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1.
Andrzej Piasecki Beata Wójcik Jacek Łuczyński Dorota Piłakowska-Pietras Stanisław Witek Anna Krasowska 《Journal of surfactants and detergents》2009,12(3):201-207
A homologous series of new surface-active 1,1-bis{[3-(N,N-dimethylamino)ethyl]-amido}alkane-di-N-oxides were synthesized in the reaction of an appropriate diethyl 2-alkylmalonate with N,N-dimethylethylenediamine followed by oxidation with an aqueous solution of hydrogen peroxide. The adsorption isotherms of
their aqueous solutions were measured and evaluated to obtain adsorption parameters: critical micelle concentration (CMC),
surface excess concentration (ΓCMC), equilibrium surface tension at the CMC (γ
CMC), cross-sectional area of the adsorbed surfactant molecule (A
CMC), standard free energies of adsorption and micellization
相似文献
Anna Krasowska (Corresponding author)Email: |
2.
Sławomir Karczewski Andrzej Piasecki Irena Maliszewska 《Journal of surfactants and detergents》2008,11(3):201-205
A new group of surface active dicephalic derivatives of 1,3-dioxane, i.e., 2-alkyl-5,5-bis{[3-(N,N-dimethylamino)propyl]amido}-1,3-dioxane-di-N-oxides, were synthesized with high yields by the reaction of an appropriate 2-alkyl-5,5-bis-(carboxyethyl)-1,3-dioxane with
an excess of N,N-dimethyl-1,3-propanediamine followed by oxidation with an aqueous solution of hydrogen peroxide. Structures and purity of
all intermediates and final di-N-oxides were confirmed by means of 1H-NMR and ESI-MS spectroscopy. Synthesized compounds showed high surface activity with low values of critical micelle concentration
and high effectiveness of surface tension reduction (γ
CMC). However, only derivative with the longest 2-alkyl substituent showed good foaming and moderate emulsifying properties.
相似文献
Andrzej PiaseckiEmail: |
3.
Marcelo C. Murguía Laura M. Machuca María C. Lurá María I. Cabrera Ricardo J. Grau 《Journal of surfactants and detergents》2008,11(3):223-230
A series of new N-acetylated non-ionic and cationic gemini surfactants (3a–f) having dimeric structures derived from primary and tertiary amines with variably long tails (C8–C12–C18) were synthesized. In addition, N-acetylated monomeric analogues 6a and 6b were prepared and their antifungal potency and surface properties were also determined. Critical micelle concentration (CMC),
effectiveness of surface tension reduction (γCMC), surface excess concentration (Γ), and area per molecule at the interface (A) were also determined and the resulting values indicate that the cationic series is characterized by good surface-active
and self-aggregation properties. For the first time, all surfactants were tested to evaluate their antifungal properties using
the method for the broth macrodilution test (M27-A2, NCCLS). Four microbial strains were used to perform the study: Candida parapsilosis (ATCC 22019), C. albicans (ATCC 64548), and a wild-type strain of C. parasilosis and Saccharomyces cerevisiae (ATCC 9763). The antimicrobial activity was measured by yeast growth inhibition expressed as minimum inhibitory concentration
(MIC) values. Results were compared to those obtained for their monomeric analogues and for a commercially available reference
compound (Fluconazole). Gemini 3b, 3e and 3f were found to be the most potent compounds. The results show S. cerevisiae as the most sensitive strain. In contrast, the wild strain of C. parapsilosis was resistant.
相似文献
Ricardo J. Grau (Corresponding author)Email: |
4.
Andrzej Piasecki Dorota Piłakowska-Pietras Anna Baran Anna Krasowska 《Journal of surfactants and detergents》2008,11(3):187-194
A homologous series of surface active 2-(alkanoylamino)ethyldimethylamine-N-oxides, EDA-p(O), and 3-(alkanoylamino)propyldimethylamine-N-oxides, PDA-p(O), were synthesized. Their aqueous stock solutions were processed by the automatically operating apparatus to remove surface-active
contamination and provide chemical purity at the air/water interface. In case of 3-(tetradecanoylamino)propyldimethylamine-N-oxide, PDA-14(O), the difference between equilibrium surface tension values of the purified surfactant solutions and the corresponding values
of the solutions prepared from the “as received” compounds amounts to 15 mN m−1. Moreover, in presence of the surface-active contaminants time needed to reach equilibrium surface tension values is over
2 h. For the solution of the “surface-chemically pure” grade the change of the surface tension within adsorption time is negligible
and the equilibrium is reached instantaneously. Physicochemical properties of obtained surface-chemically pure aqueous solutions
of N-oxides of alkylamidoamines and adsorption parameters (standard free energy of adsorption, ΔG°ads, surface excess by saturation surface concentration, Γ∞, minimum surface area demand per molecule adsorbed, A
min) were evaluated from the equilibrium surface tension versus concentration isotherms at the air/water interface using Gibbs’s
equation. The introduction of the CH2 moiety into the intermediate part of molecule causes a slight decrease of the hydrophobic character of surfactant. Also the
minimum surface area demand, A
min, is slightly greater for PDA series than for the corresponding EDA derivatives. Surface potential measurements were performed in addition to surface tension studies. Electric surface potential
versus concentration isotherms was determined. Surface potential increases with increasing surfactant’s bulk concentration
for all investigated compounds. At highest concentrations, where interface is almost saturated, changes of surface potential
become almost negligible.
