Effect of rare earth cations on bactericidal activity of anionic surfactants

Berg, Ronald W.; Zimmerer, R. E.

doi:10.1007/bf01569335

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…In contrast , anionic surfactants are rarely used as bactericidal agents because of their lower effectiveness against gram-negative bacteria (Dychdala and Lopes, 1991). However, it has been known that the activity of anionic surfactants definitely increases in the lower pH range and in the presence of polyvalent metal cations (Berg et al, 1987;Dychdala and Lopes, 1991;Voss, 1963) . In a previous study (Kihara et al ., 1996) , we also found that sodium 1-octanesulfonate (C8H,7S03 Na, NaOS), an anionic surfactant, was remarkably effective against E. col/ in the presence of only a few polyvalent cations and their effectiveness increased in the order of monovalent<divalent<<trivalent cation .…”

Section: Introductionmentioning

confidence: 99%

Synergistic Bactericidal Activity in Binary Mixtures of an Anionic Surfactant and Polyvalent Metal Ions.

1997

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The bactericidal activity of the mixed solutions of sodium 1-octanesulfonate (NaOS) and metal ions (Na+, Mg2+, Al3+, La3+) against Escherichia coil ATCC 25922 and the leakage of intracellular materials from the organism treated with the mixtures were studied by a quantitative suspension test and turbidimetry, respectively . When the total concentrations of the systems were kept constant, a maximum in bactericidal activity was found in the vicinity of the molar ratio of 2 : 1 for NaOS/divalent cations and 3 : 1 for NaOS/trivalent cations . Monovalent cations were ineffective at the concentrations tested. In the case of NaOS/LaCl3 , the absorbance at260 nm (A260) also showed a maximum when plotted against the LaCl3 mole fraction . This mole fraction at the maximum was almost similar to that of the maximum bactericidal activity . The interaction between NaOS and metal cations for the mixture systems was examined by a measurement of surface tension. The surface tension was found to be the lowest at a molar ratio similar to the results observed in the bactericidal test . This lowering of the surface tension seemed to be caused by a strong interaction between NaOS and polyvalent metal cations . These results suggest that the synergistic bactericidal activity in NaOS/polyvalent metal ion mixtures is closely associated with a hydrophobic complex formed between a I -octanesulfonicanion and a polyvalent cation, and with the disorganization of the cell membrane caused by that formation.

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Section: Introductionmentioning

confidence: 99%

Synergistic Bactericidal Activity in Binary Mixtures of an Anionic Surfactant and Polyvalent Metal Ions.

1997

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“…The antibacterial activity of anionic surfactants is lower than that of cationic surfactants. However, it is documented that the lowering of pH and the addition of divalent and rare earth cations potentiate the activity of anionic surfactants (Berg and Zimmerer, 1987;Dychdala and Lopes, 1991;Voss, 1963 ) . In studying the effect of cations, especially polyvalent metal cations, on the bactericidal activity of anionic surfactants, it is desired that test solutions are homogenous without giving rise to precipitation and aggregation in order to simplify the interpretation of experimental results.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Adsorption of an Anionic Surfactant onto a Synthetic Lipid Membrane and its Bactericidal Activity in the Presence of Metal Ions.

1997

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The relationship between the adsorption behavior of an anionic surfactant , sodium 1octanesulfonate, onto a synthetic lipid membrane and its bactericidal activity against Escherichia coli ATCC 25922 in the presence of various cations was studied. The amounts of the sulfonate/cation mixtures adsorbed were estimated by observing frequency changes of a membrane-coated quartz-crystal microbalance. Among all cations tested, trivalent cations most effectively promoted the adsorption of the surfactant onto the membrane. Divalent cations were also effective, but substantially less so than trivalent cations. The adsorption behavior of the surfactant/cation mixtures onto the membrane was closely related to the bactericidal activity of their mixtures against E. coli.

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Mould phytases and their application in the food industry

Zyta

1992

World J Microbiol Biotechnol

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The nutritional implications of the presence of phytates in certain food products are described. Several techniques for phytate removal or conversion in foods are discussed, with special emphasis on enzymic conversion. The application of mould phytases for the dephosphorylation of phytate compounds is evaluated with respect to legume products, breadmaking, chicken diets and corn wet milling. The properties of different phytases are summarized and data concerning biosynthesis of phytate-degrading enzymes are also analysed.

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Effect of rare earth cations on bactericidal activity of anionic surfactants

Cited by 4 publications

References 9 publications

Synergistic Bactericidal Activity in Binary Mixtures of an Anionic Surfactant and Polyvalent Metal Ions.

Synergistic Bactericidal Activity in Binary Mixtures of an Anionic Surfactant and Polyvalent Metal Ions.

Relationship between Adsorption of an Anionic Surfactant onto a Synthetic Lipid Membrane and its Bactericidal Activity in the Presence of Metal Ions.

Mould phytases and their application in the food industry

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