共查询到20条相似文献，搜索用时 15 毫秒
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.
The influences of a series of new azo direct dyes including copper-complexes based on benzidine congeners, 2,2′-dimethyl-5,5′-dipropoxybenzidine
and 5,5′-dipropoxybenzidine, were examined using microorganism, Daphnia magna. The purpose of the research described in this
paper was to use bioassays with daphnids to determine the aquatic toxicity of new azo dyes in which copper was incorporated.
The results clearly show that copper has negative effects to aquatic ecosystem as expected. The study also suggested that
the assay with Daphnia magna was an excellent method to evaluate the influences of dyes to the aquatic environment. 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.
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
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.
Cardador-Martínez A Albores A Bah M Calderón-Salinas V Castaño-Tostado E Guevara-González R Shimada-Miyasaka A Loarca-Piña G 《Plant foods for human nutrition (Dordrecht, Netherlands)》2006,61(4):161-168
Common beans are rich in phenolic compounds, which can provide health benefits to the consumer. The objective of this work was to study the relationship among antimutagenicity, antioxidant and enzymatic activities of methanolic extract and trolox by principal components multivariate analysis. Antimutagenicity of phenolic compounds present in methanolic extract from the seed coat of common beans (P. vulgaris, Flor de Mayo Bajío cultivar) and trolox against AFB1 mutagenicity were evaluated in the Salmonella typhimurium microsuspension assay. Antioxidant capacity of methanolic extract and trolox were evaluated using β-carotene and 1,1-diphenyl-2-picryhydrazyl (DPPH) in vitro model assays. Cythrome P450 activity was measured by fluorometric assay. For phenolic extract, trolox and phenolic extract + trolox, the inhibition on AFB1 mutagenicity in tester strain TA100 was 47, 59 and 69%, respectively. While in TA98 was 39, 48 and 68%. The inhibition of phenolic compounds, trolox and phenolic compounds + trolox on cytochrome P450 (CYP450) activity was 48, 59 and 88%, respectively. Correlation analysis showed that phenolic extract and trolox have high antimutagenic and antioxidant activity and also inhibited enzymatic activity. The results suggest that the primary mechanism of action of phenolic compounds in beans against AFB1 mutagenicity may be extra-cellular in the microsuspension assay. 相似文献
7.
The dyeability of poly(lactic acid) [PLA] with a range of commercial disperse dye was examined and compared to that of poly(ethylene
terephthalate) [PET] in addition to the colour and fastness of the resultant dyeings. A screening exercise in which twenty
dyes of differing energy types and chemical classes were applied to PLA revealed a substantial variation between the dyes
in terms of dye uptake (12–88 % at 4 %o.w.f.). Nine dyes exhausted above 70 % and were selected for further study, which involved
comparison of shade and fastness of PLA dyeings with those of the corresponding PET dyeings. Differences in shade depended
on hue while wet fastness of each of the PLA dyeings was either the same or 0.5–1.0 point lower than its PET counterpart.
In all but one case, dye photostability in PLA was found to be very similar to that in PET. Dye build-up profiles on PLA were
also investigated and from these results mixtures of compatible dyes identified. 相似文献
8.
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
9.
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
10.
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
11.
Wilson-Sanchez G Moreno-Félix C Velazquez C Plascencia-Jatomea M Acosta A Machi-Lara L Aldana-Madrid ML Ezquerra-Brauer JM Robles-Zepeda R Burgos-Hernandez A 《Marine drugs》2010,8(11):2795-2809
An organic extract from fresh shrimp (Litopenaeus vannamei) was studied for antimutagenic and antiproliferative properties using Salmonella typhimurium tester strains TA98 and TA100 with metabolic activation (S9) and a cancer cell line (B-cell lymphoma), respectively. Shrimp extract was sequentially fractionated by thin layer chromatography (TLC) and each fraction was tested for antimutagenic and antiproliferative activities. Crude organic extracts obtained from shrimp reduced the number of revertants caused by aflatoxina B(1), showing a dose-response type of relationship. Sequential TLC fractionation of the active extracts produced several antimutagenic and/or antiproliferative fractions. These results suggested that the lipid fraction of the tested species contained compounds with chemoprotective properties that reduce the mutagenicity of AFB(1) and proliferation of a cancer cell line. 相似文献
12.
Dyebath used for metal complex dyeing of nylon microfiber was recycled to reduce the overall amounts of metal complex dyeing
effluents. Instead of discharging the dyebath after each dyeing cycle, the residual dyebath was analyzed spectrophotometrically
and reconstituted to the required concentration of dyes and auxiliaries. Dyebaths were reused eight times and the CIELAB coordinates
of dyed samples were measured after each recycling. Color difference (ΔE*) between the sample dyed in the fresh bath and that
from reused dyebath was maintained below 1.5. The levelness and fastness of dyed fabrics from recycled dyebath were not impaired
either. Chromium content of each recycled dyebath was similar to that of the first residual dyebath. 相似文献
13.
Martínez-Rocha A Puga R Hernández-Sandoval L Loarca-Piña G Mendoza S 《Plant foods for human nutrition (Dordrecht, Netherlands)》2008,63(1):1-5
Free essential oil methanolic extracts from three different geographical populations of Lippia graveolens in México were screened for antioxidant and antimutagenic properties by the DPPH and Kado microsuspension assay, respectively.