相似文献
Andrzej PiaseckiEmail: |
5.
A cDNA encoding the Arabidopsis extraplastidic linoleate desaturase (FAD3) was overexpressed in the seeds of wild-type Arabidopsis and in a mutant line that accumulates high levels of oleic acid. In the transformed wild-type plants, linolenic acid (18:3Δ9,12,15)
increased from 19% to nearly 40% of total seed fatty acids, with a corresponding decrease in linoleate content (18:2Δ9,12).
In the high oleate mutant, a large increase in the level of a fatty acid identified by gas-chromatography/mass-spectrometry
as mangiferic acid (18:2Δ9,15) was observed. The results demonstrate that the polymethylene-interrupted dienoic fatty acid,
mangiferic acid, can be produced in seed oil through the overexpression of a fatty acid n-3 desaturase.
相似文献
Mark A. SmithEmail: |
6.
L. I. N. Ezemonye D. F. Ogeleka F. E. Okieimen 《Journal of surfactants and detergents》2007,10(4):301-308
The assessment of water and sediment quality from chemical pollutants in the Nigerian Niger Delta were conducted using bioindicators
(Desmoscaris tripsinosa and Palaemonetes africanus). The Organization for Economic Cooperation and Development (OECD) (2004), No.218 direct sediment toxicity assessment was
employed. Shrimp were exposed to sediments treated with Neatex (liquid detergent) and Norust CR 486 (corrosion inhibitor)
at concentrations of 31.25, 62.5, 125, 250 and 500 mg/kg. Percentage mortality was measured as the ecological endpoint. Mean
% mortality and estimated lethal concentration LC50 values varied with species type, concentration and exposure duration.
Observed % mean mortality of the test organisms in both chemicals were significantly different from that of the control test
suggesting that mortality may be induced by the effect of the chemicals. LC50s were significantly different for both chemicals
at p < 0.05, t = 6.06 (fresh water) and p < 0.05, t = 12.34 (brackish). The values from this study are an indication that the chemicals have the potential to cause acute lethal
toxicity. It is a prediction of likely adverse effects on shrimp populations in benthic sediment of the Niger Delta ecological
zone. Consequently, there is a great need to protect some of the more sensitive invertebrates representing the major proportion
of the diet of many other species.
相似文献
F. E. OkieimenEmail: |
7.
Preparation,Surface-Active Properties and Antimicrobial Activities of Bis(Ester Quaternary Ammonium) Salts 总被引:3,自引:0,他引:3
Joanna Węgrzyńska Jan Chlebicki Irena Maliszewska 《Journal of surfactants and detergents》2007,10(2):109-116
New cationic surfactants, bis-quaternary ammonium salts, were prepared from N,N-dimethylaminoalkyl esters of saturated fatty acids and products of the reactions of epichlorohydrin with primary amines:
pentyl-, hexyl- and octylamine. The bis (ester–ammonium) salts obtained were examined in respect to their surface-active properties:
critical micelle concentration (CMC), effectiveness of surface tension reduction (γCMC), and adsorption efficiency (pC20). All these surfactants showed good water solubility and low critical micelle concentrations of more than two orders of magnitude
lower than these of corresponding mono-alkylammonium salts. They also showed good wetting capability, but worse foaming properties.
All the surfactants tested were nontoxic to gram-negative bacteria, but some of them inhibited the growth of gram-positive
bacteria and yeast.
相似文献
Jan ChlebickiEmail: |
8.
