medicines since the discovery of its biological property a few decades ago. It has been reported that G. jasminoides possess multiple biological activities, such as antioxidant properties, hypoglycemic effect, inhibition of inflammation, antidepression activity, and improved sleeping quality. In this review, our aim was to have a comprehensive summary of its phytochemistry including the extraction, isolation, and characterization of volatiles and bioactive molecules in G...
January 2017: Journal of Food and Drug Analysis
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