Quantitative Analysis of Dye Decolourization Reactions in Mixed Micellar Systems of Sodium Dodecyl Sulfate with Tween-20, Tween-80, and Triton X-100

2012 ◽  
Vol 65 (2) ◽  
pp. 153 ◽  
Author(s):  
Kimkholhing Lunkim ◽  
M. Niraj Luwang ◽  
Sri K. Srivastava
Keyword(s):  
Quantitative Analysis ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Tween 80 ◽  
Inhibitory Effect ◽  
Reaction Rate Constant ◽  
Tween 20 ◽  
Sds Micelles ◽  
Hydroxyl Ion ◽  
Dodecyl Sulfate

The reaction of triphenylmethane dye (ethyl violet) with hydroxyl ion has been investigated in absence and presence of micelles. In micellar solutions, the solubilization of dye carbocation is observed. The reaction rate constant follows pseudo-first order kinetics with respect to the nucleophile. In presence of sodium dodecyl sulfate (SDS) micelles, an inhibitory effect is observed due to repulsion of the nucleophile to the strongly bound dye carbocation in the negatively charged SDS aggregate. The presence of nonionic surfactant reduces the inhibitory effect of the anionic SDS micelles. Quantitative analysis of the micellar data obtained has been done by applying a positive cooperativity model of enzyme catalysis. The value of n (index of cooperativity) has been found to be greater than 1 for all systems under study. The presence of solvents such as ethanol, n-propanol, and n-butanol reduces the inhibitory effect of the micelles.

scholarly journals Conductometric study of sodium dodecyl sulfate - nonionic surfactant (Triton X-100, Tween 20, Tween 60, Tween 80 or Tween 85) mixed micelles in aqueous solution

2012 ◽  
Vol 66 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Dejan Cirin ◽  
Mihalj Posa ◽  
Veljko Krstonosic ◽  
Maja Milanovic
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Synergistic Effect ◽  
Nonionic Surfactants ◽  
Mixed Micelles ◽  
Sodium Dodecyl ◽  
Tween 80 ◽  
Tween 20 ◽  
Dodecyl Sulfate ◽  
Tween 60 ◽  
Triton X

The present study is concerned with the determination of the critical micelle concentration (cmc) of mixed micelles of sodium dodecyl sulfate with one of five nonionic surfactants (Triton X-100, Tween 20, Tween 60, Tween 80 or Tween 85) from conductance measurements. Based on the calculated values of the ? parameters we have noticed that SDS-nonionic surfactants mostly showed strong synergistic effect. It was found that nonionic surfactants with mainly longer and more hydrophobic tail show stronger interactions with hydrophobic part of SDS, thus expressing stronger synergism. In SDS-Tween 80 binary system the strongest synergistic effect was noticed. SDS-Tween 85 micellar system showed antagonistic effect, most probably because the presence of the double bond in its three hydrophobic tails (three C18 tails) makes it sterically rigid.

Hurdle Effect of Hot Air Impingement Drying and Surfactant-Sanitizer Wash on Removal of Listeria innocua from Fresh Apples

2020 ◽  
Vol 83 (9) ◽  
pp. 1488-1494 ◽  
Author(s):  
EWA PIETRYSIAK ◽  
JULIANNE M. KUMMER ◽  
INES HANRAHAN ◽  
GIRISH M. GANJYAL
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Evaporation Rate ◽  
Sodium Dodecyl ◽  
Listeria Innocua ◽  
Tween 20 ◽  
Log Reduction ◽  
Hot Air ◽  
Lauric Arginate ◽  
Dodecyl Sulfate ◽  
Air Impingement

ABSTRACT This study investigated the decontamination efficacy of washing treatments for whole fresh apples by using washes containing surfactants, lauric arginate, sodium dodecyl sulfate, and Tween 20, combined with peracetic acid (PAA), followed by hot air impingement drying. Whole fresh apples of selected varieties (Gala and Granny Smith) were inoculated with Listeria innocua (7 log CFU/mL) by using a dipping method, and then dried and subjected to wash treatments with selected washing solutions (H2O, PAA, PAA–lauric arginate, PAA–sodium dodecyl sulfate, and PAA–Tween 20), followed by hot air impingement drying at two different temperature and time conditions, 93°C for 60 s or 121°C for 25 s. The H2O and PAA wash followed by hot air impingement drying led to a maximum 1.5-log reduction of L. innocua on the fruit surface. Adding surfactants increased the effectiveness of washing and drying treatments, resulting in an approximate 2.2-log reduction. Surfactants increased the spreadability and evaporation rate of the washing solutions. Posttreatment changes in apple firmness were assessed during a 21-day storage at 4 and 21°C. The hot air impingement drying had no adverse effect on the firmness of the apples and did not show any further reduction in L. innocua. Washing apples with solutions containing surfactants combined with PAA followed by hot air impingement drying helped to reduce the microbial loads to some extent and may help to reduce drying times significantly. HIGHLIGHTS

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