Ashot Khrimian Matthew S. Siderhurst Grant T. Mcquate Nicanor J. Liquido Janice Nagata Lori Carvalho Filadelfo Guzman Eric B. Jang 《Journal of chemical ecology》2009,35(2):209-218
Oriental fruit fly, Bactrocera dorsalis (Hendel), males are highly attracted to the natural phenylpropanoid methyl eugenol (ME). They compulsively feed on ME and
metabolize it to ring and side-chain hydroxylated compounds that have both pheromonal and allomonal functions. Side-chain
metabolic activation of ME leading to (E)-coniferyl alcohol has long been recognized as a primary reason for hepatocarcinogenicity of this compound in rodents. Earlier,
we demonstrated that introduction of a fluorine atom at the terminal carbon of the ME side chain significantly depressed metabolism
and specifically reduced formation of coniferyl alcohol but had little effect on field attractiveness to B. dorsalis. In the current paper, we demonstrate that fluorination of ME at the 4 position of the aromatic ring blocks metabolic ring-hydroxylation
but overall enhances side-chain metabolism by increasing production of fluorinated (E)-coniferyl alcohol. In laboratory experiments, oriental fruit fly males were attracted to and readily consumed 1,2-dimethoxy-4-fluoro-5-(2-propenyl)benzene
(I) at rates similar to ME but metabolized it faster. Flies that consumed the fluorine analog were as healthy post feeding
as ones fed on methyl eugenol. In field trials, the fluorine analog I was ∼50% less attractive to male B. dorsalis than ME.
相似文献
Ashot KhrimianEmail: |
9.
Shouwen Jin Wanzhi Chen Daqi Wang 《Journal of Inorganic and Organometallic Polymers and Materials》2007,17(4):583-588
[Co2(L1)2(NCS)4]·4MeOH 1, [Co(L2)2(H2O)2](Sal)2·4H2O (Sal = salicylate) 2 were obtained from self-assembly of the cobalt salts with bis(N-benzimidazolyl)methane (L1), and bis(N-benzimidazolyl)methane (L2), and their structures were characterized by IR and X-ray diffraction analysis. Complex 1 exhibits a two-dimensional grid structure, whereas complex 2 is a coordination polymer having a one-dimensional linear chain structure. The grid in 1 lies parallel to the crystallographic ab plane and exhibits intra-grid M–M separations of 10.508 × 10.508 Å. Hydrogen bonds hold the cationic chains in 2 together leading to a three-dimensional network structure. 相似文献
10.
Charles N. Myer Christopher W. Allen 《Journal of Inorganic and Organometallic Polymers and Materials》2007,17(1):143-148
The mixed substituent chlorocyclophosphazene monomers 2,2′-N3P3Cl4[O(CH2)4OC(O)C(Me)CH2][C5H5FeC5H4CH2NMe](1) and 2,2′,4-N3P3Cl3[O(CH2)4OC(O)C(Me)CH2][C5H5FeC5 H4CH 2NMe]2 (2) undergo radical addition copolymerization with methylmethacrylate to produce a broad range of copolymers having pendant
cyclophosphazenes containing a ferrocenyl substitutent. In both bulk and solution copolymerization, the conversion decreased
with increasing amount of 1 in the monomer feed with no copolymer formation observed in co-monomer mixtures containing greater than 50% of 1. NMR studies of the copolymers show that the copolymer composition is the same as the monomer feed and that the triad tacticity
is constant throughout the series for 1 but an increase in syndiotactic triads is observed for 2. TGA studies indicate an increase in char yield with an increase in the phosphazene content of the copolymer.
相似文献
Christopher W. AllenEmail: |
11.
A series of cationic surfactants, N-(decyl N-tri-ethanol ammonium Bromide) (C10), N-(dodecyl N-triethanol ammonium Bromide) (C12), N-(hexadecyl N-triethanol ammonium Bromide) (C16) were synthesized. These compounds have been evaluated by studying their surface properties, surface parameters, biodegradability
and antimicrobial and antifungal activities.
相似文献
D. A. IsmailEmail: |
12.
M. S. L. Karuna B. L. A. P. Devi P. S. S. Prasad R. B. N. Prasad 《Journal of surfactants and detergents》2009,12(2):117-123
1-Alkylamino-3-alkyloxy-2-propanols, V (a–g) and N,N-di-(2-hydroxy-3-alkyloxy propyl) alkylamines, VI (a–g) were prepared with the same chain length both for alkyl amino and alkyloxy groups by condensation of alkyl glycidyl ethers
with long chain alkylamines by employing thermal and microwave-assisted methods. All the products were characterized by 1H-NMR, IR and fast atom bombardment mass spectrometry studies. These compounds were further sulfated and evaluated as their
sodium salts for surfactant properties namely surface tension, critical micelle concentration, emulsifying property, wetting,
foaming power and calcium tolerance. Sulfated 1-dodecylamino-3-dodecyloxy-2-propanol, VII c and sulfated N,N-di-(2-hydroxy-3-dodecyloxy propyl) dodecylamine, VIII c were found to exhibit superior surfactant properties among the respective series of monomers and dimers.
