Dyes Extraction
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. EXTRAÇÃO DE CORANTES TÊXTEIS UTILIZANDO SISTEMAS AQUOSOS BIFÁSICOS COMPOSTOS POR 2-PROPANOL E SAIS DE SULFATO
Aqueous Two Phase Systems (ATPS) composed of 2-propanol + inorganic salt (Na2SO4/MgSO4) + water, at different temperatures T = (20, 30, 40 and 50) °C were applied in the partition studies of the textile dyes Yellow, Blue Royal and Red Dianix CC. The thermodynamic parameters of the free transfer energy (∆Gtr), enthalpy (∆Htr) and entropy (∆Str), respec
Química Nova. Publicado em: 2022
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2. Validation of an UHPLC-MS/MS Method for the Determination of Malachite Green, Leucomalachite Green, Crystal Violet, and Leucocrystal Violet in Shrimp, Fish, and Salmon Muscle Using a Modified QuEChERS Approach
A quantitative and confirmatory method for detecting the presence of triphenylmethane dyes in shrimp muscle using ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) and a quick, easy, cheap, effective, rugged and safe (QuEChERS) extraction approach was validated. The method exhibited linearity and selectivity and the coeffici
J. Braz. Chem. Soc.. Publicado em: 2021-04
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3. Recombination Study of Dye Sensitized Solar Cells with Natural Extracts
Natural dyes can be used in dye sensitized solar cells (DSSCs) to generate low-cost devices, although with low light harvesting because of energy losses from the recombination process. This study investigates recombination reactions in DSSCs with natural dyes extracted from eggplants, plums, and hibiscus flowers. Titanium dioxide films were coated on a fluor
J. Braz. Chem. Soc.. Publicado em: 2019-02
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4. Magnetic Solid-Phase Extraction Combined with Dispersive Liquid-Liquid Microextraction Followed by HPLC for Determination of Four Aromatic Amines Released from Azo Dyes in Paper Samples
A novel extraction technique combining dispersive liquid-liquid microextraction (DLLME) with magnetic solid-phase extraction (MSPE) is presented for pre-concentration of four primary aromatic amines (PAAs) released from azo dyes in paper samples prior to high performance liquid chromatography (HPLC). n-Octanol was used as the extractant and hydrophobic oleic
J. Braz. Chem. Soc.. Publicado em: 2018-04
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5. Determination of Six Synthetic Dyes in Sports Drinks by Dispersive Solid-Phase Extraction and HPLC-UV-Vis
A simple, fast and efficient method was developed for determination of six synthetic dyes (Tartrazine, Sunset Yellow, Amaranth, Ponceau 4R, Indigo Carmine and Brilliant Blue) in sports drinks using dispersive solid-phase extraction (d-SPE) with the polymeric sorbent Oasis® HLB. Sample preparation using d-SPE permitted to simplify the procedure and use less
J. Braz. Chem. Soc.. Publicado em: 2018-03
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6. Celdas solares sensibilizadas con colorantes fotosensibles obtenidos de plantas de la región sur de ecuador
Four vegetal species of the southern of Ecuador were used as sensitizers for making dye-sensitized solar cells (DSSCs). The effect of type and amount of material, type and time of maceration were tested in order to determine the best conditions of extraction. The extraction of the natural dye was made with acidified ethanol. The sensitizing agents were adsor
Quím. Nova. Publicado em: 2017-04
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7. Application of a Novel Micro-Cloud Point Extraction for Preconcentration and Spectrophotometric Determination of Azo Dyes
A novel room temperature micro-cloud point extraction procedure using triton X-114 surfactant as extracting phase was developed for preconcentration and extraction of three azo dyes (orange G, methyl orange, and acid red 18) from aqueous samples using molecular absorption spectrophotometry in the visible region. The effects of different parameters such as co
J. Braz. Chem. Soc.. Publicado em: 2016-09
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8. Catostylus tagi: partial rDNA sequencing and characterisation of nematocyte structures using two improvements in jellyfish sample preparation
AbstractBackground More than 200 Scyphozoa species have been described, but few have been properly studied regarding their chemical and genetic characteristics.Catostylus tagi, an edible Scyphozoa and the sole European Catostylidae, occurs in summer at Tagus and Sado estuaries. Neither a systematic comparison between the two Catostyluscommunities nor a chemi
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 10/11/2015
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9. Extraction of Indigo from Some Isatis species and Dyeing Standardization Using Low-technology Methods
Fresh leaves of four Isatis species culture form of I. tinctoria L and wild forms of I. buschiana Schischkin, I. candolleana Boiss. (endemic) and I. tinctoria L. subsp. corymbosa. (Boiss.) were used for indigo production. Dyes were extracted by fermentation and hot water application. The extracted dyes were optimized with different pH and reducing agents. Re
Braz. arch. biol. technol.. Publicado em: 2015-02
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10. Utilização de quitina e mordente na remoção do corante preto Remazol B por adsorção / Use of chitin and mordant in the removal of Remazol black B dye by adsorption
In this work was investigate the physical-chemical treatment for the removal Remazol Black B dye reagent by adsorption using chitin isolated from industrial waste (exoskeleton shrimp). The extraction of chitin was made from industrial waste of shrimp (exoskeleton of shrimp) in the decolorization treatment with NaClO, followed by deproteinization of alkali so
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2012
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11. Antocianinas extraídas de capim-gordura (Melinis minutiflora): atividade antioxidante, microencapsulamento por atomização e estabilidade / Anthocyanin extracted of Molassesgrass (Melinis minutiflora): antioxidant activity, micro-encapsulation by atomization and stability
As antocianinas são pigmentos bastante instáveis, presente em vegetais como uva, amora, morango, jabuticaba, repolho roxo e outros. Apesar de existirem varias fontes, poucos vegetais se apresentam como fonte comercial, sendo assim, a busca de novas fontes, que apresentem um baixo custo, bem como formas de estabilizar este pigmento tem estimulado o desenvol
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/07/2011
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12. Spectrophotometric determination of famotidine using sulphonphthalein dyes
Four new extraction-free spectrophotometric methods have been established for the quantitation of famotidine (FMT). The methods are based on the formation of yellow ion-pair complexes between FMT and four sulphonphthalein dyes viz., bromothymol blue (method A), bromophenol blue (method B), bromocresol purple (method C) and bromocresol green (method D) in dio
Química Nova. Publicado em: 2011