- Supramolecular effects on the antifungal activity of cyclodextrin/di-n- decyldimethylammonium chloride mixtures
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Candidiasis infections are growing problem worldwide especially for the immunocompromised individuals. Di-n-decyldimethylammonium chloride is one of the most common antifungal agents used to clean medical devices. The current study examines the antifungal mechanism of di-n-decyldimethylammonium cation and its cyclodextrin inclusion complexes. Depending on the type of cyclodextrin (α-, β- or γ-CD), inclusion complexes can be as active as ammonium alone in terms of microorganism death (fungicidal activity). Moreover, with β-CD inclusion complexes, synergism is observed against fungus growth (fungistatic activity). Based on molecular dynamics, we propose a mechanism supported by cell number, selective electrode and ζ-potential measurements as a function of time. The mechanism involves four steps: (i) the positively-charged complex diffuses through the solution, (ii) it adsorbs onto the fungus membrane surface by electrostatic interaction, (iii) then it dissociates and the ammonium inserts in the microorganism membrane, and (iv) the change of the cell surface charge induces cell lysis.
- Leclercq, Lo?c,Lubart, Quentin,Dewilde, Anny,Aubry, Jean-Marie,Nardello-Rataj, Véronique
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- Synthesis process of dialkyl dimethyl ammonium chloride
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The invention discloses a synthesis process of dialkyl dimethyl ammonium halide, which comprises the following steps: mixing primary alkyl halide R1X and long-chain alkyl dimethylamine R2(CH3)2N, heating to 130-150 DEG C in a closed container, keeping the temperature to react for 4-6 hours, cooling, and diluting with an ethanol water solution to obtain dialkyl dimethyl ammonium halide, wherein thereaction temperature is determined by the number of carbon atoms of R1 and R2, and the formula is 130 DEG C+2.5(CR1+CR216)DEG C. Primary alkyl halide and long-chain alkyl dimethylamine directly reactto generate dialkyl dimethyl ammonium halide, so that the use of flammable and combustible gaseous raw materials is avoided, and the production safety is improved, the production process flow and equipment are simple, the production cost is low, industrial popularization is facilitated, no acid or salt byproduct is generated, and the product is high in purity, free of three wastes and environmentally friendly.
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Paragraph 0022
(2021/03/11)
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- Supramolecular assistance between cyclodextrins and didecyldimethylammonium chloride against enveloped viruses: Toward eco-biocidal formulations
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Nosocomial infections have emerged as important causes of morbidity and mortality in immunocompromised individuals. In this respect, biocides are widely used in hospitals leading to resistant microorganisms. We show here that cyclodextrins can remarkably boost the virucidal activity of di-n-decyldimethylammonium chloride. These oligosaccharides synergistically work with the biocide affording a noticeable reduction of the active virucide concentration between 40 and 85%. Partial replacement of a significant amount of the biocide by eco- and bio-compatible cyclodextrins whilst maintaining the same activity is of great interest as it allows the reduction of the toxicological drawbacks of classical biocide mixtures.
- Leclercq, Lo?c,Dewilde, Anny,Aubry, Jean-Marie,Nardello-Rataj, Véronique
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p. 273 - 281
(2016/09/07)
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- STABLE COMPOSITIONS OF THIABENDAZOLE AND IODINE-CONTAINING FUNGICIDES
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The present invention relates to stable compositions for the fungicidal equipment of thermoplastic polymers, in particular PVC, comprising thiabendazole, at least one iodine-containing fungicide and at least one epoxide and optionally further fungicidally active compounds, and also to methods for preparing these formulations and to uses thereof for the protection of thermoplastic polymers against attack and destruction by microorganisms. Moreover, the invention relates to mold-resistant PVC materials equipped with the compositions according to the invention.
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- Modeling of multiple equilibria in the self-aggregation of di- n -decyldimethylammonium chloride/octaethylene glycol monododecyl ether/cyclodextrin ternary systems
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The surface tension equations of binary surfactant mixtures (di-n-decyldimethylammonium chloride and octaethylene glycol monododecyl ether) are established by combining the Szyszkowski equation of surfactant solutions, the ideal or nonideal mixing theory, and the phase separation model. For surfactant mixtures, the surface tension at the air-water interface is calculated using nonideal theory due to synergism between the two adsorbed surfactant types. The incorporation of cyclodextrin complexation model to the surface tension equations gives a robust model for the description of the surface tension isotherms of binary, ternary, and more complex systems involving numerous inclusion complexes. The surface tension data obtained experimentally shows excellent agreement with the theoretical model below and above the formation of micelles. The strong synergistic effect observed between the two surfactants is disrupted by the presence of CDs, leading to ideal behavior of ternary systems. Indeed, depending on the nature of the cyclodextrin (i.e., α, β, or γ), which allows a tuning of the cavity size, the binding constants with the surfactants are modified as well as the surface properties due to strong modification of equilibria involved in the ternary mixture.