相似文献
R. B. N. PrasadEmail: |
13.
A. M. Badawi M. A. Mekawi A. S. Mohamed M. Z. Mohamed M. M. Khowdairy 《Journal of surfactants and detergents》2007,10(4):243-255
In this study, steps were taken toward the development of bactericidal and fungicidal synthetic cationic surfactants by reacting
decyl, dodecyl or tetradecyl amine with acetic or hydrochloric acid to produce a series of amine salts which consequently
converted to copper or cobalt cationic complexes via complexing the first series compounds with copper (II) or cobalt (II)
ions. Surface properties such as interfacial tension and emulsifying power of these surfactants were investigated. The surface
parameters including critical micelle concentration (CMC), maximum surface excess (Γmax) and minimum surface area (A
min) were studied. Free energy of micellization (ΔG°mic) and adsorption (ΔG°ads) were calculated. The antimicrobial activity was determined via the inhibition zone diameter of the prepared compounds, which
measured against five strains of a representative group of microorganisms. FTIR spectra, elemental analysis and H1 NMR spectrum were performed to confirm compound structure and purity.
相似文献
M. Z. MohamedEmail: |
14.
Sangeeta Patil Y. R. Katre Ajaya Kumar Singh 《Journal of surfactants and detergents》2007,10(3):175-184
The kinetics of oxidation of some α-hydroxy acids viz. Tartaric acid (TA) and Malic acid (MA) by N-bromophthalimide (NBP) were studied in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), in perchloric
acid medium at 313 K. The oxidation of TA and MA by N-bromophthalimide in the presence of CTAB is faster than in the absence of surfactant. The rate of oxidation of hydroxy acids
was found to be in the order: TA > MA. First order kinetics with respect to NBP was observed in the oxidation of both hydroxy
acids. The kinetics results indicate that the first order kinetics in hydroxy acids at lower concentrations tends towards
a zero order at its higher concentrations. Inverse fractional order in [H+] and [phthalimide] were noted throughout its tenfold variation. With a progressive increase in [CTAB], the rate of reaction
increased, reaches a maximum value and then constancy in k
Ψ was observed. Variation of [Hg(OAc)2] and ionic strength (μ) of the medium did not bring about any significant change in the rate of reaction. The applicability
of different kinetic models viz. the Piszkiewicz cooperative model, the Raghvan and Srinivasan model, and the Menger–Portnoy
model were tested to explain the observed micellar effects. The effect of [CTAB] on the activation parameters was explored
to rationalize the micellar effect. The values of rate constants observed at four different temperatures were utilized to
calculate the activation parameters. A suitable mechanism consistent with the experimental findings has been proposed. The
index of cooperativity and the micelle binding constant have been calculated.
相似文献
Ajaya Kumar SinghEmail: |
15.
Cuticular hydrocarbons (CHC) and soldier defense secretions (SDS) were characterized for collections of Reticulitermes from six counties (Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Santa Barbara) in southern California.
Collection sites included the type locality for R. hesperus, Lake Arrowhead (formerly known as Little Bear Lake) in the San Bernardino Mountains. In southern California, there are two
CHC phenotypes, SC-A and SC-B, which are easily distinguished by the presence or absence of 5-methyl pentacosane, 5-methyl
heptacosane, 5,17-dimethyl pentacosane, and 5,17-dimethyl heptacosane. These phenotypes are similar, but not identical, to
previously designated phenotypes of Reticulitermes from northern California. The SDS of termites collected from southern California were characterized; (—)-germacrene A was
abundant in all but the four samples from Lake Arrowhead. Soldiers of phenotype SC-A produced >79% germacrene A. The four
samples from Lake Arrowhead produced no germacrene A, but contained >78% γ-cadinene. The SDS from the Lake Arrowhead samples
were more similar to those of CA-A/CA-A′ from northern California than to any of the CHC phenotypes from southern California.
Soldiers of CHC phenotype SC-B produced germacrene A, with the proportion varying from 16.2 to 98.7%. The SDS of SC-B were
more similar to those of SC-A than to any of the phenotypes from northern California. The CHC phenotype SC-A found in southern
California likely represents R. hesperus and SC-B appears to be a new, as yet undescribed species. We discuss the state of current taxonomic research on Reticulitermes.
