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1.
A series of new metallized direct dyes based on benzidine congeners, 2,2′-dimethyl-5,5′-dipropoxybenzidine and 5,5′-dipropoxybenzidine,
were evaluated for mutagenicity in Salmonella typhimurium strains TA98 and TA100. All of the dyes examined were judged to
be non-mutagenic with and without metabolic activation while toxicity was seen in some dyes at high doses. The study also
suggested that the standard Salmonella mutagenicity plate-incorporated assay was an excellent method for evaluation of dyes
for mutagenicity. 相似文献
2.
A series of new direct dyes based on benzidine congeners, 2,2′-dimethyl-5,5′-dipropoxybenzidine and 5,5′-dipropoxybenzidine,
were evaluated for mutagenicity in Salmonella typhimurium strains TA98 and TA100. All of the dyes examined were judged to
be non-mutagenic with and without metabolic activation while toxicity was seen in some dyes at high doses. The study also
suggested that the standard Salmonella mutagenicity plate-incorporated assay was an excellent method for evaluation of direct
dyes for mutagenicity. 相似文献
3.
Non-genotoxic diamines 2,2′-dimethyl-5,5′-dipropoxybenzidine and 5,5′-dipropoxy-benzidine were employed as potential alternatives to benzidine in the synthesis and evaluation of new direct dyes for cotton. Assessment of the resultant dyes indicated that both diamines can be used to prepare new direct dyes having colors and fastness properties that make them comparable to commercial direct dyes, and that the structures of the new direct dyes can be confirmed by negative ion electrospray mass spectrometry (ESMS). The mutagenic properties of new direct dyes were established using the standard Ames Salmonella mammalian mutagenicity assay. 相似文献
4.
The nonionic surfactant properties of ethoxylated azo dyes, such as cloud point and surface tension have been investigated.
The synthesized ethoxylated azo dyes could dye polyester fabric without any special pre-treatment. When the average number
of ethylene oxide (EO) in the ethoxylated azo dye reached 6, its fixation could exceed 90% from the thermosol dyeing process.
The average degree of condensation of ethylene glycol in the chain was interrelated with the dyeing results and did not affect
on the maximum absorption wavelength (λmax) of the polyoxyethylene dye. When the average length of polyoxyethylene chain decreased,
the molecular weight of dyes became smaller and the fixation of dyes was improved. 相似文献
5.
Dyeing properties of a series of 4-amino-4′-fluorosulfonylazobenzene disperse dyes on poly(ethylene terephthalate) (PET) were
investigated. Build-up properties and color properties on PET were examined. In particular, the 4-aminoazobenzene dyes containing
a nitro group instead of a fluorosulfonyl group at 4′-position were also synthesized in order to compare their dyeing properties
on PET with that of 4′-fluorosulfonyl analogues. 相似文献
6.
Seven hot brand heterocyclic mono azo reactive dyes (7a–g) have been synthesized by coupling diazotized 2-phenyl-3{4′-[(4″-aminophenyl)sulphonyl]phenyl}-quinazoline-4(3H)-one-6-sulphonic
acid (4) with various 2-chloro-4-nitro anilino cyanurated coupling components (6a–g) and their dyeing performance on silk, wool, and cotton has been assessed. The purity of dyes was checked by thin layer chromatography.
These dyes were identified by recording IR and 1H-NMR spectra. The λ
max, R
f
value, %exhaustion, %fixation, light fastness, wash fastness, rubbing fastness, reflectance (%R) value, and K/S value have also been studied. 相似文献
7.
Dispersant-free PTT dyeing of temporarily solubilized azo disperse dyes based on pyridone moiety which contain β-sulfatoethylsulfonyl
group was investigated. The dyes were successfully applied to PTT without the use of dispersants. The color yields of the
dyes on PTT fabric were dependent on dyeing pH as well as dyeing temperature. The optimum results were obtained at pH 5–6
and 110 °C. The dyes showed alkali-clearing property and exhibited good to excellent fastness on the PTT fabric. The COD levels
of the dyeing effluent from the temporarily solubilized disperse dyes were much smaller than those from commercial disperse
dye. 相似文献
8.