Total phenolic and flavonoid contents as well as HPLC identification and quantification of naringenin and rosmarinic acid
were also carried out. In addition, a taxonomical phenetic analysis was performed. The L. graveolens extracts showed varying content of phenols and flavonoids. Significant concentration of rosmarinic acid was found for the
first time in the species. All the extracts were capable of scavenging DPPH radicals in a concentration dependent fashion;
the IC50 values correlate with the phenolic content. None of the extracts was toxic to TA100 and TA98 strains at the concentrations
tested; moreover, the extracts at a concentration equivalent to 200 μg of gallic acid inhibited a 39 and 30% the mutagenicity
induced by 4-nitro-o-phenylenediamine and sodium azide, respectively. The results suggest that the Mexican oregano is a source of polar bioactive
ingredients for the food industry. 相似文献
14.
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
15.
This paper presents the synthesis of metal complex acid dyes obtained from the reaction of o,o′-dihydroxyazo dyes and chromium and cobalt sulfate. The 1H-NMR, FT-IR and UV/Visible Spectrophotometer, TLC (Thin Layer Chromatography) and ICP (Ion Chromatography) of the intermediates
and the metal complexes were studied and compared. Their properties such as dyeing, fastness and toxicity on nylon were also
assessed according to standard methods. 相似文献
16.
A.A. Aver’yanov V.P. LapikovaT.D. Pasechnik T.S. ZakharenkovaS.I. Pogosyan C.J. Baker 《Crop Protection》2011,30(7):925-930
The goal of this study was to test the ability of the photodynamic dyes bengal rose, toluidine blue and methylene blue to protect systemically cucumber plants from cucurbit scab. At the stage of one true leaf, water or aqueous solutions of the dyes were applied to the leaf as droplets. When the second leaf appeared and was fully developed, it was inoculated with a spore suspension of Cladosporium cucumerinum. It was found that all dyes (at 0.5-200 μM) significantly suppressed symptoms of the disease. The effect was preceded by development of local damage of the treated leaf. The degree of the damage as well as the disease suppression increased with dye concentration. Both indices were smaller if the plants were kept in darkness for the first day after the treatment. It is suggested that reactive oxygen photogenerated by dyes caused a local cell death, which induced resistance in distant leaves. The dyes tested, or their derivatives, may offer a base for novel disease resistance inducers. 相似文献
17.
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
18.
Six nano disperse dyes were prepared using corresponding O/W nanoemulsions which were obtained with sodium laurylsulphate
and caprylic triglyceride. The average particle size of the dyes prepared were in the range of 110–130 nm. Exhaust dyeing
using nano dyes resulted in low exhaustion yields of 17–26 % on regular polyester fiber and 28–38 % on ultramicrofiber polyester.
The observed low exhaustion yields of nano disperse dye can be explained by the solubilization of dye particles into surfactant
micelles as well as the high stability of the nanoemulsions, these might reduce the capacity of dye uptake onto the fibers.
However, higher K/S values of dyeings with nano dyes on ultramicrofiber sites compared to those on regular polyester sites
suggested their potential to be more efficient dyes for finer denier microfiber polyesters. 相似文献
19.
Maqbool Hussain Khalid Mohammed Khan Syed Ishrat Ali Rasheeda Parveen Woo Sub Shim 《Fibers and Polymers》2009,10(4):407-412
The fluorescence properties of textiles dyed with optical brighteners have been widely reported in literature. However, little
sufficient study has investigated the UV protection properties of textiles dyed with fluorescent whitening agents (FWAs).
This study reports the synthesis of a series of stilbene-triazine compounds and their performance on cotton fiber as UV absorbing
and FWAs. Triazinyldiaminostilbene compounds were synthesized by reacting 4,4′-diaminostilbene-2,2′-disulfonic acid with 2,4,6-trichloro-1,3,5-triazine
to give 4,4′-bis(4,6-dichloro-1,3,5-triazin-2-yl)aminostilbene-2,2′-disulphonic acid. This intermediate was further condensed
in two steps with amines by nucleophilic substituents on their triazine moiety. The structure of synthesized compounds were
characterized by spectroscopic techniques i.e. IR, UV, elemental analysis and conformed by proton NMR Spectroscopy. These
compounds were applied to cotton fiber as fluorescent whitening and UV absorbing agents. Their performances were evaluated
with regards to whitening effects, ultraviolet protection factor (UPF), degree of exhaustion and fastness test. 相似文献
20.
Potato virus Y (PVY) isolates from potato were divided into two major groups – I and II – on the basis of nucleotide sequence variability
at the 5′-UTR of the virus genome. In this paper, a consensus sequence for each group was compiled by examining PVY isolates
of potato. The consensus sequences of the two groups differed from each other by as much as 31% of nucleotide sequence divergence.
However, sequences of most individual members within each group (except for one, the 605 strain) were conserved and varied
by less than 1% in group II and up to 6% in group I. These results confirm that the two virus groups are markedly distinct
but that the 5′-UTR sequence of individual members within each group is highly conserved. These findings imply that the 5′-UTR
can be reliably applied for major grouping of isolates but that its use for discrimination among individual isolates within
each group is limited. Isolates of both group I and II included members of the O/N-NTN virus types. Classification of PVY
isolates in potato is discussed. 相似文献