Micelle formation by ionic surfactants. II. Specificity of head groups, micelle structure

1974 ◽  
Vol 78 (24) ◽  
pp. 2480-2485 ◽  
Author(s):  
Dirk Stigter
Keyword(s):  
Micelle Formation ◽  
Ionic Surfactants ◽  
Micelle Structure ◽  
Head Groups

Structure of the casein micelle. A proposed model

1970 ◽  
Vol 37 (3) ◽  
pp. 493-505 ◽  
Author(s):  
J. Garnier ◽  
B. Ribadeau Dumas
Keyword(s):  
Quaternary Structure ◽  
Micelle Formation ◽  
Scale Model ◽  
Casein Micelle ◽  
Covalent Bonds ◽  
3 Dimensional ◽  
Micelle Structure ◽  
Dimensional Network ◽  
Proposed Model ◽  
New Type

SummaryOn the basis of complete permeability by high molecular weight reagents of casein micelles in milk and a uniform distribution of the 3 different casein subunits, a model of the micelle structure is proposed. It is composed of an average repeating unit of 1 κ-, 2 αs1;- and β-casein subunits assembled in a 3-dimensional network or branched polymer made of 130–130000 monomers, in which the trimers of κ-casein occupy the nodes and the copolymers of αs1;- and β-caseins make up the branches. All the associations between subunits are through non-covalent bonds. The chemical composition varies with the number of αs1;- and β;-casein subunits in the branches. This proposed structure is strongly supported by evidence from electron microscopy and a scale model has been made. It leads to an understanding of the role of κ-casein in micelle formation and opens new perspectives in explaining some properties of the caseins. It offers an interesting example of a new type of quaternary structure of protein subunits.

IMPACT OF LIPASE ON MICELLE FORMATION AND SOLUBILIZATION ABILITIES OF NON-IONIC SURFACTANTS

2018 ◽  
Vol 61 (6) ◽  
pp. 54
Author(s):  
Regina A. Smith ◽  
Elena Yu. Demyantseva ◽  
Ol’ga S. Andranovich
Keyword(s):  
Surface Activity ◽  
Micelle Formation ◽  
Enzyme Concentration ◽  
Ionic Surfactants ◽  
Ionic Surfactant ◽  
Paper Mills ◽  
Mixed Aggregates ◽  
Experimental Surface ◽  
Solubilizing Capacity ◽  
Hydrophobic Areas

Biotechnology is one of the fastest growing sector of scientific and applied activities of the humans, which needs to be successfully integrated into existing technologies. Such upcoming trend is the combination of conventional pulp treatment by surfactants and enzymatic processing in order to prevent pitch troubles in the pulp and paper mills. This article presents the research results of the abilities of non-ionic surfactants (sintamid-5, sintanol DS-10), enzyme (lipase) and their syner-gistic combinations to the micelle formation and solubilization. We chose the optimal synergistic compositions and investigated their colloid-chemical characteristics. There is no effect to the micelle formation ability of surfactants when addition of lipase is up to 30%. The largest deviation from the additive values of surface activity was observed for the mixture of individual non-ionic surfactant and lipase at the ratio of 70:30. However, in the all mixtures of both surfactants and lipase the ratio of experimental surface activity to the theoretically calculated is less than one. It looks, that hydrophilic areas of mixed aggregates block hydrophobic areas of lipase thereby preventing adsorption of lipase at the interface. A predominance of the surfactant in the composition will reduce its cost. The maximum of solubilizing capacity has sintanol DS-10 due to its highest HLB and the lowest CMC that leads to more micelles amount in solution and higher total hydrocarbon volume. The pitch solubilization in lipase solutions does not depend on enzyme concentration. The high pitch dissolving in synergistic mixture of sintanol DS-10 and lipase is observed. It is predetermines the usage of such systems for cellulose deresination.For citation:Smith R.A., Demyantseva E.Yu. Andranovich, O.S. Impact of lipase on micelle formation and solubilization abilities of non-ionic surfactants. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 6. P. 54-60

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