Saminathan Ratnapandian Stanley MacArthur Fergusson Lijing Wang 《Fibers and Polymers》2012,13(2):206-211
Coloration of textiles, traditionally achieved using natural dyes, commonly employs synthetic dyes at the industrial level.
A revival of commercial interest in natural dyes has opened several research avenues. This paper investigates the application
by padding of cotton fabric with 10 g/l of two natural dyes derived from the Acacia plant family. Three mordanting techniques were studied; of which post-mordanting
produced the most even shade. Among the two mordants investigated, the use of copper sulfate resulted in a level beige shade
at 15 g/l concentration while ferrous sulfate performed best at 5 g/l yielding a yellow-grey shade. An optimum process-sequence for the copper sulfate mordant was “pad (dye)→dry→steam followed
by pad (mordant)→steam→dry”, and for ferrous sulfte it was “pad (dye)→steam→dry followed by pad (mordant)→steam→dry”. Typically
a change in mordant resulted in a different shade with the same dye. The study concluded that padding is a readily adaptable
process for the dyeing of cotton using natural dyes and acceptable fastness in shades can be obtained. 相似文献
9.
The acid doping behavior of poly(2,2′-(m-phenylene)-5,5′-bibenzimidazole) (PBI) membranes in aqueous phosphoric acid was studied at room temperature. It was found
that doping phosphoric acid in the membrane obeyed a multimolecular layer absorption mechanism proposed in this work. Equation,
i.e., 1/[L
T
]
B
=(1 − C
0/17.5)/2.1, was presented to describe the relationship of the acid doping level of membranes and the concentration of the
doping acid in a range of 2–14 mol L−1. The acid doping kinetics as well as the influence of the doped acids on the conductivity and mechanical strength of the
PBI membranes was investigated. 相似文献
10.
Omar HH 《Pakistan journal of biological sciences: PJBS》2008,11(10):1310-1316
This study is to inspect how the variation of molecular structures and functional groups present in our models, monoazo dye (Tartrazine) and diazo dye (Ponceau), affects decolorization capabilities of green algae, cyanobacteria and diatoms. The results revealed that the removal of azo dyes was rapid at the initial period of study (3 days) and became slowly with the time (6 days). The maximum decolorization was observed at 5 ppm Tartrazine with S. bijugatus (68%) and N. muscourm after 6 days incubation. The reduction of color removal appears to be related to the molecular structure of the dyes and species of algae used. The culture of the diatom Nitzschia perminuta was completely died after 2 days of incubation. Azo reductase of algae, which is responsible for degradation of azo dyes into aromatic amine by breaking the azo linkage, was estimated. IR spectra represented a new peak at 3300 cm(-1) and a reduction in the azo band at 1642-1631 cm(-1). In order to investigate the sorption behavior of algae, Langmuir equilibrium model was tested. 相似文献
11.
Poly(lactic acid) (PLA) is known for environmentally friendly material as it is derived from annually renewable crops and biodegradable. Dispersant-free dyeing of PLA fabric with three temporarily solubilized azo disperse dyes which contain β-sulfatoethylsulfonyl group was investigated and their dyeing and fastness properties were compared with those of commercial disperse dyes. The temporarily solubilized azo disperse dyes were successfully applied to PLA fabric without the use of dispersant. The color yield on PLA fabric was dependent on dyebath pH and dyeing temperature as well. The optimum results were obtained at pH 7-8 and 110 °C. The dyes showed markedly higher color yield on PLA fabric when compared to commercial disperse dyes. Wash fastness was very poor to poor but light fastness was good. The COD levels of the dyeing effluent from the temporarily solubilized disperse dyes were considerably lower than those from commercial disperse dyes. 相似文献
12.