- Leclercq, Loic,Lubart, Quentin,Aubry, Jean-Marie,Nardello-Rataj, Veronique
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p. 6242 - 6252
(2013/07/27)
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- METHOD FOR THE SYNTHESIS OF QUATERNARY AMMONIUM COMPOUNDS AND COMPOSITIONS THEREOF
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A novel manufacturing process is described for producing quaternary ammonium compounds having a selected anion, which may be useful in wood preservative formulations. The process involves reacting a trialkylamine with an alkyl bromide to form a quaternary tetraalkylammonium bromide salt, converting the quaternary tetraalkylammonium bromide salt to a quaternary tetraalkylammonium hydroxide salt by using an ion exchange resin, and converting the quaternary tetraalkylammonium hydroxide salt to the quaternary tetraalkylammonium salt of the selected anion.
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Page/Page column 49-50; 58-59
(2008/06/13)
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- Synergetic biocidal composition comprising 2-methylisothiazoline-3-on
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The invention relates to a biocidal composition which can be added to materials which can be attacked by harmful micro-organisms. The composition comprises 2-methylisothiazoline-3-on as biocidal active ingredient and at least one other biocidal active ingredient. The biocidal composition is characterised in that the composition contains formaldehyde or a formaldehyde-depot material, 2-brom-2-nitro-1,3 propandiol, polyhexamethylene biguanide, o-phenylphenol, pyrithione, n-butyl-1,2-benzisothiazoline-3-on, n-hydroxymenthyl-1,2-benzisothiazoline-3-on or benzalkonium chloride as said other biocidal active ingredient.
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- 3-NITROISOXAZOLES AND THEIR USE IN THE PROTECTION OF MATERIALS
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The 3-nitroisoxazoles of the formula (I) in which R1 and R2 are each as defined in the description, some of which are known, are highly suitable for use as biocides for protecting industrial materials.
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- O-aryl dithiazole dioxides
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The invention relates to new O-aryldithiazole dioxides, to two processes for their preparation, and to their use as pesticides in crop protection and in the protection of materials.
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- Synergistic biocide composition
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A biocide composition is provided as an addition to substances that can be infected by harmful microorganisms, in which the biocide composition has at least two active biocidal substances, one of which is 2-methylisothiazolin-3-one. The composition is characterized in that it contains 1,2-benzisothiazolin-3-one, compositions containing 5-chloro-2-methylisothiazolin-3-one being excluded. In comparison with its individual components, the composition of the invention has a synergistic biocidal activity.
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- Arylthio-dithiazindioxides and their use as pesticides
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PCT No. PCT/EP97/07242 Sec. 371 Date Jun. 23, 1999 Sec. 102(e) Date Jun. 23, 1999 PCT Filed Dec. 22, 1997 PCT Pub. No. WO98/29400 PCT Pub. Date Jul. 9, 1998The invention relates to novel S-aryl-dithiazine dioxides, to processes for their preparation and to the use in crop protection and in the protection of materials.
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- Ultrasonic Relaxation and Carbon-13 NMR Studies of Dialkylammonium Chloride Micelles
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Ther cmc values of several dialkylmethyl and dialkyldimethylammonium chloride surfactants, with a number of carbon atoms per alkyl chain, nc, between 6 and 12, have been measured by conductivity and ultrasonic absorption techniques.The results agree with earlier cmc measurements for dialkyldimethylammonium chlorides with nc equal to 8, 10, and 12.The aggregation number of dihexylmethylammonium chloride has been determined by 13C NMR.The value of 6 has been found, which is in good agreement with the values obtained for monoalkyl chain surfactants.The kinetic study of the fast exchange process occurring in micellar solutions has been carried out by means of ultrasonic absorption methods on aqueous solutions of dialkylmethylammonium chlorides with 6, 7, and 8 carbon atoms in each alkyl chain.The relaxation time τ1 which characterizes this fast process increases as the alkyl chain length increases as for monoalkyl surfactants.The τ1 values are much closer to those found for straight-chain surfactants with 6, 7, and 8 carbon atoms than those found for straight-chain surfactants with 12, 14, and 16 carbon atoms.The kinetic results are discussed in terms of Aniansson and Wall's theory.
- Lang, Jacques
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p. 992 - 998
(2007/10/02)
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