相似文献
Lori J. NelsonEmail: |
16.
Two series of quaternary cationic surfactant were synthesized by reaction of 8-hydroxyquinoline and 2-hydroxypyridine with
long chain alkyl halides (dodecyl, tetradecyl- and hexadecyl-bromide). Surface tension was measured in aqueous solution for
different concentrations at 25 °C. Various surface properties of the synthesized surfactants were evaluated, particularly
critical micelle concentration (CMC), efficiency (ΠCMC) as well as maximum surface excess (Γmax) and minimum surface area (A
min). Micellization and adsorption in liquid/air interfaces thermodynamics were investigated. The synthesized cationic surfactants
were evaluated for their biocidal activity. All compounds prepared showed good antibacterial and antifungal activities.
相似文献
Dina A. IsmailEmail: |
17.
A series of cleavable aryl sulfonate anionic surfactants were synthesized from cyanuric chloride, aliphatic amine and H-acid
mono sodium salt. Their structures were identified by 1H NMR, Infrared Spectrum (IR) and Elementary Analysis (EA). Their critical micelle concentrations (CMC) in aqueous solutions
at 25 °C were determined by a steady-state fluorescence probe method and a surface-tension method. With the increasing length
of the carbon chain, the value of their CMCs and surface tensions under CMC (γ
CMC) initially decreased and then reached a minimum (respectively 2.63 × 10−5 mol L−1 and 28.29 mN m−1) when the carbon number was 10. The CMC and γ
CMC then increased when the carbon number was increased to 12. The results showed that, compared with sodium dodecyl benzene
sulfonate (SDBS), such kinds of surfactants have much lower surface adsorption amounts and greater molecular areas on the
aqueous surface.
相似文献
Zhiyong HuEmail: |
18.
M. Z. Mohamed 《Journal of surfactants and detergents》2008,11(2):175-179
Four fluorinated cationic surfactants were prepared by condensing 2,2,3,3, tetrafluoro-1-propyl chloroacetate with stoichiometric
amounts of pyridine, 2-hydroxypyridine, 8-hydroxyquinoline and 8-hydroxyquinaldine to produce four quaternary ammonium salts.
The surface and biocidal properties of these surfactants were investigated. Surface properties of their solutions including
surface tension, critical micelle concentration (CMC), effectiveness (Πcmc), maximum surface excess (Γmax) and minimum surface area (A
min) were investigated with respect to different concentrations at 25 °C. Standard free energies of micellization and adsorption
of the prepared surfactants in the aqueous solution were studied. The biocidal activity was determined via the inhibition
zone diameter of prepared compounds which tested against six strains as a representative group of microorganisms.
相似文献
M. Z. MohamedEmail: |
19.
The properties of surfactin-C16 aqueous solution in the presence of Na+ ions, produced by Bacillus subtilis, were studied by the fluorescence method. The critical micelle concentration (CMC) of surfactin-C16 was measured as 24.7 μM in 0.05 M Tris buffer (pH 8.5–8.6). With an increase in Na+ concentration, the CMC value and micropolarity of surfactin-C16 decreased while the microviscosity increased, which means that the addition of Na+ improves the surface activity and enhances the micellization of the surfactin-C16 in solution. The preliminary aggregation number (N) was obtained by the steady-state fluorescence method.
相似文献
Bo-Zhong MuEmail: |
20.
Zhao-sheng Cai Zhan-qian Song Chun-sheng Yang Shi-bin Shang Yan-bai Yin 《Polymer Bulletin》2009,62(4):445-456
N,O-(2-carboxyethyl)chitosan (N,O-2-CEC) was prepared from chitosan with 3-chloropropionic acid as modifying agent and NaOH as catalyst. Different quaternary
ammonium groups were introduced into N,O-2-CEC by the reaction between N,O-2-CEC and different 2,3-epoxypropyl trialkyl ammonium chlorides in the presence of 25% NaOH aqueous solution, and obtained
different quaternized N,O-2-carboxyethyl chitosans (QCECs). Structures of QCECs were characterized by FT-IR, 1HNMR and gel permeation chromatography (GPC). Antimicrobial activity of QCECs was evaluated against a gram-negative bacterium
Escherichia coli and a gram-positive bacterium Staphylococcus aureus. Compared with N,O-2-CEC and quaternized chitosans, the QCECs had much stronger antimicrobial activity, which increased with increasing chain
length of the alkyl in the quaternary ammonium groups. The presence of benzyl in quaternary ammonium groups could endow QCECs
with much better antimicrobial activity. 相似文献