Heterocyclic monoazo quinazolinone based azo dyes derived by the diazotization of 3-(4-aminophenyl)-2-phenylquinazolin-4(3H)-one
with various phenyl pyrazolones based coupling components. All the heterocyclic azo dyes have been characterized by their
percentage yield, UV-VIS spectroscopy, elemental analysis, IR spectroscopy, 1H NMR spectroscopy, and dyeing performance on silk, wool, nylon, and polyester fibers. All the dyes gave moderate to excellent
fastness properties on each fiber. The main focus was to synthesize heterocyclic monoazo dyes that give good dyeing property
along with pharmacological activity (anti bacterial and antifungal). Therefore, the synthesized compounds were examined for
their antimicrobial activity at various concentrations using well-known Kirby-Bauer disk diffusion method. 相似文献
13.
A. Dewanji S. Chanda L. Si S. Barik S. Matai 《Plant foods for human nutrition (Dordrecht, Netherlands)》1997,50(4):349-357
In a study conducted on the extraction of protein from the leaves of 30 freshwater aquatic plants, the highest standing crop
fresh yield was found inTypha latifolia (2650g/m2). The Bio-Medical Data Processing (BMDP)K-means clustering program withK=2 showed that 11 of the 30 plants had a high protein nitrogen extractability as well as a high nitrogen content of the extracted
protein. Among these, leaf protein fromAllmania nodiflora had the highest content of crude protein (62.7%) and β-carotene (782.4 μg/g). Leaf protein prepared fromHygrophila spinosa, Ottelia alismoides andPolygonum barbatum had low in-vitro digestibility. The levels of alkaloids and polyphenols were lower in the extracted protein compared to that
present in the original leaf sample. 相似文献
14.
Copper (II) salts are used as metallizing agents in the synthesis of new non-genotoxic direct dyes for cotton. Specifically,
cotton fabric is dyed with non-genotoxic disazo direct dyes and then treated with copper salts. The complexes are characterized
by neutron activation analysis, absorption spectrometry and standard Salmonella mammalian mutagenicity assay, and the after-treated
fabrics are evaluated for lightfastness and washfastness. Direct dyes possessingortho-propoxy andortho’-hydroxy substituted systems formed the corresponding nonmutagenic 1:2 dye:metal complex and undergo significant improvement
in lightfastness following metallization. 相似文献
15.
Azo disperse dyes (D1-D13) were prepared by various diazotized aryl amines coupled with N-(phenyl)-2-[(4-phenyl-1,3-thiazol-2-yl)amino] acetamide. All the azo disperse dyes have been characterized by their percentage yield, UV-VIS spectroscopy, elemental analysis, IR spectroscopy, 1H-NMR spectroscopy, and dyeing performance on polyester fiber. These dyes were applied to polyester fabric by HTHP method and their fastness properties were evaluated. All the dyes gave moderate to excellent fastness properties on polyester fiber. The main focus was to synthesize azo disperse dyes that give good dyeing property along with pharmacological activity. Therefore, the synthesized compounds were examined for their antimicrobial activity at various concentrations using well-known Kirby-Bauer disk diffusion method. 相似文献
16.
The synthesis of a series of phthalimide based azo disperse dyes and their spectral properties were investigated. The azo
dyes containing phthalimide and N-methyl phthalimide structure in diazo component were synthesized in order to compare their spectral properties. The synthesized
dyes developed the color of yellow to violet and the N-substitution of the phthalimide gave a bathochromic effect on the color change. Most of the synthesized dyes exhibit negative
solvatochromism so that the absorption band of dyes moves toward shorter wavelengths as the polarity of the solvent increases.
In the case of halochromic effect, the bathochromic shift decreased steadily with the general electron donating capacity of
the substituents in the coupling component, and became negative especially when more powerful electron donating groups are
present in the coupling components ring. 相似文献
17.
A series of some novel hybrid materials prepared via a sol-gel process have been synthesized from methyltrimethoxysilane and titanium n-butoxide with heterocyclic thiazole azo dyes. Silica/titania/thiazole azo dyes hybrid materials were synthesized via a sol-gel process with a precursor system. Alternatively, the heterocyclic thiazole azo dyes were catalytically processed by means of hydrolysis-condensation reactions with appropriate amounts of a mixture of vinyltriethoxysilane, methyltrimethoxysilane, and titanium n-butoxide at a fixed molar ratio. The structure of these hybrid silica/titania/thiazole dye materials was characterized by Fourier transform infrared (FT-IR) analysis. The surface morphology of processed PET/PA6 nonwoven fabrics was evaluated by scanning electron microscopy (SEM). SEM images showed uniform dyeing, thereby confirming the reaction of the hybrid materials with the PET/PA6 nonwoven fabrics. The water contact angle, washing fastness, color evenness, air permeability, and weatherability characteristics of the as-prepared dyed PET/PA6 nonwoven fabrics were subsequently evaluated. Results revealed improved weatherability and good water repellency. Further, it was also revealed that dyeing and finishing could be achieved in a single bath, which is advantageous to reduce processing costs. 相似文献
18.
Vanessa Pasquet Nemeshwaree Behary Anne Perwuelz Jalal Isaad 《Fibers and Polymers》2013,14(7):1141-1147
Development of water-soluble dyes for the dyeing of different textile fabrics is essential for the textile industry due to ecological and economical reasons. In this study, a series of new azoic dyes were prepared by diazotization reaction between the phenyl boronic acid and different aniline derivatives, and their dyeing capacity in aqueous solution was evaluated. The synthesized boronic azo dyes present good water solubility and can dye polyamide (nylon), wool, silk, and cellulose acetate fabrics. The effect of factors such as concentration of dye, dyeing temperature, and pH on the level of color strength (K/S) was studied. The dyeing results showed that higher color strength K/S (about 16) and fastness properties (about 4/5) with boronic acid dyes were achieved at higher temperatures avoiding the use of surface agents, mordants, and other polluting chemical additives. 相似文献
19.
Taekyeong Kim Jongsuc Jung Kyungjin Jang Seokhan Yoon Mikyung Kim 《Fibers and Polymers》2009,10(2):148-153
A series of new monoazo yellow dyes having different alkyl substituents was synthesized to dye unmodified polypropylene fiber.
Color hue of the dyes exhibited light yellow with very high chroma enough to use as yellow primary color dyes. The affinity
of the dyes onto unmodified polypropylene was increased with the increase of the length of alkyl substituents. Therefore,
the hexyl-substituted dye having the longest alkyl group in this experiment showed very high color strength of dyeings with
K/S value of over 26 at maximum absorption wavelength. The color fastnesses to washing, rubbing and light were also improved
significantly for the longer alkyl substituted dyes, so that the hexyl-substituted dye exhibited a rating higher than 4∼5
for all kinds of fastnesses. 相似文献
20.
Stipcevic T Piljac J Vanden Berghe D 《Plant foods for human nutrition (Dordrecht, Netherlands)》2006,61(1):27-32
In this study, we discovered that flavonoids belonging to the subclasses: (flavanone, flavone, and flavonol) display differential effects on the synthesis of collagen in human dermal fibroblasts. At 80 μg/ml flavonoids quercetin-3,3′,4′, 5,7-pentahydroxyflavone, 3-methyl quercetin, and 7-hydroxyflavone significantly decreased the total protein concentration which was a direct consequence of their cytotoxic effect, while naringenin exhibited no effect on total collagen and total protein concentration. Quercetin-3,3′4′,7-tetramethyl ether, 4′-hydroxyflavanone, flavanone, and fisetin significantly decreased collagen concentration while morin, rutin, and chrysin increased collagen concentration without changing the overall protein concentration. The initial screening performed in this study enables the identification of compounds that exert significant effects on fibroblast function and show potential as starting material for pharmaceutical preparations targeted against various disorders centered around disturbed collagen metabolism. 相似文献